<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2024 Workiva-->
<!--r:5cd78ee1-b5f2-40af-9748-7f6eb7d0f6f6,g:cc32efb7-aa6b-4fa9-99c1-0d00c052094c-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/ConsolidatedStatementsofIncome" xlink:type="simple" xlink:href="wynn-20231231.xsd#ConsolidatedStatementsofIncome"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/ConsolidatedStatementsofIncome" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_66ec8d52-35b1-4a81-be47-45a7a3394e6b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_2f7abd52-ed55-4c63-bdfc-14e92f5845e7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_66ec8d52-35b1-4a81-be47-45a7a3394e6b" xlink:to="loc_us-gaap_StatementTable_2f7abd52-ed55-4c63-bdfc-14e92f5845e7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_f830f4e7-9d8f-428b-8c4c-981821b39c84" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_2f7abd52-ed55-4c63-bdfc-14e92f5845e7" xlink:to="loc_srt_ProductOrServiceAxis_f830f4e7-9d8f-428b-8c4c-981821b39c84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_f830f4e7-9d8f-428b-8c4c-981821b39c84_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_f830f4e7-9d8f-428b-8c4c-981821b39c84" xlink:to="loc_srt_ProductsAndServicesDomain_f830f4e7-9d8f-428b-8c4c-981821b39c84_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_2059f174-dd9b-41cc-a976-27e572cc7905" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_f830f4e7-9d8f-428b-8c4c-981821b39c84" xlink:to="loc_srt_ProductsAndServicesDomain_2059f174-dd9b-41cc-a976-27e572cc7905" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CasinoMember_5b7af15e-b71b-4cc8-91a0-3395da8d2b50" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CasinoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_2059f174-dd9b-41cc-a976-27e572cc7905" xlink:to="loc_us-gaap_CasinoMember_5b7af15e-b71b-4cc8-91a0-3395da8d2b50" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OccupancyMember_1ad3f05d-ef26-4589-8789-ac27f6aa539e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OccupancyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_2059f174-dd9b-41cc-a976-27e572cc7905" xlink:to="loc_us-gaap_OccupancyMember_1ad3f05d-ef26-4589-8789-ac27f6aa539e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FoodAndBeverageMember_71f690cd-68f8-4125-b45d-3d72c5b43891" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FoodAndBeverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_2059f174-dd9b-41cc-a976-27e572cc7905" xlink:to="loc_us-gaap_FoodAndBeverageMember_71f690cd-68f8-4125-b45d-3d72c5b43891" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_EntertainmentRetailAndOtherMember_8d6ccf63-3060-4419-a2c8-650d9dde4c02" xlink:href="wynn-20231231.xsd#wynn_EntertainmentRetailAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_2059f174-dd9b-41cc-a976-27e572cc7905" xlink:to="loc_wynn_EntertainmentRetailAndOtherMember_8d6ccf63-3060-4419-a2c8-650d9dde4c02" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_68b5479e-4e42-4502-a723-19e5c7e191ec" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_66ec8d52-35b1-4a81-be47-45a7a3394e6b" xlink:to="loc_us-gaap_RevenuesAbstract_68b5479e-4e42-4502-a723-19e5c7e191ec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_be354d40-d610-4482-92d7-6fdce967ee17" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_68b5479e-4e42-4502-a723-19e5c7e191ec" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_be354d40-d610-4482-92d7-6fdce967ee17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpensesAbstract_04281526-9d2d-41f2-955c-e376d8df0127" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CostsAndExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_66ec8d52-35b1-4a81-be47-45a7a3394e6b" xlink:to="loc_us-gaap_CostsAndExpensesAbstract_04281526-9d2d-41f2-955c-e376d8df0127" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_97b952e0-c669-43da-8abe-2e3e51df8a3a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_04281526-9d2d-41f2-955c-e376d8df0127" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_97b952e0-c669-43da-8abe-2e3e51df8a3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_e72bc9bc-a31b-4172-a593-d938e74d4bcb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_04281526-9d2d-41f2-955c-e376d8df0127" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_e72bc9bc-a31b-4172-a593-d938e74d4bcb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_bd59ce5a-6f4a-4db6-adf1-487f3ff4ed24" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProvisionForDoubtfulAccounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_04281526-9d2d-41f2-955c-e376d8df0127" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_bd59ce5a-6f4a-4db6-adf1-487f3ff4ed24" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreOpeningCosts_df9891e2-a5ed-4a2b-aee8-0711578643b4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreOpeningCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_04281526-9d2d-41f2-955c-e376d8df0127" xlink:to="loc_us-gaap_PreOpeningCosts_df9891e2-a5ed-4a2b-aee8-0711578643b4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_13ff502d-ea52-4e5a-b3a1-757b4e6e43b6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_04281526-9d2d-41f2-955c-e376d8df0127" xlink:to="loc_us-gaap_DepreciationAndAmortization_13ff502d-ea52-4e5a-b3a1-757b4e6e43b6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleAndLeasebackTransactionGainLossNet_036e2cd7-881b-4d9c-b6dd-da5a725d738f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SaleAndLeasebackTransactionGainLossNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_04281526-9d2d-41f2-955c-e376d8df0127" xlink:to="loc_us-gaap_SaleAndLeasebackTransactionGainLossNet_036e2cd7-881b-4d9c-b6dd-da5a725d738f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetImpairment_f26b3c6c-9cd1-4cac-aba9-6e9dead10655" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillAndIntangibleAssetImpairment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_04281526-9d2d-41f2-955c-e376d8df0127" xlink:to="loc_us-gaap_GoodwillAndIntangibleAssetImpairment_f26b3c6c-9cd1-4cac-aba9-6e9dead10655" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_ProjectAbandonmentCosts_49b4f94b-c3ca-436f-9510-5f2650f90780" xlink:href="wynn-20231231.xsd#wynn_ProjectAbandonmentCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_04281526-9d2d-41f2-955c-e376d8df0127" xlink:to="loc_wynn_ProjectAbandonmentCosts_49b4f94b-c3ca-436f-9510-5f2650f90780" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_16cd5043-26a2-4555-9a58-9cf0d6652ea1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CostsAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_04281526-9d2d-41f2-955c-e376d8df0127" xlink:to="loc_us-gaap_CostsAndExpenses_16cd5043-26a2-4555-9a58-9cf0d6652ea1" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_7ae2ddfc-94bb-4da3-bfe4-442e17584dac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_66ec8d52-35b1-4a81-be47-45a7a3394e6b" xlink:to="loc_us-gaap_OperatingIncomeLoss_7ae2ddfc-94bb-4da3-bfe4-442e17584dac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpenseAbstract_4df57540-04e3-4452-add8-22e2cf31b958" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NonoperatingIncomeExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_66ec8d52-35b1-4a81-be47-45a7a3394e6b" xlink:to="loc_us-gaap_NonoperatingIncomeExpenseAbstract_4df57540-04e3-4452-add8-22e2cf31b958" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInterest_b21b9508-ec94-4838-8b69-2565c0f503f4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InvestmentIncomeInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_4df57540-04e3-4452-add8-22e2cf31b958" xlink:to="loc_us-gaap_InvestmentIncomeInterest_b21b9508-ec94-4838-8b69-2565c0f503f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_21901c0e-2edc-4681-97f4-d30e0de62fb2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_4df57540-04e3-4452-add8-22e2cf31b958" xlink:to="loc_us-gaap_InterestExpense_21901c0e-2edc-4681-97f4-d30e0de62fb2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_1da631d5-fb7f-4526-9e5a-bac457dd8255" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainLossOnDerivativeInstrumentsNetPretax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_4df57540-04e3-4452-add8-22e2cf31b958" xlink:to="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_1da631d5-fb7f-4526-9e5a-bac457dd8255" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_35b3636f-7446-46b4-bb76-2219ced4ff79" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_4df57540-04e3-4452-add8-22e2cf31b958" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_35b3636f-7446-46b4-bb76-2219ced4ff79" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_53323da9-540e-4d8a-bfb4-e9f38b5fd5fd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_4df57540-04e3-4452-add8-22e2cf31b958" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_53323da9-540e-4d8a-bfb4-e9f38b5fd5fd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_78795590-a0f8-46cb-a594-820d8a61435b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_4df57540-04e3-4452-add8-22e2cf31b958" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_78795590-a0f8-46cb-a594-820d8a61435b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_e73030b7-8539-4035-9d6f-2802c6d03f85" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_66ec8d52-35b1-4a81-be47-45a7a3394e6b" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_e73030b7-8539-4035-9d6f-2802c6d03f85" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_517d596f-7f64-4e2b-afc3-516aaed76a3d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_66ec8d52-35b1-4a81-be47-45a7a3394e6b" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_517d596f-7f64-4e2b-afc3-516aaed76a3d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_f959b7b0-3597-46a1-b516-30c282e8f9fb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_66ec8d52-35b1-4a81-be47-45a7a3394e6b" xlink:to="loc_us-gaap_ProfitLoss_f959b7b0-3597-46a1-b516-30c282e8f9fb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_0bc7bd28-90c2-47f0-ad1f-4a1fdd80b63c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_66ec8d52-35b1-4a81-be47-45a7a3394e6b" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_0bc7bd28-90c2-47f0-ad1f-4a1fdd80b63c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_3a0262e4-c370-4bc9-89cc-2bcbee470975" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_66ec8d52-35b1-4a81-be47-45a7a3394e6b" xlink:to="loc_us-gaap_NetIncomeLoss_3a0262e4-c370-4bc9-89cc-2bcbee470975" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_EarningsPerShareBasicAndDilutedEPSAbstract_d94ab7d5-babd-43f4-a8b4-0c5ad14aa0f5" xlink:href="wynn-20231231.xsd#wynn_EarningsPerShareBasicAndDilutedEPSAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_66ec8d52-35b1-4a81-be47-45a7a3394e6b" xlink:to="loc_wynn_EarningsPerShareBasicAndDilutedEPSAbstract_d94ab7d5-babd-43f4-a8b4-0c5ad14aa0f5" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_0b137ba6-3952-4fd9-b1ad-8ddac5db17de" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_EarningsPerShareBasicAndDilutedEPSAbstract_d94ab7d5-babd-43f4-a8b4-0c5ad14aa0f5" xlink:to="loc_us-gaap_EarningsPerShareAbstract_0b137ba6-3952-4fd9-b1ad-8ddac5db17de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_76541aa2-c0c5-47a1-bfe1-55b926178c14" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_0b137ba6-3952-4fd9-b1ad-8ddac5db17de" xlink:to="loc_us-gaap_EarningsPerShareBasic_76541aa2-c0c5-47a1-bfe1-55b926178c14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_bf947e82-03b6-41b7-b703-d3b4e5bb6908" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_0b137ba6-3952-4fd9-b1ad-8ddac5db17de" xlink:to="loc_us-gaap_EarningsPerShareDiluted_bf947e82-03b6-41b7-b703-d3b4e5bb6908" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_1c1d3cf3-bbfb-417c-ae20-0a4de2fd42dd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_EarningsPerShareBasicAndDilutedEPSAbstract_d94ab7d5-babd-43f4-a8b4-0c5ad14aa0f5" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_1c1d3cf3-bbfb-417c-ae20-0a4de2fd42dd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_57d7c84e-833a-4db5-adc0-d56680814a94" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_1c1d3cf3-bbfb-417c-ae20-0a4de2fd42dd" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_57d7c84e-833a-4db5-adc0-d56680814a94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_d040fa95-5cb2-4d67-8a45-61c7d77e53be" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_1c1d3cf3-bbfb-417c-ae20-0a4de2fd42dd" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_d040fa95-5cb2-4d67-8a45-61c7d77e53be" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/ConsolidatedStatementsofStockholdersEquityDeficit" xlink:type="simple" xlink:href="wynn-20231231.xsd#ConsolidatedStatementsofStockholdersEquityDeficit"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/ConsolidatedStatementsofStockholdersEquityDeficit" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_387cc8fd-11e9-47eb-8e49-7e2f9daa6609" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_8627b07b-7870-4766-9f7c-d83fcd43e840" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_387cc8fd-11e9-47eb-8e49-7e2f9daa6609" xlink:to="loc_us-gaap_StatementTable_8627b07b-7870-4766-9f7c-d83fcd43e840" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_dabc4256-f2ee-42eb-aee6-fdc1498f87e7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_8627b07b-7870-4766-9f7c-d83fcd43e840" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_dabc4256-f2ee-42eb-aee6-fdc1498f87e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_dabc4256-f2ee-42eb-aee6-fdc1498f87e7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_dabc4256-f2ee-42eb-aee6-fdc1498f87e7" xlink:to="loc_us-gaap_EquityComponentDomain_dabc4256-f2ee-42eb-aee6-fdc1498f87e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_0aff6940-bd15-48d7-b929-b9ecc06d5f41" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_dabc4256-f2ee-42eb-aee6-fdc1498f87e7" xlink:to="loc_us-gaap_EquityComponentDomain_0aff6940-bd15-48d7-b929-b9ecc06d5f41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParentMember_73d7464a-c080-4d88-bf49-224175acdc16" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_0aff6940-bd15-48d7-b929-b9ecc06d5f41" xlink:to="loc_us-gaap_ParentMember_73d7464a-c080-4d88-bf49-224175acdc16" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_c25c1c8e-1499-4347-aade-3a81673eec7d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_73d7464a-c080-4d88-bf49-224175acdc16" xlink:to="loc_us-gaap_CommonStockMember_c25c1c8e-1499-4347-aade-3a81673eec7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_12669cd2-cbea-4c4b-b8d9-fb915af363c2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_73d7464a-c080-4d88-bf49-224175acdc16" xlink:to="loc_us-gaap_TreasuryStockCommonMember_12669cd2-cbea-4c4b-b8d9-fb915af363c2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_334b1159-e817-41ac-bdf0-53f0ce03be5c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_73d7464a-c080-4d88-bf49-224175acdc16" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_334b1159-e817-41ac-bdf0-53f0ce03be5c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_45211ffb-fdd4-4a8d-b3f4-a8d9e0008374" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_73d7464a-c080-4d88-bf49-224175acdc16" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_45211ffb-fdd4-4a8d-b3f4-a8d9e0008374" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_65a6aade-6635-45a4-8048-4835efa50ff8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_73d7464a-c080-4d88-bf49-224175acdc16" xlink:to="loc_us-gaap_RetainedEarningsMember_65a6aade-6635-45a4-8048-4835efa50ff8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_903c6ae3-44cc-4fd2-922b-5ce7536f7ccf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_0aff6940-bd15-48d7-b929-b9ecc06d5f41" xlink:to="loc_us-gaap_NoncontrollingInterestMember_903c6ae3-44cc-4fd2-922b-5ce7536f7ccf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_8f8856b6-0933-4d35-97bb-6ed79807fcd5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_387cc8fd-11e9-47eb-8e49-7e2f9daa6609" xlink:to="loc_us-gaap_SharesOutstanding_8f8856b6-0933-4d35-97bb-6ed79807fcd5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_3a296547-3816-425c-9990-b2cc396503b9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_387cc8fd-11e9-47eb-8e49-7e2f9daa6609" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_3a296547-3816-425c-9990-b2cc396503b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_1d9cb627-d4ee-4c56-bb59-b66b20d155ba" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_387cc8fd-11e9-47eb-8e49-7e2f9daa6609" xlink:to="loc_us-gaap_ProfitLoss_1d9cb627-d4ee-4c56-bb59-b66b20d155ba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_52e46a38-34be-48fc-97a1-7cd1321b7d77" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_387cc8fd-11e9-47eb-8e49-7e2f9daa6609" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_52e46a38-34be-48fc-97a1-7cd1321b7d77" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_f275aad3-60d8-4938-86cb-4a2932797707" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_387cc8fd-11e9-47eb-8e49-7e2f9daa6609" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_f275aad3-60d8-4938-86cb-4a2932797707" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_14e2153c-9e8a-48d0-94a3-92bfbd144e13" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_387cc8fd-11e9-47eb-8e49-7e2f9daa6609" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_14e2153c-9e8a-48d0-94a3-92bfbd144e13" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_74f42d9c-7056-4a5c-b26d-2268ad63ec89" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_387cc8fd-11e9-47eb-8e49-7e2f9daa6609" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_74f42d9c-7056-4a5c-b26d-2268ad63ec89" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_d37961d6-7e3f-460a-a15f-021af8ae853c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_387cc8fd-11e9-47eb-8e49-7e2f9daa6609" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_d37961d6-7e3f-460a-a15f-021af8ae853c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_83d614ed-5a4f-4140-8634-1f555afcd9c7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_387cc8fd-11e9-47eb-8e49-7e2f9daa6609" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_83d614ed-5a4f-4140-8634-1f555afcd9c7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_e2bf0fa1-a2f1-4870-b822-df9409cbb7e6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_387cc8fd-11e9-47eb-8e49-7e2f9daa6609" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_e2bf0fa1-a2f1-4870-b822-df9409cbb7e6" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited_de59353b-1e24-4106-9966-c36a3ec17eaa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_387cc8fd-11e9-47eb-8e49-7e2f9daa6609" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited_de59353b-1e24-4106-9966-c36a3ec17eaa" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures_0eb94d0d-3e93-4ac0-9b21-5ce49447b908" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_387cc8fd-11e9-47eb-8e49-7e2f9daa6609" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures_0eb94d0d-3e93-4ac0-9b21-5ce49447b908" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_a45b5cc7-71d8-431b-a39b-b2a7505c2ca5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_387cc8fd-11e9-47eb-8e49-7e2f9daa6609" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_a45b5cc7-71d8-431b-a39b-b2a7505c2ca5" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_2b502998-e8a4-463d-b3d1-2f7eaa352143" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_387cc8fd-11e9-47eb-8e49-7e2f9daa6609" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_2b502998-e8a4-463d-b3d1-2f7eaa352143" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCash_740f3c3f-d719-4f72-a46b-8b79d62e20f9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DividendsCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_387cc8fd-11e9-47eb-8e49-7e2f9daa6609" xlink:to="loc_us-gaap_DividendsCash_740f3c3f-d719-4f72-a46b-8b79d62e20f9" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_AdjustmentsToAdditionalPaidInCapitalAcquisition_5e73bc81-7f72-446e-aba7-01fa33171d0a" xlink:href="wynn-20231231.xsd#wynn_AdjustmentsToAdditionalPaidInCapitalAcquisition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_387cc8fd-11e9-47eb-8e49-7e2f9daa6609" xlink:to="loc_wynn_AdjustmentsToAdditionalPaidInCapitalAcquisition_5e73bc81-7f72-446e-aba7-01fa33171d0a" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_e32da5c8-ba4f-4423-82c2-2a91a639d351" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_387cc8fd-11e9-47eb-8e49-7e2f9daa6609" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_e32da5c8-ba4f-4423-82c2-2a91a639d351" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_NoncontrollingInterestIncreaseDecreaseToAdditionalPaidInCapital_966ccaa4-cf0f-46af-8833-377f01a60921" xlink:href="wynn-20231231.xsd#wynn_NoncontrollingInterestIncreaseDecreaseToAdditionalPaidInCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_387cc8fd-11e9-47eb-8e49-7e2f9daa6609" xlink:to="loc_wynn_NoncontrollingInterestIncreaseDecreaseToAdditionalPaidInCapital_966ccaa4-cf0f-46af-8833-377f01a60921" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_NoncontrollingInterestTransactionsWithSubsidiaryMinorityShareholdersShares_4af16331-2df4-4292-bd3f-07d29d2ffc11" xlink:href="wynn-20231231.xsd#wynn_NoncontrollingInterestTransactionsWithSubsidiaryMinorityShareholdersShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_387cc8fd-11e9-47eb-8e49-7e2f9daa6609" xlink:to="loc_wynn_NoncontrollingInterestTransactionsWithSubsidiaryMinorityShareholdersShares_4af16331-2df4-4292-bd3f-07d29d2ffc11" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_NoncontrollingInterestTransactionsWithSubsidiaryMinorityShareholdersValue_82ce7c99-8b9a-42e7-b175-569f1df0dc24" xlink:href="wynn-20231231.xsd#wynn_NoncontrollingInterestTransactionsWithSubsidiaryMinorityShareholdersValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_387cc8fd-11e9-47eb-8e49-7e2f9daa6609" xlink:to="loc_wynn_NoncontrollingInterestTransactionsWithSubsidiaryMinorityShareholdersValue_82ce7c99-8b9a-42e7-b175-569f1df0dc24" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_AdditionalPaidInCapitalSubsidiaryStockIssuedDuringPeriodValueNewIssues_deec1524-b339-4706-ab3d-6906a42770b3" xlink:href="wynn-20231231.xsd#wynn_AdditionalPaidInCapitalSubsidiaryStockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_387cc8fd-11e9-47eb-8e49-7e2f9daa6609" xlink:to="loc_wynn_AdditionalPaidInCapitalSubsidiaryStockIssuedDuringPeriodValueNewIssues_deec1524-b339-4706-ab3d-6906a42770b3" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_6e80c9b9-6932-4f58-8876-3c035c2f6d2d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_387cc8fd-11e9-47eb-8e49-7e2f9daa6609" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_6e80c9b9-6932-4f58-8876-3c035c2f6d2d" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_e2e45f06-8104-448a-a6e7-9b0251c1d835" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_ad5970d9-da09-4409-b443-02b7350b5066" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/OrganizationandBusinessDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#OrganizationandBusinessDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/OrganizationandBusinessDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureLineItems_81c80605-da59-4ec6-86d9-0fb280d09b29" xlink:href="wynn-20231231.xsd#wynn_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTable_3e4dc165-615a-4fca-9025-b70a03546698" xlink:href="wynn-20231231.xsd#wynn_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_wynn_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureLineItems_81c80605-da59-4ec6-86d9-0fb280d09b29" xlink:to="loc_wynn_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTable_3e4dc165-615a-4fca-9025-b70a03546698" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_db11c54d-7ea6-4a9d-85ec-7ea6d172182b" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTable_3e4dc165-615a-4fca-9025-b70a03546698" xlink:to="loc_srt_OwnershipAxis_db11c54d-7ea6-4a9d-85ec-7ea6d172182b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_db11c54d-7ea6-4a9d-85ec-7ea6d172182b_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_db11c54d-7ea6-4a9d-85ec-7ea6d172182b" xlink:to="loc_srt_OwnershipDomain_db11c54d-7ea6-4a9d-85ec-7ea6d172182b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_416e5c6e-930e-4f81-bd4c-4e14d4d9452f" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_db11c54d-7ea6-4a9d-85ec-7ea6d172182b" xlink:to="loc_srt_OwnershipDomain_416e5c6e-930e-4f81-bd4c-4e14d4d9452f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnPalaceandWynnMacauMember_be42d4b5-7dda-48d1-9844-842bf7e3f166" xlink:href="wynn-20231231.xsd#wynn_WynnPalaceandWynnMacauMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_416e5c6e-930e-4f81-bd4c-4e14d4d9452f" xlink:to="loc_wynn_WynnPalaceandWynnMacauMember_be42d4b5-7dda-48d1-9844-842bf7e3f166" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnLasVegasMember_5de004c7-ef6c-40af-b6fc-a8afdf321b62" xlink:href="wynn-20231231.xsd#wynn_WynnLasVegasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_416e5c6e-930e-4f81-bd4c-4e14d4d9452f" xlink:to="loc_wynn_WynnLasVegasMember_5de004c7-ef6c-40af-b6fc-a8afdf321b62" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_RetailJointVentureMember_b82b3200-31d9-4597-bd6f-0f7a258fab52" xlink:href="wynn-20231231.xsd#wynn_RetailJointVentureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_416e5c6e-930e-4f81-bd4c-4e14d4d9452f" xlink:to="loc_wynn_RetailJointVentureMember_b82b3200-31d9-4597-bd6f-0f7a258fab52" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnInteractiveLtdMember_ccdf3ba0-ff4b-47b1-b9fa-5be921a4e7f2" xlink:href="wynn-20231231.xsd#wynn_WynnInteractiveLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_416e5c6e-930e-4f81-bd4c-4e14d4d9452f" xlink:to="loc_wynn_WynnInteractiveLtdMember_ccdf3ba0-ff4b-47b1-b9fa-5be921a4e7f2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_Island3AMIFZLLCMember_e930d198-e9c5-4c81-b769-476a3e737d2c" xlink:href="wynn-20231231.xsd#wynn_Island3AMIFZLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_416e5c6e-930e-4f81-bd4c-4e14d4d9452f" xlink:to="loc_wynn_Island3AMIFZLLCMember_e930d198-e9c5-4c81-b769-476a3e737d2c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_04736990-8dec-4bf1-95bd-aacef539ae57" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTable_3e4dc165-615a-4fca-9025-b70a03546698" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_04736990-8dec-4bf1-95bd-aacef539ae57" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_04736990-8dec-4bf1-95bd-aacef539ae57_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_04736990-8dec-4bf1-95bd-aacef539ae57" xlink:to="loc_us-gaap_SegmentDomain_04736990-8dec-4bf1-95bd-aacef539ae57_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_fab8367e-4fbd-466f-ac31-d9c85518b095" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_04736990-8dec-4bf1-95bd-aacef539ae57" xlink:to="loc_us-gaap_SegmentDomain_fab8367e-4fbd-466f-ac31-d9c85518b095" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_MacauOperationsMember_d164a054-55ae-4b6c-90d1-ae956c42f7ce" xlink:href="wynn-20231231.xsd#wynn_MacauOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_fab8367e-4fbd-466f-ac31-d9c85518b095" xlink:to="loc_wynn_MacauOperationsMember_d164a054-55ae-4b6c-90d1-ae956c42f7ce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_LasVegasOperationsMember_9ad35fc2-d282-477a-8226-d2de885ceaa9" xlink:href="wynn-20231231.xsd#wynn_LasVegasOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_fab8367e-4fbd-466f-ac31-d9c85518b095" xlink:to="loc_wynn_LasVegasOperationsMember_9ad35fc2-d282-477a-8226-d2de885ceaa9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_EncoreBostonHarborMember_2056cf66-fd3a-4075-811c-cd9683e474bd" xlink:href="wynn-20231231.xsd#wynn_EncoreBostonHarborMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_fab8367e-4fbd-466f-ac31-d9c85518b095" xlink:to="loc_wynn_EncoreBostonHarborMember_2056cf66-fd3a-4075-811c-cd9683e474bd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_ab7c2c41-552f-4deb-910a-9ac89197c781" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTable_3e4dc165-615a-4fca-9025-b70a03546698" xlink:to="loc_dei_LegalEntityAxis_ab7c2c41-552f-4deb-910a-9ac89197c781" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_ab7c2c41-552f-4deb-910a-9ac89197c781_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_ab7c2c41-552f-4deb-910a-9ac89197c781" xlink:to="loc_dei_EntityDomain_ab7c2c41-552f-4deb-910a-9ac89197c781_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_2a533c45-e8c0-4097-8b90-8796099e144f" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_ab7c2c41-552f-4deb-910a-9ac89197c781" xlink:to="loc_dei_EntityDomain_2a533c45-e8c0-4097-8b90-8796099e144f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnPalaceMember_60ba3419-6d3f-486e-865c-0fced83164c8" xlink:href="wynn-20231231.xsd#wynn_WynnPalaceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_2a533c45-e8c0-4097-8b90-8796099e144f" xlink:to="loc_wynn_WynnPalaceMember_60ba3419-6d3f-486e-865c-0fced83164c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnMacauMember_534a0417-62a7-4f2a-a99b-20508362cf34" xlink:href="wynn-20231231.xsd#wynn_WynnMacauMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_2a533c45-e8c0-4097-8b90-8796099e144f" xlink:to="loc_wynn_WynnMacauMember_534a0417-62a7-4f2a-a99b-20508362cf34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnLasVegasMember_f53be718-4a0b-46d6-bd78-a1f5aca7f2b4" xlink:href="wynn-20231231.xsd#wynn_WynnLasVegasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_2a533c45-e8c0-4097-8b90-8796099e144f" xlink:to="loc_wynn_WynnLasVegasMember_f53be718-4a0b-46d6-bd78-a1f5aca7f2b4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_548436dc-1e28-4a86-bb94-00c4789ace49" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTable_3e4dc165-615a-4fca-9025-b70a03546698" xlink:to="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_548436dc-1e28-4a86-bb94-00c4789ace49" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_548436dc-1e28-4a86-bb94-00c4789ace49_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MortgageLoansOnRealEstateNamePropertyTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_548436dc-1e28-4a86-bb94-00c4789ace49" xlink:to="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_548436dc-1e28-4a86-bb94-00c4789ace49_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_5548e559-0330-405d-a801-e428cc8c754d" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MortgageLoansOnRealEstateNamePropertyTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_548436dc-1e28-4a86-bb94-00c4789ace49" xlink:to="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_5548e559-0330-405d-a801-e428cc8c754d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CasinoMember_1cffc5bf-323c-486f-ba3f-1531082bded2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CasinoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_5548e559-0330-405d-a801-e428cc8c754d" xlink:to="loc_us-gaap_CasinoMember_1cffc5bf-323c-486f-ba3f-1531082bded2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_MeetingAndConventionMember_610074b9-a864-4cd9-a6d4-4d4bc30d9609" xlink:href="wynn-20231231.xsd#wynn_MeetingAndConventionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_5548e559-0330-405d-a801-e428cc8c754d" xlink:to="loc_wynn_MeetingAndConventionMember_610074b9-a864-4cd9-a6d4-4d4bc30d9609" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RetailSiteMember_79dec5d0-b641-4ef8-a773-7cd990a184eb" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RetailSiteMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_5548e559-0330-405d-a801-e428cc8c754d" xlink:to="loc_srt_RetailSiteMember_79dec5d0-b641-4ef8-a773-7cd990a184eb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_5b7f36da-77fb-4c83-b1f8-24c93866803f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTable_3e4dc165-615a-4fca-9025-b70a03546698" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_5b7f36da-77fb-4c83-b1f8-24c93866803f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_5b7f36da-77fb-4c83-b1f8-24c93866803f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_5b7f36da-77fb-4c83-b1f8-24c93866803f" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_5b7f36da-77fb-4c83-b1f8-24c93866803f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_e67f23e3-7fa4-4483-a660-cbc9d5729e4f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_5b7f36da-77fb-4c83-b1f8-24c93866803f" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_e67f23e3-7fa4-4483-a660-cbc9d5729e4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_50973fe0-9ce5-452e-b2a6-822fcc28e9ab" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_e67f23e3-7fa4-4483-a660-cbc9d5729e4f" xlink:to="loc_us-gaap_SubsequentEventMember_50973fe0-9ce5-452e-b2a6-822fcc28e9ab" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_13016f40-eeab-42de-a8e2-a267d79762e3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MinorityInterestOwnershipPercentageByParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureLineItems_81c80605-da59-4ec6-86d9-0fb280d09b29" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_13016f40-eeab-42de-a8e2-a267d79762e3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_NumberOfRoomsInHotel_732c51fe-9fd9-4dcd-be85-df676d2edb76" xlink:href="wynn-20231231.xsd#wynn_NumberOfRoomsInHotel"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureLineItems_81c80605-da59-4ec6-86d9-0fb280d09b29" xlink:to="loc_wynn_NumberOfRoomsInHotel_732c51fe-9fd9-4dcd-be85-df676d2edb76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FunctionalAreaSquareFootage_63443980-decd-4c6e-a0c2-71117f618c4f" xlink:href="wynn-20231231.xsd#wynn_FunctionalAreaSquareFootage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureLineItems_81c80605-da59-4ec6-86d9-0fb280d09b29" xlink:to="loc_wynn_FunctionalAreaSquareFootage_63443980-decd-4c6e-a0c2-71117f618c4f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfRestaurants_6ab50a3d-aac5-4539-a311-133c0b8fd506" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NumberOfRestaurants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureLineItems_81c80605-da59-4ec6-86d9-0fb280d09b29" xlink:to="loc_us-gaap_NumberOfRestaurants_6ab50a3d-aac5-4539-a311-133c0b8fd506" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_NumberOfHotelTowers_7e068062-117e-401a-aa4c-5be176e2ae9a" xlink:href="wynn-20231231.xsd#wynn_NumberOfHotelTowers"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureLineItems_81c80605-da59-4ec6-86d9-0fb280d09b29" xlink:to="loc_wynn_NumberOfHotelTowers_7e068062-117e-401a-aa4c-5be176e2ae9a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_NumberOfShowrooms_471618ec-5e02-471d-b00a-920f80a2549e" xlink:href="wynn-20231231.xsd#wynn_NumberOfShowrooms"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureLineItems_81c80605-da59-4ec6-86d9-0fb280d09b29" xlink:to="loc_wynn_NumberOfShowrooms_471618ec-5e02-471d-b00a-920f80a2549e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_NumberOfFacilities_82f700a0-8295-4712-bc64-9038d7fc1da9" xlink:href="wynn-20231231.xsd#wynn_NumberOfFacilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureLineItems_81c80605-da59-4ec6-86d9-0fb280d09b29" xlink:to="loc_wynn_NumberOfFacilities_82f700a0-8295-4712-bc64-9038d7fc1da9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_ProceedsFromSaleLeasebackTransaction_59679ded-ffd7-451d-b070-82a0cb0e3b47" xlink:href="wynn-20231231.xsd#wynn_ProceedsFromSaleLeasebackTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureLineItems_81c80605-da59-4ec6-86d9-0fb280d09b29" xlink:to="loc_wynn_ProceedsFromSaleLeasebackTransaction_59679ded-ffd7-451d-b070-82a0cb0e3b47" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/BasisofPresentationandSignificantAccountingPoliciesAdditionalInformationDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#BasisofPresentationandSignificantAccountingPoliciesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/BasisofPresentationandSignificantAccountingPoliciesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_wynn_SummaryOfSignificantAccountingPoliciesLineItems_fc7df2f3-8637-43e3-bbc3-09f98a0baffd" xlink:href="wynn-20231231.xsd#wynn_SummaryOfSignificantAccountingPoliciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_SummaryOfSignificantAccountingPoliciesTable_33aa8eb4-c109-4bd3-8683-f9a6f0770da8" xlink:href="wynn-20231231.xsd#wynn_SummaryOfSignificantAccountingPoliciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_wynn_SummaryOfSignificantAccountingPoliciesLineItems_fc7df2f3-8637-43e3-bbc3-09f98a0baffd" xlink:to="loc_wynn_SummaryOfSignificantAccountingPoliciesTable_33aa8eb4-c109-4bd3-8683-f9a6f0770da8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_d3822b02-5a27-4460-ae73-ef2b4bc911f5" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_SummaryOfSignificantAccountingPoliciesTable_33aa8eb4-c109-4bd3-8683-f9a6f0770da8" xlink:to="loc_srt_CounterpartyNameAxis_d3822b02-5a27-4460-ae73-ef2b4bc911f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_d3822b02-5a27-4460-ae73-ef2b4bc911f5_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_d3822b02-5a27-4460-ae73-ef2b4bc911f5" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_d3822b02-5a27-4460-ae73-ef2b4bc911f5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_53330c22-0ee1-4c04-a607-86c16c81959b" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_d3822b02-5a27-4460-ae73-ef2b4bc911f5" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_53330c22-0ee1-4c04-a607-86c16c81959b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnPalaceMember_139428f5-1ecd-406e-a217-2bac9507ec71" xlink:href="wynn-20231231.xsd#wynn_WynnPalaceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_53330c22-0ee1-4c04-a607-86c16c81959b" xlink:to="loc_wynn_WynnPalaceMember_139428f5-1ecd-406e-a217-2bac9507ec71" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnMacauMember_1f954e59-78b6-401b-a473-b7b1a4048e1e" xlink:href="wynn-20231231.xsd#wynn_WynnMacauMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_53330c22-0ee1-4c04-a607-86c16c81959b" xlink:to="loc_wynn_WynnMacauMember_1f954e59-78b6-401b-a473-b7b1a4048e1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnLasVegasMember_5d8d0cd1-5752-49cb-b46d-e83d09fbb62e" xlink:href="wynn-20231231.xsd#wynn_WynnLasVegasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_53330c22-0ee1-4c04-a607-86c16c81959b" xlink:to="loc_wynn_WynnLasVegasMember_5d8d0cd1-5752-49cb-b46d-e83d09fbb62e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_EncoreBostonHarborMember_bc31bfff-5bb4-4401-9771-698b13b044da" xlink:href="wynn-20231231.xsd#wynn_EncoreBostonHarborMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_53330c22-0ee1-4c04-a607-86c16c81959b" xlink:to="loc_wynn_EncoreBostonHarborMember_bc31bfff-5bb4-4401-9771-698b13b044da" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_c213f431-d9c7-43d0-a8bc-b34f0000274a" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_SummaryOfSignificantAccountingPoliciesTable_33aa8eb4-c109-4bd3-8683-f9a6f0770da8" xlink:to="loc_srt_RangeAxis_c213f431-d9c7-43d0-a8bc-b34f0000274a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_c213f431-d9c7-43d0-a8bc-b34f0000274a_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_c213f431-d9c7-43d0-a8bc-b34f0000274a" xlink:to="loc_srt_RangeMember_c213f431-d9c7-43d0-a8bc-b34f0000274a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_26ace6bd-29cf-46e0-bdd7-46dace5a9752" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_c213f431-d9c7-43d0-a8bc-b34f0000274a" xlink:to="loc_srt_RangeMember_26ace6bd-29cf-46e0-bdd7-46dace5a9752" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_d96a5395-e1fc-48f2-ba20-a0fd3d4a3c3d" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_26ace6bd-29cf-46e0-bdd7-46dace5a9752" xlink:to="loc_srt_MinimumMember_d96a5395-e1fc-48f2-ba20-a0fd3d4a3c3d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_b41563fe-1e71-4d1a-9699-7f8643e0cecc" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_26ace6bd-29cf-46e0-bdd7-46dace5a9752" xlink:to="loc_srt_MaximumMember_b41563fe-1e71-4d1a-9699-7f8643e0cecc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_118f1400-856d-4c0d-8430-4d98f4431331" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_SummaryOfSignificantAccountingPoliciesTable_33aa8eb4-c109-4bd3-8683-f9a6f0770da8" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_118f1400-856d-4c0d-8430-4d98f4431331" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_118f1400-856d-4c0d-8430-4d98f4431331_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_118f1400-856d-4c0d-8430-4d98f4431331" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_118f1400-856d-4c0d-8430-4d98f4431331_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_b196338e-74d1-45eb-acfd-41b77f6133ec" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_118f1400-856d-4c0d-8430-4d98f4431331" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_b196338e-74d1-45eb-acfd-41b77f6133ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_ddc76910-d6c8-4534-b7b0-2ffc2d91f0e4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_b196338e-74d1-45eb-acfd-41b77f6133ec" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_ddc76910-d6c8-4534-b7b0-2ffc2d91f0e4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_e356f2e4-9c75-49b5-8e59-4c6f8924f240" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_SummaryOfSignificantAccountingPoliciesTable_33aa8eb4-c109-4bd3-8683-f9a6f0770da8" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_e356f2e4-9c75-49b5-8e59-4c6f8924f240" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_e356f2e4-9c75-49b5-8e59-4c6f8924f240_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_e356f2e4-9c75-49b5-8e59-4c6f8924f240" xlink:to="loc_us-gaap_EquityComponentDomain_e356f2e4-9c75-49b5-8e59-4c6f8924f240_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_b5c8a94c-b311-4627-8c57-57d7055b801d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_e356f2e4-9c75-49b5-8e59-4c6f8924f240" xlink:to="loc_us-gaap_EquityComponentDomain_b5c8a94c-b311-4627-8c57-57d7055b801d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_adb373af-9384-4d9c-af3c-d7ec3bcb0c83" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_b5c8a94c-b311-4627-8c57-57d7055b801d" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_adb373af-9384-4d9c-af3c-d7ec3bcb0c83" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_8df56ddb-2fa3-48fa-981b-4cc6a2108bbd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_b5c8a94c-b311-4627-8c57-57d7055b801d" xlink:to="loc_us-gaap_RetainedEarningsMember_8df56ddb-2fa3-48fa-981b-4cc6a2108bbd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashEquivalentsCurrent_0240da6d-a863-46a0-88f6-fca592cef371" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedCashEquivalentsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_SummaryOfSignificantAccountingPoliciesLineItems_fc7df2f3-8637-43e3-bbc3-09f98a0baffd" xlink:to="loc_us-gaap_RestrictedCashEquivalentsCurrent_0240da6d-a863-46a0-88f6-fca592cef371" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLossCurrent_a5beef31-4cb6-49e8-963a-921c40998053" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLossCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_SummaryOfSignificantAccountingPoliciesLineItems_fc7df2f3-8637-43e3-bbc3-09f98a0baffd" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLossCurrent_a5beef31-4cb6-49e8-963a-921c40998053" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityFairValueCurrent_93032330-ed49-48d1-ba5e-72cb3678b441" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtSecuritiesHeldToMaturityFairValueCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_SummaryOfSignificantAccountingPoliciesLineItems_fc7df2f3-8637-43e3-bbc3-09f98a0baffd" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityFairValueCurrent_93032330-ed49-48d1-ba5e-72cb3678b441" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_23f6a078-0855-49be-ad9b-8901d3fe0abb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_SummaryOfSignificantAccountingPoliciesLineItems_fc7df2f3-8637-43e3-bbc3-09f98a0baffd" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_23f6a078-0855-49be-ad9b-8901d3fe0abb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss_c233f44e-fb7c-45db-aa3a-ec32446feeeb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_SummaryOfSignificantAccountingPoliciesLineItems_fc7df2f3-8637-43e3-bbc3-09f98a0baffd" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss_c233f44e-fb7c-45db-aa3a-ec32446feeeb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList_87b15e6d-edd4-4099-847b-ac096ad7ef40" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss_c233f44e-fb7c-45db-aa3a-ec32446feeeb" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList_87b15e6d-edd4-4099-847b-ac096ad7ef40" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsHeldtomaturitySecurities_626c58e9-ef25-468c-afdc-0e21e5e51aa6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsHeldtomaturitySecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_SummaryOfSignificantAccountingPoliciesLineItems_fc7df2f3-8637-43e3-bbc3-09f98a0baffd" xlink:to="loc_us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsHeldtomaturitySecurities_626c58e9-ef25-468c-afdc-0e21e5e51aa6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt_156a8432-b2b6-461d-8f6b-763d45265332" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestExpenseDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_SummaryOfSignificantAccountingPoliciesLineItems_fc7df2f3-8637-43e3-bbc3-09f98a0baffd" xlink:to="loc_us-gaap_InterestExpenseDebt_156a8432-b2b6-461d-8f6b-763d45265332" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_LessorOperatingLeaseSquareFootageOfSpaceLeased_753961c7-d334-4156-8a30-d10ef1602884" xlink:href="wynn-20231231.xsd#wynn_LessorOperatingLeaseSquareFootageOfSpaceLeased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_SummaryOfSignificantAccountingPoliciesLineItems_fc7df2f3-8637-43e3-bbc3-09f98a0baffd" xlink:to="loc_wynn_LessorOperatingLeaseSquareFootageOfSpaceLeased_753961c7-d334-4156-8a30-d10ef1602884" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeaseTermOfContract_202055bb-65ee-4cc2-b8eb-5404ad094859" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LessorOperatingLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_SummaryOfSignificantAccountingPoliciesLineItems_fc7df2f3-8637-43e3-bbc3-09f98a0baffd" xlink:to="loc_us-gaap_LessorOperatingLeaseTermOfContract_202055bb-65ee-4cc2-b8eb-5404ad094859" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_b152a37e-7402-4591-8b63-35c6d22141d6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_SummaryOfSignificantAccountingPoliciesLineItems_fc7df2f3-8637-43e3-bbc3-09f98a0baffd" xlink:to="loc_us-gaap_EquityMethodInvestments_b152a37e-7402-4591-8b63-35c6d22141d6" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_6fa8d3e4-f992-4c74-80c8-2dd11910a332" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_SummaryOfSignificantAccountingPoliciesLineItems_fc7df2f3-8637-43e3-bbc3-09f98a0baffd" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_6fa8d3e4-f992-4c74-80c8-2dd11910a332" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_AmortizationOfDeferredFinancingCostsandOther_8d43bb46-bd1e-44e5-9efc-6a56344652a9" xlink:href="wynn-20231231.xsd#wynn_AmortizationOfDeferredFinancingCostsandOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_SummaryOfSignificantAccountingPoliciesLineItems_fc7df2f3-8637-43e3-bbc3-09f98a0baffd" xlink:to="loc_wynn_AmortizationOfDeferredFinancingCostsandOther_8d43bb46-bd1e-44e5-9efc-6a56344652a9" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DerivativeAssetStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag_ddebf2c5-0606-48ab-9d60-a0a98aafbd32" xlink:href="wynn-20231231.xsd#wynn_DerivativeAssetStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_SummaryOfSignificantAccountingPoliciesLineItems_fc7df2f3-8637-43e3-bbc3-09f98a0baffd" xlink:to="loc_wynn_DerivativeAssetStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag_ddebf2c5-0606-48ab-9d60-a0a98aafbd32" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_GamingTaxExpenses_773015f7-9bad-45c7-9198-836b7541fef9" xlink:href="wynn-20231231.xsd#wynn_GamingTaxExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_SummaryOfSignificantAccountingPoliciesLineItems_fc7df2f3-8637-43e3-bbc3-09f98a0baffd" xlink:to="loc_wynn_GamingTaxExpenses_773015f7-9bad-45c7-9198-836b7541fef9" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdvertisingExpense_1916b3cc-39e3-4182-9913-e4c534a2d4f1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdvertisingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_SummaryOfSignificantAccountingPoliciesLineItems_fc7df2f3-8637-43e3-bbc3-09f98a0baffd" xlink:to="loc_us-gaap_AdvertisingExpense_1916b3cc-39e3-4182-9913-e4c534a2d4f1" xlink:type="arc" order="14"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/BasisofPresentationandSignificantAccountingPoliciesEstimatedUsefulLivesofAssetsDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#BasisofPresentationandSignificantAccountingPoliciesEstimatedUsefulLivesofAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/BasisofPresentationandSignificantAccountingPoliciesEstimatedUsefulLivesofAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_93f34212-15d7-49ad-9514-f2208e766a21" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_9305d5c7-5ad3-48bc-959f-be8ee0bfe74c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_93f34212-15d7-49ad-9514-f2208e766a21" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_9305d5c7-5ad3-48bc-959f-be8ee0bfe74c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_fd7b9268-4bdc-4eab-98e9-53bb0ce3f049" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_9305d5c7-5ad3-48bc-959f-be8ee0bfe74c" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_fd7b9268-4bdc-4eab-98e9-53bb0ce3f049" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_fd7b9268-4bdc-4eab-98e9-53bb0ce3f049_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_fd7b9268-4bdc-4eab-98e9-53bb0ce3f049" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_fd7b9268-4bdc-4eab-98e9-53bb0ce3f049_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_2a2d6499-f197-4bf5-9d03-0b3c7c7dbea2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_fd7b9268-4bdc-4eab-98e9-53bb0ce3f049" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_2a2d6499-f197-4bf5-9d03-0b3c7c7dbea2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_BuildingsAndImprovementsMember_19347487-7f08-40bb-bb94-2118e95a1a83" xlink:href="wynn-20231231.xsd#wynn_BuildingsAndImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_2a2d6499-f197-4bf5-9d03-0b3c7c7dbea2" xlink:to="loc_wynn_BuildingsAndImprovementsMember_19347487-7f08-40bb-bb94-2118e95a1a83" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandImprovementsMember_78199de5-74e9-4f5a-8225-14e1bcbb983a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LandImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_2a2d6499-f197-4bf5-9d03-0b3c7c7dbea2" xlink:to="loc_us-gaap_LandImprovementsMember_78199de5-74e9-4f5a-8225-14e1bcbb983a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_LeaseholdInterestInLandMember_77d6d166-8b6f-49b3-8a87-4a6ca72bd8dc" xlink:href="wynn-20231231.xsd#wynn_LeaseholdInterestInLandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_2a2d6499-f197-4bf5-9d03-0b3c7c7dbea2" xlink:to="loc_wynn_LeaseholdInterestInLandMember_77d6d166-8b6f-49b3-8a87-4a6ca72bd8dc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_AirplanesMember_8b2e3977-6b44-4992-9ddc-e1778a4f6f6b" xlink:href="wynn-20231231.xsd#wynn_AirplanesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_2a2d6499-f197-4bf5-9d03-0b3c7c7dbea2" xlink:to="loc_wynn_AirplanesMember_8b2e3977-6b44-4992-9ddc-e1778a4f6f6b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FurnitureFixturesAndEquipmentMember_0c2d8d50-6733-430c-9d5a-11b6758c926d" xlink:href="wynn-20231231.xsd#wynn_FurnitureFixturesAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_2a2d6499-f197-4bf5-9d03-0b3c7c7dbea2" xlink:to="loc_wynn_FurnitureFixturesAndEquipmentMember_0c2d8d50-6733-430c-9d5a-11b6758c926d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_b7620745-5295-4e5d-8f8c-29445c3f30d4" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_9305d5c7-5ad3-48bc-959f-be8ee0bfe74c" xlink:to="loc_srt_RangeAxis_b7620745-5295-4e5d-8f8c-29445c3f30d4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_b7620745-5295-4e5d-8f8c-29445c3f30d4_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_b7620745-5295-4e5d-8f8c-29445c3f30d4" xlink:to="loc_srt_RangeMember_b7620745-5295-4e5d-8f8c-29445c3f30d4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_ec7ed19e-6596-468d-a63e-ea0d74abf2c6" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_b7620745-5295-4e5d-8f8c-29445c3f30d4" xlink:to="loc_srt_RangeMember_ec7ed19e-6596-468d-a63e-ea0d74abf2c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_09e06236-33e8-4d43-9e47-22ad280f2848" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_ec7ed19e-6596-468d-a63e-ea0d74abf2c6" xlink:to="loc_srt_MinimumMember_09e06236-33e8-4d43-9e47-22ad280f2848" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_576d6b0e-8ab6-456d-9e9f-57d5dcc5c7d3" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_ec7ed19e-6596-468d-a63e-ea0d74abf2c6" xlink:to="loc_srt_MaximumMember_576d6b0e-8ab6-456d-9e9f-57d5dcc5c7d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_5b3006c0-0a6c-4861-88db-4fce99f3aeb6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_93f34212-15d7-49ad-9514-f2208e766a21" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_5b3006c0-0a6c-4861-88db-4fce99f3aeb6" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/ReceivablesnetAdditionalInformationDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#ReceivablesnetAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/ReceivablesnetAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_06ae8516-1308-4675-b001-cf2f38863cb9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_73a35c02-831b-438c-9e17-779234780eba" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_06ae8516-1308-4675-b001-cf2f38863cb9" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_73a35c02-831b-438c-9e17-779234780eba" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis_5cb1045f-4c71-4a60-9e78-ca8648e8da4d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_73a35c02-831b-438c-9e17-779234780eba" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis_5cb1045f-4c71-4a60-9e78-ca8648e8da4d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LegalEntityTypeOfCounterpartyDomain_5cb1045f-4c71-4a60-9e78-ca8648e8da4d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LegalEntityTypeOfCounterpartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis_5cb1045f-4c71-4a60-9e78-ca8648e8da4d" xlink:to="loc_us-gaap_LegalEntityTypeOfCounterpartyDomain_5cb1045f-4c71-4a60-9e78-ca8648e8da4d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LegalEntityTypeOfCounterpartyDomain_0f1df0a8-8b25-4e14-a7c7-f5fb4216b5a0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LegalEntityTypeOfCounterpartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis_5cb1045f-4c71-4a60-9e78-ca8648e8da4d" xlink:to="loc_us-gaap_LegalEntityTypeOfCounterpartyDomain_0f1df0a8-8b25-4e14-a7c7-f5fb4216b5a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CasinoMember_a7ed4b21-2697-4f45-8433-1226750eb9c0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CasinoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LegalEntityTypeOfCounterpartyDomain_0f1df0a8-8b25-4e14-a7c7-f5fb4216b5a0" xlink:to="loc_us-gaap_CasinoMember_a7ed4b21-2697-4f45-8433-1226750eb9c0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_HotelMember_de0c8c39-7928-4a94-a5e4-7ea99d77a3c4" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_HotelMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LegalEntityTypeOfCounterpartyDomain_0f1df0a8-8b25-4e14-a7c7-f5fb4216b5a0" xlink:to="loc_srt_HotelMember_de0c8c39-7928-4a94-a5e4-7ea99d77a3c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_RetailLeasesAndOtherMember_aa4c593c-7fc5-4b85-abd0-d76451778fd6" xlink:href="wynn-20231231.xsd#wynn_RetailLeasesAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LegalEntityTypeOfCounterpartyDomain_0f1df0a8-8b25-4e14-a7c7-f5fb4216b5a0" xlink:to="loc_wynn_RetailLeasesAndOtherMember_aa4c593c-7fc5-4b85-abd0-d76451778fd6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_27d8b834-7094-403c-83d4-98ae87390ccc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_73a35c02-831b-438c-9e17-779234780eba" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_27d8b834-7094-403c-83d4-98ae87390ccc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_27d8b834-7094-403c-83d4-98ae87390ccc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_27d8b834-7094-403c-83d4-98ae87390ccc" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_27d8b834-7094-403c-83d4-98ae87390ccc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_3636c330-a202-4e97-a0ef-cf15fb046cc9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_27d8b834-7094-403c-83d4-98ae87390ccc" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_3636c330-a202-4e97-a0ef-cf15fb046cc9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicConcentrationRiskMember_99e98f8b-cf5a-4d72-8015-f35d2bbc4176" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GeographicConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_3636c330-a202-4e97-a0ef-cf15fb046cc9" xlink:to="loc_us-gaap_GeographicConcentrationRiskMember_99e98f8b-cf5a-4d72-8015-f35d2bbc4176" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_f754e696-de80-4018-a933-5489765ae755" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_73a35c02-831b-438c-9e17-779234780eba" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_f754e696-de80-4018-a933-5489765ae755" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_f754e696-de80-4018-a933-5489765ae755_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_f754e696-de80-4018-a933-5489765ae755" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_f754e696-de80-4018-a933-5489765ae755_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_36da9805-6dff-437d-9a9c-5d7e025365f3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_f754e696-de80-4018-a933-5489765ae755" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_36da9805-6dff-437d-9a9c-5d7e025365f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableMember_2294e442-6d75-4992-b653-4830159b5637" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_36da9805-6dff-437d-9a9c-5d7e025365f3" xlink:to="loc_us-gaap_AccountsReceivableMember_2294e442-6d75-4992-b653-4830159b5637" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_7bf3a887-9628-4ca2-99af-617469a1d5e9" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_73a35c02-831b-438c-9e17-779234780eba" xlink:to="loc_srt_StatementGeographicalAxis_7bf3a887-9628-4ca2-99af-617469a1d5e9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_7bf3a887-9628-4ca2-99af-617469a1d5e9_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_7bf3a887-9628-4ca2-99af-617469a1d5e9" xlink:to="loc_srt_SegmentGeographicalDomain_7bf3a887-9628-4ca2-99af-617469a1d5e9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_12dd274f-af0a-41d3-872e-272d4533fd55" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_7bf3a887-9628-4ca2-99af-617469a1d5e9" xlink:to="loc_srt_SegmentGeographicalDomain_12dd274f-af0a-41d3-872e-272d4533fd55" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaMember_a3fef626-c928-46b8-b196-5479f1f79fa3" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_AsiaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_12dd274f-af0a-41d3-872e-272d4533fd55" xlink:to="loc_srt_AsiaMember_a3fef626-c928-46b8-b196-5479f1f79fa3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableGrossCurrent_a3b17970-2cae-46f2-b536-6bd1e3d5bd90" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsReceivableGrossCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_06ae8516-1308-4675-b001-cf2f38863cb9" xlink:to="loc_us-gaap_AccountsReceivableGrossCurrent_a3b17970-2cae-46f2-b536-6bd1e3d5bd90" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_4091d15b-2519-4bb4-8d60-a7ecc1fae7a1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_06ae8516-1308-4675-b001-cf2f38863cb9" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_4091d15b-2519-4bb4-8d60-a7ecc1fae7a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_de593985-050c-4bc2-8dbd-b2deb8a43292" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReceivablesNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_06ae8516-1308-4675-b001-cf2f38863cb9" xlink:to="loc_us-gaap_ReceivablesNetCurrent_de593985-050c-4bc2-8dbd-b2deb8a43292" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_cd0fc888-6c90-411f-b19a-3a7552a31c26" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_06ae8516-1308-4675-b001-cf2f38863cb9" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_cd0fc888-6c90-411f-b19a-3a7552a31c26" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_AccountsReceivableAllowanceForCreditLossPercentOfGrossCasinoReceivables_f2003562-3fe0-42d6-9fdb-63b20b0ed060" xlink:href="wynn-20231231.xsd#wynn_AccountsReceivableAllowanceForCreditLossPercentOfGrossCasinoReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_06ae8516-1308-4675-b001-cf2f38863cb9" xlink:to="loc_wynn_AccountsReceivableAllowanceForCreditLossPercentOfGrossCasinoReceivables_f2003562-3fe0-42d6-9fdb-63b20b0ed060" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/PropertyandEquipmentnetPropertyandEquipmentnetNarrativeDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#PropertyandEquipmentnetPropertyandEquipmentnetNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/PropertyandEquipmentnetPropertyandEquipmentnetNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_32631f58-0cf3-4582-9683-1c0f39ba45df" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_8eed2be3-f7fd-478a-929c-868a9519c2fa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_32631f58-0cf3-4582-9683-1c0f39ba45df" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_8eed2be3-f7fd-478a-929c-868a9519c2fa" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_5f327974-da3e-49db-8022-d43f48b81e10" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_8eed2be3-f7fd-478a-929c-868a9519c2fa" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_5f327974-da3e-49db-8022-d43f48b81e10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_5f327974-da3e-49db-8022-d43f48b81e10_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_5f327974-da3e-49db-8022-d43f48b81e10" xlink:to="loc_us-gaap_SegmentDomain_5f327974-da3e-49db-8022-d43f48b81e10_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_8686e3cd-267c-465d-9f54-692e7e3eebf4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_5f327974-da3e-49db-8022-d43f48b81e10" xlink:to="loc_us-gaap_SegmentDomain_8686e3cd-267c-465d-9f54-692e7e3eebf4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_EncoreBostonHarborMember_34724ccd-ed36-4a89-a6fc-6873836ea4f9" xlink:href="wynn-20231231.xsd#wynn_EncoreBostonHarborMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8686e3cd-267c-465d-9f54-692e7e3eebf4" xlink:to="loc_wynn_EncoreBostonHarborMember_34724ccd-ed36-4a89-a6fc-6873836ea4f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_23de354e-0478-4984-989e-d971833ef5c3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCommitmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_8eed2be3-f7fd-478a-929c-868a9519c2fa" xlink:to="loc_us-gaap_OtherCommitmentsAxis_23de354e-0478-4984-989e-d971833ef5c3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_23de354e-0478-4984-989e-d971833ef5c3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_23de354e-0478-4984-989e-d971833ef5c3" xlink:to="loc_us-gaap_OtherCommitmentsDomain_23de354e-0478-4984-989e-d971833ef5c3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_9466f05f-297e-40fe-8c79-9ba53d57221f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_23de354e-0478-4984-989e-d971833ef5c3" xlink:to="loc_us-gaap_OtherCommitmentsDomain_9466f05f-297e-40fe-8c79-9ba53d57221f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_MacauGamingConcessionMember_d50d0b7c-890c-4030-939c-ab655db92b70" xlink:href="wynn-20231231.xsd#wynn_MacauGamingConcessionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_9466f05f-297e-40fe-8c79-9ba53d57221f" xlink:to="loc_wynn_MacauGamingConcessionMember_d50d0b7c-890c-4030-939c-ab655db92b70" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_bea0ba8d-7678-4072-a81b-cceee52c186a" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_8eed2be3-f7fd-478a-929c-868a9519c2fa" xlink:to="loc_dei_LegalEntityAxis_bea0ba8d-7678-4072-a81b-cceee52c186a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_bea0ba8d-7678-4072-a81b-cceee52c186a_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_bea0ba8d-7678-4072-a81b-cceee52c186a" xlink:to="loc_dei_EntityDomain_bea0ba8d-7678-4072-a81b-cceee52c186a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_cee077aa-860e-4728-af34-121d47a60959" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_bea0ba8d-7678-4072-a81b-cceee52c186a" xlink:to="loc_dei_EntityDomain_cee077aa-860e-4728-af34-121d47a60959" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnMacauSAMember_66853246-eb2a-4a10-9910-d82114bafb66" xlink:href="wynn-20231231.xsd#wynn_WynnMacauSAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_cee077aa-860e-4728-af34-121d47a60959" xlink:to="loc_wynn_WynnMacauSAMember_66853246-eb2a-4a10-9910-d82114bafb66" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_599de860-c88d-4c5b-b5f1-3a39619cc043" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Depreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_32631f58-0cf3-4582-9683-1c0f39ba45df" xlink:to="loc_us-gaap_Depreciation_599de860-c88d-4c5b-b5f1-3a39619cc043" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_ProceedsFromSaleLeasebackTransaction_c445f216-6cdd-4314-beb1-49b8ee56e83a" xlink:href="wynn-20231231.xsd#wynn_ProceedsFromSaleLeasebackTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_32631f58-0cf3-4582-9683-1c0f39ba45df" xlink:to="loc_wynn_ProceedsFromSaleLeasebackTransaction_c445f216-6cdd-4314-beb1-49b8ee56e83a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleAndLeasebackTransactionGainLossNet_445c43bf-0aec-42c5-aca8-8b84cb21a093" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SaleAndLeasebackTransactionGainLossNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_32631f58-0cf3-4582-9683-1c0f39ba45df" xlink:to="loc_us-gaap_SaleAndLeasebackTransactionGainLossNet_445c43bf-0aec-42c5-aca8-8b84cb21a093" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentToBePaidYearsOneThroughThree_755299b4-4b19-4fcd-a371-34a5aa15db7d" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentToBePaidYearsOneThroughThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_32631f58-0cf3-4582-9683-1c0f39ba45df" xlink:to="loc_wynn_OtherCommitmentToBePaidYearsOneThroughThree_755299b4-4b19-4fcd-a371-34a5aa15db7d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentToBePaidYearsFourThroughTen_afb14761-c2cd-45a2-a608-c27ec64b549c" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentToBePaidYearsFourThroughTen"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_32631f58-0cf3-4582-9683-1c0f39ba45df" xlink:to="loc_wynn_OtherCommitmentToBePaidYearsFourThroughTen_afb14761-c2cd-45a2-a608-c27ec64b549c" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/GoodwillandIntangibleAssetsnetScheduleofIntangibleAssetsNetDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#GoodwillandIntangibleAssetsnetScheduleofIntangibleAssetsNetDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/GoodwillandIntangibleAssetsnetScheduleofIntangibleAssetsNetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_wynn_IntangibleAssetsLineItems_b84b7349-a6e7-4eff-ab57-f7196aa14048" xlink:href="wynn-20231231.xsd#wynn_IntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_ScheduleOfIntangibleAssetsTable_a27ed517-0db7-403f-afc1-f7ccf30bc8f0" xlink:href="wynn-20231231.xsd#wynn_ScheduleOfIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_wynn_IntangibleAssetsLineItems_b84b7349-a6e7-4eff-ab57-f7196aa14048" xlink:to="loc_wynn_ScheduleOfIntangibleAssetsTable_a27ed517-0db7-403f-afc1-f7ccf30bc8f0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_8f9cc58d-f114-4cb4-8537-97be7349aef1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_ScheduleOfIntangibleAssetsTable_a27ed517-0db7-403f-afc1-f7ccf30bc8f0" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_8f9cc58d-f114-4cb4-8537-97be7349aef1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_8f9cc58d-f114-4cb4-8537-97be7349aef1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_8f9cc58d-f114-4cb4-8537-97be7349aef1" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_8f9cc58d-f114-4cb4-8537-97be7349aef1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_442a1127-79d7-4bfb-9ff9-b74db400e301" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_8f9cc58d-f114-4cb4-8537-97be7349aef1" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_442a1127-79d7-4bfb-9ff9-b74db400e301" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WaterRightsAndOtherMember_3d3b428e-7293-49be-a6f1-a6baa3cbdbb0" xlink:href="wynn-20231231.xsd#wynn_WaterRightsAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_442a1127-79d7-4bfb-9ff9-b74db400e301" xlink:to="loc_wynn_WaterRightsAndOtherMember_3d3b428e-7293-49be-a6f1-a6baa3cbdbb0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_3947c948-8b3e-4575-b4b1-d2f2299716b5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_ScheduleOfIntangibleAssetsTable_a27ed517-0db7-403f-afc1-f7ccf30bc8f0" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_3947c948-8b3e-4575-b4b1-d2f2299716b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_3947c948-8b3e-4575-b4b1-d2f2299716b5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_3947c948-8b3e-4575-b4b1-d2f2299716b5" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_3947c948-8b3e-4575-b4b1-d2f2299716b5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_174a63f8-23c8-4865-ab5c-6316f37a6f3d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_3947c948-8b3e-4575-b4b1-d2f2299716b5" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_174a63f8-23c8-4865-ab5c-6316f37a6f3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_MacauGamingConcessionMember_4999b3ac-c7a8-48ea-b33c-0b8c70a8627d" xlink:href="wynn-20231231.xsd#wynn_MacauGamingConcessionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_174a63f8-23c8-4865-ab5c-6316f37a6f3d" xlink:to="loc_wynn_MacauGamingConcessionMember_4999b3ac-c7a8-48ea-b33c-0b8c70a8627d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_MassachusettsGamingLicenseMember_2cb95e2e-c9b2-4a4a-8dc9-2bc4b5c1b7de" xlink:href="wynn-20231231.xsd#wynn_MassachusettsGamingLicenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_174a63f8-23c8-4865-ab5c-6316f37a6f3d" xlink:to="loc_wynn_MassachusettsGamingLicenseMember_2cb95e2e-c9b2-4a4a-8dc9-2bc4b5c1b7de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_9d693d25-33ad-4d08-802e-e2a5bd3e7bbf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_174a63f8-23c8-4865-ab5c-6316f37a6f3d" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_9d693d25-33ad-4d08-802e-e2a5bd3e7bbf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_b1cfda78-0b8b-4084-be8f-9fcb3caa3d5e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_ScheduleOfIntangibleAssetsTable_a27ed517-0db7-403f-afc1-f7ccf30bc8f0" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_b1cfda78-0b8b-4084-be8f-9fcb3caa3d5e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_b1cfda78-0b8b-4084-be8f-9fcb3caa3d5e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_b1cfda78-0b8b-4084-be8f-9fcb3caa3d5e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_b1cfda78-0b8b-4084-be8f-9fcb3caa3d5e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_052e35c6-65e1-4461-b8ff-974297d7c045" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_b1cfda78-0b8b-4084-be8f-9fcb3caa3d5e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_052e35c6-65e1-4461-b8ff-974297d7c045" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_BetbullTransactionMember_0d7a7359-716a-43ed-8719-f503fcea02e8" xlink:href="wynn-20231231.xsd#wynn_BetbullTransactionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_052e35c6-65e1-4461-b8ff-974297d7c045" xlink:to="loc_wynn_BetbullTransactionMember_0d7a7359-716a-43ed-8719-f503fcea02e8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_c44f91bd-c1b3-4643-91f7-4b765995f1f6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_IntangibleAssetsLineItems_b84b7349-a6e7-4eff-ab57-f7196aa14048" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_c44f91bd-c1b3-4643-91f7-4b765995f1f6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_6b6c8100-071e-4712-9c5f-f099a84856dd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_IntangibleAssetsLineItems_b84b7349-a6e7-4eff-ab57-f7196aa14048" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_6b6c8100-071e-4712-9c5f-f099a84856dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_cde76989-9780-454e-b6d6-20df803e7fe4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_IntangibleAssetsLineItems_b84b7349-a6e7-4eff-ab57-f7196aa14048" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_cde76989-9780-454e-b6d6-20df803e7fe4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_4073391f-9a08-4f8a-8019-45e1a1b67115" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_IntangibleAssetsLineItems_b84b7349-a6e7-4eff-ab57-f7196aa14048" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_4073391f-9a08-4f8a-8019-45e1a1b67115" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_f632799d-28ca-40f4-b565-6cb5ac248616" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_IntangibleAssetsLineItems_b84b7349-a6e7-4eff-ab57-f7196aa14048" xlink:to="loc_us-gaap_GoodwillRollForward_f632799d-28ca-40f4-b565-6cb5ac248616" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_221e792c-6e7e-43a5-8ffb-ffbcbbb14676" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_f632799d-28ca-40f4-b565-6cb5ac248616" xlink:to="loc_us-gaap_Goodwill_221e792c-6e7e-43a5-8ffb-ffbcbbb14676" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_7ab8066f-c7fe-4708-8fad-6c3e9f0f5014" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_f632799d-28ca-40f4-b565-6cb5ac248616" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_7ab8066f-c7fe-4708-8fad-6c3e9f0f5014" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_d6a97f6f-7c23-4f8b-9294-0e8360680f91" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_f632799d-28ca-40f4-b565-6cb5ac248616" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_d6a97f6f-7c23-4f8b-9294-0e8360680f91" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_c6f33a95-e852-4f93-9d89-ea76f24484b4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Goodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_8ea716e5-c7ed-469f-b036-7736fedc613f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IntangibleAssetsNetIncludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_IntangibleAssetsLineItems_b84b7349-a6e7-4eff-ab57-f7196aa14048" xlink:to="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_8ea716e5-c7ed-469f-b036-7736fedc613f" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/GoodwillandIntangibleAssetsnetAdditionalInformationDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#GoodwillandIntangibleAssetsnetAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/GoodwillandIntangibleAssetsnetAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsLineItems_d73edd77-5457-4b18-9dc7-aa12fda47d75" xlink:href="wynn-20231231.xsd#wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsTable_5e4f0d3a-8f6a-4a76-ad27-0f50b2e8d02d" xlink:href="wynn-20231231.xsd#wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsLineItems_d73edd77-5457-4b18-9dc7-aa12fda47d75" xlink:to="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsTable_5e4f0d3a-8f6a-4a76-ad27-0f50b2e8d02d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_47162a1c-b06b-4c81-b7b4-e3f2d76ba85e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsTable_5e4f0d3a-8f6a-4a76-ad27-0f50b2e8d02d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_47162a1c-b06b-4c81-b7b4-e3f2d76ba85e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_47162a1c-b06b-4c81-b7b4-e3f2d76ba85e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_47162a1c-b06b-4c81-b7b4-e3f2d76ba85e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_47162a1c-b06b-4c81-b7b4-e3f2d76ba85e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_11350422-f2c3-424a-a7ad-64f6b5e3f4e0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_47162a1c-b06b-4c81-b7b4-e3f2d76ba85e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_11350422-f2c3-424a-a7ad-64f6b5e3f4e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_MassachusettsGamingLicenseMember_25946dd4-fb18-45be-af60-88819c78eeb2" xlink:href="wynn-20231231.xsd#wynn_MassachusettsGamingLicenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_11350422-f2c3-424a-a7ad-64f6b5e3f4e0" xlink:to="loc_wynn_MassachusettsGamingLicenseMember_25946dd4-fb18-45be-af60-88819c78eeb2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_57c153d4-e6ce-4d8f-883a-3054ab51cc41" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_11350422-f2c3-424a-a7ad-64f6b5e3f4e0" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_57c153d4-e6ce-4d8f-883a-3054ab51cc41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_3be3f6d3-ca04-4357-9af8-102ea1926f77" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsTable_5e4f0d3a-8f6a-4a76-ad27-0f50b2e8d02d" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_3be3f6d3-ca04-4357-9af8-102ea1926f77" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3be3f6d3-ca04-4357-9af8-102ea1926f77_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_3be3f6d3-ca04-4357-9af8-102ea1926f77" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3be3f6d3-ca04-4357-9af8-102ea1926f77_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9cd63ce8-8697-4429-a274-583b9244fb68" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_3be3f6d3-ca04-4357-9af8-102ea1926f77" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9cd63ce8-8697-4429-a274-583b9244fb68" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_BetbullTransactionMember_06927b8c-17f1-4f82-80a9-0336fe701a95" xlink:href="wynn-20231231.xsd#wynn_BetbullTransactionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9cd63ce8-8697-4429-a274-583b9244fb68" xlink:to="loc_wynn_BetbullTransactionMember_06927b8c-17f1-4f82-80a9-0336fe701a95" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_82922fb2-1c01-4445-adf6-8914bcb02622" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCommitmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsTable_5e4f0d3a-8f6a-4a76-ad27-0f50b2e8d02d" xlink:to="loc_us-gaap_OtherCommitmentsAxis_82922fb2-1c01-4445-adf6-8914bcb02622" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_82922fb2-1c01-4445-adf6-8914bcb02622_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_82922fb2-1c01-4445-adf6-8914bcb02622" xlink:to="loc_us-gaap_OtherCommitmentsDomain_82922fb2-1c01-4445-adf6-8914bcb02622_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_20c33d4d-92e5-4194-a819-a07bc900d0d6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_82922fb2-1c01-4445-adf6-8914bcb02622" xlink:to="loc_us-gaap_OtherCommitmentsDomain_20c33d4d-92e5-4194-a819-a07bc900d0d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_MacauGamingAndNonGamingInvestmentsMember_9c9be32c-de6d-4050-9ab4-e7e75f75a3ba" xlink:href="wynn-20231231.xsd#wynn_MacauGamingAndNonGamingInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_20c33d4d-92e5-4194-a819-a07bc900d0d6" xlink:to="loc_wynn_MacauGamingAndNonGamingInvestmentsMember_9c9be32c-de6d-4050-9ab4-e7e75f75a3ba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_MacauGamingConcessionMember_e3c534ec-90d4-44f4-8b38-47eeb55f6fab" xlink:href="wynn-20231231.xsd#wynn_MacauGamingConcessionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_20c33d4d-92e5-4194-a819-a07bc900d0d6" xlink:to="loc_wynn_MacauGamingConcessionMember_e3c534ec-90d4-44f4-8b38-47eeb55f6fab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_1b2f535d-25cb-420f-a993-ba9b7dc0eb84" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsTable_5e4f0d3a-8f6a-4a76-ad27-0f50b2e8d02d" xlink:to="loc_dei_LegalEntityAxis_1b2f535d-25cb-420f-a993-ba9b7dc0eb84" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_1b2f535d-25cb-420f-a993-ba9b7dc0eb84_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_1b2f535d-25cb-420f-a993-ba9b7dc0eb84" xlink:to="loc_dei_EntityDomain_1b2f535d-25cb-420f-a993-ba9b7dc0eb84_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_1884d877-63e0-4002-a332-2607f24c8200" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_1b2f535d-25cb-420f-a993-ba9b7dc0eb84" xlink:to="loc_dei_EntityDomain_1884d877-63e0-4002-a332-2607f24c8200" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnMacauSAMember_263d23af-0d97-4d35-9d32-1c4fa1f4d537" xlink:href="wynn-20231231.xsd#wynn_WynnMacauSAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_1884d877-63e0-4002-a332-2607f24c8200" xlink:to="loc_wynn_WynnMacauSAMember_263d23af-0d97-4d35-9d32-1c4fa1f4d537" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentScenarioAxis_59d34e02-ded0-4a87-9b7a-8d7af3c0078c" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsTable_5e4f0d3a-8f6a-4a76-ad27-0f50b2e8d02d" xlink:to="loc_wynn_OtherCommitmentScenarioAxis_59d34e02-ded0-4a87-9b7a-8d7af3c0078c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentScenarioDomain_59d34e02-ded0-4a87-9b7a-8d7af3c0078c_default" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_wynn_OtherCommitmentScenarioAxis_59d34e02-ded0-4a87-9b7a-8d7af3c0078c" xlink:to="loc_wynn_OtherCommitmentScenarioDomain_59d34e02-ded0-4a87-9b7a-8d7af3c0078c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentScenarioDomain_ca43b1e4-28fc-4060-b418-2a247bac2413" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_wynn_OtherCommitmentScenarioAxis_59d34e02-ded0-4a87-9b7a-8d7af3c0078c" xlink:to="loc_wynn_OtherCommitmentScenarioDomain_ca43b1e4-28fc-4060-b418-2a247bac2413" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentScenarioOneMember_2c01d545-5bcf-49d8-919c-5aba3c5853c1" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentScenarioOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_OtherCommitmentScenarioDomain_ca43b1e4-28fc-4060-b418-2a247bac2413" xlink:to="loc_wynn_OtherCommitmentScenarioOneMember_2c01d545-5bcf-49d8-919c-5aba3c5853c1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentScenarioTwoMember_15507a3a-c978-4ddf-b9f0-e0455059f29c" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentScenarioTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_OtherCommitmentScenarioDomain_ca43b1e4-28fc-4060-b418-2a247bac2413" xlink:to="loc_wynn_OtherCommitmentScenarioTwoMember_15507a3a-c978-4ddf-b9f0-e0455059f29c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentScenarioThreeMember_f4d5e20f-768f-4129-8b0b-a0d20df5f7b1" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentScenarioThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_OtherCommitmentScenarioDomain_ca43b1e4-28fc-4060-b418-2a247bac2413" xlink:to="loc_wynn_OtherCommitmentScenarioThreeMember_f4d5e20f-768f-4129-8b0b-a0d20df5f7b1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_14614f50-7a1e-4aff-8723-4656cd993cde" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsLineItems_d73edd77-5457-4b18-9dc7-aa12fda47d75" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_14614f50-7a1e-4aff-8723-4656cd993cde" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FiniteLivedIntangibleAssetsAnnualAmortizationExpenseExcludingFinalYear_74824535-b59d-4bb5-b062-1bfd78578948" xlink:href="wynn-20231231.xsd#wynn_FiniteLivedIntangibleAssetsAnnualAmortizationExpenseExcludingFinalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsLineItems_d73edd77-5457-4b18-9dc7-aa12fda47d75" xlink:to="loc_wynn_FiniteLivedIntangibleAssetsAnnualAmortizationExpenseExcludingFinalYear_74824535-b59d-4bb5-b062-1bfd78578948" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FiniteLivedIntangibleAssetsAmortizationExpenseFinalYear_25708777-e713-4610-9331-892af923569f" xlink:href="wynn-20231231.xsd#wynn_FiniteLivedIntangibleAssetsAmortizationExpenseFinalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsLineItems_d73edd77-5457-4b18-9dc7-aa12fda47d75" xlink:to="loc_wynn_FiniteLivedIntangibleAssetsAmortizationExpenseFinalYear_25708777-e713-4610-9331-892af923569f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_2cb517a1-0cca-4a86-9bad-9c480595aa7a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsLineItems_d73edd77-5457-4b18-9dc7-aa12fda47d75" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_2cb517a1-0cca-4a86-9bad-9c480595aa7a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_f00ccbeb-217e-4c7c-844a-c0358bc71505" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsLineItems_d73edd77-5457-4b18-9dc7-aa12fda47d75" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_f00ccbeb-217e-4c7c-844a-c0358bc71505" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_3eeafd56-f51e-4ba4-ba82-e66e5d4451f7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsLineItems_d73edd77-5457-4b18-9dc7-aa12fda47d75" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_3eeafd56-f51e-4ba4-ba82-e66e5d4451f7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_13d762f9-7e3d-4ab4-8592-3f27bc5226a5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsLineItems_d73edd77-5457-4b18-9dc7-aa12fda47d75" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_13d762f9-7e3d-4ab4-8592-3f27bc5226a5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_91d60452-aa2f-4108-9fe7-c4531970f38f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsLineItems_d73edd77-5457-4b18-9dc7-aa12fda47d75" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_91d60452-aa2f-4108-9fe7-c4531970f38f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_9882d1e2-f590-4df2-9b97-a08ce177eea8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsLineItems_d73edd77-5457-4b18-9dc7-aa12fda47d75" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_9882d1e2-f590-4df2-9b97-a08ce177eea8" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_f257a7f1-b6b6-4f64-95c3-b9515d913a13" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsLineItems_d73edd77-5457-4b18-9dc7-aa12fda47d75" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_f257a7f1-b6b6-4f64-95c3-b9515d913a13" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_7eb3a817-08a5-4dbb-ace8-a9002a2dc35c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ImpairmentOfIntangibleAssetsFinitelived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsLineItems_d73edd77-5457-4b18-9dc7-aa12fda47d75" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_7eb3a817-08a5-4dbb-ace8-a9002a2dc35c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetFiniteLivedStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_63720ed1-18f0-4e44-b39e-248a9bb4820e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ImpairmentOfIntangibleAssetFiniteLivedStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_7eb3a817-08a5-4dbb-ace8-a9002a2dc35c" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetFiniteLivedStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_63720ed1-18f0-4e44-b39e-248a9bb4820e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentTerm_85663571-80ff-4da0-977c-46d0291b9400" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsLineItems_d73edd77-5457-4b18-9dc7-aa12fda47d75" xlink:to="loc_wynn_OtherCommitmentTerm_85663571-80ff-4da0-977c-46d0291b9400" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentFixedPortion_174325ff-c0a6-4a07-9445-ea55124954f9" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentFixedPortion"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsLineItems_d73edd77-5457-4b18-9dc7-aa12fda47d75" xlink:to="loc_wynn_OtherCommitmentFixedPortion_174325ff-c0a6-4a07-9445-ea55124954f9" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentVariablePortion_701f738d-828d-4de0-98ad-59c38a5b27f8" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentVariablePortion"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsLineItems_d73edd77-5457-4b18-9dc7-aa12fda47d75" xlink:to="loc_wynn_OtherCommitmentVariablePortion_701f738d-828d-4de0-98ad-59c38a5b27f8" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentGamingPremiumNumberOfGamingTablesMinimum_f302ce9b-7350-4ef7-b36d-629987de3487" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentGamingPremiumNumberOfGamingTablesMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsLineItems_d73edd77-5457-4b18-9dc7-aa12fda47d75" xlink:to="loc_wynn_OtherCommitmentGamingPremiumNumberOfGamingTablesMinimum_f302ce9b-7350-4ef7-b36d-629987de3487" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentGamingPremiumNumberOfGamingMachinesMinimum_ec65b892-8782-49e6-ac28-fabbc605e1b6" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentGamingPremiumNumberOfGamingMachinesMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsLineItems_d73edd77-5457-4b18-9dc7-aa12fda47d75" xlink:to="loc_wynn_OtherCommitmentGamingPremiumNumberOfGamingMachinesMinimum_ec65b892-8782-49e6-ac28-fabbc605e1b6" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentGamingPremiumVariableMinimum_6ec4e9d6-bdf3-4669-951d-62948317c627" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentGamingPremiumVariableMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsLineItems_d73edd77-5457-4b18-9dc7-aa12fda47d75" xlink:to="loc_wynn_OtherCommitmentGamingPremiumVariableMinimum_6ec4e9d6-bdf3-4669-951d-62948317c627" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentToBePaidYearsOneThroughThree_aaff9e65-9b51-4e51-844a-d544d9116b46" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentToBePaidYearsOneThroughThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsLineItems_d73edd77-5457-4b18-9dc7-aa12fda47d75" xlink:to="loc_wynn_OtherCommitmentToBePaidYearsOneThroughThree_aaff9e65-9b51-4e51-844a-d544d9116b46" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentToBePaidYearsFourThroughTen_ed627083-4f01-47ca-8f91-e2b24bf854f5" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentToBePaidYearsFourThroughTen"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsLineItems_d73edd77-5457-4b18-9dc7-aa12fda47d75" xlink:to="loc_wynn_OtherCommitmentToBePaidYearsFourThroughTen_ed627083-4f01-47ca-8f91-e2b24bf854f5" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FinancialLiabilityRelatedToGamingConcession_90800d2a-71c8-4fd3-b363-56deb34c0456" xlink:href="wynn-20231231.xsd#wynn_FinancialLiabilityRelatedToGamingConcession"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsLineItems_d73edd77-5457-4b18-9dc7-aa12fda47d75" xlink:to="loc_wynn_FinancialLiabilityRelatedToGamingConcession_90800d2a-71c8-4fd3-b363-56deb34c0456" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FiniteLivedIntangibleAssetExpectedAmortizationYearsOneThroughNine_e06575a5-390c-44b5-b91b-11a26ca88c66" xlink:href="wynn-20231231.xsd#wynn_FiniteLivedIntangibleAssetExpectedAmortizationYearsOneThroughNine"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsLineItems_d73edd77-5457-4b18-9dc7-aa12fda47d75" xlink:to="loc_wynn_FiniteLivedIntangibleAssetExpectedAmortizationYearsOneThroughNine_e06575a5-390c-44b5-b91b-11a26ca88c66" xlink:type="arc" order="20"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/LongTermDebtSummaryofLongTermDebtDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#LongTermDebtSummaryofLongTermDebtDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/LongTermDebtSummaryofLongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_65390364-37e6-4efe-923d-136fd116fb3a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_59ba23e4-426a-4981-923d-048c1828ef4e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_65390364-37e6-4efe-923d-136fd116fb3a" xlink:to="loc_us-gaap_DebtInstrumentTable_59ba23e4-426a-4981-923d-048c1828ef4e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_b6be8e27-2470-46cb-b570-125da9888505" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_59ba23e4-426a-4981-923d-048c1828ef4e" xlink:to="loc_dei_LegalEntityAxis_b6be8e27-2470-46cb-b570-125da9888505" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_b6be8e27-2470-46cb-b570-125da9888505_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_b6be8e27-2470-46cb-b570-125da9888505" xlink:to="loc_dei_EntityDomain_b6be8e27-2470-46cb-b570-125da9888505_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_6ecbd165-a33d-4809-b2fb-59cda1b844f4" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_b6be8e27-2470-46cb-b570-125da9888505" xlink:to="loc_dei_EntityDomain_6ecbd165-a33d-4809-b2fb-59cda1b844f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WMCaymanHoldingsLimitedIIMember_f6cb3e38-8df5-41be-afc2-1e8477190645" xlink:href="wynn-20231231.xsd#wynn_WMCaymanHoldingsLimitedIIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_6ecbd165-a33d-4809-b2fb-59cda1b844f4" xlink:to="loc_wynn_WMCaymanHoldingsLimitedIIMember_f6cb3e38-8df5-41be-afc2-1e8477190645" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnMacauLimitedMember_05a186ca-d070-4796-9c04-85e418f7a169" xlink:href="wynn-20231231.xsd#wynn_WynnMacauLimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_6ecbd165-a33d-4809-b2fb-59cda1b844f4" xlink:to="loc_wynn_WynnMacauLimitedMember_05a186ca-d070-4796-9c04-85e418f7a169" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnResortsFinanceLLCMember_53f906f7-b499-4dbd-ac3e-2a205a33cae5" xlink:href="wynn-20231231.xsd#wynn_WynnResortsFinanceLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_6ecbd165-a33d-4809-b2fb-59cda1b844f4" xlink:to="loc_wynn_WynnResortsFinanceLLCMember_53f906f7-b499-4dbd-ac3e-2a205a33cae5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnLasVegasLLCandWynnLasVegasCapitalCorpMember_b6eba8a7-4f64-4ed9-aa39-b34d8d31f662" xlink:href="wynn-20231231.xsd#wynn_WynnLasVegasLLCandWynnLasVegasCapitalCorpMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_6ecbd165-a33d-4809-b2fb-59cda1b844f4" xlink:to="loc_wynn_WynnLasVegasLLCandWynnLasVegasCapitalCorpMember_b6eba8a7-4f64-4ed9-aa39-b34d8d31f662" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnCAPlazaPropertyOwnerLLCAndWynnCAPropertyOwnerLLCMember_038292cf-608d-4d98-bc78-0681da36a473" xlink:href="wynn-20231231.xsd#wynn_WynnCAPlazaPropertyOwnerLLCAndWynnCAPropertyOwnerLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_6ecbd165-a33d-4809-b2fb-59cda1b844f4" xlink:to="loc_wynn_WynnCAPlazaPropertyOwnerLLCAndWynnCAPropertyOwnerLLCMember_038292cf-608d-4d98-bc78-0681da36a473" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_998c683f-2dca-493b-88f9-d0412eeeea6a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_59ba23e4-426a-4981-923d-048c1828ef4e" xlink:to="loc_us-gaap_DebtInstrumentAxis_998c683f-2dca-493b-88f9-d0412eeeea6a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_998c683f-2dca-493b-88f9-d0412eeeea6a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_998c683f-2dca-493b-88f9-d0412eeeea6a" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_998c683f-2dca-493b-88f9-d0412eeeea6a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_158242f8-aefa-415c-a727-6aa297bbc1ca" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_998c683f-2dca-493b-88f9-d0412eeeea6a" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_158242f8-aefa-415c-a727-6aa297bbc1ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WMCaymanIIRevolverDue2025Member_bed47d36-7fe9-476b-8003-6159d46b2e9c" xlink:href="wynn-20231231.xsd#wynn_WMCaymanIIRevolverDue2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_158242f8-aefa-415c-a727-6aa297bbc1ca" xlink:to="loc_wynn_WMCaymanIIRevolverDue2025Member_bed47d36-7fe9-476b-8003-6159d46b2e9c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FourandSevenOverEightPercentageWynnMacauLimitedSeniorNotesDueOctoberOneTwoThousandTwentyFourMember_2288f1c4-14e3-4f6e-a6e1-63dfa20f74db" xlink:href="wynn-20231231.xsd#wynn_FourandSevenOverEightPercentageWynnMacauLimitedSeniorNotesDueOctoberOneTwoThousandTwentyFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_158242f8-aefa-415c-a727-6aa297bbc1ca" xlink:to="loc_wynn_FourandSevenOverEightPercentageWynnMacauLimitedSeniorNotesDueOctoberOneTwoThousandTwentyFourMember_2288f1c4-14e3-4f6e-a6e1-63dfa20f74db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FiveAndOneOverTwoPercentageWynnMacauLimitedSeniorNotesDueTwoThousandTwentySixMember_32c288ad-eb38-421b-95e0-7d0a0283f1de" xlink:href="wynn-20231231.xsd#wynn_FiveAndOneOverTwoPercentageWynnMacauLimitedSeniorNotesDueTwoThousandTwentySixMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_158242f8-aefa-415c-a727-6aa297bbc1ca" xlink:to="loc_wynn_FiveAndOneOverTwoPercentageWynnMacauLimitedSeniorNotesDueTwoThousandTwentySixMember_32c288ad-eb38-421b-95e0-7d0a0283f1de" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FiveAndOneOverTwoPercentageWynnMacauLimitedSeniorNotesDueOctoberOneTwoThousandTwentySevenMember_56fea0fe-ee15-48ef-b4fd-e55749c55e76" xlink:href="wynn-20231231.xsd#wynn_FiveAndOneOverTwoPercentageWynnMacauLimitedSeniorNotesDueOctoberOneTwoThousandTwentySevenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_158242f8-aefa-415c-a727-6aa297bbc1ca" xlink:to="loc_wynn_FiveAndOneOverTwoPercentageWynnMacauLimitedSeniorNotesDueOctoberOneTwoThousandTwentySevenMember_56fea0fe-ee15-48ef-b4fd-e55749c55e76" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FiveAndFiveOverEightPercentageWynnMacauLimitedSeniorNotesDueTwoThousandTwentyEightMember_3270163e-d0a6-49c0-8dc3-463f48177f5a" xlink:href="wynn-20231231.xsd#wynn_FiveAndFiveOverEightPercentageWynnMacauLimitedSeniorNotesDueTwoThousandTwentyEightMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_158242f8-aefa-415c-a727-6aa297bbc1ca" xlink:to="loc_wynn_FiveAndFiveOverEightPercentageWynnMacauLimitedSeniorNotesDueTwoThousandTwentyEightMember_3270163e-d0a6-49c0-8dc3-463f48177f5a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FiveAndOneOverEightPercentageWynnMacauLimitedSeniorNotesDueTwoThousandTwentyNineMember_e9764d37-28c8-4c2d-a2dd-c7ef41f32c2f" xlink:href="wynn-20231231.xsd#wynn_FiveAndOneOverEightPercentageWynnMacauLimitedSeniorNotesDueTwoThousandTwentyNineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_158242f8-aefa-415c-a727-6aa297bbc1ca" xlink:to="loc_wynn_FiveAndOneOverEightPercentageWynnMacauLimitedSeniorNotesDueTwoThousandTwentyNineMember_e9764d37-28c8-4c2d-a2dd-c7ef41f32c2f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FourAndOneOverTwoPercentageWynnMacauLimitedConvertibleBondsDueTwoThousandTwentyNineMember_5226e1af-bb8b-4025-af38-eca96569b89d" xlink:href="wynn-20231231.xsd#wynn_FourAndOneOverTwoPercentageWynnMacauLimitedConvertibleBondsDueTwoThousandTwentyNineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_158242f8-aefa-415c-a727-6aa297bbc1ca" xlink:to="loc_wynn_FourAndOneOverTwoPercentageWynnMacauLimitedConvertibleBondsDueTwoThousandTwentyNineMember_5226e1af-bb8b-4025-af38-eca96569b89d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WRFSeniorSecuredCreditFacilitiesMember_c9d62616-a862-473f-819a-a359e11302da" xlink:href="wynn-20231231.xsd#wynn_WRFSeniorSecuredCreditFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_158242f8-aefa-415c-a727-6aa297bbc1ca" xlink:to="loc_wynn_WRFSeniorSecuredCreditFacilitiesMember_c9d62616-a862-473f-819a-a359e11302da" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_SeniorTermLoanFacilityDue2024Member_67482145-e15a-4f98-8512-3b8a9ebb412c" xlink:href="wynn-20231231.xsd#wynn_SeniorTermLoanFacilityDue2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_WRFSeniorSecuredCreditFacilitiesMember_c9d62616-a862-473f-819a-a359e11302da" xlink:to="loc_wynn_SeniorTermLoanFacilityDue2024Member_67482145-e15a-4f98-8512-3b8a9ebb412c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_SeniorTermLoanFacilityDue2027Member_5db2c458-ccaf-4814-a96e-e08cfaa710b4" xlink:href="wynn-20231231.xsd#wynn_SeniorTermLoanFacilityDue2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_WRFSeniorSecuredCreditFacilitiesMember_c9d62616-a862-473f-819a-a359e11302da" xlink:to="loc_wynn_SeniorTermLoanFacilityDue2027Member_5db2c458-ccaf-4814-a96e-e08cfaa710b4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FourAndOneOverFourPercentageWynnLasVegasSeniorNotesDueMayThirtyTwoThousandTwentyThreeMember_e62623ff-c8e7-4b7b-a1b1-a5f5f782e7aa" xlink:href="wynn-20231231.xsd#wynn_FourAndOneOverFourPercentageWynnLasVegasSeniorNotesDueMayThirtyTwoThousandTwentyThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_158242f8-aefa-415c-a727-6aa297bbc1ca" xlink:to="loc_wynn_FourAndOneOverFourPercentageWynnLasVegasSeniorNotesDueMayThirtyTwoThousandTwentyThreeMember_e62623ff-c8e7-4b7b-a1b1-a5f5f782e7aa" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FiveandOneHalfPercentSeniorNotesDueMarchOneTwentyTwentyFiveMember_0fe179f8-8100-45c4-a448-97865abcb8ec" xlink:href="wynn-20231231.xsd#wynn_FiveandOneHalfPercentSeniorNotesDueMarchOneTwentyTwentyFiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_158242f8-aefa-415c-a727-6aa297bbc1ca" xlink:to="loc_wynn_FiveandOneHalfPercentSeniorNotesDueMarchOneTwentyTwentyFiveMember_0fe179f8-8100-45c4-a448-97865abcb8ec" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FiveAndOneOverFourPercentageSeniorNotesDueMay152027Member_b7568ea8-ea74-47f6-8115-9becf48f2948" xlink:href="wynn-20231231.xsd#wynn_FiveAndOneOverFourPercentageSeniorNotesDueMay152027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_158242f8-aefa-415c-a727-6aa297bbc1ca" xlink:to="loc_wynn_FiveAndOneOverFourPercentageSeniorNotesDueMay152027Member_b7568ea8-ea74-47f6-8115-9becf48f2948" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_SevenAndThreeOverFourPercentageWRFSeniorNotesDue2025Member_313e3a29-d02c-4300-baa6-c8e029893c93" xlink:href="wynn-20231231.xsd#wynn_SevenAndThreeOverFourPercentageWRFSeniorNotesDue2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_158242f8-aefa-415c-a727-6aa297bbc1ca" xlink:to="loc_wynn_SevenAndThreeOverFourPercentageWRFSeniorNotesDue2025Member_313e3a29-d02c-4300-baa6-c8e029893c93" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FiveAndOneOverEightPercentageSeniorNotesDue2029Member_d93f4b6d-5f7d-4ffa-879b-d60f2204c3f9" xlink:href="wynn-20231231.xsd#wynn_FiveAndOneOverEightPercentageSeniorNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_158242f8-aefa-415c-a727-6aa297bbc1ca" xlink:to="loc_wynn_FiveAndOneOverEightPercentageSeniorNotesDue2029Member_d93f4b6d-5f7d-4ffa-879b-d60f2204c3f9" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_SevenAndOneOverEightPercentageSeniorNotesDue2031Member_5396f014-7713-4257-99e0-09c01f020f0d" xlink:href="wynn-20231231.xsd#wynn_SevenAndOneOverEightPercentageSeniorNotesDue2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_158242f8-aefa-415c-a727-6aa297bbc1ca" xlink:to="loc_wynn_SevenAndOneOverEightPercentageSeniorNotesDue2031Member_5396f014-7713-4257-99e0-09c01f020f0d" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_RetailTermLoanAgreementMember_1f01d036-5b19-412d-84e2-fb2b05b7e3c9" xlink:href="wynn-20231231.xsd#wynn_RetailTermLoanAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_158242f8-aefa-415c-a727-6aa297bbc1ca" xlink:to="loc_wynn_RetailTermLoanAgreementMember_1f01d036-5b19-412d-84e2-fb2b05b7e3c9" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_47595d50-2fd3-47c5-bdee-4143f34ea263" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_59ba23e4-426a-4981-923d-048c1828ef4e" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_47595d50-2fd3-47c5-bdee-4143f34ea263" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_47595d50-2fd3-47c5-bdee-4143f34ea263_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_47595d50-2fd3-47c5-bdee-4143f34ea263" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_47595d50-2fd3-47c5-bdee-4143f34ea263_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_564b7087-afaf-4390-981a-c113cdc8b8a3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_47595d50-2fd3-47c5-bdee-4143f34ea263" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_564b7087-afaf-4390-981a-c113cdc8b8a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_af6daee1-c5eb-44e1-9204-299d6385c8a7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_564b7087-afaf-4390-981a-c113cdc8b8a3" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_af6daee1-c5eb-44e1-9204-299d6385c8a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_8d7d27b4-6578-4553-b659-f0c7bf2e41b6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_564b7087-afaf-4390-981a-c113cdc8b8a3" xlink:to="loc_us-gaap_SeniorNotesMember_8d7d27b4-6578-4553-b659-f0c7bf2e41b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_d468d9a6-4b69-483f-90e9-1ce2653a79b1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_564b7087-afaf-4390-981a-c113cdc8b8a3" xlink:to="loc_us-gaap_ConvertibleDebtMember_d468d9a6-4b69-483f-90e9-1ce2653a79b1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_b0c1e399-41b2-4e64-a2a1-5e8de4ad33ed" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_564b7087-afaf-4390-981a-c113cdc8b8a3" xlink:to="loc_us-gaap_SecuredDebtMember_b0c1e399-41b2-4e64-a2a1-5e8de4ad33ed" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MediumTermNotesMember_82e446c4-5e18-4f29-b603-9a17d09aa5d1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MediumTermNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_564b7087-afaf-4390-981a-c113cdc8b8a3" xlink:to="loc_us-gaap_MediumTermNotesMember_82e446c4-5e18-4f29-b603-9a17d09aa5d1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_9189503f-ac0f-4676-b234-c627d0141d05" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_65390364-37e6-4efe-923d-136fd116fb3a" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_9189503f-ac0f-4676-b234-c627d0141d05" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_afb564db-f6d4-4699-9f8e-b684f246c977" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_65390364-37e6-4efe-923d-136fd116fb3a" xlink:to="loc_us-gaap_DerivativeLiabilities_afb564db-f6d4-4699-9f8e-b684f246c977" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_76722088-f057-434b-8204-3132af7e6ee1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_65390364-37e6-4efe-923d-136fd116fb3a" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_76722088-f057-434b-8204-3132af7e6ee1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_8e696d6d-4f64-4499-b639-b4a618d06995" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_65390364-37e6-4efe-923d-136fd116fb3a" xlink:to="loc_us-gaap_LongTermDebt_8e696d6d-4f64-4499-b639-b4a618d06995" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_b00e301c-8b70-487f-8548-cad5b3ff8175" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_65390364-37e6-4efe-923d-136fd116fb3a" xlink:to="loc_us-gaap_LongTermDebtCurrent_b00e301c-8b70-487f-8548-cad5b3ff8175" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_40fb79a1-35e9-434c-8b9a-51217614cef3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_65390364-37e6-4efe-923d-136fd116fb3a" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_40fb79a1-35e9-434c-8b9a-51217614cef3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_bfd8d867-d390-4192-95a6-b19306066fc2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_65390364-37e6-4efe-923d-136fd116fb3a" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_bfd8d867-d390-4192-95a6-b19306066fc2" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/LongTermDebtSummaryofLongTermDebtAdditionalInformationDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#LongTermDebtSummaryofLongTermDebtAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/LongTermDebtSummaryofLongTermDebtAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_09d606e0-f839-4da9-9e42-3580d5ae130e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_b07c7375-0c48-4a94-88c1-e5f94e6df18d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_09d606e0-f839-4da9-9e42-3580d5ae130e" xlink:to="loc_us-gaap_DebtInstrumentTable_b07c7375-0c48-4a94-88c1-e5f94e6df18d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_aeef20b2-0866-4d3d-b3ca-4808e4a01d70" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_b07c7375-0c48-4a94-88c1-e5f94e6df18d" xlink:to="loc_us-gaap_DebtInstrumentAxis_aeef20b2-0866-4d3d-b3ca-4808e4a01d70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_aeef20b2-0866-4d3d-b3ca-4808e4a01d70_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_aeef20b2-0866-4d3d-b3ca-4808e4a01d70" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_aeef20b2-0866-4d3d-b3ca-4808e4a01d70_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_c0c02917-210f-4b25-9917-1c698834c7ff" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_aeef20b2-0866-4d3d-b3ca-4808e4a01d70" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_c0c02917-210f-4b25-9917-1c698834c7ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WMCaymanIIRevolverDue2025Member_3b2c5a1f-d38f-4b52-b435-a316af011660" xlink:href="wynn-20231231.xsd#wynn_WMCaymanIIRevolverDue2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_c0c02917-210f-4b25-9917-1c698834c7ff" xlink:to="loc_wynn_WMCaymanIIRevolverDue2025Member_3b2c5a1f-d38f-4b52-b435-a316af011660" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FourAndOneOverTwoPercentageWynnMacauLimitedConvertibleBondsDueTwoThousandTwentyNineMember_b3fe07af-e91e-4e98-bee0-e6037a71dc77" xlink:href="wynn-20231231.xsd#wynn_FourAndOneOverTwoPercentageWynnMacauLimitedConvertibleBondsDueTwoThousandTwentyNineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_c0c02917-210f-4b25-9917-1c698834c7ff" xlink:to="loc_wynn_FourAndOneOverTwoPercentageWynnMacauLimitedConvertibleBondsDueTwoThousandTwentyNineMember_b3fe07af-e91e-4e98-bee0-e6037a71dc77" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WRFSeniorSecuredCreditFacilitiesMember_4dcce7f6-ec00-4b2d-bed0-cecacaa09ab0" xlink:href="wynn-20231231.xsd#wynn_WRFSeniorSecuredCreditFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_c0c02917-210f-4b25-9917-1c698834c7ff" xlink:to="loc_wynn_WRFSeniorSecuredCreditFacilitiesMember_4dcce7f6-ec00-4b2d-bed0-cecacaa09ab0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_SeniorRevolvingCreditFacilityDue2024Member_acb526fd-c0f0-49c1-a767-ddbe0a49798e" xlink:href="wynn-20231231.xsd#wynn_SeniorRevolvingCreditFacilityDue2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_c0c02917-210f-4b25-9917-1c698834c7ff" xlink:to="loc_wynn_SeniorRevolvingCreditFacilityDue2024Member_acb526fd-c0f0-49c1-a767-ddbe0a49798e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_RetailTermLoanAgreementMember_0d16c5c4-f365-4aee-8d9c-5267b642b6b8" xlink:href="wynn-20231231.xsd#wynn_RetailTermLoanAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_c0c02917-210f-4b25-9917-1c698834c7ff" xlink:to="loc_wynn_RetailTermLoanAgreementMember_0d16c5c4-f365-4aee-8d9c-5267b642b6b8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_39c1ef6e-9d75-4ef2-b3f1-7986084681b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_b07c7375-0c48-4a94-88c1-e5f94e6df18d" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_39c1ef6e-9d75-4ef2-b3f1-7986084681b2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_39c1ef6e-9d75-4ef2-b3f1-7986084681b2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_39c1ef6e-9d75-4ef2-b3f1-7986084681b2" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_39c1ef6e-9d75-4ef2-b3f1-7986084681b2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_e255d676-d6cb-4676-8c34-6e921198192d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_39c1ef6e-9d75-4ef2-b3f1-7986084681b2" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_e255d676-d6cb-4676-8c34-6e921198192d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_6f57201e-4ffe-4188-8c2b-ba75f707eccc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_e255d676-d6cb-4676-8c34-6e921198192d" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_6f57201e-4ffe-4188-8c2b-ba75f707eccc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_3fb9c58e-15e7-4a2f-acbf-663fd45c54c1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_e255d676-d6cb-4676-8c34-6e921198192d" xlink:to="loc_us-gaap_ConvertibleDebtMember_3fb9c58e-15e7-4a2f-acbf-663fd45c54c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_c6b24b7d-a876-4309-8c46-7dd3ff402d13" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_e255d676-d6cb-4676-8c34-6e921198192d" xlink:to="loc_us-gaap_SecuredDebtMember_c6b24b7d-a876-4309-8c46-7dd3ff402d13" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MediumTermNotesMember_7560d079-9522-41a7-996d-c55257183eab" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MediumTermNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_e255d676-d6cb-4676-8c34-6e921198192d" xlink:to="loc_us-gaap_MediumTermNotesMember_7560d079-9522-41a7-996d-c55257183eab" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_e183e3e0-8e04-4c89-82ea-f07021cdb76d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_b07c7375-0c48-4a94-88c1-e5f94e6df18d" xlink:to="loc_us-gaap_VariableRateAxis_e183e3e0-8e04-4c89-82ea-f07021cdb76d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_e183e3e0-8e04-4c89-82ea-f07021cdb76d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_e183e3e0-8e04-4c89-82ea-f07021cdb76d" xlink:to="loc_us-gaap_VariableRateDomain_e183e3e0-8e04-4c89-82ea-f07021cdb76d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_d0913f08-1cea-4e3b-97c7-1c19e881c48b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_e183e3e0-8e04-4c89-82ea-f07021cdb76d" xlink:to="loc_us-gaap_VariableRateDomain_d0913f08-1cea-4e3b-97c7-1c19e881c48b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_SecuredOvernightFinancingRateSOFRMember_1b100605-ee2f-46d3-9446-30a4fb028910" xlink:href="wynn-20231231.xsd#wynn_SecuredOvernightFinancingRateSOFRMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_d0913f08-1cea-4e3b-97c7-1c19e881c48b" xlink:to="loc_wynn_SecuredOvernightFinancingRateSOFRMember_1b100605-ee2f-46d3-9446-30a4fb028910" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_HIBOROrSOFRMember_47544a14-2521-468c-9e23-fc8c62738611" xlink:href="wynn-20231231.xsd#wynn_HIBOROrSOFRMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_d0913f08-1cea-4e3b-97c7-1c19e881c48b" xlink:to="loc_wynn_HIBOROrSOFRMember_47544a14-2521-468c-9e23-fc8c62738611" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_HIBORMember_e08a76c9-4afb-42b9-8d2d-88527f1053da" xlink:href="wynn-20231231.xsd#wynn_HIBORMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_d0913f08-1cea-4e3b-97c7-1c19e881c48b" xlink:to="loc_wynn_HIBORMember_e08a76c9-4afb-42b9-8d2d-88527f1053da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_0817937c-84d8-4fdd-bfa5-3d408a65643b" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_b07c7375-0c48-4a94-88c1-e5f94e6df18d" xlink:to="loc_dei_LegalEntityAxis_0817937c-84d8-4fdd-bfa5-3d408a65643b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_0817937c-84d8-4fdd-bfa5-3d408a65643b_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_0817937c-84d8-4fdd-bfa5-3d408a65643b" xlink:to="loc_dei_EntityDomain_0817937c-84d8-4fdd-bfa5-3d408a65643b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_cbfd7c3d-ae31-4c7a-a638-f49ff49faa38" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_0817937c-84d8-4fdd-bfa5-3d408a65643b" xlink:to="loc_dei_EntityDomain_cbfd7c3d-ae31-4c7a-a638-f49ff49faa38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WMCaymanHoldingsLimitedIIMember_8299b71b-b4c6-48e4-ac57-fecf0d021af8" xlink:href="wynn-20231231.xsd#wynn_WMCaymanHoldingsLimitedIIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_cbfd7c3d-ae31-4c7a-a638-f49ff49faa38" xlink:to="loc_wynn_WMCaymanHoldingsLimitedIIMember_8299b71b-b4c6-48e4-ac57-fecf0d021af8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnMacauLimitedMember_578c1a04-64b3-4164-9aeb-c6ee766b4f28" xlink:href="wynn-20231231.xsd#wynn_WynnMacauLimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_cbfd7c3d-ae31-4c7a-a638-f49ff49faa38" xlink:to="loc_wynn_WynnMacauLimitedMember_578c1a04-64b3-4164-9aeb-c6ee766b4f28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnResortsFinanceLLCMember_4316d97c-0a64-4178-a1f5-2fb63f588c3e" xlink:href="wynn-20231231.xsd#wynn_WynnResortsFinanceLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_cbfd7c3d-ae31-4c7a-a638-f49ff49faa38" xlink:to="loc_wynn_WynnResortsFinanceLLCMember_4316d97c-0a64-4178-a1f5-2fb63f588c3e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnCAPlazaPropertyOwnerLLCAndWynnCAPropertyOwnerLLCMember_e0a43afe-155f-4cc2-9018-5d052980387b" xlink:href="wynn-20231231.xsd#wynn_WynnCAPlazaPropertyOwnerLLCAndWynnCAPropertyOwnerLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_cbfd7c3d-ae31-4c7a-a638-f49ff49faa38" xlink:to="loc_wynn_WynnCAPlazaPropertyOwnerLLCAndWynnCAPropertyOwnerLLCMember_e0a43afe-155f-4cc2-9018-5d052980387b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_5609fdde-084e-4e5c-9415-c904cef842ce" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_b07c7375-0c48-4a94-88c1-e5f94e6df18d" xlink:to="loc_srt_RangeAxis_5609fdde-084e-4e5c-9415-c904cef842ce" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_5609fdde-084e-4e5c-9415-c904cef842ce_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_5609fdde-084e-4e5c-9415-c904cef842ce" xlink:to="loc_srt_RangeMember_5609fdde-084e-4e5c-9415-c904cef842ce_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_755f8b3d-1d38-48ae-8c8e-4f7f46c3a775" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_5609fdde-084e-4e5c-9415-c904cef842ce" xlink:to="loc_srt_RangeMember_755f8b3d-1d38-48ae-8c8e-4f7f46c3a775" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_787ca37b-242d-48f4-95e8-67abb7dfcdfa" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_755f8b3d-1d38-48ae-8c8e-4f7f46c3a775" xlink:to="loc_srt_MinimumMember_787ca37b-242d-48f4-95e8-67abb7dfcdfa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_7ea99291-281e-42d2-8393-9f5a6f9eeae2" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_755f8b3d-1d38-48ae-8c8e-4f7f46c3a775" xlink:to="loc_srt_MaximumMember_7ea99291-281e-42d2-8393-9f5a6f9eeae2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_5db3821d-7feb-4b78-aa66-5ffb2da2a01d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_09d606e0-f839-4da9-9e42-3580d5ae130e" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_5db3821d-7feb-4b78-aa66-5ffb2da2a01d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_28eb76c8-1e78-4773-bbda-49413d721371" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_09d606e0-f839-4da9-9e42-3580d5ae130e" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_28eb76c8-1e78-4773-bbda-49413d721371" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_1c5451ab-d440-4792-a131-e91fbfb89a2b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_09d606e0-f839-4da9-9e42-3580d5ae130e" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_1c5451ab-d440-4792-a131-e91fbfb89a2b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_4b1ac765-aca8-4972-a967-c075ee6db815" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_09d606e0-f839-4da9-9e42-3580d5ae130e" xlink:to="loc_us-gaap_LongTermDebt_4b1ac765-aca8-4972-a967-c075ee6db815" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_6e497da2-8f9b-46e9-b805-cc3baaacc979" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_09d606e0-f839-4da9-9e42-3580d5ae130e" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_6e497da2-8f9b-46e9-b805-cc3baaacc979" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt_6f4b4671-fc8c-4ea4-89f9-73b2206c2d64" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestExpenseDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_09d606e0-f839-4da9-9e42-3580d5ae130e" xlink:to="loc_us-gaap_InterestExpenseDebt_6f4b4671-fc8c-4ea4-89f9-73b2206c2d64" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_13e6ba75-bdf1-4e7f-94f8-f71f8966629c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AmortizationOfFinancingCostsAndDiscounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_09d606e0-f839-4da9-9e42-3580d5ae130e" xlink:to="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_13e6ba75-bdf1-4e7f-94f8-f71f8966629c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_25217fad-9127-4687-9473-135739766223" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_09d606e0-f839-4da9-9e42-3580d5ae130e" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_25217fad-9127-4687-9473-135739766223" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_965bb35c-09ab-4a40-a34c-780ec7b2b81d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_09d606e0-f839-4da9-9e42-3580d5ae130e" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_965bb35c-09ab-4a40-a34c-780ec7b2b81d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_47d50529-e76b-4b7c-8a3d-13316de7b8a1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_09d606e0-f839-4da9-9e42-3580d5ae130e" xlink:to="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_47d50529-e76b-4b7c-8a3d-13316de7b8a1" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/LongTermDebtWMCaymanIIRevolverDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#LongTermDebtWMCaymanIIRevolverDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/LongTermDebtWMCaymanIIRevolverDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_a0fb4d52-c626-4138-9925-1c3289f4064b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_2b55294e-2b26-465d-8e2c-41fe408b8efd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_a0fb4d52-c626-4138-9925-1c3289f4064b" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_2b55294e-2b26-465d-8e2c-41fe408b8efd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_de2f10e7-e144-4bb3-9c0b-1b0f2d33f9e4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_2b55294e-2b26-465d-8e2c-41fe408b8efd" xlink:to="loc_us-gaap_DebtInstrumentAxis_de2f10e7-e144-4bb3-9c0b-1b0f2d33f9e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_de2f10e7-e144-4bb3-9c0b-1b0f2d33f9e4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_de2f10e7-e144-4bb3-9c0b-1b0f2d33f9e4" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_de2f10e7-e144-4bb3-9c0b-1b0f2d33f9e4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_be641b6d-718f-4f9f-a69a-60168205a4a5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_de2f10e7-e144-4bb3-9c0b-1b0f2d33f9e4" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_be641b6d-718f-4f9f-a69a-60168205a4a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WMCaymanIIRevolverDue2025Member_2d1f937a-0fbd-4c6d-9d0a-a90224ec402a" xlink:href="wynn-20231231.xsd#wynn_WMCaymanIIRevolverDue2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_be641b6d-718f-4f9f-a69a-60168205a4a5" xlink:to="loc_wynn_WMCaymanIIRevolverDue2025Member_2d1f937a-0fbd-4c6d-9d0a-a90224ec402a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WMCaymanIIRevolverDue2025Tranche1Member_4cc0483d-abac-4b2e-9bff-7bd5d7ccb5cc" xlink:href="wynn-20231231.xsd#wynn_WMCaymanIIRevolverDue2025Tranche1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_be641b6d-718f-4f9f-a69a-60168205a4a5" xlink:to="loc_wynn_WMCaymanIIRevolverDue2025Tranche1Member_4cc0483d-abac-4b2e-9bff-7bd5d7ccb5cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WMCaymanIIRevolverDue2025Tranche2Member_253cd6e9-2a4e-4c94-819e-9d8e3ba5ebd8" xlink:href="wynn-20231231.xsd#wynn_WMCaymanIIRevolverDue2025Tranche2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_be641b6d-718f-4f9f-a69a-60168205a4a5" xlink:to="loc_wynn_WMCaymanIIRevolverDue2025Tranche2Member_253cd6e9-2a4e-4c94-819e-9d8e3ba5ebd8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WMCaymanIIRevolverDue2025TrancheOneMember_1224ebbe-ee3e-4190-ab6d-d45f62ee46a1" xlink:href="wynn-20231231.xsd#wynn_WMCaymanIIRevolverDue2025TrancheOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_be641b6d-718f-4f9f-a69a-60168205a4a5" xlink:to="loc_wynn_WMCaymanIIRevolverDue2025TrancheOneMember_1224ebbe-ee3e-4190-ab6d-d45f62ee46a1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WMCaymanIIRevolverDue2025TrancheTwoMember_0252d536-b30f-4eb7-84d0-a3d0af2ff53f" xlink:href="wynn-20231231.xsd#wynn_WMCaymanIIRevolverDue2025TrancheTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_be641b6d-718f-4f9f-a69a-60168205a4a5" xlink:to="loc_wynn_WMCaymanIIRevolverDue2025TrancheTwoMember_0252d536-b30f-4eb7-84d0-a3d0af2ff53f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_31de1abb-3747-41d4-994e-a2722a64f7af" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_2b55294e-2b26-465d-8e2c-41fe408b8efd" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_31de1abb-3747-41d4-994e-a2722a64f7af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_31de1abb-3747-41d4-994e-a2722a64f7af_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_31de1abb-3747-41d4-994e-a2722a64f7af" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_31de1abb-3747-41d4-994e-a2722a64f7af_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_0339eda1-5340-4d09-ab84-9c04b6efb4c2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_31de1abb-3747-41d4-994e-a2722a64f7af" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_0339eda1-5340-4d09-ab84-9c04b6efb4c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_465d01c0-b742-4453-99e3-3b9cdf822774" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0339eda1-5340-4d09-ab84-9c04b6efb4c2" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_465d01c0-b742-4453-99e3-3b9cdf822774" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_75249ce9-c011-4afc-980b-f2a99a0291cf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0339eda1-5340-4d09-ab84-9c04b6efb4c2" xlink:to="loc_us-gaap_LineOfCreditMember_75249ce9-c011-4afc-980b-f2a99a0291cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_b218b6f5-3402-44f4-ab78-8a900fb87203" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_2b55294e-2b26-465d-8e2c-41fe408b8efd" xlink:to="loc_dei_LegalEntityAxis_b218b6f5-3402-44f4-ab78-8a900fb87203" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_b218b6f5-3402-44f4-ab78-8a900fb87203_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_b218b6f5-3402-44f4-ab78-8a900fb87203" xlink:to="loc_dei_EntityDomain_b218b6f5-3402-44f4-ab78-8a900fb87203_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_2b69a875-5d5a-4132-8003-6583425bc12b" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_b218b6f5-3402-44f4-ab78-8a900fb87203" xlink:to="loc_dei_EntityDomain_2b69a875-5d5a-4132-8003-6583425bc12b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WMCaymanHoldingsLimitedIIMember_9ef4c716-cac3-4551-8cff-29b3425a6ec3" xlink:href="wynn-20231231.xsd#wynn_WMCaymanHoldingsLimitedIIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_2b69a875-5d5a-4132-8003-6583425bc12b" xlink:to="loc_wynn_WMCaymanHoldingsLimitedIIMember_9ef4c716-cac3-4551-8cff-29b3425a6ec3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_07bd2150-340b-4419-9727-42c70d5ea1f8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_2b55294e-2b26-465d-8e2c-41fe408b8efd" xlink:to="loc_us-gaap_CreditFacilityAxis_07bd2150-340b-4419-9727-42c70d5ea1f8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_07bd2150-340b-4419-9727-42c70d5ea1f8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_07bd2150-340b-4419-9727-42c70d5ea1f8" xlink:to="loc_us-gaap_CreditFacilityDomain_07bd2150-340b-4419-9727-42c70d5ea1f8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_24dd34b3-e0db-418b-bdfb-d9abeec2251e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_07bd2150-340b-4419-9727-42c70d5ea1f8" xlink:to="loc_us-gaap_CreditFacilityDomain_24dd34b3-e0db-418b-bdfb-d9abeec2251e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_cfd32ec3-ca68-4668-9655-92b7b1cade26" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_24dd34b3-e0db-418b-bdfb-d9abeec2251e" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_cfd32ec3-ca68-4668-9655-92b7b1cade26" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_ab4833c2-9f98-416b-b0f4-260f51f8ea5c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_2b55294e-2b26-465d-8e2c-41fe408b8efd" xlink:to="loc_us-gaap_VariableRateAxis_ab4833c2-9f98-416b-b0f4-260f51f8ea5c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_ab4833c2-9f98-416b-b0f4-260f51f8ea5c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_ab4833c2-9f98-416b-b0f4-260f51f8ea5c" xlink:to="loc_us-gaap_VariableRateDomain_ab4833c2-9f98-416b-b0f4-260f51f8ea5c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_636e37d7-fa12-4567-9684-93018819d645" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_ab4833c2-9f98-416b-b0f4-260f51f8ea5c" xlink:to="loc_us-gaap_VariableRateDomain_636e37d7-fa12-4567-9684-93018819d645" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_SecuredOvernightFinancingRateSOFRMember_049d21b8-2d08-4f7a-91db-fa7ac4cf420e" xlink:href="wynn-20231231.xsd#wynn_SecuredOvernightFinancingRateSOFRMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_636e37d7-fa12-4567-9684-93018819d645" xlink:to="loc_wynn_SecuredOvernightFinancingRateSOFRMember_049d21b8-2d08-4f7a-91db-fa7ac4cf420e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_HongKongInterbankOfferedRateMember_bfb4dbd9-e2b9-4e0c-9187-54f1a9935db6" xlink:href="wynn-20231231.xsd#wynn_HongKongInterbankOfferedRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_636e37d7-fa12-4567-9684-93018819d645" xlink:to="loc_wynn_HongKongInterbankOfferedRateMember_bfb4dbd9-e2b9-4e0c-9187-54f1a9935db6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_025fd068-4d4c-49d4-9f02-2dc6c9b58ceb" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_2b55294e-2b26-465d-8e2c-41fe408b8efd" xlink:to="loc_srt_RangeAxis_025fd068-4d4c-49d4-9f02-2dc6c9b58ceb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_025fd068-4d4c-49d4-9f02-2dc6c9b58ceb_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_025fd068-4d4c-49d4-9f02-2dc6c9b58ceb" xlink:to="loc_srt_RangeMember_025fd068-4d4c-49d4-9f02-2dc6c9b58ceb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_4a12b0aa-6b14-40e1-82f6-317470db3012" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_025fd068-4d4c-49d4-9f02-2dc6c9b58ceb" xlink:to="loc_srt_RangeMember_4a12b0aa-6b14-40e1-82f6-317470db3012" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_b4d71225-ca0d-4431-8898-faf05cfa4563" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_4a12b0aa-6b14-40e1-82f6-317470db3012" xlink:to="loc_srt_MinimumMember_b4d71225-ca0d-4431-8898-faf05cfa4563" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_6fed0148-6cbd-444c-b819-a3d9e59101f2" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_4a12b0aa-6b14-40e1-82f6-317470db3012" xlink:to="loc_srt_MaximumMember_6fed0148-6cbd-444c-b819-a3d9e59101f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_27d6ad55-0f58-4335-bc77-095d5da3f1d4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_a0fb4d52-c626-4138-9925-1c3289f4064b" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_27d6ad55-0f58-4335-bc77-095d5da3f1d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_LineOfCreditAdditionalBorrowingCapacity_e19664e2-1cca-48cf-bb7b-71e55cfd6df3" xlink:href="wynn-20231231.xsd#wynn_LineOfCreditAdditionalBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_a0fb4d52-c626-4138-9925-1c3289f4064b" xlink:to="loc_wynn_LineOfCreditAdditionalBorrowingCapacity_e19664e2-1cca-48cf-bb7b-71e55cfd6df3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DebtInstrumentAdjustmentRate_ad892b24-95b4-4f08-a494-1157dcfc5f7c" xlink:href="wynn-20231231.xsd#wynn_DebtInstrumentAdjustmentRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_a0fb4d52-c626-4138-9925-1c3289f4064b" xlink:to="loc_wynn_DebtInstrumentAdjustmentRate_ad892b24-95b4-4f08-a494-1157dcfc5f7c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DebtInstrumentFloorRate_7418c6ed-f222-4a43-8bcd-4f6d48f38964" xlink:href="wynn-20231231.xsd#wynn_DebtInstrumentFloorRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_a0fb4d52-c626-4138-9925-1c3289f4064b" xlink:to="loc_wynn_DebtInstrumentFloorRate_7418c6ed-f222-4a43-8bcd-4f6d48f38964" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_b4d85db7-9cb9-44c2-890c-d1b4ba06311f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_a0fb4d52-c626-4138-9925-1c3289f4064b" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_b4d85db7-9cb9-44c2-890c-d1b4ba06311f" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/LongTermDebtWMLConvertibleBondsDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#LongTermDebtWMLConvertibleBondsDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/LongTermDebtWMLConvertibleBondsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_8f852e24-ec77-4c74-889f-409f9ea82551" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_637760d5-7ec8-4360-ba74-4ffacdd59e0a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8f852e24-ec77-4c74-889f-409f9ea82551" xlink:to="loc_us-gaap_DebtInstrumentTable_637760d5-7ec8-4360-ba74-4ffacdd59e0a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_90d71413-df78-4d30-a70a-9ecaa4ca7d27" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_637760d5-7ec8-4360-ba74-4ffacdd59e0a" xlink:to="loc_us-gaap_DebtInstrumentAxis_90d71413-df78-4d30-a70a-9ecaa4ca7d27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_90d71413-df78-4d30-a70a-9ecaa4ca7d27_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_90d71413-df78-4d30-a70a-9ecaa4ca7d27" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_90d71413-df78-4d30-a70a-9ecaa4ca7d27_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_541d5954-c69d-4d0f-8f03-789f44e4170a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_90d71413-df78-4d30-a70a-9ecaa4ca7d27" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_541d5954-c69d-4d0f-8f03-789f44e4170a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WMLConvertibleBondsMember_33c18dcc-9e35-4303-996a-ac602a202b24" xlink:href="wynn-20231231.xsd#wynn_WMLConvertibleBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_541d5954-c69d-4d0f-8f03-789f44e4170a" xlink:to="loc_wynn_WMLConvertibleBondsMember_33c18dcc-9e35-4303-996a-ac602a202b24" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_9659171e-5a49-4b16-8b1f-8c3035b98089" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_637760d5-7ec8-4360-ba74-4ffacdd59e0a" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_9659171e-5a49-4b16-8b1f-8c3035b98089" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_9659171e-5a49-4b16-8b1f-8c3035b98089_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_9659171e-5a49-4b16-8b1f-8c3035b98089" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_9659171e-5a49-4b16-8b1f-8c3035b98089_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_74ad1236-5d7d-41fa-8e9e-9c8e370c8dce" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_9659171e-5a49-4b16-8b1f-8c3035b98089" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_74ad1236-5d7d-41fa-8e9e-9c8e370c8dce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_ef9ae119-6dba-40f9-848c-17e034a8461b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_74ad1236-5d7d-41fa-8e9e-9c8e370c8dce" xlink:to="loc_us-gaap_ConvertibleDebtMember_ef9ae119-6dba-40f9-848c-17e034a8461b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_20014fc2-d14a-4223-9f42-3d68bc2bea2c" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_637760d5-7ec8-4360-ba74-4ffacdd59e0a" xlink:to="loc_dei_LegalEntityAxis_20014fc2-d14a-4223-9f42-3d68bc2bea2c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_20014fc2-d14a-4223-9f42-3d68bc2bea2c_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_20014fc2-d14a-4223-9f42-3d68bc2bea2c" xlink:to="loc_dei_EntityDomain_20014fc2-d14a-4223-9f42-3d68bc2bea2c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_45e380d9-c196-4816-b223-70ebdc0b7a0c" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_20014fc2-d14a-4223-9f42-3d68bc2bea2c" xlink:to="loc_dei_EntityDomain_45e380d9-c196-4816-b223-70ebdc0b7a0c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnMacauLimitedMember_29900a73-02f8-4ec4-bcdc-428b1f14a7ed" xlink:href="wynn-20231231.xsd#wynn_WynnMacauLimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_45e380d9-c196-4816-b223-70ebdc0b7a0c" xlink:to="loc_wynn_WynnMacauLimitedMember_29900a73-02f8-4ec4-bcdc-428b1f14a7ed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_edb94dc5-5f98-43fd-b566-1fe8c8d8079d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8f852e24-ec77-4c74-889f-409f9ea82551" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_edb94dc5-5f98-43fd-b566-1fe8c8d8079d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_c6702c8a-9659-45da-83b6-2b0b8ff331e4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8f852e24-ec77-4c74-889f-409f9ea82551" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_c6702c8a-9659-45da-83b6-2b0b8ff331e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromConvertibleDebt_e95df0a6-619e-46ae-8a14-3a0e17a0153f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromConvertibleDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8f852e24-ec77-4c74-889f-409f9ea82551" xlink:to="loc_us-gaap_ProceedsFromConvertibleDebt_e95df0a6-619e-46ae-8a14-3a0e17a0153f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharePrice_6e4df566-db4d-414d-aa89-995c943ea35e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8f852e24-ec77-4c74-889f-409f9ea82551" xlink:to="loc_us-gaap_SharePrice_6e4df566-db4d-414d-aa89-995c943ea35e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_8a928738-4ea5-4d94-9b91-55991395cc98" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8f852e24-ec77-4c74-889f-409f9ea82551" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_8a928738-4ea5-4d94-9b91-55991395cc98" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionRatio1_81a3e724-5e5b-449e-8713-451ccb98bfcc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentConvertibleConversionRatio1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8f852e24-ec77-4c74-889f-409f9ea82551" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionRatio1_81a3e724-5e5b-449e-8713-451ccb98bfcc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_7f4b7e3a-b051-4944-a244-823b581bec2a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentUnamortizedDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8f852e24-ec77-4c74-889f-409f9ea82551" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_7f4b7e3a-b051-4944-a244-823b581bec2a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_a72a01d2-c2a6-4c68-b61a-fa1d0f953554" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8f852e24-ec77-4c74-889f-409f9ea82551" xlink:to="loc_us-gaap_DerivativeLiabilities_a72a01d2-c2a6-4c68-b61a-fa1d0f953554" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/LongTermDebtWMLSeniorNotesDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#LongTermDebtWMLSeniorNotesDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/LongTermDebtWMLSeniorNotesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_3f2def0f-65a4-48e2-b05b-5c0c2105751a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_b2ed036a-612d-4371-a985-63bcaedd7059" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3f2def0f-65a4-48e2-b05b-5c0c2105751a" xlink:to="loc_us-gaap_DebtInstrumentTable_b2ed036a-612d-4371-a985-63bcaedd7059" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_e3fff2fe-1e1e-4450-98ee-1313fad813ec" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_b2ed036a-612d-4371-a985-63bcaedd7059" xlink:to="loc_us-gaap_DebtInstrumentAxis_e3fff2fe-1e1e-4450-98ee-1313fad813ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_e3fff2fe-1e1e-4450-98ee-1313fad813ec_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_e3fff2fe-1e1e-4450-98ee-1313fad813ec" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_e3fff2fe-1e1e-4450-98ee-1313fad813ec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_e6ae3c4f-4f08-4afc-90ea-d94831b18e1b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_e3fff2fe-1e1e-4450-98ee-1313fad813ec" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_e6ae3c4f-4f08-4afc-90ea-d94831b18e1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_TwoThousandAndTwentySixAndTwoThousandAndTwentyEightWMLNotesMember_b0a40dd1-1b75-46c7-a0b2-84d3f5f18482" xlink:href="wynn-20231231.xsd#wynn_TwoThousandAndTwentySixAndTwoThousandAndTwentyEightWMLNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_e6ae3c4f-4f08-4afc-90ea-d94831b18e1b" xlink:to="loc_wynn_TwoThousandAndTwentySixAndTwoThousandAndTwentyEightWMLNotesMember_b0a40dd1-1b75-46c7-a0b2-84d3f5f18482" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FiveAndFiveOverEightPercentageWynnMacauLimitedSeniorNotesDueTwoThousandTwentyEightMember_2971332b-1b33-4b17-8097-781c5838260d" xlink:href="wynn-20231231.xsd#wynn_FiveAndFiveOverEightPercentageWynnMacauLimitedSeniorNotesDueTwoThousandTwentyEightMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_e6ae3c4f-4f08-4afc-90ea-d94831b18e1b" xlink:to="loc_wynn_FiveAndFiveOverEightPercentageWynnMacauLimitedSeniorNotesDueTwoThousandTwentyEightMember_2971332b-1b33-4b17-8097-781c5838260d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_8a2d1497-7636-4f38-b279-1f4d5d354327" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_b2ed036a-612d-4371-a985-63bcaedd7059" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_8a2d1497-7636-4f38-b279-1f4d5d354327" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_8a2d1497-7636-4f38-b279-1f4d5d354327_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_8a2d1497-7636-4f38-b279-1f4d5d354327" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_8a2d1497-7636-4f38-b279-1f4d5d354327_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_9968c448-60ef-46b3-aa08-c24ad49c9747" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_8a2d1497-7636-4f38-b279-1f4d5d354327" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_9968c448-60ef-46b3-aa08-c24ad49c9747" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_c91ce3e6-b1d2-46f8-b849-5bbcc7d6c18e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPeriodOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_9968c448-60ef-46b3-aa08-c24ad49c9747" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_c91ce3e6-b1d2-46f8-b849-5bbcc7d6c18e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_eb6bd8b0-75fd-4c15-9766-d184f663cfef" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPeriodTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_9968c448-60ef-46b3-aa08-c24ad49c9747" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_eb6bd8b0-75fd-4c15-9766-d184f663cfef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_ac4a8e9a-cfd8-46e8-b543-b46d01efdce7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_b2ed036a-612d-4371-a985-63bcaedd7059" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_ac4a8e9a-cfd8-46e8-b543-b46d01efdce7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_ac4a8e9a-cfd8-46e8-b543-b46d01efdce7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_ac4a8e9a-cfd8-46e8-b543-b46d01efdce7" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_ac4a8e9a-cfd8-46e8-b543-b46d01efdce7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_fb50eeab-57e6-4d75-a4f9-6e563655f8a0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_ac4a8e9a-cfd8-46e8-b543-b46d01efdce7" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_fb50eeab-57e6-4d75-a4f9-6e563655f8a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_2414f875-eeea-42d7-9367-d7143489c939" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_fb50eeab-57e6-4d75-a4f9-6e563655f8a0" xlink:to="loc_us-gaap_SeniorNotesMember_2414f875-eeea-42d7-9367-d7143489c939" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_18bd46f1-d0c0-4b59-ba4c-b96d3398e4d6" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_b2ed036a-612d-4371-a985-63bcaedd7059" xlink:to="loc_dei_LegalEntityAxis_18bd46f1-d0c0-4b59-ba4c-b96d3398e4d6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_18bd46f1-d0c0-4b59-ba4c-b96d3398e4d6_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_18bd46f1-d0c0-4b59-ba4c-b96d3398e4d6" xlink:to="loc_dei_EntityDomain_18bd46f1-d0c0-4b59-ba4c-b96d3398e4d6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_ee5b17ad-85f6-480e-8bf6-9647d9757856" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_18bd46f1-d0c0-4b59-ba4c-b96d3398e4d6" xlink:to="loc_dei_EntityDomain_ee5b17ad-85f6-480e-8bf6-9647d9757856" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnMacauLimitedMember_86a7bba8-3464-409e-956d-d7d3a802749f" xlink:href="wynn-20231231.xsd#wynn_WynnMacauLimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_ee5b17ad-85f6-480e-8bf6-9647d9757856" xlink:to="loc_wynn_WynnMacauLimitedMember_86a7bba8-3464-409e-956d-d7d3a802749f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DebtInstrumentCovenantRequiredRedemptionMinimumConsecutivePeriod_55aa894c-01e4-42a8-abc4-8b476f761711" xlink:href="wynn-20231231.xsd#wynn_DebtInstrumentCovenantRequiredRedemptionMinimumConsecutivePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3f2def0f-65a4-48e2-b05b-5c0c2105751a" xlink:to="loc_wynn_DebtInstrumentCovenantRequiredRedemptionMinimumConsecutivePeriod_55aa894c-01e4-42a8-abc4-8b476f761711" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_ea0a95f2-2508-44ef-ac71-7ebfeb42b57b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3f2def0f-65a4-48e2-b05b-5c0c2105751a" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_ea0a95f2-2508-44ef-ac71-7ebfeb42b57b" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/LongTermDebtWRFCreditFacilitiesDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#LongTermDebtWRFCreditFacilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/LongTermDebtWRFCreditFacilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_7f975dbe-0300-4bd4-8a0f-bc717aedc1c9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_e67d86e8-3c57-4db8-a914-a377ffc545c1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7f975dbe-0300-4bd4-8a0f-bc717aedc1c9" xlink:to="loc_us-gaap_DebtInstrumentTable_e67d86e8-3c57-4db8-a914-a377ffc545c1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_a02e298e-bad2-4e0e-9050-c6cedddd69be" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_e67d86e8-3c57-4db8-a914-a377ffc545c1" xlink:to="loc_us-gaap_DebtInstrumentAxis_a02e298e-bad2-4e0e-9050-c6cedddd69be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_a02e298e-bad2-4e0e-9050-c6cedddd69be_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_a02e298e-bad2-4e0e-9050-c6cedddd69be" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_a02e298e-bad2-4e0e-9050-c6cedddd69be_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_4869b56d-1651-4502-9631-a95118f3f45c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_a02e298e-bad2-4e0e-9050-c6cedddd69be" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_4869b56d-1651-4502-9631-a95118f3f45c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_SeniorTermLoanFacilityDue2024Member_7cfc8287-2588-4548-82b6-df22910afd85" xlink:href="wynn-20231231.xsd#wynn_SeniorTermLoanFacilityDue2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_4869b56d-1651-4502-9631-a95118f3f45c" xlink:to="loc_wynn_SeniorTermLoanFacilityDue2024Member_7cfc8287-2588-4548-82b6-df22910afd85" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_SeniorRevolvingCreditFacilityDue2024Member_7ec3a65f-3b4b-48bb-9094-9ff668fc97b3" xlink:href="wynn-20231231.xsd#wynn_SeniorRevolvingCreditFacilityDue2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_4869b56d-1651-4502-9631-a95118f3f45c" xlink:to="loc_wynn_SeniorRevolvingCreditFacilityDue2024Member_7ec3a65f-3b4b-48bb-9094-9ff668fc97b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WRFSeniorSecuredCreditFacilitiesMember_62b092c6-c272-489a-b933-8cce84b30da4" xlink:href="wynn-20231231.xsd#wynn_WRFSeniorSecuredCreditFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_4869b56d-1651-4502-9631-a95118f3f45c" xlink:to="loc_wynn_WRFSeniorSecuredCreditFacilitiesMember_62b092c6-c272-489a-b933-8cce84b30da4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WRFCreditFacilityAgreementMember_ce8763d0-0d56-4b75-8e89-3cd7977cbe75" xlink:href="wynn-20231231.xsd#wynn_WRFCreditFacilityAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_4869b56d-1651-4502-9631-a95118f3f45c" xlink:to="loc_wynn_WRFCreditFacilityAgreementMember_ce8763d0-0d56-4b75-8e89-3cd7977cbe75" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_aadb565c-2439-49d4-81bb-ba00fcbfa174" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_e67d86e8-3c57-4db8-a914-a377ffc545c1" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_aadb565c-2439-49d4-81bb-ba00fcbfa174" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_aadb565c-2439-49d4-81bb-ba00fcbfa174_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_aadb565c-2439-49d4-81bb-ba00fcbfa174" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_aadb565c-2439-49d4-81bb-ba00fcbfa174_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_ace131ae-f574-4213-bd81-3586dd3c92a1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_aadb565c-2439-49d4-81bb-ba00fcbfa174" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_ace131ae-f574-4213-bd81-3586dd3c92a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_c906a001-4e2f-45e7-ba9f-073aa2d0c18c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_ace131ae-f574-4213-bd81-3586dd3c92a1" xlink:to="loc_us-gaap_SecuredDebtMember_c906a001-4e2f-45e7-ba9f-073aa2d0c18c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_c885caa0-b5df-4f7a-a3cf-834f0d22d24c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_ace131ae-f574-4213-bd81-3586dd3c92a1" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_c885caa0-b5df-4f7a-a3cf-834f0d22d24c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_79aec214-5dec-46b4-a518-e5adbfae9801" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_ace131ae-f574-4213-bd81-3586dd3c92a1" xlink:to="loc_us-gaap_LineOfCreditMember_79aec214-5dec-46b4-a518-e5adbfae9801" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_73ad44d9-9827-4e12-8af2-0ad6311b8fb9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_e67d86e8-3c57-4db8-a914-a377ffc545c1" xlink:to="loc_us-gaap_VariableRateAxis_73ad44d9-9827-4e12-8af2-0ad6311b8fb9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_73ad44d9-9827-4e12-8af2-0ad6311b8fb9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_73ad44d9-9827-4e12-8af2-0ad6311b8fb9" xlink:to="loc_us-gaap_VariableRateDomain_73ad44d9-9827-4e12-8af2-0ad6311b8fb9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_71dbc106-29b3-4208-bbe3-5f3275531e5b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_73ad44d9-9827-4e12-8af2-0ad6311b8fb9" xlink:to="loc_us-gaap_VariableRateDomain_71dbc106-29b3-4208-bbe3-5f3275531e5b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_SecuredOvernightFinancingRateSOFRMember_53f27db2-43bb-4f43-bec0-e5b4f2b32804" xlink:href="wynn-20231231.xsd#wynn_SecuredOvernightFinancingRateSOFRMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_71dbc106-29b3-4208-bbe3-5f3275531e5b" xlink:to="loc_wynn_SecuredOvernightFinancingRateSOFRMember_53f27db2-43bb-4f43-bec0-e5b4f2b32804" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_6593c3f2-a920-447b-b798-8f0d2c7e78b2" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_e67d86e8-3c57-4db8-a914-a377ffc545c1" xlink:to="loc_dei_LegalEntityAxis_6593c3f2-a920-447b-b798-8f0d2c7e78b2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_6593c3f2-a920-447b-b798-8f0d2c7e78b2_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_6593c3f2-a920-447b-b798-8f0d2c7e78b2" xlink:to="loc_dei_EntityDomain_6593c3f2-a920-447b-b798-8f0d2c7e78b2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_1d836652-ce87-489b-af56-52f27f264daf" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_6593c3f2-a920-447b-b798-8f0d2c7e78b2" xlink:to="loc_dei_EntityDomain_1d836652-ce87-489b-af56-52f27f264daf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnResortsFinanceLLCMember_2dc1b09e-7b3f-4178-af34-f44c431868b5" xlink:href="wynn-20231231.xsd#wynn_WynnResortsFinanceLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_1d836652-ce87-489b-af56-52f27f264daf" xlink:to="loc_wynn_WynnResortsFinanceLLCMember_2dc1b09e-7b3f-4178-af34-f44c431868b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DebtInstrumentCovenantPeriodInEffectAxis_d2ff5e07-20f5-4aa7-9073-22e34bf1f6c9" xlink:href="wynn-20231231.xsd#wynn_DebtInstrumentCovenantPeriodInEffectAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_e67d86e8-3c57-4db8-a914-a377ffc545c1" xlink:to="loc_wynn_DebtInstrumentCovenantPeriodInEffectAxis_d2ff5e07-20f5-4aa7-9073-22e34bf1f6c9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DebtInstrumentCovenantPeriodInEffectDomain_d2ff5e07-20f5-4aa7-9073-22e34bf1f6c9_default" xlink:href="wynn-20231231.xsd#wynn_DebtInstrumentCovenantPeriodInEffectDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_wynn_DebtInstrumentCovenantPeriodInEffectAxis_d2ff5e07-20f5-4aa7-9073-22e34bf1f6c9" xlink:to="loc_wynn_DebtInstrumentCovenantPeriodInEffectDomain_d2ff5e07-20f5-4aa7-9073-22e34bf1f6c9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DebtInstrumentCovenantPeriodInEffectDomain_dfaa08ab-765a-4c29-9730-0d5c88a0bf47" xlink:href="wynn-20231231.xsd#wynn_DebtInstrumentCovenantPeriodInEffectDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_wynn_DebtInstrumentCovenantPeriodInEffectAxis_d2ff5e07-20f5-4aa7-9073-22e34bf1f6c9" xlink:to="loc_wynn_DebtInstrumentCovenantPeriodInEffectDomain_dfaa08ab-765a-4c29-9730-0d5c88a0bf47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DuringFinancialCovenantReliefPeriodMember_78b0dacd-96f4-4ecb-a9c6-bffcda437d43" xlink:href="wynn-20231231.xsd#wynn_DuringFinancialCovenantReliefPeriodMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_DebtInstrumentCovenantPeriodInEffectDomain_dfaa08ab-765a-4c29-9730-0d5c88a0bf47" xlink:to="loc_wynn_DuringFinancialCovenantReliefPeriodMember_78b0dacd-96f4-4ecb-a9c6-bffcda437d43" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FourthFiscalQuarterAndThereafterOfTheFinancialCovenantIncreasePeriodMember_d8633ce6-04b9-4780-bd99-f6d9c110c08c" xlink:href="wynn-20231231.xsd#wynn_FourthFiscalQuarterAndThereafterOfTheFinancialCovenantIncreasePeriodMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_DebtInstrumentCovenantPeriodInEffectDomain_dfaa08ab-765a-4c29-9730-0d5c88a0bf47" xlink:to="loc_wynn_FourthFiscalQuarterAndThereafterOfTheFinancialCovenantIncreasePeriodMember_d8633ce6-04b9-4780-bd99-f6d9c110c08c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_18245941-fb86-45cb-8765-e5f2b51dc178" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_e67d86e8-3c57-4db8-a914-a377ffc545c1" xlink:to="loc_us-gaap_CreditFacilityAxis_18245941-fb86-45cb-8765-e5f2b51dc178" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_18245941-fb86-45cb-8765-e5f2b51dc178_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_18245941-fb86-45cb-8765-e5f2b51dc178" xlink:to="loc_us-gaap_CreditFacilityDomain_18245941-fb86-45cb-8765-e5f2b51dc178_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_cc1af333-5653-490f-9194-aef7ca28b0e5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_18245941-fb86-45cb-8765-e5f2b51dc178" xlink:to="loc_us-gaap_CreditFacilityDomain_cc1af333-5653-490f-9194-aef7ca28b0e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_d508f3b0-612f-4416-905f-de99ea8786c2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_cc1af333-5653-490f-9194-aef7ca28b0e5" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_d508f3b0-612f-4416-905f-de99ea8786c2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_b94e6322-b3cd-4bd0-9fc5-c9a88c4bfe57" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7f975dbe-0300-4bd4-8a0f-bc717aedc1c9" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_b94e6322-b3cd-4bd0-9fc5-c9a88c4bfe57" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_a0fa365c-b83f-49a1-be59-aa3c8c42830e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7f975dbe-0300-4bd4-8a0f-bc717aedc1c9" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_a0fa365c-b83f-49a1-be59-aa3c8c42830e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_2154f57c-08e6-4e82-89c0-0c3c28ee91b9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7f975dbe-0300-4bd4-8a0f-bc717aedc1c9" xlink:to="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_2154f57c-08e6-4e82-89c0-0c3c28ee91b9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_88bfb6e7-766c-4109-8096-3f56fbf416dc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentPeriodicPaymentPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7f975dbe-0300-4bd4-8a0f-bc717aedc1c9" xlink:to="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_88bfb6e7-766c-4109-8096-3f56fbf416dc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DebtInstrumentCovenantTermsMaximumConsolidatedSeniorSecuredNetLeverageRatio_a40ffaff-5d6d-45c5-b955-dd993c43bdab" xlink:href="wynn-20231231.xsd#wynn_DebtInstrumentCovenantTermsMaximumConsolidatedSeniorSecuredNetLeverageRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7f975dbe-0300-4bd4-8a0f-bc717aedc1c9" xlink:to="loc_wynn_DebtInstrumentCovenantTermsMaximumConsolidatedSeniorSecuredNetLeverageRatio_a40ffaff-5d6d-45c5-b955-dd993c43bdab" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DebtInstrumentCovenantTermsMinimumLiquidityRequirement_fb45bca1-b318-4d90-ae9d-9a9d3dc1e440" xlink:href="wynn-20231231.xsd#wynn_DebtInstrumentCovenantTermsMinimumLiquidityRequirement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7f975dbe-0300-4bd4-8a0f-bc717aedc1c9" xlink:to="loc_wynn_DebtInstrumentCovenantTermsMinimumLiquidityRequirement_fb45bca1-b318-4d90-ae9d-9a9d3dc1e440" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DebtInstrumentCovenantTermsMaximumConsolidatedFirstLienNetLeverageRatio_ea73604f-193f-4cff-800f-4315974832e5" xlink:href="wynn-20231231.xsd#wynn_DebtInstrumentCovenantTermsMaximumConsolidatedFirstLienNetLeverageRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7f975dbe-0300-4bd4-8a0f-bc717aedc1c9" xlink:to="loc_wynn_DebtInstrumentCovenantTermsMaximumConsolidatedFirstLienNetLeverageRatio_ea73604f-193f-4cff-800f-4315974832e5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_LineOfCreditFacilityMaximumBorrowingCapacityLimitDecrease_0a4018ec-bc29-4f73-9343-0a49842f11a4" xlink:href="wynn-20231231.xsd#wynn_LineOfCreditFacilityMaximumBorrowingCapacityLimitDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7f975dbe-0300-4bd4-8a0f-bc717aedc1c9" xlink:to="loc_wynn_LineOfCreditFacilityMaximumBorrowingCapacityLimitDecrease_0a4018ec-bc29-4f73-9343-0a49842f11a4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2525a73f-a4fc-460b-96bd-5dddc0d78f5c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7f975dbe-0300-4bd4-8a0f-bc717aedc1c9" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2525a73f-a4fc-460b-96bd-5dddc0d78f5c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_LineOfCreditFacilityCommitmentExtended_e3d33b2d-c2db-4d43-80b6-130832ad4da8" xlink:href="wynn-20231231.xsd#wynn_LineOfCreditFacilityCommitmentExtended"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7f975dbe-0300-4bd4-8a0f-bc717aedc1c9" xlink:to="loc_wynn_LineOfCreditFacilityCommitmentExtended_e3d33b2d-c2db-4d43-80b6-130832ad4da8" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_LineOfCreditFacilityCommitmentNotExtended_a53618bb-f43c-49b2-8547-fb526f1f70bc" xlink:href="wynn-20231231.xsd#wynn_LineOfCreditFacilityCommitmentNotExtended"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7f975dbe-0300-4bd4-8a0f-bc717aedc1c9" xlink:to="loc_wynn_LineOfCreditFacilityCommitmentNotExtended_a53618bb-f43c-49b2-8547-fb526f1f70bc" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnRestructuringOfDebt_1027d6dd-7cf2-4a37-a6f6-56172ad3d06e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainsLossesOnRestructuringOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7f975dbe-0300-4bd4-8a0f-bc717aedc1c9" xlink:to="loc_us-gaap_GainsLossesOnRestructuringOfDebt_1027d6dd-7cf2-4a37-a6f6-56172ad3d06e" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_00f9c218-06ef-40e3-8af5-e51903cfb4cb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7f975dbe-0300-4bd4-8a0f-bc717aedc1c9" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_00f9c218-06ef-40e3-8af5-e51903cfb4cb" xlink:type="arc" order="12"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/LongTermDebtWRFSeniorNotesDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#LongTermDebtWRFSeniorNotesDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/LongTermDebtWRFSeniorNotesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_a82c3c34-5eda-4817-9c10-4cb1fdf83a7d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_77addd9d-ca0c-4d95-8b8f-7a0bc7a44b43" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a82c3c34-5eda-4817-9c10-4cb1fdf83a7d" xlink:to="loc_us-gaap_DebtInstrumentTable_77addd9d-ca0c-4d95-8b8f-7a0bc7a44b43" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_c3861f2b-0439-4a38-8545-603cbbf9f3f6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_77addd9d-ca0c-4d95-8b8f-7a0bc7a44b43" xlink:to="loc_us-gaap_DebtInstrumentAxis_c3861f2b-0439-4a38-8545-603cbbf9f3f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_c3861f2b-0439-4a38-8545-603cbbf9f3f6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_c3861f2b-0439-4a38-8545-603cbbf9f3f6" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_c3861f2b-0439-4a38-8545-603cbbf9f3f6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_33773fa3-713e-48f4-9f97-287a09ece854" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_c3861f2b-0439-4a38-8545-603cbbf9f3f6" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_33773fa3-713e-48f4-9f97-287a09ece854" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_SevenAndThreeOverFourPercentageWRFSeniorNotesDue2025Member_c8b7145c-fb71-4c67-a5d3-c15188e48dd1" xlink:href="wynn-20231231.xsd#wynn_SevenAndThreeOverFourPercentageWRFSeniorNotesDue2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_33773fa3-713e-48f4-9f97-287a09ece854" xlink:to="loc_wynn_SevenAndThreeOverFourPercentageWRFSeniorNotesDue2025Member_c8b7145c-fb71-4c67-a5d3-c15188e48dd1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FiveAndOneOverEightPercentageSeniorNotesDue2029Member_c42e9675-085c-43ec-93c3-730830348968" xlink:href="wynn-20231231.xsd#wynn_FiveAndOneOverEightPercentageSeniorNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_33773fa3-713e-48f4-9f97-287a09ece854" xlink:to="loc_wynn_FiveAndOneOverEightPercentageSeniorNotesDue2029Member_c42e9675-085c-43ec-93c3-730830348968" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_SevenAndOneOverEightPercentageSeniorNotesDue2031Member_20958ce9-46e6-4fd8-804b-8a19b1881c12" xlink:href="wynn-20231231.xsd#wynn_SevenAndOneOverEightPercentageSeniorNotesDue2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_33773fa3-713e-48f4-9f97-287a09ece854" xlink:to="loc_wynn_SevenAndOneOverEightPercentageSeniorNotesDue2031Member_20958ce9-46e6-4fd8-804b-8a19b1881c12" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FiveandOneHalfPercentSeniorNotesDueMarchOneTwentyTwentyFiveMember_a20e2e4f-4dc9-41de-a087-546b962e3d16" xlink:href="wynn-20231231.xsd#wynn_FiveandOneHalfPercentSeniorNotesDueMarchOneTwentyTwentyFiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_33773fa3-713e-48f4-9f97-287a09ece854" xlink:to="loc_wynn_FiveandOneHalfPercentSeniorNotesDueMarchOneTwentyTwentyFiveMember_a20e2e4f-4dc9-41de-a087-546b962e3d16" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_4bbd0c7b-c90b-4b71-a79f-ccde2a9846dd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_77addd9d-ca0c-4d95-8b8f-7a0bc7a44b43" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_4bbd0c7b-c90b-4b71-a79f-ccde2a9846dd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_4bbd0c7b-c90b-4b71-a79f-ccde2a9846dd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_4bbd0c7b-c90b-4b71-a79f-ccde2a9846dd" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_4bbd0c7b-c90b-4b71-a79f-ccde2a9846dd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_898a754e-8726-4186-8245-963bc13af16c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_4bbd0c7b-c90b-4b71-a79f-ccde2a9846dd" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_898a754e-8726-4186-8245-963bc13af16c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_e7b933f8-6e80-410b-87e9-58f67d4c1bdb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_898a754e-8726-4186-8245-963bc13af16c" xlink:to="loc_us-gaap_SeniorNotesMember_e7b933f8-6e80-410b-87e9-58f67d4c1bdb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_b25e71a7-8c5f-48a7-8223-67066d7ab6c6" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_77addd9d-ca0c-4d95-8b8f-7a0bc7a44b43" xlink:to="loc_dei_LegalEntityAxis_b25e71a7-8c5f-48a7-8223-67066d7ab6c6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_b25e71a7-8c5f-48a7-8223-67066d7ab6c6_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_b25e71a7-8c5f-48a7-8223-67066d7ab6c6" xlink:to="loc_dei_EntityDomain_b25e71a7-8c5f-48a7-8223-67066d7ab6c6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_a84fed19-a04e-4900-bf6f-92a24c29ebf9" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_b25e71a7-8c5f-48a7-8223-67066d7ab6c6" xlink:to="loc_dei_EntityDomain_a84fed19-a04e-4900-bf6f-92a24c29ebf9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnResortsFinanceLLCMember_f72af504-3f7f-44b5-b55f-543bae98c774" xlink:href="wynn-20231231.xsd#wynn_WynnResortsFinanceLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_a84fed19-a04e-4900-bf6f-92a24c29ebf9" xlink:to="loc_wynn_WynnResortsFinanceLLCMember_f72af504-3f7f-44b5-b55f-543bae98c774" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnLasVegasLLCandWynnLasVegasCapitalCorpMember_3dc862b8-b426-42fb-a321-34c5fd586082" xlink:href="wynn-20231231.xsd#wynn_WynnLasVegasLLCandWynnLasVegasCapitalCorpMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_a84fed19-a04e-4900-bf6f-92a24c29ebf9" xlink:to="loc_wynn_WynnLasVegasLLCandWynnLasVegasCapitalCorpMember_3dc862b8-b426-42fb-a321-34c5fd586082" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_4b556bd9-357b-48b3-b92c-fc4d82435a7f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_77addd9d-ca0c-4d95-8b8f-7a0bc7a44b43" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_4b556bd9-357b-48b3-b92c-fc4d82435a7f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_4b556bd9-357b-48b3-b92c-fc4d82435a7f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_4b556bd9-357b-48b3-b92c-fc4d82435a7f" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_4b556bd9-357b-48b3-b92c-fc4d82435a7f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_95afb15e-5967-430e-a7cf-77f831e59e7f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_4b556bd9-357b-48b3-b92c-fc4d82435a7f" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_95afb15e-5967-430e-a7cf-77f831e59e7f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_73e9b148-7ff5-4a32-a2d0-5b4ff9041f60" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_95afb15e-5967-430e-a7cf-77f831e59e7f" xlink:to="loc_us-gaap_SubsequentEventMember_73e9b148-7ff5-4a32-a2d0-5b4ff9041f60" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_26f5ff63-5eec-4ffb-8156-69ecd4443daa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a82c3c34-5eda-4817-9c10-4cb1fdf83a7d" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_26f5ff63-5eec-4ffb-8156-69ecd4443daa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_0de77c6f-4a84-4600-b1e7-f5f99706ebdd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a82c3c34-5eda-4817-9c10-4cb1fdf83a7d" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_0de77c6f-4a84-4600-b1e7-f5f99706ebdd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_09bf020e-68b6-406b-a44a-ca83e61673f8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a82c3c34-5eda-4817-9c10-4cb1fdf83a7d" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_09bf020e-68b6-406b-a44a-ca83e61673f8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_47ecc4ec-6c2a-4b4e-bdb3-23e2fed276dc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsOfDebtIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a82c3c34-5eda-4817-9c10-4cb1fdf83a7d" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_47ecc4ec-6c2a-4b4e-bdb3-23e2fed276dc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRepurchaseAmount_0bead870-3cb9-48a6-8bc3-61d3cc8ddfed" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRepurchaseAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a82c3c34-5eda-4817-9c10-4cb1fdf83a7d" xlink:to="loc_us-gaap_DebtInstrumentRepurchaseAmount_0bead870-3cb9-48a6-8bc3-61d3cc8ddfed" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DebtInstrumentEarlyTenderPremium_13a894b1-3012-4606-9527-b725c83e2812" xlink:href="wynn-20231231.xsd#wynn_DebtInstrumentEarlyTenderPremium"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a82c3c34-5eda-4817-9c10-4cb1fdf83a7d" xlink:to="loc_wynn_DebtInstrumentEarlyTenderPremium_13a894b1-3012-4606-9527-b725c83e2812" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_a46272d7-3cfb-4eeb-9fd6-8b4a4cd13f01" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a82c3c34-5eda-4817-9c10-4cb1fdf83a7d" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_a46272d7-3cfb-4eeb-9fd6-8b4a4cd13f01" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnRestructuringOfDebt_01407a35-c3a7-4596-a6ee-85cc0328511c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainsLossesOnRestructuringOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a82c3c34-5eda-4817-9c10-4cb1fdf83a7d" xlink:to="loc_us-gaap_GainsLossesOnRestructuringOfDebt_01407a35-c3a7-4596-a6ee-85cc0328511c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_04dffa43-9adb-4900-a816-c2bd8ba18e48" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a82c3c34-5eda-4817-9c10-4cb1fdf83a7d" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_04dffa43-9adb-4900-a816-c2bd8ba18e48" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_8d3155aa-ca44-47ed-a6af-69f48a6e7bca" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a82c3c34-5eda-4817-9c10-4cb1fdf83a7d" xlink:to="loc_us-gaap_LongTermDebt_8d3155aa-ca44-47ed-a6af-69f48a6e7bca" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfDebt_d42e0656-60ee-47a2-9ac1-26b567641361" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RepaymentsOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a82c3c34-5eda-4817-9c10-4cb1fdf83a7d" xlink:to="loc_us-gaap_RepaymentsOfDebt_d42e0656-60ee-47a2-9ac1-26b567641361" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/LongTermDebtWLVSeniorNotesDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#LongTermDebtWLVSeniorNotesDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/LongTermDebtWLVSeniorNotesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_1995d0e5-1662-4aae-9cf1-c609cbba01f0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_e73a282e-6d59-49da-84f1-7c18440cedeb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1995d0e5-1662-4aae-9cf1-c609cbba01f0" xlink:to="loc_us-gaap_DebtInstrumentTable_e73a282e-6d59-49da-84f1-7c18440cedeb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_bf5335d9-4fff-4850-a13f-6f465c102766" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_e73a282e-6d59-49da-84f1-7c18440cedeb" xlink:to="loc_dei_LegalEntityAxis_bf5335d9-4fff-4850-a13f-6f465c102766" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_bf5335d9-4fff-4850-a13f-6f465c102766_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_bf5335d9-4fff-4850-a13f-6f465c102766" xlink:to="loc_dei_EntityDomain_bf5335d9-4fff-4850-a13f-6f465c102766_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_87b9cd1e-470a-4104-bac1-765104921f0a" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_bf5335d9-4fff-4850-a13f-6f465c102766" xlink:to="loc_dei_EntityDomain_87b9cd1e-470a-4104-bac1-765104921f0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnLasVegasLLCandWynnLasVegasCapitalCorpMember_7e20a452-dbaa-46af-81a6-f96304460898" xlink:href="wynn-20231231.xsd#wynn_WynnLasVegasLLCandWynnLasVegasCapitalCorpMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_87b9cd1e-470a-4104-bac1-765104921f0a" xlink:to="loc_wynn_WynnLasVegasLLCandWynnLasVegasCapitalCorpMember_7e20a452-dbaa-46af-81a6-f96304460898" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_0bb1e7bc-eb34-47a5-8902-c21abef9e167" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_e73a282e-6d59-49da-84f1-7c18440cedeb" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_0bb1e7bc-eb34-47a5-8902-c21abef9e167" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_0bb1e7bc-eb34-47a5-8902-c21abef9e167_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_0bb1e7bc-eb34-47a5-8902-c21abef9e167" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_0bb1e7bc-eb34-47a5-8902-c21abef9e167_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_756ded7b-d983-40fa-ad4e-b3d4813a4496" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_0bb1e7bc-eb34-47a5-8902-c21abef9e167" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_756ded7b-d983-40fa-ad4e-b3d4813a4496" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_91fe6127-2456-4f1c-b5ac-a0140bdc2ca3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_756ded7b-d983-40fa-ad4e-b3d4813a4496" xlink:to="loc_us-gaap_SeniorNotesMember_91fe6127-2456-4f1c-b5ac-a0140bdc2ca3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_2707ea79-d9a2-481f-bb94-403dd64a53f8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_e73a282e-6d59-49da-84f1-7c18440cedeb" xlink:to="loc_us-gaap_DebtInstrumentAxis_2707ea79-d9a2-481f-bb94-403dd64a53f8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_2707ea79-d9a2-481f-bb94-403dd64a53f8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_2707ea79-d9a2-481f-bb94-403dd64a53f8" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_2707ea79-d9a2-481f-bb94-403dd64a53f8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_5670834f-552c-4a15-ae5c-d1bfa7473072" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_2707ea79-d9a2-481f-bb94-403dd64a53f8" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_5670834f-552c-4a15-ae5c-d1bfa7473072" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FourAndOneOverFourPercentageWynnLasVegasSeniorNotesDueMayThirtyTwoThousandTwentyThreeMember_57f923fa-a519-40bb-8494-1db870df6ead" xlink:href="wynn-20231231.xsd#wynn_FourAndOneOverFourPercentageWynnLasVegasSeniorNotesDueMayThirtyTwoThousandTwentyThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_5670834f-552c-4a15-ae5c-d1bfa7473072" xlink:to="loc_wynn_FourAndOneOverFourPercentageWynnLasVegasSeniorNotesDueMayThirtyTwoThousandTwentyThreeMember_57f923fa-a519-40bb-8494-1db870df6ead" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_A5.5SeniorNotesDue2025And5.25SeniorNotesDue2027Member_c0f3ce94-fe21-464d-9b9c-ee469c7a16f3" xlink:href="wynn-20231231.xsd#wynn_A5.5SeniorNotesDue2025And5.25SeniorNotesDue2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_5670834f-552c-4a15-ae5c-d1bfa7473072" xlink:to="loc_wynn_A5.5SeniorNotesDue2025And5.25SeniorNotesDue2027Member_c0f3ce94-fe21-464d-9b9c-ee469c7a16f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FiveandOneHalfPercentSeniorNotesDueMarchOneTwentyTwentyFiveMember_340a0e58-c099-4ffa-abbe-8de957ae370d" xlink:href="wynn-20231231.xsd#wynn_FiveandOneHalfPercentSeniorNotesDueMarchOneTwentyTwentyFiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_A5.5SeniorNotesDue2025And5.25SeniorNotesDue2027Member_c0f3ce94-fe21-464d-9b9c-ee469c7a16f3" xlink:to="loc_wynn_FiveandOneHalfPercentSeniorNotesDueMarchOneTwentyTwentyFiveMember_340a0e58-c099-4ffa-abbe-8de957ae370d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FiveAndOneOverFourPercentageSeniorNotesDueMay152027Member_bdceae51-3420-4396-b2d4-160d3fd77030" xlink:href="wynn-20231231.xsd#wynn_FiveAndOneOverFourPercentageSeniorNotesDueMay152027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_A5.5SeniorNotesDue2025And5.25SeniorNotesDue2027Member_c0f3ce94-fe21-464d-9b9c-ee469c7a16f3" xlink:to="loc_wynn_FiveAndOneOverFourPercentageSeniorNotesDueMay152027Member_bdceae51-3420-4396-b2d4-160d3fd77030" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WRFSeniorSecuredCreditFacilitiesMember_174ab3d6-1244-4ab3-81c8-10cfc0fa836c" xlink:href="wynn-20231231.xsd#wynn_WRFSeniorSecuredCreditFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_5670834f-552c-4a15-ae5c-d1bfa7473072" xlink:to="loc_wynn_WRFSeniorSecuredCreditFacilitiesMember_174ab3d6-1244-4ab3-81c8-10cfc0fa836c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_acba0c68-eb19-4018-a088-390f0cdddcfe" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_e73a282e-6d59-49da-84f1-7c18440cedeb" xlink:to="loc_srt_ConsolidatedEntitiesAxis_acba0c68-eb19-4018-a088-390f0cdddcfe" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_acba0c68-eb19-4018-a088-390f0cdddcfe_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_acba0c68-eb19-4018-a088-390f0cdddcfe" xlink:to="loc_srt_ConsolidatedEntitiesDomain_acba0c68-eb19-4018-a088-390f0cdddcfe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_2b55d71e-af75-44b7-ab5e-5e541810be27" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_acba0c68-eb19-4018-a088-390f0cdddcfe" xlink:to="loc_srt_ConsolidatedEntitiesDomain_2b55d71e-af75-44b7-ab5e-5e541810be27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SubsidiaryIssuerMember_0d3771ba-c13d-4a37-972b-2d78ed3a2063" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SubsidiaryIssuerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_2b55d71e-af75-44b7-ab5e-5e541810be27" xlink:to="loc_srt_SubsidiaryIssuerMember_0d3771ba-c13d-4a37-972b-2d78ed3a2063" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_02b3405a-3427-4a6c-bfc5-44e1ba90dc81" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_e73a282e-6d59-49da-84f1-7c18440cedeb" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_02b3405a-3427-4a6c-bfc5-44e1ba90dc81" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_02b3405a-3427-4a6c-bfc5-44e1ba90dc81_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_02b3405a-3427-4a6c-bfc5-44e1ba90dc81" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_02b3405a-3427-4a6c-bfc5-44e1ba90dc81_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_ed418ffd-f3e8-49aa-9ef0-c82abc8fbe83" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_02b3405a-3427-4a6c-bfc5-44e1ba90dc81" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_ed418ffd-f3e8-49aa-9ef0-c82abc8fbe83" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_5106c35d-ab98-4843-b709-f717fee5733c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_ed418ffd-f3e8-49aa-9ef0-c82abc8fbe83" xlink:to="loc_us-gaap_SubsequentEventMember_5106c35d-ab98-4843-b709-f717fee5733c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_decf736c-6329-42f0-848d-650cf6612d45" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1995d0e5-1662-4aae-9cf1-c609cbba01f0" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_decf736c-6329-42f0-848d-650cf6612d45" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_eba3d810-eba9-435c-b418-4f2194e6e62f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1995d0e5-1662-4aae-9cf1-c609cbba01f0" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_eba3d810-eba9-435c-b418-4f2194e6e62f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRepurchaseAmount_ca8e73bb-db06-4d08-83f1-d767457d34b3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRepurchaseAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1995d0e5-1662-4aae-9cf1-c609cbba01f0" xlink:to="loc_us-gaap_DebtInstrumentRepurchaseAmount_ca8e73bb-db06-4d08-83f1-d767457d34b3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_524606aa-cb16-491f-967a-e3dcbfd09651" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1995d0e5-1662-4aae-9cf1-c609cbba01f0" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_524606aa-cb16-491f-967a-e3dcbfd09651" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DebtInstrumentEarlyTenderPremium_f2751a14-c7b7-4713-8c59-642ebda8542b" xlink:href="wynn-20231231.xsd#wynn_DebtInstrumentEarlyTenderPremium"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1995d0e5-1662-4aae-9cf1-c609cbba01f0" xlink:to="loc_wynn_DebtInstrumentEarlyTenderPremium_f2751a14-c7b7-4713-8c59-642ebda8542b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_b6d3ebb4-5382-4ba0-a9cb-3eedf37f84d5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1995d0e5-1662-4aae-9cf1-c609cbba01f0" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_b6d3ebb4-5382-4ba0-a9cb-3eedf37f84d5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_05ac2509-4981-4731-8169-8a29199e871e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRepurchasedFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1995d0e5-1662-4aae-9cf1-c609cbba01f0" xlink:to="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_05ac2509-4981-4731-8169-8a29199e871e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_PaymentDefaultClassificationPeriodForInterestPayment_73e53253-fe1a-4a1c-92ca-e7f981ae89d4" xlink:href="wynn-20231231.xsd#wynn_PaymentDefaultClassificationPeriodForInterestPayment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1995d0e5-1662-4aae-9cf1-c609cbba01f0" xlink:to="loc_wynn_PaymentDefaultClassificationPeriodForInterestPayment_73e53253-fe1a-4a1c-92ca-e7f981ae89d4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DebtInstrumentCovenantPercentageofTotalAssets_933092ac-4562-4e1c-832a-af334223830a" xlink:href="wynn-20231231.xsd#wynn_DebtInstrumentCovenantPercentageofTotalAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1995d0e5-1662-4aae-9cf1-c609cbba01f0" xlink:to="loc_wynn_DebtInstrumentCovenantPercentageofTotalAssets_933092ac-4562-4e1c-832a-af334223830a" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/LongTermDebtRetailTermLoanDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#LongTermDebtRetailTermLoanDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/LongTermDebtRetailTermLoanDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_7617500b-2d95-48e4-8f3e-534d22c23d68" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_fe18be08-253f-41a6-bb1f-a879f8192215" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7617500b-2d95-48e4-8f3e-534d22c23d68" xlink:to="loc_us-gaap_DebtInstrumentTable_fe18be08-253f-41a6-bb1f-a879f8192215" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_25dfc87c-4e4f-4b14-98dd-0073db7cba9d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_fe18be08-253f-41a6-bb1f-a879f8192215" xlink:to="loc_us-gaap_DebtInstrumentAxis_25dfc87c-4e4f-4b14-98dd-0073db7cba9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_25dfc87c-4e4f-4b14-98dd-0073db7cba9d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_25dfc87c-4e4f-4b14-98dd-0073db7cba9d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_25dfc87c-4e4f-4b14-98dd-0073db7cba9d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_6f31448e-8263-4720-aacb-343ca7a54175" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_25dfc87c-4e4f-4b14-98dd-0073db7cba9d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_6f31448e-8263-4720-aacb-343ca7a54175" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_RetailTermLoanAgreementMember_66294455-11de-4b45-80fb-7d0e8564a5b5" xlink:href="wynn-20231231.xsd#wynn_RetailTermLoanAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6f31448e-8263-4720-aacb-343ca7a54175" xlink:to="loc_wynn_RetailTermLoanAgreementMember_66294455-11de-4b45-80fb-7d0e8564a5b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_df2b4396-e74e-40a7-a88e-af16323c34b3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_fe18be08-253f-41a6-bb1f-a879f8192215" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_df2b4396-e74e-40a7-a88e-af16323c34b3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_df2b4396-e74e-40a7-a88e-af16323c34b3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_df2b4396-e74e-40a7-a88e-af16323c34b3" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_df2b4396-e74e-40a7-a88e-af16323c34b3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_fc070517-3c76-445d-a08c-44e620af5ddd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_df2b4396-e74e-40a7-a88e-af16323c34b3" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_fc070517-3c76-445d-a08c-44e620af5ddd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MediumTermNotesMember_ea72de55-b476-4af5-a290-7c6f548b4072" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MediumTermNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_fc070517-3c76-445d-a08c-44e620af5ddd" xlink:to="loc_us-gaap_MediumTermNotesMember_ea72de55-b476-4af5-a290-7c6f548b4072" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_b5f066b0-fb25-41fe-8a6f-d61db2603608" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_fe18be08-253f-41a6-bb1f-a879f8192215" xlink:to="loc_dei_LegalEntityAxis_b5f066b0-fb25-41fe-8a6f-d61db2603608" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_b5f066b0-fb25-41fe-8a6f-d61db2603608_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_b5f066b0-fb25-41fe-8a6f-d61db2603608" xlink:to="loc_dei_EntityDomain_b5f066b0-fb25-41fe-8a6f-d61db2603608_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_4dd3e76a-ac35-4956-9ea0-bba21d579b48" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_b5f066b0-fb25-41fe-8a6f-d61db2603608" xlink:to="loc_dei_EntityDomain_4dd3e76a-ac35-4956-9ea0-bba21d579b48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnCAPlazaPropertyOwnerLLCAndWynnCAPropertyOwnerLLCMember_7e80dfcd-0927-4be6-995f-ad5ad7c68dd5" xlink:href="wynn-20231231.xsd#wynn_WynnCAPlazaPropertyOwnerLLCAndWynnCAPropertyOwnerLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_4dd3e76a-ac35-4956-9ea0-bba21d579b48" xlink:to="loc_wynn_WynnCAPlazaPropertyOwnerLLCAndWynnCAPropertyOwnerLLCMember_7e80dfcd-0927-4be6-995f-ad5ad7c68dd5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_52a9202c-c13c-4fbf-9546-916a4d70d3a2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_fe18be08-253f-41a6-bb1f-a879f8192215" xlink:to="loc_us-gaap_VariableRateAxis_52a9202c-c13c-4fbf-9546-916a4d70d3a2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_52a9202c-c13c-4fbf-9546-916a4d70d3a2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_52a9202c-c13c-4fbf-9546-916a4d70d3a2" xlink:to="loc_us-gaap_VariableRateDomain_52a9202c-c13c-4fbf-9546-916a4d70d3a2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_aee65fcd-e3c6-4a21-b390-9d583e26cfeb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_52a9202c-c13c-4fbf-9546-916a4d70d3a2" xlink:to="loc_us-gaap_VariableRateDomain_aee65fcd-e3c6-4a21-b390-9d583e26cfeb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_SecuredOvernightFinancingRateSOFRMember_777ce9e8-16e8-4ce8-a6aa-f24eaffd92e5" xlink:href="wynn-20231231.xsd#wynn_SecuredOvernightFinancingRateSOFRMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_aee65fcd-e3c6-4a21-b390-9d583e26cfeb" xlink:to="loc_wynn_SecuredOvernightFinancingRateSOFRMember_777ce9e8-16e8-4ce8-a6aa-f24eaffd92e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_2d1d7f66-0a29-4c14-9733-5ab5a1307529" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_fe18be08-253f-41a6-bb1f-a879f8192215" xlink:to="loc_srt_RangeAxis_2d1d7f66-0a29-4c14-9733-5ab5a1307529" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_2d1d7f66-0a29-4c14-9733-5ab5a1307529_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_2d1d7f66-0a29-4c14-9733-5ab5a1307529" xlink:to="loc_srt_RangeMember_2d1d7f66-0a29-4c14-9733-5ab5a1307529_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_bc1f038d-a45b-4cb2-ae7b-663bccbbc620" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_2d1d7f66-0a29-4c14-9733-5ab5a1307529" xlink:to="loc_srt_RangeMember_bc1f038d-a45b-4cb2-ae7b-663bccbbc620" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_77680194-b644-4e72-9069-21122ed11d9e" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_bc1f038d-a45b-4cb2-ae7b-663bccbbc620" xlink:to="loc_srt_MinimumMember_77680194-b644-4e72-9069-21122ed11d9e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_fec6cf0a-cb15-42d9-933d-39d789124d9d" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_bc1f038d-a45b-4cb2-ae7b-663bccbbc620" xlink:to="loc_srt_MaximumMember_fec6cf0a-cb15-42d9-933d-39d789124d9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_13d3702c-c6f2-4665-8fd2-b9f2f897d9f9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_fe18be08-253f-41a6-bb1f-a879f8192215" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_13d3702c-c6f2-4665-8fd2-b9f2f897d9f9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_13d3702c-c6f2-4665-8fd2-b9f2f897d9f9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_13d3702c-c6f2-4665-8fd2-b9f2f897d9f9" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_13d3702c-c6f2-4665-8fd2-b9f2f897d9f9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_5302ef21-0cfe-4522-a98a-682e36be0e68" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_13d3702c-c6f2-4665-8fd2-b9f2f897d9f9" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_5302ef21-0cfe-4522-a98a-682e36be0e68" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_InterestRateCollarMember_5dad7b97-0771-471c-a249-4091c6900ee5" xlink:href="wynn-20231231.xsd#wynn_InterestRateCollarMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_5302ef21-0cfe-4522-a98a-682e36be0e68" xlink:to="loc_wynn_InterestRateCollarMember_5dad7b97-0771-471c-a249-4091c6900ee5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_35b78e57-a990-491b-bc1b-d9dc87fdd939" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7617500b-2d95-48e4-8f3e-534d22c23d68" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_35b78e57-a990-491b-bc1b-d9dc87fdd939" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_4255ba38-5812-493e-a183-1be0c349dd60" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7617500b-2d95-48e4-8f3e-534d22c23d68" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_4255ba38-5812-493e-a183-1be0c349dd60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_d508a476-3f64-459f-a510-9989dad24715" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7617500b-2d95-48e4-8f3e-534d22c23d68" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_d508a476-3f64-459f-a510-9989dad24715" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_f5d786d7-8aca-4354-ae30-6544055d6f95" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7617500b-2d95-48e4-8f3e-534d22c23d68" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_f5d786d7-8aca-4354-ae30-6544055d6f95" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetNotionalAmount_de23eb82-234e-4edd-9b62-6e047bed6fb8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeAssetNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7617500b-2d95-48e4-8f3e-534d22c23d68" xlink:to="loc_us-gaap_DerivativeAssetNotionalAmount_de23eb82-234e-4edd-9b62-6e047bed6fb8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_238707e3-cb87-42b3-b8c2-a40c1872f860" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7617500b-2d95-48e4-8f3e-534d22c23d68" xlink:to="loc_us-gaap_DerivativeLiabilities_238707e3-cb87-42b3-b8c2-a40c1872f860" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilitiesCurrent_a2d2dfc3-665c-4032-a649-cf2d7468fb47" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7617500b-2d95-48e4-8f3e-534d22c23d68" xlink:to="loc_us-gaap_DerivativeLiabilitiesCurrent_a2d2dfc3-665c-4032-a649-cf2d7468fb47" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilitiesNoncurrent_d6d15156-b566-4b62-adac-56b1adb65322" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7617500b-2d95-48e4-8f3e-534d22c23d68" xlink:to="loc_us-gaap_DerivativeLiabilitiesNoncurrent_d6d15156-b566-4b62-adac-56b1adb65322" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/WMLConvertibleBondConversionOptionDerivativeValuationTechniquesforEmbeddedDerivativeDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#WMLConvertibleBondConversionOptionDerivativeValuationTechniquesforEmbeddedDerivativeDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/WMLConvertibleBondConversionOptionDerivativeValuationTechniquesforEmbeddedDerivativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_10022170-e179-4f43-9cb2-a850c7d6dea6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_9921188d-7bde-4515-a602-0a93c9dbeed1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_10022170-e179-4f43-9cb2-a850c7d6dea6" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_9921188d-7bde-4515-a602-0a93c9dbeed1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_126abde1-5a57-4d1c-a05c-72f03ee1686f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_9921188d-7bde-4515-a602-0a93c9dbeed1" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_126abde1-5a57-4d1c-a05c-72f03ee1686f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_126abde1-5a57-4d1c-a05c-72f03ee1686f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_126abde1-5a57-4d1c-a05c-72f03ee1686f" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_126abde1-5a57-4d1c-a05c-72f03ee1686f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_59c033f6-40b5-463a-87aa-59ca9341c3f5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_126abde1-5a57-4d1c-a05c-72f03ee1686f" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_59c033f6-40b5-463a-87aa-59ca9341c3f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputSharePriceMember_0c9668a8-5024-4346-a569-7cfddb40b179" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MeasurementInputSharePriceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_59c033f6-40b5-463a-87aa-59ca9341c3f5" xlink:to="loc_us-gaap_MeasurementInputSharePriceMember_0c9668a8-5024-4346-a569-7cfddb40b179" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputPriceVolatilityMember_92f13bbc-dcea-478f-b7ad-48c4793a1658" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MeasurementInputPriceVolatilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_59c033f6-40b5-463a-87aa-59ca9341c3f5" xlink:to="loc_us-gaap_MeasurementInputPriceVolatilityMember_92f13bbc-dcea-478f-b7ad-48c4793a1658" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputRiskFreeInterestRateMember_08fe89a0-1a4b-4b32-b39f-392d7b861553" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MeasurementInputRiskFreeInterestRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_59c033f6-40b5-463a-87aa-59ca9341c3f5" xlink:to="loc_us-gaap_MeasurementInputRiskFreeInterestRateMember_08fe89a0-1a4b-4b32-b39f-392d7b861553" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputExpectedTermMember_532858eb-75ae-4276-ab4d-99573251ab65" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MeasurementInputExpectedTermMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_59c033f6-40b5-463a-87aa-59ca9341c3f5" xlink:to="loc_us-gaap_MeasurementInputExpectedTermMember_532858eb-75ae-4276-ab4d-99573251ab65" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputExpectedDividendRateMember_478a98b4-f7a6-487f-81ac-0c27a93838fc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MeasurementInputExpectedDividendRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_59c033f6-40b5-463a-87aa-59ca9341c3f5" xlink:to="loc_us-gaap_MeasurementInputExpectedDividendRateMember_478a98b4-f7a6-487f-81ac-0c27a93838fc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeLiabilityMeasurementInput_35f9c40b-71d6-494c-ba2d-cdc9e37160e1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmbeddedDerivativeLiabilityMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_10022170-e179-4f43-9cb2-a850c7d6dea6" xlink:to="loc_us-gaap_EmbeddedDerivativeLiabilityMeasurementInput_35f9c40b-71d6-494c-ba2d-cdc9e37160e1" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/WMLConvertibleBondConversionOptionDerivativeNarrativeDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#WMLConvertibleBondConversionOptionDerivativeNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/WMLConvertibleBondConversionOptionDerivativeNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_791cbab4-e980-44d9-858c-26a630e85ff2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_6160e9b3-217b-486d-9180-2d6fdb4633b0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_791cbab4-e980-44d9-858c-26a630e85ff2" xlink:to="loc_us-gaap_DerivativeTable_6160e9b3-217b-486d-9180-2d6fdb4633b0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_bab7a3d4-3279-405a-a992-401ce2825b28" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_6160e9b3-217b-486d-9180-2d6fdb4633b0" xlink:to="loc_us-gaap_DebtInstrumentAxis_bab7a3d4-3279-405a-a992-401ce2825b28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_bab7a3d4-3279-405a-a992-401ce2825b28_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_bab7a3d4-3279-405a-a992-401ce2825b28" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_bab7a3d4-3279-405a-a992-401ce2825b28_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_b941bebe-2377-44e4-8c2f-2c1081799822" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_bab7a3d4-3279-405a-a992-401ce2825b28" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_b941bebe-2377-44e4-8c2f-2c1081799822" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WMLConvertibleBondsMember_6c56db82-4636-4a3f-b30a-203aedaf83dc" xlink:href="wynn-20231231.xsd#wynn_WMLConvertibleBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_b941bebe-2377-44e4-8c2f-2c1081799822" xlink:to="loc_wynn_WMLConvertibleBondsMember_6c56db82-4636-4a3f-b30a-203aedaf83dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_2557cb63-0282-4998-99c7-39cec6cfa91d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_6160e9b3-217b-486d-9180-2d6fdb4633b0" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_2557cb63-0282-4998-99c7-39cec6cfa91d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_2557cb63-0282-4998-99c7-39cec6cfa91d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_2557cb63-0282-4998-99c7-39cec6cfa91d" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_2557cb63-0282-4998-99c7-39cec6cfa91d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_06319243-dbc7-471d-8127-d2ab1f45a99e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_2557cb63-0282-4998-99c7-39cec6cfa91d" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_06319243-dbc7-471d-8127-d2ab1f45a99e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_e3b30e3d-ccfd-4b38-b8d1-6585bb06648f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_06319243-dbc7-471d-8127-d2ab1f45a99e" xlink:to="loc_us-gaap_ConvertibleDebtMember_e3b30e3d-ccfd-4b38-b8d1-6585bb06648f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_8aab6218-8db3-4067-b763-ed3d6e34b161" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_6160e9b3-217b-486d-9180-2d6fdb4633b0" xlink:to="loc_dei_LegalEntityAxis_8aab6218-8db3-4067-b763-ed3d6e34b161" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_8aab6218-8db3-4067-b763-ed3d6e34b161_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_8aab6218-8db3-4067-b763-ed3d6e34b161" xlink:to="loc_dei_EntityDomain_8aab6218-8db3-4067-b763-ed3d6e34b161_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_bbf19cfc-d073-4052-a3fd-e50c3f2eb0d3" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_8aab6218-8db3-4067-b763-ed3d6e34b161" xlink:to="loc_dei_EntityDomain_bbf19cfc-d073-4052-a3fd-e50c3f2eb0d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnMacauLimitedMember_d8aeb6d5-2b57-4351-a1b8-f72af1be167f" xlink:href="wynn-20231231.xsd#wynn_WynnMacauLimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_bbf19cfc-d073-4052-a3fd-e50c3f2eb0d3" xlink:to="loc_wynn_WynnMacauLimitedMember_d8aeb6d5-2b57-4351-a1b8-f72af1be167f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_c312d62b-642e-4751-a2d3-e043a7d82538" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentUnamortizedDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_791cbab4-e980-44d9-858c-26a630e85ff2" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_c312d62b-642e-4751-a2d3-e043a7d82538" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_50186343-c2fb-4eeb-811a-60b68b0a6e3e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_791cbab4-e980-44d9-858c-26a630e85ff2" xlink:to="loc_us-gaap_DerivativeLiabilities_50186343-c2fb-4eeb-811a-60b68b0a6e3e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration_6d79096c-ca33-4ec7-9f79-6a95a9f7ae77" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilities_50186343-c2fb-4eeb-811a-60b68b0a6e3e" xlink:to="loc_us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration_6d79096c-ca33-4ec7-9f79-6a95a9f7ae77" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet_a5d0447c-ad54-436c-b20d-a31a493dd583" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_791cbab4-e980-44d9-858c-26a630e85ff2" xlink:to="loc_us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet_a5d0447c-ad54-436c-b20d-a31a493dd583" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/StockholdersDeficitDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#StockholdersDeficitDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/StockholdersDeficitDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityClassOfTreasuryStockLineItems_c7768a35-cb56-48cb-af28-5fe42c4a3bfa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityClassOfTreasuryStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfTreasuryStockTable_f13ebea1-7897-4c90-9e8b-c3dd7439198e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfTreasuryStockTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_c7768a35-cb56-48cb-af28-5fe42c4a3bfa" xlink:to="loc_us-gaap_ClassOfTreasuryStockTable_f13ebea1-7897-4c90-9e8b-c3dd7439198e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramAxis_94fe46f7-b230-4102-a59c-aa928b73a581" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfTreasuryStockTable_f13ebea1-7897-4c90-9e8b-c3dd7439198e" xlink:to="loc_us-gaap_ShareRepurchaseProgramAxis_94fe46f7-b230-4102-a59c-aa928b73a581" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_94fe46f7-b230-4102-a59c-aa928b73a581_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_94fe46f7-b230-4102-a59c-aa928b73a581" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_94fe46f7-b230-4102-a59c-aa928b73a581_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_08de8616-f68d-419c-b650-3a4e8aafcae0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_94fe46f7-b230-4102-a59c-aa928b73a581" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_08de8616-f68d-419c-b650-3a4e8aafcae0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_April2016EquityRepurchaseProgramMember_c3f7aebf-e1bc-42ea-8936-f60569b382b4" xlink:href="wynn-20231231.xsd#wynn_April2016EquityRepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareRepurchaseProgramDomain_08de8616-f68d-419c-b650-3a4e8aafcae0" xlink:to="loc_wynn_April2016EquityRepurchaseProgramMember_c3f7aebf-e1bc-42ea-8936-f60569b382b4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsAxis_57cddf0f-1898-44cd-be8e-2f5e33c03afd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DividendsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfTreasuryStockTable_f13ebea1-7897-4c90-9e8b-c3dd7439198e" xlink:to="loc_us-gaap_DividendsAxis_57cddf0f-1898-44cd-be8e-2f5e33c03afd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsDomain_57cddf0f-1898-44cd-be8e-2f5e33c03afd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DividendsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DividendsAxis_57cddf0f-1898-44cd-be8e-2f5e33c03afd" xlink:to="loc_us-gaap_DividendsDomain_57cddf0f-1898-44cd-be8e-2f5e33c03afd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsDomain_8b2a2b11-132a-4467-af6b-57179e3c9c26" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DividendsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DividendsAxis_57cddf0f-1898-44cd-be8e-2f5e33c03afd" xlink:to="loc_us-gaap_DividendsDomain_8b2a2b11-132a-4467-af6b-57179e3c9c26" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendPaidMember_cf5f439a-a45e-4e80-ad30-616c6448c325" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DividendPaidMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsDomain_8b2a2b11-132a-4467-af6b-57179e3c9c26" xlink:to="loc_us-gaap_DividendPaidMember_cf5f439a-a45e-4e80-ad30-616c6448c325" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_694bf646-2d31-4beb-9464-f8644f3ff3a1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfTreasuryStockTable_f13ebea1-7897-4c90-9e8b-c3dd7439198e" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_694bf646-2d31-4beb-9464-f8644f3ff3a1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_694bf646-2d31-4beb-9464-f8644f3ff3a1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_694bf646-2d31-4beb-9464-f8644f3ff3a1" xlink:to="loc_us-gaap_EquityComponentDomain_694bf646-2d31-4beb-9464-f8644f3ff3a1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_e4a4594f-7f38-4dd4-bc15-5c91530f7879" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_694bf646-2d31-4beb-9464-f8644f3ff3a1" xlink:to="loc_us-gaap_EquityComponentDomain_e4a4594f-7f38-4dd4-bc15-5c91530f7879" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_04fc2e0e-e58d-47d0-8079-68b7abc10377" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_e4a4594f-7f38-4dd4-bc15-5c91530f7879" xlink:to="loc_us-gaap_RetainedEarningsMember_04fc2e0e-e58d-47d0-8079-68b7abc10377" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_7e3e1488-cb4c-4605-bba4-f92eef1b2690" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfTreasuryStockTable_f13ebea1-7897-4c90-9e8b-c3dd7439198e" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_7e3e1488-cb4c-4605-bba4-f92eef1b2690" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_7e3e1488-cb4c-4605-bba4-f92eef1b2690_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_7e3e1488-cb4c-4605-bba4-f92eef1b2690" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_7e3e1488-cb4c-4605-bba4-f92eef1b2690_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_522a2d46-6562-4467-bd38-1d34d36d5a05" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_7e3e1488-cb4c-4605-bba4-f92eef1b2690" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_522a2d46-6562-4467-bd38-1d34d36d5a05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_6aea94e1-c5f7-4fde-b66e-367c8ec0ac3e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_522a2d46-6562-4467-bd38-1d34d36d5a05" xlink:to="loc_us-gaap_SubsequentEventMember_6aea94e1-c5f7-4fde-b66e-367c8ec0ac3e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_40225758-9467-4eda-a0ea-ba05643e83b8" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfTreasuryStockTable_f13ebea1-7897-4c90-9e8b-c3dd7439198e" xlink:to="loc_srt_OwnershipAxis_40225758-9467-4eda-a0ea-ba05643e83b8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_40225758-9467-4eda-a0ea-ba05643e83b8_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_40225758-9467-4eda-a0ea-ba05643e83b8" xlink:to="loc_srt_OwnershipDomain_40225758-9467-4eda-a0ea-ba05643e83b8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_12d45e47-7b73-41ed-944a-9e2b76346038" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_40225758-9467-4eda-a0ea-ba05643e83b8" xlink:to="loc_srt_OwnershipDomain_12d45e47-7b73-41ed-944a-9e2b76346038" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnPalaceandWynnMacauMember_2469c489-92ad-4e57-8044-39be7e246980" xlink:href="wynn-20231231.xsd#wynn_WynnPalaceandWynnMacauMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_12d45e47-7b73-41ed-944a-9e2b76346038" xlink:to="loc_wynn_WynnPalaceandWynnMacauMember_2469c489-92ad-4e57-8044-39be7e246980" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnResortsLtdMember_91e6d61f-0f75-4fc8-a914-a6d9a3642b08" xlink:href="wynn-20231231.xsd#wynn_WynnResortsLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_12d45e47-7b73-41ed-944a-9e2b76346038" xlink:to="loc_wynn_WynnResortsLtdMember_91e6d61f-0f75-4fc8-a914-a6d9a3642b08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_500a9e25-a170-4ba5-a0b2-d5f969d64ab2" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfTreasuryStockTable_f13ebea1-7897-4c90-9e8b-c3dd7439198e" xlink:to="loc_srt_CounterpartyNameAxis_500a9e25-a170-4ba5-a0b2-d5f969d64ab2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_500a9e25-a170-4ba5-a0b2-d5f969d64ab2_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_500a9e25-a170-4ba5-a0b2-d5f969d64ab2" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_500a9e25-a170-4ba5-a0b2-d5f969d64ab2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_d9645e7e-2f79-47ed-8374-924ebb675f3e" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_500a9e25-a170-4ba5-a0b2-d5f969d64ab2" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_d9645e7e-2f79-47ed-8374-924ebb675f3e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_GoldmanSachsInternationalMember_9995164c-7aa3-4446-86ac-e1c947f06543" xlink:href="wynn-20231231.xsd#wynn_GoldmanSachsInternationalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_d9645e7e-2f79-47ed-8374-924ebb675f3e" xlink:to="loc_wynn_GoldmanSachsInternationalMember_9995164c-7aa3-4446-86ac-e1c947f06543" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis_5ef8c1cd-33df-439f-a195-aeaa4dfbef0a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfTreasuryStockTable_f13ebea1-7897-4c90-9e8b-c3dd7439198e" xlink:to="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis_5ef8c1cd-33df-439f-a195-aeaa4dfbef0a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseTypeDomain_5ef8c1cd-33df-439f-a195-aeaa4dfbef0a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsSoldUnderAgreementsToRepurchaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis_5ef8c1cd-33df-439f-a195-aeaa4dfbef0a" xlink:to="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseTypeDomain_5ef8c1cd-33df-439f-a195-aeaa4dfbef0a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseTypeDomain_0b01fbb5-eaa2-4da7-818f-9e60908fb368" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsSoldUnderAgreementsToRepurchaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis_5ef8c1cd-33df-439f-a195-aeaa4dfbef0a" xlink:to="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseTypeDomain_0b01fbb5-eaa2-4da7-818f-9e60908fb368" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_SecuritiesLendingAgreementMember_cafb90e1-bcc7-42d2-b7f8-91a5b49c037c" xlink:href="wynn-20231231.xsd#wynn_SecuritiesLendingAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseTypeDomain_0b01fbb5-eaa2-4da7-818f-9e60908fb368" xlink:to="loc_wynn_SecuritiesLendingAgreementMember_cafb90e1-bcc7-42d2-b7f8-91a5b49c037c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_50cb8ed6-77eb-4481-857e-5a888ba1bc39" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfTreasuryStockTable_f13ebea1-7897-4c90-9e8b-c3dd7439198e" xlink:to="loc_dei_LegalEntityAxis_50cb8ed6-77eb-4481-857e-5a888ba1bc39" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_50cb8ed6-77eb-4481-857e-5a888ba1bc39_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_50cb8ed6-77eb-4481-857e-5a888ba1bc39" xlink:to="loc_dei_EntityDomain_50cb8ed6-77eb-4481-857e-5a888ba1bc39_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_fe2b48dd-a527-4632-b278-e3bf68887d53" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_50cb8ed6-77eb-4481-857e-5a888ba1bc39" xlink:to="loc_dei_EntityDomain_fe2b48dd-a527-4632-b278-e3bf68887d53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WMCaymanIMember_57085cb1-3260-4497-86cb-97987b0329b3" xlink:href="wynn-20231231.xsd#wynn_WMCaymanIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_fe2b48dd-a527-4632-b278-e3bf68887d53" xlink:to="loc_wynn_WMCaymanIMember_57085cb1-3260-4497-86cb-97987b0329b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_CrownAcquisitionsIncMember_deabe8eb-4c4a-4e84-9255-1939eccc4863" xlink:href="wynn-20231231.xsd#wynn_CrownAcquisitionsIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_fe2b48dd-a527-4632-b278-e3bf68887d53" xlink:to="loc_wynn_CrownAcquisitionsIncMember_deabe8eb-4c4a-4e84-9255-1939eccc4863" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_d036780f-5c19-4547-8e88-29de4c3ebc16" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfTreasuryStockTable_f13ebea1-7897-4c90-9e8b-c3dd7439198e" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_d036780f-5c19-4547-8e88-29de4c3ebc16" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_d036780f-5c19-4547-8e88-29de4c3ebc16_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_d036780f-5c19-4547-8e88-29de4c3ebc16" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_d036780f-5c19-4547-8e88-29de4c3ebc16_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_b85c12d1-4316-4faa-8047-306be757d75a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_d036780f-5c19-4547-8e88-29de4c3ebc16" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_b85c12d1-4316-4faa-8047-306be757d75a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_RetailJointVentureMember_fd3de0ae-38ca-4329-9b72-7f903625a8a3" xlink:href="wynn-20231231.xsd#wynn_RetailJointVentureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_b85c12d1-4316-4faa-8047-306be757d75a" xlink:to="loc_wynn_RetailJointVentureMember_fd3de0ae-38ca-4329-9b72-7f903625a8a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_125ff87b-7dc2-4237-905d-85990f87f773" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_c7768a35-cb56-48cb-af28-5fe42c4a3bfa" xlink:to="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_125ff87b-7dc2-4237-905d-85990f87f773" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_3014706c-088e-4e1d-83e2-1d30181f0175" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_c7768a35-cb56-48cb-af28-5fe42c4a3bfa" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_3014706c-088e-4e1d-83e2-1d30181f0175" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_9881a9fd-dc92-4db6-8450-8b91e1af3983" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockAcquiredAverageCostPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_c7768a35-cb56-48cb-af28-5fe42c4a3bfa" xlink:to="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_9881a9fd-dc92-4db6-8450-8b91e1af3983" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_28bba812-8817-4dd3-929a-a1162746486e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_c7768a35-cb56-48cb-af28-5fe42c4a3bfa" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_28bba812-8817-4dd3-929a-a1162746486e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_e4466ef3-e464-4602-b2c0-471f455982d3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_c7768a35-cb56-48cb-af28-5fe42c4a3bfa" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_e4466ef3-e464-4602-b2c0-471f455982d3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareCashPaid_46c6a74b-96ee-40f9-8645-86fb417942d0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockDividendsPerShareCashPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_c7768a35-cb56-48cb-af28-5fe42c4a3bfa" xlink:to="loc_us-gaap_CommonStockDividendsPerShareCashPaid_46c6a74b-96ee-40f9-8645-86fb417942d0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_1cdbdd3c-7498-4f1f-a62b-ccbec860461b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DividendsCommonStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_c7768a35-cb56-48cb-af28-5fe42c4a3bfa" xlink:to="loc_us-gaap_DividendsCommonStockCash_1cdbdd3c-7498-4f1f-a62b-ccbec860461b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableAmountPerShare_230bef2c-8392-418b-8403-bb31cf5a560f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DividendsPayableAmountPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_c7768a35-cb56-48cb-af28-5fe42c4a3bfa" xlink:to="loc_us-gaap_DividendsPayableAmountPerShare_230bef2c-8392-418b-8403-bb31cf5a560f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_8f7785a0-3d5d-417d-8a94-74be521c551d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MinorityInterestOwnershipPercentageByParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_c7768a35-cb56-48cb-af28-5fe42c4a3bfa" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_8f7785a0-3d5d-417d-8a94-74be521c551d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_5284687a-fa7e-4113-abd6-b18bb39dd7a4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_c7768a35-cb56-48cb-af28-5fe42c4a3bfa" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_5284687a-fa7e-4113-abd6-b18bb39dd7a4" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_42d9ea1c-dcea-4a12-a95a-bc6970cf8ffa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_c7768a35-cb56-48cb-af28-5fe42c4a3bfa" xlink:to="loc_us-gaap_CommonStockSharesIssued_42d9ea1c-dcea-4a12-a95a-bc6970cf8ffa" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_CommonStockSharesReturned_4a36171d-402c-419a-a757-452b44135277" xlink:href="wynn-20231231.xsd#wynn_CommonStockSharesReturned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_c7768a35-cb56-48cb-af28-5fe42c4a3bfa" xlink:to="loc_wynn_CommonStockSharesReturned_4a36171d-402c-419a-a757-452b44135277" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_ad6440e1-82e3-4179-91cb-d32b41fd99c2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_c7768a35-cb56-48cb-af28-5fe42c4a3bfa" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_ad6440e1-82e3-4179-91cb-d32b41fd99c2" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_89b31bde-3e81-4bd9-81ab-95588e9da6c7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_c7768a35-cb56-48cb-af28-5fe42c4a3bfa" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_89b31bde-3e81-4bd9-81ab-95588e9da6c7" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromRealEstateAndRealEstateJointVentures_981ba2fe-9992-4e4b-817d-1154e5ee9ac1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromRealEstateAndRealEstateJointVentures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_c7768a35-cb56-48cb-af28-5fe42c4a3bfa" xlink:to="loc_us-gaap_ProceedsFromRealEstateAndRealEstateJointVentures_981ba2fe-9992-4e4b-817d-1154e5ee9ac1" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_2af365de-1366-4d99-914a-9a005b4f37e8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_c7768a35-cb56-48cb-af28-5fe42c4a3bfa" xlink:to="loc_us-gaap_AdditionalPaidInCapital_2af365de-1366-4d99-914a-9a005b4f37e8" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance_a7fa1fd2-b816-40c2-a33a-9319d2d732c0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_c7768a35-cb56-48cb-af28-5fe42c4a3bfa" xlink:to="loc_us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance_a7fa1fd2-b816-40c2-a33a-9319d2d732c0" xlink:type="arc" order="16"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/FairValueMeasurementsDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#FairValueMeasurementsDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/FairValueMeasurementsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_c68774fd-e179-4b58-a5d3-daaaadd634da" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_f7552735-2b10-40a3-8286-74afd241825f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_c68774fd-e179-4b58-a5d3-daaaadd634da" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_f7552735-2b10-40a3-8286-74afd241825f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_0fbead1d-8ea7-48a3-aa78-358a73a5fd97" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_f7552735-2b10-40a3-8286-74afd241825f" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_0fbead1d-8ea7-48a3-aa78-358a73a5fd97" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_0fbead1d-8ea7-48a3-aa78-358a73a5fd97_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_0fbead1d-8ea7-48a3-aa78-358a73a5fd97" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_0fbead1d-8ea7-48a3-aa78-358a73a5fd97_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_3aba265d-31f9-4778-a1f5-10d34fba0e20" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_0fbead1d-8ea7-48a3-aa78-358a73a5fd97" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_3aba265d-31f9-4778-a1f5-10d34fba0e20" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_4ae223e0-daef-4b22-895b-9e7eeb5475ad" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_3aba265d-31f9-4778-a1f5-10d34fba0e20" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_4ae223e0-daef-4b22-895b-9e7eeb5475ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_e190009e-7f8f-4408-a352-b165decb1abd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_f7552735-2b10-40a3-8286-74afd241825f" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_e190009e-7f8f-4408-a352-b165decb1abd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e190009e-7f8f-4408-a352-b165decb1abd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_e190009e-7f8f-4408-a352-b165decb1abd" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e190009e-7f8f-4408-a352-b165decb1abd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4472a8ec-fbb8-4ca4-8301-c50f1ddd58fa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_e190009e-7f8f-4408-a352-b165decb1abd" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4472a8ec-fbb8-4ca4-8301-c50f1ddd58fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_fe9b0127-3ed9-49d0-a309-3b3c4c708d56" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4472a8ec-fbb8-4ca4-8301-c50f1ddd58fa" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_fe9b0127-3ed9-49d0-a309-3b3c4c708d56" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_8d16c52b-2646-46f6-b5e7-84a4478a0ee5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4472a8ec-fbb8-4ca4-8301-c50f1ddd58fa" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_8d16c52b-2646-46f6-b5e7-84a4478a0ee5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_b25fd5f0-8bba-439d-aedb-ddac6100ba49" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4472a8ec-fbb8-4ca4-8301-c50f1ddd58fa" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_b25fd5f0-8bba-439d-aedb-ddac6100ba49" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_c25a0b64-eb7b-48ff-a736-8b8cfdd6d4d9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_c68774fd-e179-4b58-a5d3-daaaadd634da" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_c25a0b64-eb7b-48ff-a736-8b8cfdd6d4d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashEquivalentsAtCarryingValue_e75f5865-d69b-4463-b893-1878f5358f26" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_c25a0b64-eb7b-48ff-a736-8b8cfdd6d4d9" xlink:to="loc_us-gaap_CashEquivalentsAtCarryingValue_e75f5865-d69b-4463-b893-1878f5358f26" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalents_e0445a55-9ab3-46d9-891b-a297dbbe5f5c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedCashAndCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_c25a0b64-eb7b-48ff-a736-8b8cfdd6d4d9" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalents_e0445a55-9ab3-46d9-891b-a297dbbe5f5c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashEquivalentsCurrent_1e52c2d3-8be0-48a2-bb82-8071201b718a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedCashEquivalentsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_c25a0b64-eb7b-48ff-a736-8b8cfdd6d4d9" xlink:to="loc_us-gaap_RestrictedCashEquivalentsCurrent_1e52c2d3-8be0-48a2-bb82-8071201b718a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_80290a18-f094-4d3a-be32-f9b40a247862" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_c25a0b64-eb7b-48ff-a736-8b8cfdd6d4d9" xlink:to="loc_us-gaap_DerivativeAssets_80290a18-f094-4d3a-be32-f9b40a247862" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_5251a8e0-d7ea-4f12-b12c-2595e95e3b4d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_c68774fd-e179-4b58-a5d3-daaaadd634da" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_5251a8e0-d7ea-4f12-b12c-2595e95e3b4d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_0d803ded-c94e-4623-9751-0541a316c4bb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_5251a8e0-d7ea-4f12-b12c-2595e95e3b4d" xlink:to="loc_us-gaap_DerivativeLiabilities_0d803ded-c94e-4623-9751-0541a316c4bb" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/BenefitPlansDefinedContributionPlanDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#BenefitPlansDefinedContributionPlanDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/BenefitPlansDefinedContributionPlanDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_fc0544fb-fb7c-411f-bcee-f88917d2253a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedContributionPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanTable_8722ba70-b44b-42ca-b529-2ada05730b11" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedContributionPlanTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_fc0544fb-fb7c-411f-bcee-f88917d2253a" xlink:to="loc_us-gaap_DefinedContributionPlanTable_8722ba70-b44b-42ca-b529-2ada05730b11" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_e28c742c-24df-4cf3-bbc2-95ccfb52be3d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedContributionPlanTable_8722ba70-b44b-42ca-b529-2ada05730b11" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_e28c742c-24df-4cf3-bbc2-95ccfb52be3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_e28c742c-24df-4cf3-bbc2-95ccfb52be3d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_e28c742c-24df-4cf3-bbc2-95ccfb52be3d" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_e28c742c-24df-4cf3-bbc2-95ccfb52be3d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_2cab3685-d8d0-499a-96ec-738f819d0034" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_e28c742c-24df-4cf3-bbc2-95ccfb52be3d" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_2cab3685-d8d0-499a-96ec-738f819d0034" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_55930632-a55d-4d77-af86-447352ea97c7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DomesticPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_2cab3685-d8d0-499a-96ec-738f819d0034" xlink:to="loc_us-gaap_DomesticPlanMember_55930632-a55d-4d77-af86-447352ea97c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_1750b482-9d72-4a8b-bbaa-c01d4a940230" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_55930632-a55d-4d77-af86-447352ea97c7" xlink:to="loc_country_US_1750b482-9d72-4a8b-bbaa-c01d4a940230" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_35496c25-4119-4651-b1d4-15e386f3e2b1" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedContributionPlanTable_8722ba70-b44b-42ca-b529-2ada05730b11" xlink:to="loc_dei_LegalEntityAxis_35496c25-4119-4651-b1d4-15e386f3e2b1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_35496c25-4119-4651-b1d4-15e386f3e2b1_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_35496c25-4119-4651-b1d4-15e386f3e2b1" xlink:to="loc_dei_EntityDomain_35496c25-4119-4651-b1d4-15e386f3e2b1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_09065726-b3d6-4381-bffc-2cde3c84db5e" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_35496c25-4119-4651-b1d4-15e386f3e2b1" xlink:to="loc_dei_EntityDomain_09065726-b3d6-4381-bffc-2cde3c84db5e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnResortsMacauMember_89e6a972-b366-4518-8dc7-8c1c01cd0eaf" xlink:href="wynn-20231231.xsd#wynn_WynnResortsMacauMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_09065726-b3d6-4381-bffc-2cde3c84db5e" xlink:to="loc_wynn_WynnResortsMacauMember_89e6a972-b366-4518-8dc7-8c1c01cd0eaf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_9a8e819d-aa86-4e88-8754-2c57df6beff5" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedContributionPlanTable_8722ba70-b44b-42ca-b529-2ada05730b11" xlink:to="loc_srt_RangeAxis_9a8e819d-aa86-4e88-8754-2c57df6beff5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_9a8e819d-aa86-4e88-8754-2c57df6beff5_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_9a8e819d-aa86-4e88-8754-2c57df6beff5" xlink:to="loc_srt_RangeMember_9a8e819d-aa86-4e88-8754-2c57df6beff5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_ef15bf2b-d0e4-4878-9948-3f2437d83a85" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_9a8e819d-aa86-4e88-8754-2c57df6beff5" xlink:to="loc_srt_RangeMember_ef15bf2b-d0e4-4878-9948-3f2437d83a85" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_38f9e942-97a5-497f-95a3-3cb106d9ac00" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_ef15bf2b-d0e4-4878-9948-3f2437d83a85" xlink:to="loc_srt_MaximumMember_38f9e942-97a5-497f-95a3-3cb106d9ac00" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanNameAxis_cf9748cb-d0ef-465f-8915-c908b954f22a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedContributionPlanTable_8722ba70-b44b-42ca-b529-2ada05730b11" xlink:to="loc_us-gaap_RetirementPlanNameAxis_cf9748cb-d0ef-465f-8915-c908b954f22a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanNameDomain_cf9748cb-d0ef-465f-8915-c908b954f22a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanNameAxis_cf9748cb-d0ef-465f-8915-c908b954f22a" xlink:to="loc_us-gaap_RetirementPlanNameDomain_cf9748cb-d0ef-465f-8915-c908b954f22a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanNameDomain_2d264046-8f7b-4058-a496-d254cc68d615" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanNameAxis_cf9748cb-d0ef-465f-8915-c908b954f22a" xlink:to="loc_us-gaap_RetirementPlanNameDomain_2d264046-8f7b-4058-a496-d254cc68d615" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnMacauPlanMember_f47b9c0e-8781-48c1-b180-30d87bcfa462" xlink:href="wynn-20231231.xsd#wynn_WynnMacauPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_2d264046-8f7b-4058-a496-d254cc68d615" xlink:to="loc_wynn_WynnMacauPlanMember_f47b9c0e-8781-48c1-b180-30d87bcfa462" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_CentralProvidentFundSystemMember_204aa410-25ce-4646-9b9c-60ff61e34b1b" xlink:href="wynn-20231231.xsd#wynn_CentralProvidentFundSystemMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_2d264046-8f7b-4058-a496-d254cc68d615" xlink:to="loc_wynn_CentralProvidentFundSystemMember_204aa410-25ce-4646-9b9c-60ff61e34b1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch_1e663adf-fc9f-4750-91ce-ead05e04c81d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_fc0544fb-fb7c-411f-bcee-f88917d2253a" xlink:to="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch_1e663adf-fc9f-4750-91ce-ead05e04c81d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_cc8275f5-1e77-4f0e-9f8c-19250bb053cc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_fc0544fb-fb7c-411f-bcee-f88917d2253a" xlink:to="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_cc8275f5-1e77-4f0e-9f8c-19250bb053cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanCostRecognized_e5258c5d-0469-40ae-94ec-bba152744b05" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedContributionPlanCostRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_fc0544fb-fb7c-411f-bcee-f88917d2253a" xlink:to="loc_us-gaap_DefinedContributionPlanCostRecognized_e5258c5d-0469-40ae-94ec-bba152744b05" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent_daf34a3c-925b-4a21-9c1a-6e8eb7ae0ee4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_fc0544fb-fb7c-411f-bcee-f88917d2253a" xlink:to="loc_us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent_daf34a3c-925b-4a21-9c1a-6e8eb7ae0ee4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DefinedContributionPlanMinimumAnnualContributionsPerEmployeePercent_03bcdfda-003d-42d1-b732-bfbf238be098" xlink:href="wynn-20231231.xsd#wynn_DefinedContributionPlanMinimumAnnualContributionsPerEmployeePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_fc0544fb-fb7c-411f-bcee-f88917d2253a" xlink:to="loc_wynn_DefinedContributionPlanMinimumAnnualContributionsPerEmployeePercent_03bcdfda-003d-42d1-b732-bfbf238be098" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage_64004533-e3af-4fe3-bbf6-c31ae9d66b83" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_fc0544fb-fb7c-411f-bcee-f88917d2253a" xlink:to="loc_us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage_64004533-e3af-4fe3-bbf6-c31ae9d66b83" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DefinedContributionPlanEmployerMatchingContributionVestingPeriod_cb6e25b7-8c16-427e-b789-8897a0396bda" xlink:href="wynn-20231231.xsd#wynn_DefinedContributionPlanEmployerMatchingContributionVestingPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_fc0544fb-fb7c-411f-bcee-f88917d2253a" xlink:to="loc_wynn_DefinedContributionPlanEmployerMatchingContributionVestingPeriod_cb6e25b7-8c16-427e-b789-8897a0396bda" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/BenefitPlansPensionPlanDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#BenefitPlansPensionPlanDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/BenefitPlansPensionPlanDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_60276b85-0b3c-4d3b-aae2-5887158abe14" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_aec6ca4d-4d05-490f-8185-889e498b2aa1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_60276b85-0b3c-4d3b-aae2-5887158abe14" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_aec6ca4d-4d05-490f-8185-889e498b2aa1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanNameAxis_5ed9d404-459f-440b-a976-2490a8c7562a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_aec6ca4d-4d05-490f-8185-889e498b2aa1" xlink:to="loc_us-gaap_RetirementPlanNameAxis_5ed9d404-459f-440b-a976-2490a8c7562a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanNameDomain_5ed9d404-459f-440b-a976-2490a8c7562a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanNameAxis_5ed9d404-459f-440b-a976-2490a8c7562a" xlink:to="loc_us-gaap_RetirementPlanNameDomain_5ed9d404-459f-440b-a976-2490a8c7562a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanNameDomain_11bf66ff-0bc2-43ad-8079-6707e2b7b462" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanNameAxis_5ed9d404-459f-440b-a976-2490a8c7562a" xlink:to="loc_us-gaap_RetirementPlanNameDomain_11bf66ff-0bc2-43ad-8079-6707e2b7b462" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_SouthernNevadaCulinaryandBartendersPensionPlanMember_5304b6cf-8256-4ef6-b57b-fc686613f273" xlink:href="wynn-20231231.xsd#wynn_SouthernNevadaCulinaryandBartendersPensionPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_11bf66ff-0bc2-43ad-8079-6707e2b7b462" xlink:to="loc_wynn_SouthernNevadaCulinaryandBartendersPensionPlanMember_5304b6cf-8256-4ef6-b57b-fc686613f273" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WesternConferenceOfTeamstersPensionTrustFundMember_7065da99-f7bf-4e70-9aa9-6b1be47a7a27" xlink:href="wynn-20231231.xsd#wynn_WesternConferenceOfTeamstersPensionTrustFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_11bf66ff-0bc2-43ad-8079-6707e2b7b462" xlink:to="loc_wynn_WesternConferenceOfTeamstersPensionTrustFundMember_7065da99-f7bf-4e70-9aa9-6b1be47a7a27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_e4ee8b32-169c-4afa-8173-605ad15dc928" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_aec6ca4d-4d05-490f-8185-889e498b2aa1" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_e4ee8b32-169c-4afa-8173-605ad15dc928" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_e4ee8b32-169c-4afa-8173-605ad15dc928_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_e4ee8b32-169c-4afa-8173-605ad15dc928" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_e4ee8b32-169c-4afa-8173-605ad15dc928_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_b5cab7a8-57ea-44c2-b4a2-598cd905c679" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_e4ee8b32-169c-4afa-8173-605ad15dc928" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_b5cab7a8-57ea-44c2-b4a2-598cd905c679" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_dc69ab13-6117-4f39-bc5a-4c0cd2f830fa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_b5cab7a8-57ea-44c2-b4a2-598cd905c679" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_dc69ab13-6117-4f39-bc5a-4c0cd2f830fa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlanEmployerContributionCost_c1e3b64b-0632-458b-bd37-6ef87e75d1d3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MultiemployerPlanEmployerContributionCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_60276b85-0b3c-4d3b-aae2-5887158abe14" xlink:to="loc_us-gaap_MultiemployerPlanEmployerContributionCost_c1e3b64b-0632-458b-bd37-6ef87e75d1d3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_TotalContributionThresholdPercentage_fd9c7cab-5319-4054-aa48-4d37279e6ab1" xlink:href="wynn-20231231.xsd#wynn_TotalContributionThresholdPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_60276b85-0b3c-4d3b-aae2-5887158abe14" xlink:to="loc_wynn_TotalContributionThresholdPercentage_fd9c7cab-5319-4054-aa48-4d37279e6ab1" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/StockBasedCompensationAdditionalInformationDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#StockBasedCompensationAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/StockBasedCompensationAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cab7b14d-066d-4d83-9d1a-6f2fa9b9eeba" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1d8be952-c331-4884-a853-7b37ab0a62c5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cab7b14d-066d-4d83-9d1a-6f2fa9b9eeba" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1d8be952-c331-4884-a853-7b37ab0a62c5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_72a7596f-2537-4081-b488-065fa0ea89e7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1d8be952-c331-4884-a853-7b37ab0a62c5" xlink:to="loc_us-gaap_PlanNameAxis_72a7596f-2537-4081-b488-065fa0ea89e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_72a7596f-2537-4081-b488-065fa0ea89e7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_72a7596f-2537-4081-b488-065fa0ea89e7" xlink:to="loc_us-gaap_PlanNameDomain_72a7596f-2537-4081-b488-065fa0ea89e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_a78941fa-18f8-46cb-ac03-74cc38f231c0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_72a7596f-2537-4081-b488-065fa0ea89e7" xlink:to="loc_us-gaap_PlanNameDomain_a78941fa-18f8-46cb-ac03-74cc38f231c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnResortsLimited2014OmnibusIncentivePlanMember_44f09531-7560-4bea-81d0-54e160d41a64" xlink:href="wynn-20231231.xsd#wynn_WynnResortsLimited2014OmnibusIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_a78941fa-18f8-46cb-ac03-74cc38f231c0" xlink:to="loc_wynn_WynnResortsLimited2014OmnibusIncentivePlanMember_44f09531-7560-4bea-81d0-54e160d41a64" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WMLShareOptionPlanMember_38b73f6e-f75f-4592-829f-2b880df68aeb" xlink:href="wynn-20231231.xsd#wynn_WMLShareOptionPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_a78941fa-18f8-46cb-ac03-74cc38f231c0" xlink:to="loc_wynn_WMLShareOptionPlanMember_38b73f6e-f75f-4592-829f-2b880df68aeb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WMLShareAwardPlanMember_5254eec8-3279-401f-8a92-a1b561cff608" xlink:href="wynn-20231231.xsd#wynn_WMLShareAwardPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_a78941fa-18f8-46cb-ac03-74cc38f231c0" xlink:to="loc_wynn_WMLShareAwardPlanMember_5254eec8-3279-401f-8a92-a1b561cff608" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnInteractiveLtd2020OmnibusIncentivePlanMember_67f2d26e-d576-48b0-935b-a5b2ea9571c5" xlink:href="wynn-20231231.xsd#wynn_WynnInteractiveLtd2020OmnibusIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_a78941fa-18f8-46cb-ac03-74cc38f231c0" xlink:to="loc_wynn_WynnInteractiveLtd2020OmnibusIncentivePlanMember_67f2d26e-d576-48b0-935b-a5b2ea9571c5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_f6afd2db-2521-45cf-90fd-e5c79a5eff29" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1d8be952-c331-4884-a853-7b37ab0a62c5" xlink:to="loc_us-gaap_AwardTypeAxis_f6afd2db-2521-45cf-90fd-e5c79a5eff29" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f6afd2db-2521-45cf-90fd-e5c79a5eff29_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_f6afd2db-2521-45cf-90fd-e5c79a5eff29" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f6afd2db-2521-45cf-90fd-e5c79a5eff29_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6175aa14-5c73-4b5d-b714-ceeb5ac1deae" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_f6afd2db-2521-45cf-90fd-e5c79a5eff29" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6175aa14-5c73-4b5d-b714-ceeb5ac1deae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WMLShareAwardPlanMember_5122458b-68d9-4a3a-b2d2-74c7467e0a68" xlink:href="wynn-20231231.xsd#wynn_WMLShareAwardPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6175aa14-5c73-4b5d-b714-ceeb5ac1deae" xlink:to="loc_wynn_WMLShareAwardPlanMember_5122458b-68d9-4a3a-b2d2-74c7467e0a68" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_a2e3d982-5843-40d4-8195-281310ae53f8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6175aa14-5c73-4b5d-b714-ceeb5ac1deae" xlink:to="loc_us-gaap_PerformanceSharesMember_a2e3d982-5843-40d4-8195-281310ae53f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_5a9a6b36-c64d-482d-ba1f-943cf5b18f1c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VestingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1d8be952-c331-4884-a853-7b37ab0a62c5" xlink:to="loc_us-gaap_VestingAxis_5a9a6b36-c64d-482d-ba1f-943cf5b18f1c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_5a9a6b36-c64d-482d-ba1f-943cf5b18f1c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_5a9a6b36-c64d-482d-ba1f-943cf5b18f1c" xlink:to="loc_us-gaap_VestingDomain_5a9a6b36-c64d-482d-ba1f-943cf5b18f1c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_97cfaab9-5153-46d9-b3a0-6cd9c22389af" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_5a9a6b36-c64d-482d-ba1f-943cf5b18f1c" xlink:to="loc_us-gaap_VestingDomain_97cfaab9-5153-46d9-b3a0-6cd9c22389af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_973ad542-856d-4ff3-bfdc-4588c3668325" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationAwardTrancheOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_97cfaab9-5153-46d9-b3a0-6cd9c22389af" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_973ad542-856d-4ff3-bfdc-4588c3668325" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_e7ecaf03-0884-4d2b-ab0c-17d25c787ceb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationAwardTrancheTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_97cfaab9-5153-46d9-b3a0-6cd9c22389af" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_e7ecaf03-0884-4d2b-ab0c-17d25c787ceb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_6a46cd4d-da67-4409-88c8-8e8be3ea82d1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationAwardTrancheThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_97cfaab9-5153-46d9-b3a0-6cd9c22389af" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_6a46cd4d-da67-4409-88c8-8e8be3ea82d1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_db803712-e2e9-4743-bc2d-46024df340aa" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1d8be952-c331-4884-a853-7b37ab0a62c5" xlink:to="loc_srt_RangeAxis_db803712-e2e9-4743-bc2d-46024df340aa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_db803712-e2e9-4743-bc2d-46024df340aa_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_db803712-e2e9-4743-bc2d-46024df340aa" xlink:to="loc_srt_RangeMember_db803712-e2e9-4743-bc2d-46024df340aa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_3bab97b5-0fa6-4f12-a909-1e82f32d4bb1" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_db803712-e2e9-4743-bc2d-46024df340aa" xlink:to="loc_srt_RangeMember_3bab97b5-0fa6-4f12-a909-1e82f32d4bb1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_2aec7d86-d3e5-4f72-b146-e8f0ba0c1539" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_3bab97b5-0fa6-4f12-a909-1e82f32d4bb1" xlink:to="loc_srt_MinimumMember_2aec7d86-d3e5-4f72-b146-e8f0ba0c1539" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_650a6c17-923c-4153-a0d1-78d488ec881c" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_3bab97b5-0fa6-4f12-a909-1e82f32d4bb1" xlink:to="loc_srt_MaximumMember_650a6c17-923c-4153-a0d1-78d488ec881c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermOfPlan_7a69797a-7216-45df-86e5-d1938bcd6f58" xlink:href="wynn-20231231.xsd#wynn_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermOfPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cab7b14d-066d-4d83-9d1a-6f2fa9b9eeba" xlink:to="loc_wynn_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermOfPlan_7a69797a-7216-45df-86e5-d1938bcd6f58" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_ef20cd7f-0a8a-4db7-b2b8-5c3ebf6512e1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cab7b14d-066d-4d83-9d1a-6f2fa9b9eeba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_ef20cd7f-0a8a-4db7-b2b8-5c3ebf6512e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_a069a46a-aab1-4bd2-a77b-18697246d957" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cab7b14d-066d-4d83-9d1a-6f2fa9b9eeba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_a069a46a-aab1-4bd2-a77b-18697246d957" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_ebc7bd20-9257-4605-855c-768ea738cf7f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cab7b14d-066d-4d83-9d1a-6f2fa9b9eeba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_ebc7bd20-9257-4605-855c-768ea738cf7f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardMeasurementPeriod_22ba80c2-45eb-49f5-a873-3fe608d2a88e" xlink:href="wynn-20231231.xsd#wynn_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardMeasurementPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cab7b14d-066d-4d83-9d1a-6f2fa9b9eeba" xlink:to="loc_wynn_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardMeasurementPeriod_22ba80c2-45eb-49f5-a873-3fe608d2a88e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_68b77127-d877-46c5-af37-3cf173cf5284" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cab7b14d-066d-4d83-9d1a-6f2fa9b9eeba" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_68b77127-d877-46c5-af37-3cf173cf5284" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_afae5c72-7eda-43aa-9119-97a5c03b2e8d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cab7b14d-066d-4d83-9d1a-6f2fa9b9eeba" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_afae5c72-7eda-43aa-9119-97a5c03b2e8d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumberOfSharesSubjectToServiceAndMarketConditions_919da323-3cd6-4d4c-b48a-4309a013acff" xlink:href="wynn-20231231.xsd#wynn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumberOfSharesSubjectToServiceAndMarketConditions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cab7b14d-066d-4d83-9d1a-6f2fa9b9eeba" xlink:to="loc_wynn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumberOfSharesSubjectToServiceAndMarketConditions_919da323-3cd6-4d4c-b48a-4309a013acff" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_0b491194-e931-46dd-af31-bc36a156e59e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cab7b14d-066d-4d83-9d1a-6f2fa9b9eeba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_0b491194-e931-46dd-af31-bc36a156e59e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_4d95ea09-31f0-4360-9168-d5e8fd2e87ce" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cab7b14d-066d-4d83-9d1a-6f2fa9b9eeba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_4d95ea09-31f0-4360-9168-d5e8fd2e87ce" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_1cf0cf36-5430-4cff-9153-bc0028be7d4a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cab7b14d-066d-4d83-9d1a-6f2fa9b9eeba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_1cf0cf36-5430-4cff-9153-bc0028be7d4a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1_bd3ffa99-5569-42ef-9de5-73761e699b42" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cab7b14d-066d-4d83-9d1a-6f2fa9b9eeba" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1_bd3ffa99-5569-42ef-9de5-73761e699b42" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_7d97c8cb-534c-4137-91dd-f14fddd1a237" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cab7b14d-066d-4d83-9d1a-6f2fa9b9eeba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_7d97c8cb-534c-4137-91dd-f14fddd1a237" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_b913cc0c-d847-4c83-8f19-6428b0bc1ef0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cab7b14d-066d-4d83-9d1a-6f2fa9b9eeba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_b913cc0c-d847-4c83-8f19-6428b0bc1ef0" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_550f1897-714b-41f6-992b-808b2ab4db3b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cab7b14d-066d-4d83-9d1a-6f2fa9b9eeba" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_550f1897-714b-41f6-992b-808b2ab4db3b" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions_dd6cb858-3d95-43a9-b5a3-b28500b94324" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cab7b14d-066d-4d83-9d1a-6f2fa9b9eeba" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions_dd6cb858-3d95-43a9-b5a3-b28500b94324" xlink:type="arc" order="15"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/StockBasedCompensationScheduleofOptionActivityDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#StockBasedCompensationScheduleofOptionActivityDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/StockBasedCompensationScheduleofOptionActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_135464d6-ddb8-4b6f-b1d5-b84389139093" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_a24728fe-131c-40de-b073-0b674feab1eb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_135464d6-ddb8-4b6f-b1d5-b84389139093" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_a24728fe-131c-40de-b073-0b674feab1eb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_bcaba1c7-c9ad-4f77-8176-cdcbe936e04d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_a24728fe-131c-40de-b073-0b674feab1eb" xlink:to="loc_us-gaap_PlanNameAxis_bcaba1c7-c9ad-4f77-8176-cdcbe936e04d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_bcaba1c7-c9ad-4f77-8176-cdcbe936e04d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_bcaba1c7-c9ad-4f77-8176-cdcbe936e04d" xlink:to="loc_us-gaap_PlanNameDomain_bcaba1c7-c9ad-4f77-8176-cdcbe936e04d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_e6524070-f1db-4dd2-9b2d-1b21414e4b84" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_bcaba1c7-c9ad-4f77-8176-cdcbe936e04d" xlink:to="loc_us-gaap_PlanNameDomain_e6524070-f1db-4dd2-9b2d-1b21414e4b84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnResortsLimited2014OmnibusIncentivePlanMember_7c4975ee-a806-4d25-8e22-84df0933ac90" xlink:href="wynn-20231231.xsd#wynn_WynnResortsLimited2014OmnibusIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_e6524070-f1db-4dd2-9b2d-1b21414e4b84" xlink:to="loc_wynn_WynnResortsLimited2014OmnibusIncentivePlanMember_7c4975ee-a806-4d25-8e22-84df0933ac90" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WMLShareOptionPlanMember_27e9f10b-2db7-41fa-8ab8-0aa6f008af4b" xlink:href="wynn-20231231.xsd#wynn_WMLShareOptionPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_e6524070-f1db-4dd2-9b2d-1b21414e4b84" xlink:to="loc_wynn_WMLShareOptionPlanMember_27e9f10b-2db7-41fa-8ab8-0aa6f008af4b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnInteractiveLtd2020OmnibusIncentivePlanMember_ea4a6594-d820-4b1b-a6fc-d416a3d2aa57" xlink:href="wynn-20231231.xsd#wynn_WynnInteractiveLtd2020OmnibusIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_e6524070-f1db-4dd2-9b2d-1b21414e4b84" xlink:to="loc_wynn_WynnInteractiveLtd2020OmnibusIncentivePlanMember_ea4a6594-d820-4b1b-a6fc-d416a3d2aa57" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e3cf03db-d27a-4e1f-806c-b180c302a10d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_135464d6-ddb8-4b6f-b1d5-b84389139093" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e3cf03db-d27a-4e1f-806c-b180c302a10d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_cd6dea5c-0979-4794-8fde-b27ed278f190" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e3cf03db-d27a-4e1f-806c-b180c302a10d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_cd6dea5c-0979-4794-8fde-b27ed278f190" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_764befd9-39b8-4416-827c-aa163141e1f9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e3cf03db-d27a-4e1f-806c-b180c302a10d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_764befd9-39b8-4416-827c-aa163141e1f9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_b4409bf6-4a1e-4bee-aba7-8f1816e6a126" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e3cf03db-d27a-4e1f-806c-b180c302a10d" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_b4409bf6-4a1e-4bee-aba7-8f1816e6a126" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_046c290a-9743-4252-b65c-7981daefddf4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e3cf03db-d27a-4e1f-806c-b180c302a10d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_046c290a-9743-4252-b65c-7981daefddf4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_a880d1ea-4d7b-4983-acaa-bcbde504f755" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_46b454ef-3907-41b3-8b80-67f725fabce3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e3cf03db-d27a-4e1f-806c-b180c302a10d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_46b454ef-3907-41b3-8b80-67f725fabce3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber_cda7f93f-109a-447a-a751-567eeb64129d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e3cf03db-d27a-4e1f-806c-b180c302a10d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber_cda7f93f-109a-447a-a751-567eeb64129d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_110c037e-9b95-416e-b235-3c9ac2c87e45" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_135464d6-ddb8-4b6f-b1d5-b84389139093" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_110c037e-9b95-416e-b235-3c9ac2c87e45" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_2762deff-c6ae-4ad6-a297-537c15bd6916" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_110c037e-9b95-416e-b235-3c9ac2c87e45" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_2762deff-c6ae-4ad6-a297-537c15bd6916" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_6c29f3a6-6496-4ae4-a138-f92002378196" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_110c037e-9b95-416e-b235-3c9ac2c87e45" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_6c29f3a6-6496-4ae4-a138-f92002378196" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_cd2a93e5-2e4c-43cf-9850-ef3cd60f59f0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_110c037e-9b95-416e-b235-3c9ac2c87e45" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_cd2a93e5-2e4c-43cf-9850-ef3cd60f59f0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_50193eec-25cf-48f2-9374-eb5c26aef1f9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_110c037e-9b95-416e-b235-3c9ac2c87e45" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_50193eec-25cf-48f2-9374-eb5c26aef1f9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_6c0b610a-e2f2-46bc-a01e-980ab7233b93" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_71031119-847f-4905-a0d5-dc850e18c9e4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_110c037e-9b95-416e-b235-3c9ac2c87e45" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_71031119-847f-4905-a0d5-dc850e18c9e4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_1872a7ae-c619-468d-b5ee-810d4d3b06d9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_110c037e-9b95-416e-b235-3c9ac2c87e45" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_1872a7ae-c619-468d-b5ee-810d4d3b06d9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract_28024b58-793b-4d99-b6e5-8538ff0cf28b" xlink:href="wynn-20231231.xsd#wynn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_135464d6-ddb8-4b6f-b1d5-b84389139093" xlink:to="loc_wynn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract_28024b58-793b-4d99-b6e5-8538ff0cf28b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_191dcb8b-5bd5-4a72-b6d0-8768835cf49a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract_28024b58-793b-4d99-b6e5-8538ff0cf28b" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_191dcb8b-5bd5-4a72-b6d0-8768835cf49a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1_28b8fe15-a948-4bff-b493-299a270c7c3e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract_28024b58-793b-4d99-b6e5-8538ff0cf28b" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1_28b8fe15-a948-4bff-b493-299a270c7c3e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_eeda2ced-0fc9-44ff-86f1-fb27598b212e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract_28024b58-793b-4d99-b6e5-8538ff0cf28b" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_eeda2ced-0fc9-44ff-86f1-fb27598b212e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAggregateIntrinsicValueAbstract_e6db0bc2-bf81-4aa7-84b7-0db2aa092f0f" xlink:href="wynn-20231231.xsd#wynn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAggregateIntrinsicValueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_135464d6-ddb8-4b6f-b1d5-b84389139093" xlink:to="loc_wynn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAggregateIntrinsicValueAbstract_e6db0bc2-bf81-4aa7-84b7-0db2aa092f0f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_33f71a02-f247-47f5-8baf-f3dc0fe4f287" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAggregateIntrinsicValueAbstract_e6db0bc2-bf81-4aa7-84b7-0db2aa092f0f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_33f71a02-f247-47f5-8baf-f3dc0fe4f287" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_0d056588-ab4c-449f-b74a-3ede2be661b0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAggregateIntrinsicValueAbstract_e6db0bc2-bf81-4aa7-84b7-0db2aa092f0f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_0d056588-ab4c-449f-b74a-3ede2be661b0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_f7e87fa9-ab12-43e8-9e50-eeb6637edf62" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAggregateIntrinsicValueAbstract_e6db0bc2-bf81-4aa7-84b7-0db2aa092f0f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_f7e87fa9-ab12-43e8-9e50-eeb6637edf62" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_4bd20b5e-56bd-45ec-a6c2-a915bade2376" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_135464d6-ddb8-4b6f-b1d5-b84389139093" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_4bd20b5e-56bd-45ec-a6c2-a915bade2376" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_b820955d-4d51-4e75-9519-8dea56164a72" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_4bd20b5e-56bd-45ec-a6c2-a915bade2376" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_b820955d-4d51-4e75-9519-8dea56164a72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_72311d3e-2ef4-4d36-81fc-16b402cc245d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_4bd20b5e-56bd-45ec-a6c2-a915bade2376" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_72311d3e-2ef4-4d36-81fc-16b402cc245d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_46818597-08b7-4cb3-adaa-892455ef6b8b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_4bd20b5e-56bd-45ec-a6c2-a915bade2376" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_46818597-08b7-4cb3-adaa-892455ef6b8b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_982dbb10-e57d-4303-8997-33041656af33" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_4bd20b5e-56bd-45ec-a6c2-a915bade2376" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_982dbb10-e57d-4303-8997-33041656af33" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_bff6ac8b-410a-47cf-bbdd-9112ffdc2593" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_4bd20b5e-56bd-45ec-a6c2-a915bade2376" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_bff6ac8b-410a-47cf-bbdd-9112ffdc2593" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/StockBasedCompensationScheduleofValuationAssumptionsDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#StockBasedCompensationScheduleofValuationAssumptionsDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/StockBasedCompensationScheduleofValuationAssumptionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c029d3c7-e12b-486f-9953-93d33ef3982e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_826c8fb4-7829-40a6-905b-eb2dccc931d7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c029d3c7-e12b-486f-9953-93d33ef3982e" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_826c8fb4-7829-40a6-905b-eb2dccc931d7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_bacb1749-daee-495d-980e-4bb7bde70c54" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_826c8fb4-7829-40a6-905b-eb2dccc931d7" xlink:to="loc_us-gaap_PlanNameAxis_bacb1749-daee-495d-980e-4bb7bde70c54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_bacb1749-daee-495d-980e-4bb7bde70c54_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_bacb1749-daee-495d-980e-4bb7bde70c54" xlink:to="loc_us-gaap_PlanNameDomain_bacb1749-daee-495d-980e-4bb7bde70c54_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_8fcb6668-bf1d-4455-ba75-128fda0a8d2f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_bacb1749-daee-495d-980e-4bb7bde70c54" xlink:to="loc_us-gaap_PlanNameDomain_8fcb6668-bf1d-4455-ba75-128fda0a8d2f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnResortsLimited2014OmnibusIncentivePlanMember_e5754a53-08b1-45a4-9fff-0a9193f645ba" xlink:href="wynn-20231231.xsd#wynn_WynnResortsLimited2014OmnibusIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_8fcb6668-bf1d-4455-ba75-128fda0a8d2f" xlink:to="loc_wynn_WynnResortsLimited2014OmnibusIncentivePlanMember_e5754a53-08b1-45a4-9fff-0a9193f645ba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WMLShareOptionPlanMember_44f3647c-e36d-41a8-907a-2b629752724d" xlink:href="wynn-20231231.xsd#wynn_WMLShareOptionPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_8fcb6668-bf1d-4455-ba75-128fda0a8d2f" xlink:to="loc_wynn_WMLShareOptionPlanMember_44f3647c-e36d-41a8-907a-2b629752724d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnInteractiveLtd2020OmnibusIncentivePlanMember_774f4e35-0bf2-490c-b68f-276e5ec1e7c9" xlink:href="wynn-20231231.xsd#wynn_WynnInteractiveLtd2020OmnibusIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_8fcb6668-bf1d-4455-ba75-128fda0a8d2f" xlink:to="loc_wynn_WynnInteractiveLtd2020OmnibusIncentivePlanMember_774f4e35-0bf2-490c-b68f-276e5ec1e7c9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_414cfa86-7edb-4d18-a788-a1ad6796736c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_826c8fb4-7829-40a6-905b-eb2dccc931d7" xlink:to="loc_us-gaap_AwardTypeAxis_414cfa86-7edb-4d18-a788-a1ad6796736c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_414cfa86-7edb-4d18-a788-a1ad6796736c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_414cfa86-7edb-4d18-a788-a1ad6796736c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_414cfa86-7edb-4d18-a788-a1ad6796736c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cbbefbc6-c1b2-4081-b4a2-8885f710248f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_414cfa86-7edb-4d18-a788-a1ad6796736c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cbbefbc6-c1b2-4081-b4a2-8885f710248f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_9909611d-ade8-4b7b-814b-1de773f3e335" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cbbefbc6-c1b2-4081-b4a2-8885f710248f" xlink:to="loc_us-gaap_PerformanceSharesMember_9909611d-ade8-4b7b-814b-1de773f3e335" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_dfae010d-3c80-4c39-b3bd-0191bbad856c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c029d3c7-e12b-486f-9953-93d33ef3982e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_dfae010d-3c80-4c39-b3bd-0191bbad856c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_52f2f57c-8378-40d9-b0c8-8a20c0aad7ce" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c029d3c7-e12b-486f-9953-93d33ef3982e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_52f2f57c-8378-40d9-b0c8-8a20c0aad7ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_e4c2ce4d-8443-4ced-a385-1ec2ab07bb44" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c029d3c7-e12b-486f-9953-93d33ef3982e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_e4c2ce4d-8443-4ced-a385-1ec2ab07bb44" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_94c1793c-dcad-4ee2-ab95-dc94c2b0eeb5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c029d3c7-e12b-486f-9953-93d33ef3982e" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_94c1793c-dcad-4ee2-ab95-dc94c2b0eeb5" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/StockBasedCompensationScheduleofNonvestedActivityDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#StockBasedCompensationScheduleofNonvestedActivityDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/StockBasedCompensationScheduleofNonvestedActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ad84e4d7-7408-4992-8cf0-5a425be5e32c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b20f0417-143e-43c9-b5e9-3796e694a568" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ad84e4d7-7408-4992-8cf0-5a425be5e32c" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b20f0417-143e-43c9-b5e9-3796e694a568" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_7200f758-3618-4c60-ac21-d3ca0e0a31f5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b20f0417-143e-43c9-b5e9-3796e694a568" xlink:to="loc_us-gaap_PlanNameAxis_7200f758-3618-4c60-ac21-d3ca0e0a31f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_7200f758-3618-4c60-ac21-d3ca0e0a31f5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_7200f758-3618-4c60-ac21-d3ca0e0a31f5" xlink:to="loc_us-gaap_PlanNameDomain_7200f758-3618-4c60-ac21-d3ca0e0a31f5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_e85fee40-d57e-4626-9dc5-2bdba8858424" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_7200f758-3618-4c60-ac21-d3ca0e0a31f5" xlink:to="loc_us-gaap_PlanNameDomain_e85fee40-d57e-4626-9dc5-2bdba8858424" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnResortsLimited2014OmnibusIncentivePlanMember_aaad7db5-1c0e-464a-87bb-d82a8e99d3a5" xlink:href="wynn-20231231.xsd#wynn_WynnResortsLimited2014OmnibusIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_e85fee40-d57e-4626-9dc5-2bdba8858424" xlink:to="loc_wynn_WynnResortsLimited2014OmnibusIncentivePlanMember_aaad7db5-1c0e-464a-87bb-d82a8e99d3a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WMLShareAwardPlanMember_8f74d2a9-6277-490c-94d6-d979276730ac" xlink:href="wynn-20231231.xsd#wynn_WMLShareAwardPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_e85fee40-d57e-4626-9dc5-2bdba8858424" xlink:to="loc_wynn_WMLShareAwardPlanMember_8f74d2a9-6277-490c-94d6-d979276730ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WILOmnibusPlanMember_92fb26fe-b778-48ab-b127-943169091e69" xlink:href="wynn-20231231.xsd#wynn_WILOmnibusPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_e85fee40-d57e-4626-9dc5-2bdba8858424" xlink:to="loc_wynn_WILOmnibusPlanMember_92fb26fe-b778-48ab-b127-943169091e69" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_4e1265e3-8f4d-41af-83f2-d1a89133dae2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b20f0417-143e-43c9-b5e9-3796e694a568" xlink:to="loc_us-gaap_AwardTypeAxis_4e1265e3-8f4d-41af-83f2-d1a89133dae2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4e1265e3-8f4d-41af-83f2-d1a89133dae2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_4e1265e3-8f4d-41af-83f2-d1a89133dae2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4e1265e3-8f4d-41af-83f2-d1a89133dae2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ff101485-e1af-409f-9466-0ff381fc09a9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_4e1265e3-8f4d-41af-83f2-d1a89133dae2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ff101485-e1af-409f-9466-0ff381fc09a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_1a0d668a-7b12-49b3-b020-f97677164681" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ff101485-e1af-409f-9466-0ff381fc09a9" xlink:to="loc_us-gaap_PerformanceSharesMember_1a0d668a-7b12-49b3-b020-f97677164681" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2e070600-6e77-41cc-99a5-6782ad065151" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ad84e4d7-7408-4992-8cf0-5a425be5e32c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2e070600-6e77-41cc-99a5-6782ad065151" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_25bc64d6-14d2-4e10-9402-c6b3b06e8f57" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2e070600-6e77-41cc-99a5-6782ad065151" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_25bc64d6-14d2-4e10-9402-c6b3b06e8f57" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_9ff3db80-9dbe-4b19-8fe5-e9b280544d32" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2e070600-6e77-41cc-99a5-6782ad065151" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_9ff3db80-9dbe-4b19-8fe5-e9b280544d32" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_0966c4e1-7818-494e-ade4-5c4070441ce7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2e070600-6e77-41cc-99a5-6782ad065151" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_0966c4e1-7818-494e-ade4-5c4070441ce7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_4d487190-c322-448b-a788-5fa0cfc120a6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2e070600-6e77-41cc-99a5-6782ad065151" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_4d487190-c322-448b-a788-5fa0cfc120a6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_172ba1fb-0e9b-481e-8e0a-8c3f5c496f15" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_06d4b140-67a8-4ee4-8cbf-c382f4626892" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ad84e4d7-7408-4992-8cf0-5a425be5e32c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_06d4b140-67a8-4ee4-8cbf-c382f4626892" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_a30cd526-b02d-4edf-81b4-e8aa66f1a5ac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_06d4b140-67a8-4ee4-8cbf-c382f4626892" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_a30cd526-b02d-4edf-81b4-e8aa66f1a5ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_50b2496e-7c69-4cea-9846-080df014a2f0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_06d4b140-67a8-4ee4-8cbf-c382f4626892" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_50b2496e-7c69-4cea-9846-080df014a2f0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_632ebc8f-b1b2-4526-a593-bef81da4a72f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_06d4b140-67a8-4ee4-8cbf-c382f4626892" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_632ebc8f-b1b2-4526-a593-bef81da4a72f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_f81b4018-4b9a-4ade-8d49-372bd76fd04c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_06d4b140-67a8-4ee4-8cbf-c382f4626892" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_f81b4018-4b9a-4ade-8d49-372bd76fd04c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_7f80f6ac-3c86-42db-9e1b-9991116d5d8a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_5766bb07-c1fe-4d21-b03a-f29a048482fe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_eb403c5d-5854-4cb9-808c-1fbe77118973" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ad84e4d7-7408-4992-8cf0-5a425be5e32c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_eb403c5d-5854-4cb9-808c-1fbe77118973" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/StockBasedCompensationScheduleofAllocatedCostsDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#StockBasedCompensationScheduleofAllocatedCostsDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/StockBasedCompensationScheduleofAllocatedCostsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_fb951fc8-b9c8-4559-b625-9033540da19c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_a26623e9-d514-4023-929f-846e3ecb256b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_fb951fc8-b9c8-4559-b625-9033540da19c" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_a26623e9-d514-4023-929f-846e3ecb256b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_243a2377-80ec-482f-9092-9ea7d07c32f9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_a26623e9-d514-4023-929f-846e3ecb256b" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_243a2377-80ec-482f-9092-9ea7d07c32f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_243a2377-80ec-482f-9092-9ea7d07c32f9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_243a2377-80ec-482f-9092-9ea7d07c32f9" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_243a2377-80ec-482f-9092-9ea7d07c32f9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_3cf88ae3-eea7-40b9-95c0-4ebd1deb4bfd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_243a2377-80ec-482f-9092-9ea7d07c32f9" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_3cf88ae3-eea7-40b9-95c0-4ebd1deb4bfd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CasinoMember_c0f78f47-5a8f-4628-9dd4-eb238f0f74a8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CasinoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3cf88ae3-eea7-40b9-95c0-4ebd1deb4bfd" xlink:to="loc_us-gaap_CasinoMember_c0f78f47-5a8f-4628-9dd4-eb238f0f74a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_RoomsMember_849048bb-91e8-471a-9164-e854a12a7ebf" xlink:href="wynn-20231231.xsd#wynn_RoomsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3cf88ae3-eea7-40b9-95c0-4ebd1deb4bfd" xlink:to="loc_wynn_RoomsMember_849048bb-91e8-471a-9164-e854a12a7ebf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FoodAndBeverageMember_09210966-3eef-40b7-8ac9-abe134de1e6e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FoodAndBeverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3cf88ae3-eea7-40b9-95c0-4ebd1deb4bfd" xlink:to="loc_us-gaap_FoodAndBeverageMember_09210966-3eef-40b7-8ac9-abe134de1e6e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_EntertainmentRetailAndOtherMember_399d9fcc-a698-4fbb-8c23-82294026f95f" xlink:href="wynn-20231231.xsd#wynn_EntertainmentRetailAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3cf88ae3-eea7-40b9-95c0-4ebd1deb4bfd" xlink:to="loc_wynn_EntertainmentRetailAndOtherMember_399d9fcc-a698-4fbb-8c23-82294026f95f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_082e8d96-2e5f-4ac7-9160-9de9dbc09317" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GeneralAndAdministrativeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3cf88ae3-eea7-40b9-95c0-4ebd1deb4bfd" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_082e8d96-2e5f-4ac7-9160-9de9dbc09317" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_c0063fcd-63c1-415d-ba48-6bdbd50af45a" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_a26623e9-d514-4023-929f-846e3ecb256b" xlink:to="loc_srt_ProductOrServiceAxis_c0063fcd-63c1-415d-ba48-6bdbd50af45a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_c0063fcd-63c1-415d-ba48-6bdbd50af45a_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_c0063fcd-63c1-415d-ba48-6bdbd50af45a" xlink:to="loc_srt_ProductsAndServicesDomain_c0063fcd-63c1-415d-ba48-6bdbd50af45a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_031ceb85-c85f-4796-a25e-ec3169ba2428" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_c0063fcd-63c1-415d-ba48-6bdbd50af45a" xlink:to="loc_srt_ProductsAndServicesDomain_031ceb85-c85f-4796-a25e-ec3169ba2428" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_EntertainmentRetailAndOtherMember_360e883c-6d7d-4ab9-8a46-3d4f393d8fe2" xlink:href="wynn-20231231.xsd#wynn_EntertainmentRetailAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_031ceb85-c85f-4796-a25e-ec3169ba2428" xlink:to="loc_wynn_EntertainmentRetailAndOtherMember_360e883c-6d7d-4ab9-8a46-3d4f393d8fe2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_72f6570c-c22b-48ad-888a-f9391432a72f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_a26623e9-d514-4023-929f-846e3ecb256b" xlink:to="loc_us-gaap_AwardTypeAxis_72f6570c-c22b-48ad-888a-f9391432a72f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_72f6570c-c22b-48ad-888a-f9391432a72f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_72f6570c-c22b-48ad-888a-f9391432a72f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_72f6570c-c22b-48ad-888a-f9391432a72f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_767395a9-55f4-4973-9553-5ac93762434b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_72f6570c-c22b-48ad-888a-f9391432a72f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_767395a9-55f4-4973-9553-5ac93762434b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_6bb7f3cd-3c48-4a2d-9109-fbf9bcf2d9f8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_767395a9-55f4-4973-9553-5ac93762434b" xlink:to="loc_us-gaap_PerformanceSharesMember_6bb7f3cd-3c48-4a2d-9109-fbf9bcf2d9f8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_7d9b5c87-93b7-4de4-8a58-31b69f3049c3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_fb951fc8-b9c8-4559-b625-9033540da19c" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_7d9b5c87-93b7-4de4-8a58-31b69f3049c3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount_b2463de9-2895-4351-bf75-928bb58ac0e5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_fb951fc8-b9c8-4559-b625-9033540da19c" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount_b2463de9-2895-4351-bf75-928bb58ac0e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1_3a1c1bd1-702a-416c-8ea9-39b54e419269" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_fb951fc8-b9c8-4559-b625-9033540da19c" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1_3a1c1bd1-702a-416c-8ea9-39b54e419269" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/IncomeTaxesAdditionalInformationDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#IncomeTaxesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/IncomeTaxesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_wynn_IncomeTaxesLineItems_9165335d-6ad0-406a-b34c-5301635dab05" xlink:href="wynn-20231231.xsd#wynn_IncomeTaxesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_IncomeTaxesTable_94aaa57b-392e-44f0-b1b6-3c17df4cc6d6" xlink:href="wynn-20231231.xsd#wynn_IncomeTaxesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_wynn_IncomeTaxesLineItems_9165335d-6ad0-406a-b34c-5301635dab05" xlink:to="loc_wynn_IncomeTaxesTable_94aaa57b-392e-44f0-b1b6-3c17df4cc6d6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_6e6fdcff-8e72-47fd-bda0-cfa57756d2de" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_IncomeTaxesTable_94aaa57b-392e-44f0-b1b6-3c17df4cc6d6" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_6e6fdcff-8e72-47fd-bda0-cfa57756d2de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_6e6fdcff-8e72-47fd-bda0-cfa57756d2de_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_6e6fdcff-8e72-47fd-bda0-cfa57756d2de" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_6e6fdcff-8e72-47fd-bda0-cfa57756d2de_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_4e172db5-9424-41db-bc1e-799c5c7a5887" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_6e6fdcff-8e72-47fd-bda0-cfa57756d2de" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_4e172db5-9424-41db-bc1e-799c5c7a5887" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticCountryMember_bba16f2d-64e5-433e-9d16-dfa9337a58b3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DomesticCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_4e172db5-9424-41db-bc1e-799c5c7a5887" xlink:to="loc_us-gaap_DomesticCountryMember_bba16f2d-64e5-433e-9d16-dfa9337a58b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCountryMember_30bc379d-e3ac-4ec3-81a4-340a0e4bf9b6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ForeignCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_4e172db5-9424-41db-bc1e-799c5c7a5887" xlink:to="loc_us-gaap_ForeignCountryMember_30bc379d-e3ac-4ec3-81a4-340a0e4bf9b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardAxis_45e6c023-1159-4e3b-a417-eb2783ab28cc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TaxCreditCarryforwardAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_IncomeTaxesTable_94aaa57b-392e-44f0-b1b6-3c17df4cc6d6" xlink:to="loc_us-gaap_TaxCreditCarryforwardAxis_45e6c023-1159-4e3b-a417-eb2783ab28cc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardNameDomain_45e6c023-1159-4e3b-a417-eb2783ab28cc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TaxCreditCarryforwardNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TaxCreditCarryforwardAxis_45e6c023-1159-4e3b-a417-eb2783ab28cc" xlink:to="loc_us-gaap_TaxCreditCarryforwardNameDomain_45e6c023-1159-4e3b-a417-eb2783ab28cc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardNameDomain_28d91283-bc73-409a-9fe5-bfc1b15118a7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TaxCreditCarryforwardNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TaxCreditCarryforwardAxis_45e6c023-1159-4e3b-a417-eb2783ab28cc" xlink:to="loc_us-gaap_TaxCreditCarryforwardNameDomain_28d91283-bc73-409a-9fe5-bfc1b15118a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnResortsMacauMember_e7e7c7b9-9ddf-42c5-a35d-1913995731dc" xlink:href="wynn-20231231.xsd#wynn_WynnResortsMacauMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardNameDomain_28d91283-bc73-409a-9fe5-bfc1b15118a7" xlink:to="loc_wynn_WynnResortsMacauMember_e7e7c7b9-9ddf-42c5-a35d-1913995731dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_RecognizedTaxBenefitAxis_8249b12a-1e9e-4026-8426-b5bc91bda9ce" xlink:href="wynn-20231231.xsd#wynn_RecognizedTaxBenefitAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_IncomeTaxesTable_94aaa57b-392e-44f0-b1b6-3c17df4cc6d6" xlink:to="loc_wynn_RecognizedTaxBenefitAxis_8249b12a-1e9e-4026-8426-b5bc91bda9ce" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_RecognizedTaxBenefitDomain_8249b12a-1e9e-4026-8426-b5bc91bda9ce_default" xlink:href="wynn-20231231.xsd#wynn_RecognizedTaxBenefitDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_wynn_RecognizedTaxBenefitAxis_8249b12a-1e9e-4026-8426-b5bc91bda9ce" xlink:to="loc_wynn_RecognizedTaxBenefitDomain_8249b12a-1e9e-4026-8426-b5bc91bda9ce_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_RecognizedTaxBenefitDomain_9c4ec818-5dc6-4817-beb0-7744ddc2c533" xlink:href="wynn-20231231.xsd#wynn_RecognizedTaxBenefitDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_wynn_RecognizedTaxBenefitAxis_8249b12a-1e9e-4026-8426-b5bc91bda9ce" xlink:to="loc_wynn_RecognizedTaxBenefitDomain_9c4ec818-5dc6-4817-beb0-7744ddc2c533" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_TaxCreditCarryforwardExpires2024Member_2b1ef7cd-a009-4fc3-a0ff-600a5577fe3f" xlink:href="wynn-20231231.xsd#wynn_TaxCreditCarryforwardExpires2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_RecognizedTaxBenefitDomain_9c4ec818-5dc6-4817-beb0-7744ddc2c533" xlink:to="loc_wynn_TaxCreditCarryforwardExpires2024Member_2b1ef7cd-a009-4fc3-a0ff-600a5577fe3f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_TaxCreditCarryforwardExpires2025Member_3c699bc5-7a96-4c8d-b4eb-70349e7c44f6" xlink:href="wynn-20231231.xsd#wynn_TaxCreditCarryforwardExpires2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_RecognizedTaxBenefitDomain_9c4ec818-5dc6-4817-beb0-7744ddc2c533" xlink:to="loc_wynn_TaxCreditCarryforwardExpires2025Member_3c699bc5-7a96-4c8d-b4eb-70349e7c44f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_TaxCreditCarryforwardExpires2027Member_f61080c2-aef9-42f9-adf1-23378263ad4b" xlink:href="wynn-20231231.xsd#wynn_TaxCreditCarryforwardExpires2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_RecognizedTaxBenefitDomain_9c4ec818-5dc6-4817-beb0-7744ddc2c533" xlink:to="loc_wynn_TaxCreditCarryforwardExpires2027Member_f61080c2-aef9-42f9-adf1-23378263ad4b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_81481a9a-7dff-4ef5-acc4-2f428e17f247" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_IncomeTaxesTable_94aaa57b-392e-44f0-b1b6-3c17df4cc6d6" xlink:to="loc_srt_RangeAxis_81481a9a-7dff-4ef5-acc4-2f428e17f247" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_81481a9a-7dff-4ef5-acc4-2f428e17f247_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_81481a9a-7dff-4ef5-acc4-2f428e17f247" xlink:to="loc_srt_RangeMember_81481a9a-7dff-4ef5-acc4-2f428e17f247_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_a7d10755-7591-41a6-a157-cac5716da0f9" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_81481a9a-7dff-4ef5-acc4-2f428e17f247" xlink:to="loc_srt_RangeMember_a7d10755-7591-41a6-a157-cac5716da0f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_3db8ffe0-9dcc-41a9-9706-5252931fabb1" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_a7d10755-7591-41a6-a157-cac5716da0f9" xlink:to="loc_srt_MaximumMember_3db8ffe0-9dcc-41a9-9706-5252931fabb1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_220a9c55-8ffb-429e-9dbb-9bec64547288" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowanceByDeferredTaxAssetAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_IncomeTaxesTable_94aaa57b-392e-44f0-b1b6-3c17df4cc6d6" xlink:to="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_220a9c55-8ffb-429e-9dbb-9bec64547288" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetDomain_220a9c55-8ffb-429e-9dbb-9bec64547288_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_220a9c55-8ffb-429e-9dbb-9bec64547288" xlink:to="loc_us-gaap_DeferredTaxAssetDomain_220a9c55-8ffb-429e-9dbb-9bec64547288_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetDomain_b851a8cf-e04e-4066-b46c-30fc0f0f3190" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_220a9c55-8ffb-429e-9dbb-9bec64547288" xlink:to="loc_us-gaap_DeferredTaxAssetDomain_b851a8cf-e04e-4066-b46c-30fc0f0f3190" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FTCCarryforwardMember_c23915ec-137e-49dd-b614-35c3159e5086" xlink:href="wynn-20231231.xsd#wynn_FTCCarryforwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetDomain_b851a8cf-e04e-4066-b46c-30fc0f0f3190" xlink:to="loc_wynn_FTCCarryforwardMember_c23915ec-137e-49dd-b614-35c3159e5086" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FTCCarryforwardCurrentYearUtilizationMember_40296d68-b1c5-482d-863e-92d6c1cbee13" xlink:href="wynn-20231231.xsd#wynn_FTCCarryforwardCurrentYearUtilizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_FTCCarryforwardMember_c23915ec-137e-49dd-b614-35c3159e5086" xlink:to="loc_wynn_FTCCarryforwardCurrentYearUtilizationMember_40296d68-b1c5-482d-863e-92d6c1cbee13" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FTCCarryforwardExpirationsDuringYearMember_61e29b6f-280b-4363-9225-2d59d7bb9bf2" xlink:href="wynn-20231231.xsd#wynn_FTCCarryforwardExpirationsDuringYearMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_FTCCarryforwardMember_c23915ec-137e-49dd-b614-35c3159e5086" xlink:to="loc_wynn_FTCCarryforwardExpirationsDuringYearMember_61e29b6f-280b-4363-9225-2d59d7bb9bf2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FTCCarryforwardMoreThanLikelyNotRealizedMember_1d67469e-798a-4563-b97a-1a1c9eadbe83" xlink:href="wynn-20231231.xsd#wynn_FTCCarryforwardMoreThanLikelyNotRealizedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_FTCCarryforwardMember_c23915ec-137e-49dd-b614-35c3159e5086" xlink:to="loc_wynn_FTCCarryforwardMoreThanLikelyNotRealizedMember_1d67469e-798a-4563-b97a-1a1c9eadbe83" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DisallowedInterestExpenseCarryforwardsMember_0954837d-3b06-4374-84bb-83ccba58c29d" xlink:href="wynn-20231231.xsd#wynn_DisallowedInterestExpenseCarryforwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetDomain_b851a8cf-e04e-4066-b46c-30fc0f0f3190" xlink:to="loc_wynn_DisallowedInterestExpenseCarryforwardsMember_0954837d-3b06-4374-84bb-83ccba58c29d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_ComplementaryTaxRate_28c16b41-3462-40ba-a2ad-b1c954e52f81" xlink:href="wynn-20231231.xsd#wynn_ComplementaryTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_IncomeTaxesLineItems_9165335d-6ad0-406a-b34c-5301635dab05" xlink:to="loc_wynn_ComplementaryTaxRate_28c16b41-3462-40ba-a2ad-b1c954e52f81" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_AmountOfComplementaryTaxExemption_c53bdffe-4223-4d10-aba7-b2af90cbca45" xlink:href="wynn-20231231.xsd#wynn_AmountOfComplementaryTaxExemption"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_IncomeTaxesLineItems_9165335d-6ad0-406a-b34c-5301635dab05" xlink:to="loc_wynn_AmountOfComplementaryTaxExemption_c53bdffe-4223-4d10-aba7-b2af90cbca45" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_AmountOfComplementaryTaxExemptionPerShare_da1ef752-ed1a-4dac-b1e9-4b80ee633137" xlink:href="wynn-20231231.xsd#wynn_AmountOfComplementaryTaxExemptionPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_IncomeTaxesLineItems_9165335d-6ad0-406a-b34c-5301635dab05" xlink:to="loc_wynn_AmountOfComplementaryTaxExemptionPerShare_da1ef752-ed1a-4dac-b1e9-4b80ee633137" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_PaymentsForAnnualComplementaryTaxObligation_b63e1491-7bee-4b78-83a6-8256d98bfbfc" xlink:href="wynn-20231231.xsd#wynn_PaymentsForAnnualComplementaryTaxObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_IncomeTaxesLineItems_9165335d-6ad0-406a-b34c-5301635dab05" xlink:to="loc_wynn_PaymentsForAnnualComplementaryTaxObligation_b63e1491-7bee-4b78-83a6-8256d98bfbfc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_95a6ef6e-0eb4-42e9-932c-1ad2dca2519b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_IncomeTaxesLineItems_9165335d-6ad0-406a-b34c-5301635dab05" xlink:to="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_95a6ef6e-0eb4-42e9-932c-1ad2dca2519b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_TaxBenefitsFromExerciseOfNonqualifiedStockOptionsVestedRestrictedStockAndAccruedDividends_0e41801b-da38-42f8-adcf-0d766d96e2c4" xlink:href="wynn-20231231.xsd#wynn_TaxBenefitsFromExerciseOfNonqualifiedStockOptionsVestedRestrictedStockAndAccruedDividends"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_IncomeTaxesLineItems_9165335d-6ad0-406a-b34c-5301635dab05" xlink:to="loc_wynn_TaxBenefitsFromExerciseOfNonqualifiedStockOptionsVestedRestrictedStockAndAccruedDividends_0e41801b-da38-42f8-adcf-0d766d96e2c4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign_9f46cfba-6729-4220-a7f6-a4db86c4cbaf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_IncomeTaxesLineItems_9165335d-6ad0-406a-b34c-5301635dab05" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign_9f46cfba-6729-4220-a7f6-a4db86c4cbaf" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DeferredTaxAssetDisallowedInterestExpenseCarryforwardsNotSubjecttoExpiration_29a0412a-a08d-44e9-be79-dc0853f83964" xlink:href="wynn-20231231.xsd#wynn_DeferredTaxAssetDisallowedInterestExpenseCarryforwardsNotSubjecttoExpiration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_IncomeTaxesLineItems_9165335d-6ad0-406a-b34c-5301635dab05" xlink:to="loc_wynn_DeferredTaxAssetDisallowedInterestExpenseCarryforwardsNotSubjecttoExpiration_29a0412a-a08d-44e9-be79-dc0853f83964" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwards_a0f96d43-48b6-4bed-9d33-40440b8b8c40" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLossCarryforwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_IncomeTaxesLineItems_9165335d-6ad0-406a-b34c-5301635dab05" xlink:to="loc_us-gaap_OperatingLossCarryforwards_a0f96d43-48b6-4bed-9d33-40440b8b8c40" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_UsAndForeignUncertainTaxPositionsThatIncreaseNolAndForeignTaxCreditCarryforwardDeferredTaxAssets_69589063-eb17-449d-b4f7-028fcc8069a3" xlink:href="wynn-20231231.xsd#wynn_UsAndForeignUncertainTaxPositionsThatIncreaseNolAndForeignTaxCreditCarryforwardDeferredTaxAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_IncomeTaxesLineItems_9165335d-6ad0-406a-b34c-5301635dab05" xlink:to="loc_wynn_UsAndForeignUncertainTaxPositionsThatIncreaseNolAndForeignTaxCreditCarryforwardDeferredTaxAssets_69589063-eb17-449d-b4f7-028fcc8069a3" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForUncertainTaxPositionsNoncurrent_627e6a51-85e6-46b5-ae1d-fe06b86c288b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilityForUncertainTaxPositionsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_IncomeTaxesLineItems_9165335d-6ad0-406a-b34c-5301635dab05" xlink:to="loc_us-gaap_LiabilityForUncertainTaxPositionsNoncurrent_627e6a51-85e6-46b5-ae1d-fe06b86c288b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_80cea630-2554-4921-938b-e990c677269c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_IncomeTaxesLineItems_9165335d-6ad0-406a-b34c-5301635dab05" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_80cea630-2554-4921-938b-e990c677269c" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense_8a721293-63f8-4983-be07-3e54501a2201" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_IncomeTaxesLineItems_9165335d-6ad0-406a-b34c-5301635dab05" xlink:to="loc_us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense_8a721293-63f8-4983-be07-3e54501a2201" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit_dee43092-9ff7-4ec1-94e9-e6c4414d5548" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_IncomeTaxesLineItems_9165335d-6ad0-406a-b34c-5301635dab05" xlink:to="loc_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit_dee43092-9ff7-4ec1-94e9-e6c4414d5548" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations_50c001db-9490-46ee-9fb7-0a1d070734fe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_IncomeTaxesLineItems_9165335d-6ad0-406a-b34c-5301635dab05" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations_50c001db-9490-46ee-9fb7-0a1d070734fe" xlink:type="arc" order="14"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/IncomeTaxesSummaryofNetDeferredTaxAssetsandLiabilitiesDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#IncomeTaxesSummaryofNetDeferredTaxAssetsandLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/IncomeTaxesSummaryofNetDeferredTaxAssetsandLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DeferredTaxAssetsAndLiabilitiesLineItems_9019d6cf-a4ae-4d96-ba18-c2dfd3ee02a0" xlink:href="wynn-20231231.xsd#wynn_DeferredTaxAssetsAndLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DeferredTaxAssetsAndLiabilitiesTable_ebbbc31e-1d65-489a-b210-99622e011f1c" xlink:href="wynn-20231231.xsd#wynn_DeferredTaxAssetsAndLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_wynn_DeferredTaxAssetsAndLiabilitiesLineItems_9019d6cf-a4ae-4d96-ba18-c2dfd3ee02a0" xlink:to="loc_wynn_DeferredTaxAssetsAndLiabilitiesTable_ebbbc31e-1d65-489a-b210-99622e011f1c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_42750e00-c887-43dc-bb66-6aeb96e06c48" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_DeferredTaxAssetsAndLiabilitiesTable_ebbbc31e-1d65-489a-b210-99622e011f1c" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_42750e00-c887-43dc-bb66-6aeb96e06c48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_42750e00-c887-43dc-bb66-6aeb96e06c48_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_42750e00-c887-43dc-bb66-6aeb96e06c48" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_42750e00-c887-43dc-bb66-6aeb96e06c48_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_1eba080e-723a-4317-85cd-5d50cb0cb26d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_42750e00-c887-43dc-bb66-6aeb96e06c48" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_1eba080e-723a-4317-85cd-5d50cb0cb26d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticCountryMember_7b126e64-b9c8-487f-8207-e61a27effa62" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DomesticCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_1eba080e-723a-4317-85cd-5d50cb0cb26d" xlink:to="loc_us-gaap_DomesticCountryMember_7b126e64-b9c8-487f-8207-e61a27effa62" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCountryMember_02c1a8a0-903c-4e9c-bcbf-07f4d3ad0fb2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ForeignCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_1eba080e-723a-4317-85cd-5d50cb0cb26d" xlink:to="loc_us-gaap_ForeignCountryMember_02c1a8a0-903c-4e9c-bcbf-07f4d3ad0fb2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign_f900507e-9062-494c-9a3f-b812b2b467b0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_DeferredTaxAssetsAndLiabilitiesLineItems_9019d6cf-a4ae-4d96-ba18-c2dfd3ee02a0" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign_f900507e-9062-494c-9a3f-b812b2b467b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DeferredTaxAssetDisallowedInterestExpenseCarryforwards_1ee90250-b7d4-4138-bf29-e68b0e0aefd5" xlink:href="wynn-20231231.xsd#wynn_DeferredTaxAssetDisallowedInterestExpenseCarryforwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_DeferredTaxAssetsAndLiabilitiesLineItems_9019d6cf-a4ae-4d96-ba18-c2dfd3ee02a0" xlink:to="loc_wynn_DeferredTaxAssetDisallowedInterestExpenseCarryforwards_1ee90250-b7d4-4138-bf29-e68b0e0aefd5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_597de5f7-c179-4898-9f30-2cc4a02f5cbc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_DeferredTaxAssetsAndLiabilitiesLineItems_9019d6cf-a4ae-4d96-ba18-c2dfd3ee02a0" xlink:to="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_597de5f7-c179-4898-9f30-2cc4a02f5cbc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DeferredTaxAssetLeaseLiability_38264f0d-4266-47c5-808c-017d5a878a44" xlink:href="wynn-20231231.xsd#wynn_DeferredTaxAssetLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_DeferredTaxAssetsAndLiabilitiesLineItems_9019d6cf-a4ae-4d96-ba18-c2dfd3ee02a0" xlink:to="loc_wynn_DeferredTaxAssetLeaseLiability_38264f0d-4266-47c5-808c-017d5a878a44" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DeferredTaxAssetsConstructioninProgress_9e3ac15b-9ce8-4562-b2f2-8455b03e34fc" xlink:href="wynn-20231231.xsd#wynn_DeferredTaxAssetsConstructioninProgress"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_DeferredTaxAssetsAndLiabilitiesLineItems_9019d6cf-a4ae-4d96-ba18-c2dfd3ee02a0" xlink:to="loc_wynn_DeferredTaxAssetsConstructioninProgress_9e3ac15b-9ce8-4562-b2f2-8455b03e34fc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DeferredTaxAssetReceivableInventoriesAccruedLiabilitiesAndOther_a089f055-570d-4df9-b31e-97a6f32770d7" xlink:href="wynn-20231231.xsd#wynn_DeferredTaxAssetReceivableInventoriesAccruedLiabilitiesAndOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_DeferredTaxAssetsAndLiabilitiesLineItems_9019d6cf-a4ae-4d96-ba18-c2dfd3ee02a0" xlink:to="loc_wynn_DeferredTaxAssetReceivableInventoriesAccruedLiabilitiesAndOther_a089f055-570d-4df9-b31e-97a6f32770d7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_3f2dcf34-fbf2-4d86-a0c8-6f7ed0672177" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_DeferredTaxAssetsAndLiabilitiesLineItems_9019d6cf-a4ae-4d96-ba18-c2dfd3ee02a0" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_3f2dcf34-fbf2-4d86-a0c8-6f7ed0672177" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOtherTaxCarryforwards_345cc890-c1cf-4cf6-a5c8-638366f249af" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsOtherTaxCarryforwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_DeferredTaxAssetsAndLiabilitiesLineItems_9019d6cf-a4ae-4d96-ba18-c2dfd3ee02a0" xlink:to="loc_us-gaap_DeferredTaxAssetsOtherTaxCarryforwards_345cc890-c1cf-4cf6-a5c8-638366f249af" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DeferredTaxAssetIntangiblesAndRelatedOther_d6fe1883-1e97-44b9-bc8c-fe52f67a2de6" xlink:href="wynn-20231231.xsd#wynn_DeferredTaxAssetIntangiblesAndRelatedOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_DeferredTaxAssetsAndLiabilitiesLineItems_9019d6cf-a4ae-4d96-ba18-c2dfd3ee02a0" xlink:to="loc_wynn_DeferredTaxAssetIntangiblesAndRelatedOther_d6fe1883-1e97-44b9-bc8c-fe52f67a2de6" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOther_33271982-fa7b-42d3-af0d-6908946b08e0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_DeferredTaxAssetsAndLiabilitiesLineItems_9019d6cf-a4ae-4d96-ba18-c2dfd3ee02a0" xlink:to="loc_us-gaap_DeferredTaxAssetsOther_33271982-fa7b-42d3-af0d-6908946b08e0" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsGross_4574d396-38d0-49d0-abf2-30cb52b5f1a5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_DeferredTaxAssetsAndLiabilitiesLineItems_9019d6cf-a4ae-4d96-ba18-c2dfd3ee02a0" xlink:to="loc_us-gaap_DeferredTaxAssetsGross_4574d396-38d0-49d0-abf2-30cb52b5f1a5" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_40a8af70-3a65-40a1-ae18-4286404fed5b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_DeferredTaxAssetsAndLiabilitiesLineItems_9019d6cf-a4ae-4d96-ba18-c2dfd3ee02a0" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_40a8af70-3a65-40a1-ae18-4286404fed5b" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsNet_6f57a875-013c-4817-bea0-241cd4487907" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_DeferredTaxAssetsAndLiabilitiesLineItems_9019d6cf-a4ae-4d96-ba18-c2dfd3ee02a0" xlink:to="loc_us-gaap_DeferredTaxAssetsNet_6f57a875-013c-4817-bea0-241cd4487907" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesLeasingArrangements_25a89957-fd90-4e80-ac47-16706bbb55a2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxLiabilitiesLeasingArrangements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_DeferredTaxAssetsAndLiabilitiesLineItems_9019d6cf-a4ae-4d96-ba18-c2dfd3ee02a0" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesLeasingArrangements_25a89957-fd90-4e80-ac47-16706bbb55a2" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesPrepaidExpenses_ab8201de-b760-4ec5-a736-c088d20a2901" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxLiabilitiesPrepaidExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_DeferredTaxAssetsAndLiabilitiesLineItems_9019d6cf-a4ae-4d96-ba18-c2dfd3ee02a0" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesPrepaidExpenses_ab8201de-b760-4ec5-a736-c088d20a2901" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_67d2f2fa-2bb5-4d41-a5df-309ca7cd0d36" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_DeferredTaxAssetsAndLiabilitiesLineItems_9019d6cf-a4ae-4d96-ba18-c2dfd3ee02a0" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_67d2f2fa-2bb5-4d41-a5df-309ca7cd0d36" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesOther_2633f7cd-b590-4655-a443-33a9b98be382" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_DeferredTaxAssetsAndLiabilitiesLineItems_9019d6cf-a4ae-4d96-ba18-c2dfd3ee02a0" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesOther_2633f7cd-b590-4655-a443-33a9b98be382" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment_6fa1e0ae-5e69-49f2-b477-3b61fa7e25ac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_DeferredTaxAssetsAndLiabilitiesLineItems_9019d6cf-a4ae-4d96-ba18-c2dfd3ee02a0" xlink:to="loc_us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment_6fa1e0ae-5e69-49f2-b477-3b61fa7e25ac" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilities_542d46c6-4580-4ec1-b8d8-b9a1d7b63a8e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredIncomeTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_DeferredTaxAssetsAndLiabilitiesLineItems_9019d6cf-a4ae-4d96-ba18-c2dfd3ee02a0" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilities_542d46c6-4580-4ec1-b8d8-b9a1d7b63a8e" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_85a0d4f9-8a5a-45bc-8ad1-80e95230f637" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_DeferredTaxAssetsAndLiabilitiesLineItems_9019d6cf-a4ae-4d96-ba18-c2dfd3ee02a0" xlink:to="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_85a0d4f9-8a5a-45bc-8ad1-80e95230f637" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilities_1b55b19c-5d00-4d62-b7c5-460e1dc7d105" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_DeferredTaxAssetsAndLiabilitiesLineItems_9019d6cf-a4ae-4d96-ba18-c2dfd3ee02a0" xlink:to="loc_us-gaap_DeferredTaxLiabilities_1b55b19c-5d00-4d62-b7c5-460e1dc7d105" xlink:type="arc" order="20"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/IncomeTaxesSummaryofValuationAllowanceDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#IncomeTaxesSummaryofValuationAllowanceDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/IncomeTaxesSummaryofValuationAllowanceDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceLineItems_9671d3b9-feab-4d40-b975-c38f97a5f5bf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowanceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceTable_3d35ae92-bcab-4d83-b0f9-c9e0b1ba7d8e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowanceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_9671d3b9-feab-4d40-b975-c38f97a5f5bf" xlink:to="loc_us-gaap_ValuationAllowanceTable_3d35ae92-bcab-4d83-b0f9-c9e0b1ba7d8e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_6827081b-b12b-4df1-95fc-f41d504aa748" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowanceByDeferredTaxAssetAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ValuationAllowanceTable_3d35ae92-bcab-4d83-b0f9-c9e0b1ba7d8e" xlink:to="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_6827081b-b12b-4df1-95fc-f41d504aa748" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetDomain_6827081b-b12b-4df1-95fc-f41d504aa748_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_6827081b-b12b-4df1-95fc-f41d504aa748" xlink:to="loc_us-gaap_DeferredTaxAssetDomain_6827081b-b12b-4df1-95fc-f41d504aa748_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetDomain_c977b2e8-48b3-42f6-9724-0c3529ead377" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_6827081b-b12b-4df1-95fc-f41d504aa748" xlink:to="loc_us-gaap_DeferredTaxAssetDomain_c977b2e8-48b3-42f6-9724-0c3529ead377" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_ForeignTaxCreditsMember_bed3a154-37e0-46df-b4b0-b2b7d3917233" xlink:href="wynn-20231231.xsd#wynn_ForeignTaxCreditsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetDomain_c977b2e8-48b3-42f6-9724-0c3529ead377" xlink:to="loc_wynn_ForeignTaxCreditsMember_bed3a154-37e0-46df-b4b0-b2b7d3917233" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DisallowedInterestExpenseCarryforwardsMember_2f33bb30-2f77-4181-8ec4-65b2c1a01647" xlink:href="wynn-20231231.xsd#wynn_DisallowedInterestExpenseCarryforwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetDomain_c977b2e8-48b3-42f6-9724-0c3529ead377" xlink:to="loc_wynn_DisallowedInterestExpenseCarryforwardsMember_2f33bb30-2f77-4181-8ec4-65b2c1a01647" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_IntangibleAssetsMember_1daeabda-afc7-4e01-9d98-24201ca5c48c" xlink:href="wynn-20231231.xsd#wynn_IntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetDomain_c977b2e8-48b3-42f6-9724-0c3529ead377" xlink:to="loc_wynn_IntangibleAssetsMember_1daeabda-afc7-4e01-9d98-24201ca5c48c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_DomesticLossCarryforwardsMember_4b226c18-f7bd-4485-a353-33f6191256f4" xlink:href="wynn-20231231.xsd#wynn_DomesticLossCarryforwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetDomain_c977b2e8-48b3-42f6-9724-0c3529ead377" xlink:to="loc_wynn_DomesticLossCarryforwardsMember_4b226c18-f7bd-4485-a353-33f6191256f4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherDomesticDeferredTaxAssetsMember_3c56739a-29db-4e8e-956e-20f7b88036f0" xlink:href="wynn-20231231.xsd#wynn_OtherDomesticDeferredTaxAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetDomain_c977b2e8-48b3-42f6-9724-0c3529ead377" xlink:to="loc_wynn_OtherDomesticDeferredTaxAssetsMember_3c56739a-29db-4e8e-956e-20f7b88036f0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_ForeignLossCarryforwardsMember_f2574d46-e326-49c7-90f0-70e3637a1781" xlink:href="wynn-20231231.xsd#wynn_ForeignLossCarryforwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetDomain_c977b2e8-48b3-42f6-9724-0c3529ead377" xlink:to="loc_wynn_ForeignLossCarryforwardsMember_f2574d46-e326-49c7-90f0-70e3637a1781" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherForeignDeferredTaxAssetsMember_f8c3f684-49a4-4056-8d18-14c6e96a173b" xlink:href="wynn-20231231.xsd#wynn_OtherForeignDeferredTaxAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetDomain_c977b2e8-48b3-42f6-9724-0c3529ead377" xlink:to="loc_wynn_OtherForeignDeferredTaxAssetsMember_f8c3f684-49a4-4056-8d18-14c6e96a173b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_709acc56-af15-47c7-a461-b7c2f1c77588" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_9671d3b9-feab-4d40-b975-c38f97a5f5bf" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_709acc56-af15-47c7-a461-b7c2f1c77588" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/LeasesNarrativeDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#LeasesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/LeasesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_e0ec0854-1829-4fea-a64d-2ad1fec2488a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_47ab5faa-f2c7-48ed-9adf-70c9638410ef" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_e0ec0854-1829-4fea-a64d-2ad1fec2488a" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_47ab5faa-f2c7-48ed-9adf-70c9638410ef" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_c51f1aad-4539-46e8-9de5-f6ebc1d28c22" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_47ab5faa-f2c7-48ed-9adf-70c9638410ef" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_c51f1aad-4539-46e8-9de5-f6ebc1d28c22" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_c51f1aad-4539-46e8-9de5-f6ebc1d28c22_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_c51f1aad-4539-46e8-9de5-f6ebc1d28c22" xlink:to="loc_us-gaap_SegmentDomain_c51f1aad-4539-46e8-9de5-f6ebc1d28c22_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_24488013-d3b1-4d8f-ae8f-2af96df49d37" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_c51f1aad-4539-46e8-9de5-f6ebc1d28c22" xlink:to="loc_us-gaap_SegmentDomain_24488013-d3b1-4d8f-ae8f-2af96df49d37" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_EncoreBostonHarborMember_72da5ecc-94da-4832-884e-949cfe73f176" xlink:href="wynn-20231231.xsd#wynn_EncoreBostonHarborMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_24488013-d3b1-4d8f-ae8f-2af96df49d37" xlink:to="loc_wynn_EncoreBostonHarborMember_72da5ecc-94da-4832-884e-949cfe73f176" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_ffbd8364-7a65-4874-8f5c-bd73bf2d3c85" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_47ab5faa-f2c7-48ed-9adf-70c9638410ef" xlink:to="loc_srt_RangeAxis_ffbd8364-7a65-4874-8f5c-bd73bf2d3c85" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_ffbd8364-7a65-4874-8f5c-bd73bf2d3c85_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_ffbd8364-7a65-4874-8f5c-bd73bf2d3c85" xlink:to="loc_srt_RangeMember_ffbd8364-7a65-4874-8f5c-bd73bf2d3c85_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_4e3f891b-fa9f-4a8e-90b2-07ad6a0206cf" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_ffbd8364-7a65-4874-8f5c-bd73bf2d3c85" xlink:to="loc_srt_RangeMember_4e3f891b-fa9f-4a8e-90b2-07ad6a0206cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_1c761d9e-2bab-47fe-82a8-4a76904b4c2e" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_4e3f891b-fa9f-4a8e-90b2-07ad6a0206cf" xlink:to="loc_srt_MinimumMember_1c761d9e-2bab-47fe-82a8-4a76904b4c2e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_b89752ee-cff8-4217-a131-19d854bf7635" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_4e3f891b-fa9f-4a8e-90b2-07ad6a0206cf" xlink:to="loc_srt_MaximumMember_b89752ee-cff8-4217-a131-19d854bf7635" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_ce7ecb22-c21d-4e7c-98fb-557292fa9eb6" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_47ab5faa-f2c7-48ed-9adf-70c9638410ef" xlink:to="loc_srt_StatementGeographicalAxis_ce7ecb22-c21d-4e7c-98fb-557292fa9eb6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_ce7ecb22-c21d-4e7c-98fb-557292fa9eb6_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_ce7ecb22-c21d-4e7c-98fb-557292fa9eb6" xlink:to="loc_srt_SegmentGeographicalDomain_ce7ecb22-c21d-4e7c-98fb-557292fa9eb6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_7be1b58d-00ba-4a01-acdb-d49c5e28b4d0" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_ce7ecb22-c21d-4e7c-98fb-557292fa9eb6" xlink:to="loc_srt_SegmentGeographicalDomain_7be1b58d-00ba-4a01-acdb-d49c5e28b4d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_NV_23e25c3d-c39c-4f7e-9890-4060d76c767f" xlink:href="https://xbrl.sec.gov/stpr/2023/stpr-2023.xsd#stpr_NV"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_7be1b58d-00ba-4a01-acdb-d49c5e28b4d0" xlink:to="loc_stpr_NV_23e25c3d-c39c-4f7e-9890-4060d76c767f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_MO_c6962abb-6341-437c-a73f-791b9d29315a" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_MO"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_7be1b58d-00ba-4a01-acdb-d49c5e28b4d0" xlink:to="loc_country_MO_c6962abb-6341-437c-a73f-791b9d29315a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1d873eed-565a-456e-9570-91cdfa9f4884" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_47ab5faa-f2c7-48ed-9adf-70c9638410ef" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1d873eed-565a-456e-9570-91cdfa9f4884" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_1d873eed-565a-456e-9570-91cdfa9f4884_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1d873eed-565a-456e-9570-91cdfa9f4884" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_1d873eed-565a-456e-9570-91cdfa9f4884_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4dcb76ca-3f03-4cb9-a718-440e5ce9b0ce" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1d873eed-565a-456e-9570-91cdfa9f4884" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4dcb76ca-3f03-4cb9-a718-440e5ce9b0ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandMember_201896cf-c78b-49a8-b578-d28daad6d217" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4dcb76ca-3f03-4cb9-a718-440e5ce9b0ce" xlink:to="loc_us-gaap_LandMember_201896cf-c78b-49a8-b578-d28daad6d217" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_LeaseAmortizationAxis_fc29247c-193c-4b7f-82a9-e837f8b2ea66" xlink:href="wynn-20231231.xsd#wynn_LeaseAmortizationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_47ab5faa-f2c7-48ed-9adf-70c9638410ef" xlink:to="loc_wynn_LeaseAmortizationAxis_fc29247c-193c-4b7f-82a9-e837f8b2ea66" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_LeaseAmortizationDomain_fc29247c-193c-4b7f-82a9-e837f8b2ea66_default" xlink:href="wynn-20231231.xsd#wynn_LeaseAmortizationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_wynn_LeaseAmortizationAxis_fc29247c-193c-4b7f-82a9-e837f8b2ea66" xlink:to="loc_wynn_LeaseAmortizationDomain_fc29247c-193c-4b7f-82a9-e837f8b2ea66_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_LeaseAmortizationDomain_474716cd-7f60-46a7-87e7-b6892e6e017a" xlink:href="wynn-20231231.xsd#wynn_LeaseAmortizationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_wynn_LeaseAmortizationAxis_fc29247c-193c-4b7f-82a9-e837f8b2ea66" xlink:to="loc_wynn_LeaseAmortizationDomain_474716cd-7f60-46a7-87e7-b6892e6e017a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_AnnualAmortizationCurrentYearThrough2096Member_232727cb-f123-480e-b967-eec132b8d7d0" xlink:href="wynn-20231231.xsd#wynn_AnnualAmortizationCurrentYearThrough2096Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_LeaseAmortizationDomain_474716cd-7f60-46a7-87e7-b6892e6e017a" xlink:to="loc_wynn_AnnualAmortizationCurrentYearThrough2096Member_232727cb-f123-480e-b967-eec132b8d7d0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_AnnualAmortization2097Member_960f6369-8766-4c8f-9e85-855505e7aad6" xlink:href="wynn-20231231.xsd#wynn_AnnualAmortization2097Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_LeaseAmortizationDomain_474716cd-7f60-46a7-87e7-b6892e6e017a" xlink:to="loc_wynn_AnnualAmortization2097Member_960f6369-8766-4c8f-9e85-855505e7aad6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_AnnualAmortizationCurrentYearThrough2028Member_cdfa4dfd-b593-413f-ab48-ae36f85ff8eb" xlink:href="wynn-20231231.xsd#wynn_AnnualAmortizationCurrentYearThrough2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_LeaseAmortizationDomain_474716cd-7f60-46a7-87e7-b6892e6e017a" xlink:to="loc_wynn_AnnualAmortizationCurrentYearThrough2028Member_cdfa4dfd-b593-413f-ab48-ae36f85ff8eb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_AnnualAmortization2029Through2037Member_f309395f-e2f8-4234-8f3f-d08b475e96dc" xlink:href="wynn-20231231.xsd#wynn_AnnualAmortization2029Through2037Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_LeaseAmortizationDomain_474716cd-7f60-46a7-87e7-b6892e6e017a" xlink:to="loc_wynn_AnnualAmortization2029Through2037Member_f309395f-e2f8-4234-8f3f-d08b475e96dc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OperatingLeaseBaseRentIncreaseTermAxis_c0c2f00b-3ff7-4130-85fe-5adeca3e6ef8" xlink:href="wynn-20231231.xsd#wynn_OperatingLeaseBaseRentIncreaseTermAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_47ab5faa-f2c7-48ed-9adf-70c9638410ef" xlink:to="loc_wynn_OperatingLeaseBaseRentIncreaseTermAxis_c0c2f00b-3ff7-4130-85fe-5adeca3e6ef8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OperatingLeaseBaseRentIncreaseTermDomain_c0c2f00b-3ff7-4130-85fe-5adeca3e6ef8_default" xlink:href="wynn-20231231.xsd#wynn_OperatingLeaseBaseRentIncreaseTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_wynn_OperatingLeaseBaseRentIncreaseTermAxis_c0c2f00b-3ff7-4130-85fe-5adeca3e6ef8" xlink:to="loc_wynn_OperatingLeaseBaseRentIncreaseTermDomain_c0c2f00b-3ff7-4130-85fe-5adeca3e6ef8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OperatingLeaseBaseRentIncreaseTermDomain_fee62940-41b9-458b-879d-0da696e26dbd" xlink:href="wynn-20231231.xsd#wynn_OperatingLeaseBaseRentIncreaseTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_wynn_OperatingLeaseBaseRentIncreaseTermAxis_c0c2f00b-3ff7-4130-85fe-5adeca3e6ef8" xlink:to="loc_wynn_OperatingLeaseBaseRentIncreaseTermDomain_fee62940-41b9-458b-879d-0da696e26dbd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OperatingLeaseBaseRentIncreaseFirstTenYearsMember_4db274dc-384f-473a-b7ff-c939f09feec9" xlink:href="wynn-20231231.xsd#wynn_OperatingLeaseBaseRentIncreaseFirstTenYearsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_OperatingLeaseBaseRentIncreaseTermDomain_fee62940-41b9-458b-879d-0da696e26dbd" xlink:to="loc_wynn_OperatingLeaseBaseRentIncreaseFirstTenYearsMember_4db274dc-384f-473a-b7ff-c939f09feec9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OperatingLeaseBaseRentIncreaseRemainderOfLeaseTermMember_5d808034-5fcf-41db-bc06-d0011d5ed8b1" xlink:href="wynn-20231231.xsd#wynn_OperatingLeaseBaseRentIncreaseRemainderOfLeaseTermMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_OperatingLeaseBaseRentIncreaseTermDomain_fee62940-41b9-458b-879d-0da696e26dbd" xlink:to="loc_wynn_OperatingLeaseBaseRentIncreaseRemainderOfLeaseTermMember_5d808034-5fcf-41db-bc06-d0011d5ed8b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseTermOfContract_00644d05-5b59-41b4-8710-3bcdb93227e2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_e0ec0854-1829-4fea-a64d-2ad1fec2488a" xlink:to="loc_us-gaap_LesseeOperatingLeaseTermOfContract_00644d05-5b59-41b4-8710-3bcdb93227e2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_LesseeOperatingLeaseNumberOfRenewals_5f421372-169c-4702-8b15-d07359b09aef" xlink:href="wynn-20231231.xsd#wynn_LesseeOperatingLeaseNumberOfRenewals"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_e0ec0854-1829-4fea-a64d-2ad1fec2488a" xlink:to="loc_wynn_LesseeOperatingLeaseNumberOfRenewals_5f421372-169c-4702-8b15-d07359b09aef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_a5bccc0c-9b42-4318-8020-46ed49111cf7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseRenewalTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_e0ec0854-1829-4fea-a64d-2ad1fec2488a" xlink:to="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_a5bccc0c-9b42-4318-8020-46ed49111cf7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseExpense_180fc008-0d1c-4d77-bd3f-7b9fd1cfab19" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_e0ec0854-1829-4fea-a64d-2ad1fec2488a" xlink:to="loc_us-gaap_OperatingLeaseExpense_180fc008-0d1c-4d77-bd3f-7b9fd1cfab19" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OperatingLeaseExpenseFixedAnnualIncreasePercentage_5e82bc90-7e70-4060-a103-5c3becbb5aaa" xlink:href="wynn-20231231.xsd#wynn_OperatingLeaseExpenseFixedAnnualIncreasePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_e0ec0854-1829-4fea-a64d-2ad1fec2488a" xlink:to="loc_wynn_OperatingLeaseExpenseFixedAnnualIncreasePercentage_5e82bc90-7e70-4060-a103-5c3becbb5aaa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_55fe4cd5-aa4a-43bd-8f7f-cc9135457427" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_e0ec0854-1829-4fea-a64d-2ad1fec2488a" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_55fe4cd5-aa4a-43bd-8f7f-cc9135457427" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_6779de06-2e1b-4a2f-aa75-325c5ccb97a2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_e0ec0854-1829-4fea-a64d-2ad1fec2488a" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_6779de06-2e1b-4a2f-aa75-325c5ccb97a2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_9eea4b37-2183-4887-aba7-d92120b4359a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_e0ec0854-1829-4fea-a64d-2ad1fec2488a" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_9eea4b37-2183-4887-aba7-d92120b4359a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_d3936116-ecaf-41b8-a7f4-d741d4a0644c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_e0ec0854-1829-4fea-a64d-2ad1fec2488a" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_d3936116-ecaf-41b8-a7f4-d741d4a0644c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_902ede83-ee14-42df-a51b-eb5aee9223b5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_e0ec0854-1829-4fea-a64d-2ad1fec2488a" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_902ede83-ee14-42df-a51b-eb5aee9223b5" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_40ac2c4d-31b8-4600-95fa-ea6fcaeaebc6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_e0ec0854-1829-4fea-a64d-2ad1fec2488a" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_40ac2c4d-31b8-4600-95fa-ea6fcaeaebc6" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_69d514e6-8723-4082-af75-197842e78080" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_e0ec0854-1829-4fea-a64d-2ad1fec2488a" xlink:to="loc_us-gaap_OperatingLeaseLiability_69d514e6-8723-4082-af75-197842e78080" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_LesseeOperatingLeaseNumberofAcresofUndevelopedLand_5f8d7186-3ef8-4876-a69e-72d9ad280af4" xlink:href="wynn-20231231.xsd#wynn_LesseeOperatingLeaseNumberofAcresofUndevelopedLand"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_e0ec0854-1829-4fea-a64d-2ad1fec2488a" xlink:to="loc_wynn_LesseeOperatingLeaseNumberofAcresofUndevelopedLand_5f8d7186-3ef8-4876-a69e-72d9ad280af4" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_LesseeOperatingLeaseLiabilityToBePaidYearTwoThroughFive_0bb7f22b-919b-43f8-8170-12b2878deb05" xlink:href="wynn-20231231.xsd#wynn_LesseeOperatingLeaseLiabilityToBePaidYearTwoThroughFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_e0ec0854-1829-4fea-a64d-2ad1fec2488a" xlink:to="loc_wynn_LesseeOperatingLeaseLiabilityToBePaidYearTwoThroughFive_0bb7f22b-919b-43f8-8170-12b2878deb05" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_199c79fc-9c71-4f29-a257-af93ff5ea051" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_e0ec0854-1829-4fea-a64d-2ad1fec2488a" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_199c79fc-9c71-4f29-a257-af93ff5ea051" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_0ca78a7b-a31f-4256-a987-ec14b9bf9af3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_e0ec0854-1829-4fea-a64d-2ad1fec2488a" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_0ca78a7b-a31f-4256-a987-ec14b9bf9af3" xlink:type="arc" order="15"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/RelatedPartyTransactionsDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#RelatedPartyTransactionsDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/RelatedPartyTransactionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_f085f3c6-6481-47fc-ad49-9b1b7c0c94e2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_0dffe76e-f4f5-4a34-8f17-ebd7e5dc86df" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_f085f3c6-6481-47fc-ad49-9b1b7c0c94e2" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_0dffe76e-f4f5-4a34-8f17-ebd7e5dc86df" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_fac9126e-9bc0-48f8-b67a-12a24d043ab9" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_TitleOfIndividualAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_0dffe76e-f4f5-4a34-8f17-ebd7e5dc86df" xlink:to="loc_srt_TitleOfIndividualAxis_fac9126e-9bc0-48f8-b67a-12a24d043ab9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_fac9126e-9bc0-48f8-b67a-12a24d043ab9_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_TitleOfIndividualAxis_fac9126e-9bc0-48f8-b67a-12a24d043ab9" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_fac9126e-9bc0-48f8-b67a-12a24d043ab9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_f388e879-66b9-4a66-b091-3e0e3176831d" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_TitleOfIndividualAxis_fac9126e-9bc0-48f8-b67a-12a24d043ab9" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_f388e879-66b9-4a66-b091-3e0e3176831d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_PresidentMember_2c5c4d15-88a9-426c-8f39-e77c849a0860" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_PresidentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_f388e879-66b9-4a66-b091-3e0e3176831d" xlink:to="loc_srt_PresidentMember_2c5c4d15-88a9-426c-8f39-e77c849a0860" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_1230d009-e1ea-4a73-9ceb-f50cec1f2254" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_0dffe76e-f4f5-4a34-8f17-ebd7e5dc86df" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_1230d009-e1ea-4a73-9ceb-f50cec1f2254" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_1230d009-e1ea-4a73-9ceb-f50cec1f2254_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_1230d009-e1ea-4a73-9ceb-f50cec1f2254" xlink:to="loc_us-gaap_RelatedPartyDomain_1230d009-e1ea-4a73-9ceb-f50cec1f2254_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_4d1a6437-9888-4363-8ec6-d97051b1951d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_1230d009-e1ea-4a73-9ceb-f50cec1f2254" xlink:to="loc_us-gaap_RelatedPartyDomain_4d1a6437-9888-4363-8ec6-d97051b1951d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_422f1dc4-3e58-49e0-9ec3-537455463ade" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_4d1a6437-9888-4363-8ec6-d97051b1951d" xlink:to="loc_us-gaap_RelatedPartyMember_422f1dc4-3e58-49e0-9ec3-537455463ade" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_e4633676-80f1-4845-bfc0-b3afb2d7c059" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionAmountsOfTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_f085f3c6-6481-47fc-ad49-9b1b7c0c94e2" xlink:to="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_e4633676-80f1-4845-bfc0-b3afb2d7c059" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_c4e2ade6-6626-463e-826f-45373cb6b8ac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_f085f3c6-6481-47fc-ad49-9b1b7c0c94e2" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_c4e2ade6-6626-463e-826f-45373cb6b8ac" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/CommitmentsandContingenciesAdditionalInformationDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#CommitmentsandContingenciesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/CommitmentsandContingenciesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_wynn_CommitmentsAndContingenciesLineItems_e8b0f040-0835-4abc-a788-2b25cb43be7c" xlink:href="wynn-20231231.xsd#wynn_CommitmentsAndContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_CommitmentsAndContingenciesTable_a392015d-e951-478b-8898-f8a280e36c9a" xlink:href="wynn-20231231.xsd#wynn_CommitmentsAndContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_wynn_CommitmentsAndContingenciesLineItems_e8b0f040-0835-4abc-a788-2b25cb43be7c" xlink:to="loc_wynn_CommitmentsAndContingenciesTable_a392015d-e951-478b-8898-f8a280e36c9a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_c3decd64-eca0-4928-b58b-e596a0a83274" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCommitmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_CommitmentsAndContingenciesTable_a392015d-e951-478b-8898-f8a280e36c9a" xlink:to="loc_us-gaap_OtherCommitmentsAxis_c3decd64-eca0-4928-b58b-e596a0a83274" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_c3decd64-eca0-4928-b58b-e596a0a83274_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_c3decd64-eca0-4928-b58b-e596a0a83274" xlink:to="loc_us-gaap_OtherCommitmentsDomain_c3decd64-eca0-4928-b58b-e596a0a83274_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_26161d3e-2969-41af-87cd-ee4f30a63e76" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_c3decd64-eca0-4928-b58b-e596a0a83274" xlink:to="loc_us-gaap_OtherCommitmentsDomain_26161d3e-2969-41af-87cd-ee4f30a63e76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_MacauGamingAndNonGamingInvestmentsMember_559ec42e-787f-4174-be16-2c8ee49f711d" xlink:href="wynn-20231231.xsd#wynn_MacauGamingAndNonGamingInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_26161d3e-2969-41af-87cd-ee4f30a63e76" xlink:to="loc_wynn_MacauGamingAndNonGamingInvestmentsMember_559ec42e-787f-4174-be16-2c8ee49f711d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_MacauNonGamingCapitalProjectsMember_cc5ae3fe-e430-4687-8409-65e4c684598c" xlink:href="wynn-20231231.xsd#wynn_MacauNonGamingCapitalProjectsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_26161d3e-2969-41af-87cd-ee4f30a63e76" xlink:to="loc_wynn_MacauNonGamingCapitalProjectsMember_cc5ae3fe-e430-4687-8409-65e4c684598c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_MacauGamingConcessionMember_e853a536-5c35-47ab-b307-747347cde545" xlink:href="wynn-20231231.xsd#wynn_MacauGamingConcessionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_26161d3e-2969-41af-87cd-ee4f30a63e76" xlink:to="loc_wynn_MacauGamingConcessionMember_e853a536-5c35-47ab-b307-747347cde545" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmploymentContractsMember_e7525d49-314c-4eb6-b005-35a5c5595662" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmploymentContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_26161d3e-2969-41af-87cd-ee4f30a63e76" xlink:to="loc_us-gaap_EmploymentContractsMember_e7525d49-314c-4eb6-b005-35a5c5595662" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_bc530c43-7582-415b-bea5-e4228e32df2d" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_CommitmentsAndContingenciesTable_a392015d-e951-478b-8898-f8a280e36c9a" xlink:to="loc_dei_LegalEntityAxis_bc530c43-7582-415b-bea5-e4228e32df2d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_bc530c43-7582-415b-bea5-e4228e32df2d_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_bc530c43-7582-415b-bea5-e4228e32df2d" xlink:to="loc_dei_EntityDomain_bc530c43-7582-415b-bea5-e4228e32df2d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_8ef7a9e0-aafb-43d1-9c07-a3f26706090c" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_bc530c43-7582-415b-bea5-e4228e32df2d" xlink:to="loc_dei_EntityDomain_8ef7a9e0-aafb-43d1-9c07-a3f26706090c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnMacauSAMember_32b9965c-3a33-466e-a0bf-a915ddb8d7b9" xlink:href="wynn-20231231.xsd#wynn_WynnMacauSAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_8ef7a9e0-aafb-43d1-9c07-a3f26706090c" xlink:to="loc_wynn_WynnMacauSAMember_32b9965c-3a33-466e-a0bf-a915ddb8d7b9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentScenarioAxis_53e5873d-a993-4756-8295-aeef6366a6c1" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_CommitmentsAndContingenciesTable_a392015d-e951-478b-8898-f8a280e36c9a" xlink:to="loc_wynn_OtherCommitmentScenarioAxis_53e5873d-a993-4756-8295-aeef6366a6c1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentScenarioDomain_53e5873d-a993-4756-8295-aeef6366a6c1_default" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_wynn_OtherCommitmentScenarioAxis_53e5873d-a993-4756-8295-aeef6366a6c1" xlink:to="loc_wynn_OtherCommitmentScenarioDomain_53e5873d-a993-4756-8295-aeef6366a6c1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentScenarioDomain_607e69ce-2624-4a1c-8bde-c26f6dd5ee8b" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_wynn_OtherCommitmentScenarioAxis_53e5873d-a993-4756-8295-aeef6366a6c1" xlink:to="loc_wynn_OtherCommitmentScenarioDomain_607e69ce-2624-4a1c-8bde-c26f6dd5ee8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentScenarioOneMember_5c058be5-be42-4efe-9941-7a0e490dc024" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentScenarioOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_OtherCommitmentScenarioDomain_607e69ce-2624-4a1c-8bde-c26f6dd5ee8b" xlink:to="loc_wynn_OtherCommitmentScenarioOneMember_5c058be5-be42-4efe-9941-7a0e490dc024" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentScenarioTwoMember_1139cf6a-8b67-4901-8ab1-36ffcd1032e8" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentScenarioTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_OtherCommitmentScenarioDomain_607e69ce-2624-4a1c-8bde-c26f6dd5ee8b" xlink:to="loc_wynn_OtherCommitmentScenarioTwoMember_1139cf6a-8b67-4901-8ab1-36ffcd1032e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_cae5f844-c7a7-4edb-ba4f-67d7665cd004" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_CommitmentsAndContingenciesTable_a392015d-e951-478b-8898-f8a280e36c9a" xlink:to="loc_srt_OwnershipAxis_cae5f844-c7a7-4edb-ba4f-67d7665cd004" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_cae5f844-c7a7-4edb-ba4f-67d7665cd004_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_cae5f844-c7a7-4edb-ba4f-67d7665cd004" xlink:to="loc_srt_OwnershipDomain_cae5f844-c7a7-4edb-ba4f-67d7665cd004_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_41550559-5efa-440c-a68f-30d434b402a7" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_cae5f844-c7a7-4edb-ba4f-67d7665cd004" xlink:to="loc_srt_OwnershipDomain_41550559-5efa-440c-a68f-30d434b402a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_Island3AMIFZLLCMember_3f7ae302-0afd-416e-85dc-09368a6834ba" xlink:href="wynn-20231231.xsd#wynn_Island3AMIFZLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_41550559-5efa-440c-a68f-30d434b402a7" xlink:to="loc_wynn_Island3AMIFZLLCMember_3f7ae302-0afd-416e-85dc-09368a6834ba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_bbee4474-89f8-4637-9703-b19bb3895750" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wynn_CommitmentsAndContingenciesTable_a392015d-e951-478b-8898-f8a280e36c9a" xlink:to="loc_srt_RangeAxis_bbee4474-89f8-4637-9703-b19bb3895750" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_bbee4474-89f8-4637-9703-b19bb3895750_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_bbee4474-89f8-4637-9703-b19bb3895750" xlink:to="loc_srt_RangeMember_bbee4474-89f8-4637-9703-b19bb3895750_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_98a440d5-ee0e-4598-8e67-d3709e1e4bb9" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_bbee4474-89f8-4637-9703-b19bb3895750" xlink:to="loc_srt_RangeMember_98a440d5-ee0e-4598-8e67-d3709e1e4bb9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_fbe50c13-6a51-4a88-b439-ce85541f2028" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_98a440d5-ee0e-4598-8e67-d3709e1e4bb9" xlink:to="loc_srt_MinimumMember_fbe50c13-6a51-4a88-b439-ce85541f2028" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_f5558afd-028b-4c0c-b54b-ab1196fa2f38" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_98a440d5-ee0e-4598-8e67-d3709e1e4bb9" xlink:to="loc_srt_MaximumMember_f5558afd-028b-4c0c-b54b-ab1196fa2f38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitment_3ccaff41-9df6-453e-a99e-cfcbf2b04589" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCommitment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_CommitmentsAndContingenciesLineItems_e8b0f040-0835-4abc-a788-2b25cb43be7c" xlink:to="loc_us-gaap_OtherCommitment_3ccaff41-9df6-453e-a99e-cfcbf2b04589" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentTerm_f7338ca6-1c62-4569-b5f4-6accc8c512f7" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_CommitmentsAndContingenciesLineItems_e8b0f040-0835-4abc-a788-2b25cb43be7c" xlink:to="loc_wynn_OtherCommitmentTerm_f7338ca6-1c62-4569-b5f4-6accc8c512f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentPercentageOfCommitmentIncrease_8244aeb5-de7b-4152-84e0-1f40f89d24ac" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentPercentageOfCommitmentIncrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_CommitmentsAndContingenciesLineItems_e8b0f040-0835-4abc-a788-2b25cb43be7c" xlink:to="loc_wynn_OtherCommitmentPercentageOfCommitmentIncrease_8244aeb5-de7b-4152-84e0-1f40f89d24ac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentGamingPremiumAverageGrossTableGamingRevenueMinimum_1abccda9-3d23-48e6-92a7-2624555bd247" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentGamingPremiumAverageGrossTableGamingRevenueMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_CommitmentsAndContingenciesLineItems_e8b0f040-0835-4abc-a788-2b25cb43be7c" xlink:to="loc_wynn_OtherCommitmentGamingPremiumAverageGrossTableGamingRevenueMinimum_1abccda9-3d23-48e6-92a7-2624555bd247" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentGamingPremiumAverageGrossMachineGamingRevenueMinimum_86baed82-1ee3-42ef-8673-708d87203053" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentGamingPremiumAverageGrossMachineGamingRevenueMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_CommitmentsAndContingenciesLineItems_e8b0f040-0835-4abc-a788-2b25cb43be7c" xlink:to="loc_wynn_OtherCommitmentGamingPremiumAverageGrossMachineGamingRevenueMinimum_86baed82-1ee3-42ef-8673-708d87203053" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentSpecialLeviesPercentageOfGrossRevenue_21013b61-bf7f-40a5-a2fd-3eee726d45df" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentSpecialLeviesPercentageOfGrossRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_CommitmentsAndContingenciesLineItems_e8b0f040-0835-4abc-a788-2b25cb43be7c" xlink:to="loc_wynn_OtherCommitmentSpecialLeviesPercentageOfGrossRevenue_21013b61-bf7f-40a5-a2fd-3eee726d45df" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherCommitmentSpecialGamingTaxPercentageOfGrossRevenue_ece51165-653a-44fe-8ab6-2f5da814c612" xlink:href="wynn-20231231.xsd#wynn_OtherCommitmentSpecialGamingTaxPercentageOfGrossRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_CommitmentsAndContingenciesLineItems_e8b0f040-0835-4abc-a788-2b25cb43be7c" xlink:to="loc_wynn_OtherCommitmentSpecialGamingTaxPercentageOfGrossRevenue_ece51165-653a-44fe-8ab6-2f5da814c612" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_e77b9423-4caf-4d8f-9521-ef5b4aa0d052" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MinorityInterestOwnershipPercentageByParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_CommitmentsAndContingenciesLineItems_e8b0f040-0835-4abc-a788-2b25cb43be7c" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_e77b9423-4caf-4d8f-9521-ef5b4aa0d052" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyContributedCapitalToCommittedCapitalRatio_5cbce766-90bd-44e8-bec2-a1fb81aaba80" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InvestmentCompanyContributedCapitalToCommittedCapitalRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_CommitmentsAndContingenciesLineItems_e8b0f040-0835-4abc-a788-2b25cb43be7c" xlink:to="loc_us-gaap_InvestmentCompanyContributedCapitalToCommittedCapitalRatio_5cbce766-90bd-44e8-bec2-a1fb81aaba80" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_InitialTermOfEmploymentAgreement_d02361ec-ce8d-40a9-9ad7-98834117d6df" xlink:href="wynn-20231231.xsd#wynn_InitialTermOfEmploymentAgreement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_CommitmentsAndContingenciesLineItems_e8b0f040-0835-4abc-a788-2b25cb43be7c" xlink:to="loc_wynn_InitialTermOfEmploymentAgreement_d02361ec-ce8d-40a9-9ad7-98834117d6df" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentDueInNextTwelveMonths_9f6a9acc-4c16-4b47-9ce2-254030ac0f56" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCommitmentDueInNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_CommitmentsAndContingenciesLineItems_e8b0f040-0835-4abc-a788-2b25cb43be7c" xlink:to="loc_us-gaap_OtherCommitmentDueInNextTwelveMonths_9f6a9acc-4c16-4b47-9ce2-254030ac0f56" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentDueInSecondYear_be02e696-edbc-4f6a-9ad6-8252441920d2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCommitmentDueInSecondYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_CommitmentsAndContingenciesLineItems_e8b0f040-0835-4abc-a788-2b25cb43be7c" xlink:to="loc_us-gaap_OtherCommitmentDueInSecondYear_be02e696-edbc-4f6a-9ad6-8252441920d2" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentDueInThirdYear_43c27586-191a-41ac-b372-7ea4e24fe089" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCommitmentDueInThirdYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_CommitmentsAndContingenciesLineItems_e8b0f040-0835-4abc-a788-2b25cb43be7c" xlink:to="loc_us-gaap_OtherCommitmentDueInThirdYear_43c27586-191a-41ac-b372-7ea4e24fe089" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentDueInFourthYear_059c6db3-5dc6-4936-aed4-48b91fe12e28" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCommitmentDueInFourthYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_CommitmentsAndContingenciesLineItems_e8b0f040-0835-4abc-a788-2b25cb43be7c" xlink:to="loc_us-gaap_OtherCommitmentDueInFourthYear_059c6db3-5dc6-4936-aed4-48b91fe12e28" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentDueInFifthYear_a9248168-2843-42c4-b8c1-550e265d612b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCommitmentDueInFifthYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_CommitmentsAndContingenciesLineItems_e8b0f040-0835-4abc-a788-2b25cb43be7c" xlink:to="loc_us-gaap_OtherCommitmentDueInFifthYear_a9248168-2843-42c4-b8c1-550e265d612b" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentDueAfterFifthYear_2b439212-a4bb-4289-bf76-644e71190611" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCommitmentDueAfterFifthYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_CommitmentsAndContingenciesLineItems_e8b0f040-0835-4abc-a788-2b25cb43be7c" xlink:to="loc_us-gaap_OtherCommitmentDueAfterFifthYear_2b439212-a4bb-4289-bf76-644e71190611" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_68fa41cb-3d34-4068-99ad-dad9906f6d88" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_CommitmentsAndContingenciesLineItems_e8b0f040-0835-4abc-a788-2b25cb43be7c" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_68fa41cb-3d34-4068-99ad-dad9906f6d88" xlink:type="arc" order="16"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/RetailJointVentureDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#RetailJointVentureDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/RetailJointVentureDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_3b5cbdd0-553a-4345-9e24-c602b29d783d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableInterestEntityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_485f4e24-219e-4673-85d4-72f4301e27b9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_3b5cbdd0-553a-4345-9e24-c602b29d783d" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_485f4e24-219e-4673-85d4-72f4301e27b9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_509cedd9-7d55-4619-9641-d060560f441b" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_485f4e24-219e-4673-85d4-72f4301e27b9" xlink:to="loc_srt_ProductOrServiceAxis_509cedd9-7d55-4619-9641-d060560f441b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_509cedd9-7d55-4619-9641-d060560f441b_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_509cedd9-7d55-4619-9641-d060560f441b" xlink:to="loc_srt_ProductsAndServicesDomain_509cedd9-7d55-4619-9641-d060560f441b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_05cbd88e-5ec5-4ec4-aff5-cfc544585e39" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_509cedd9-7d55-4619-9641-d060560f441b" xlink:to="loc_srt_ProductsAndServicesDomain_05cbd88e-5ec5-4ec4-aff5-cfc544585e39" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetailMember_66f47b35-7292-44c6-921a-9ae65888e3bd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetailMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_05cbd88e-5ec5-4ec4-aff5-cfc544585e39" xlink:to="loc_us-gaap_RetailMember_66f47b35-7292-44c6-921a-9ae65888e3bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_4c53aa4b-dce2-4936-ab75-c09d984e8448" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_485f4e24-219e-4673-85d4-72f4301e27b9" xlink:to="loc_srt_OwnershipAxis_4c53aa4b-dce2-4936-ab75-c09d984e8448" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_4c53aa4b-dce2-4936-ab75-c09d984e8448_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_4c53aa4b-dce2-4936-ab75-c09d984e8448" xlink:to="loc_srt_OwnershipDomain_4c53aa4b-dce2-4936-ab75-c09d984e8448_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_5ed04850-d0f7-4b80-ac1a-80c06ec814d6" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_4c53aa4b-dce2-4936-ab75-c09d984e8448" xlink:to="loc_srt_OwnershipDomain_5ed04850-d0f7-4b80-ac1a-80c06ec814d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_RetailJointVentureMember_08061d55-4abe-45ec-afd6-daad6e1bc2a3" xlink:href="wynn-20231231.xsd#wynn_RetailJointVentureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_5ed04850-d0f7-4b80-ac1a-80c06ec814d6" xlink:to="loc_wynn_RetailJointVentureMember_08061d55-4abe-45ec-afd6-daad6e1bc2a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_aba8137a-10e1-40fb-ad8c-64e9980c95dc" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_485f4e24-219e-4673-85d4-72f4301e27b9" xlink:to="loc_dei_LegalEntityAxis_aba8137a-10e1-40fb-ad8c-64e9980c95dc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_aba8137a-10e1-40fb-ad8c-64e9980c95dc_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_aba8137a-10e1-40fb-ad8c-64e9980c95dc" xlink:to="loc_dei_EntityDomain_aba8137a-10e1-40fb-ad8c-64e9980c95dc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_a4a9669c-e611-4b1d-b922-c2d5ea3cbc08" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_aba8137a-10e1-40fb-ad8c-64e9980c95dc" xlink:to="loc_dei_EntityDomain_a4a9669c-e611-4b1d-b922-c2d5ea3cbc08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnRetailMember_4eca4653-c098-4455-bda4-bf285e5aff9e" xlink:href="wynn-20231231.xsd#wynn_WynnRetailMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_a4a9669c-e611-4b1d-b922-c2d5ea3cbc08" xlink:to="loc_wynn_WynnRetailMember_4eca4653-c098-4455-bda4-bf285e5aff9e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_RetailJointVentureMember_c333d2c6-d896-46d9-a28a-ed5cf303eb1c" xlink:href="wynn-20231231.xsd#wynn_RetailJointVentureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_a4a9669c-e611-4b1d-b922-c2d5ea3cbc08" xlink:to="loc_wynn_RetailJointVentureMember_c333d2c6-d896-46d9-a28a-ed5cf303eb1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FunctionalAreaSquareFootage_f5c4c1c2-4a42-429b-8607-797b3be5e2fc" xlink:href="wynn-20231231.xsd#wynn_FunctionalAreaSquareFootage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_3b5cbdd0-553a-4345-9e24-c602b29d783d" xlink:to="loc_wynn_FunctionalAreaSquareFootage_f5c4c1c2-4a42-429b-8607-797b3be5e2fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_FunctionalAreaSquareFootageUnderConstruction_49b732a4-cd28-4fd1-b5d8-288d0a1677e9" xlink:href="wynn-20231231.xsd#wynn_FunctionalAreaSquareFootageUnderConstruction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_3b5cbdd0-553a-4345-9e24-c602b29d783d" xlink:to="loc_wynn_FunctionalAreaSquareFootageUnderConstruction_49b732a4-cd28-4fd1-b5d8-288d0a1677e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OwnershipPercentage_4d08a723-105b-4686-ab5e-b4a18cfb51c7" xlink:href="wynn-20231231.xsd#wynn_OwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_3b5cbdd0-553a-4345-9e24-c602b29d783d" xlink:to="loc_wynn_OwnershipPercentage_4d08a723-105b-4686-ab5e-b4a18cfb51c7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_9ee635fd-d23a-406c-9e58-9ed7d4869183" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_3b5cbdd0-553a-4345-9e24-c602b29d783d" xlink:to="loc_us-gaap_Assets_9ee635fd-d23a-406c-9e58-9ed7d4869183" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_c51210c8-e270-467c-bd0a-5afdad799d5c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_3b5cbdd0-553a-4345-9e24-c602b29d783d" xlink:to="loc_us-gaap_Liabilities_c51210c8-e270-467c-bd0a-5afdad799d5c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_661cb0c2-d4c0-47f8-bd9d-f4359540602d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_3b5cbdd0-553a-4345-9e24-c602b29d783d" xlink:to="loc_us-gaap_LongTermDebt_661cb0c2-d4c0-47f8-bd9d-f4359540602d" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/SegmentInformationSummaryofResultsofOperationsbySegmentDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#SegmentInformationSummaryofResultsofOperationsbySegmentDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/SegmentInformationSummaryofResultsofOperationsbySegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_c7c637db-21d9-4038-890f-27ad29fbd0e7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_65ccc518-9d14-4f7f-8153-ba1f64b941ed" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_c7c637db-21d9-4038-890f-27ad29fbd0e7" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_65ccc518-9d14-4f7f-8153-ba1f64b941ed" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_f6bb6f2b-476b-4481-a4d9-5473b5c6f0f8" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_65ccc518-9d14-4f7f-8153-ba1f64b941ed" xlink:to="loc_srt_ConsolidationItemsAxis_f6bb6f2b-476b-4481-a4d9-5473b5c6f0f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_f6bb6f2b-476b-4481-a4d9-5473b5c6f0f8_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_f6bb6f2b-476b-4481-a4d9-5473b5c6f0f8" xlink:to="loc_srt_ConsolidationItemsDomain_f6bb6f2b-476b-4481-a4d9-5473b5c6f0f8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_7bbf03fb-1f04-4b01-8a6b-d6ca18475f22" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_f6bb6f2b-476b-4481-a4d9-5473b5c6f0f8" xlink:to="loc_srt_ConsolidationItemsDomain_7bbf03fb-1f04-4b01-8a6b-d6ca18475f22" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_96bf8f01-e934-419b-8bb8-ba71ff133c41" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_7bbf03fb-1f04-4b01-8a6b-d6ca18475f22" xlink:to="loc_us-gaap_OperatingSegmentsMember_96bf8f01-e934-419b-8bb8-ba71ff133c41" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_32132128-ef13-4d80-afc7-81e0d2f761c1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_7bbf03fb-1f04-4b01-8a6b-d6ca18475f22" xlink:to="loc_us-gaap_CorporateNonSegmentMember_32132128-ef13-4d80-afc7-81e0d2f761c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_ff8d7a70-a932-4400-a59f-6a445adf9a9d" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_65ccc518-9d14-4f7f-8153-ba1f64b941ed" xlink:to="loc_dei_LegalEntityAxis_ff8d7a70-a932-4400-a59f-6a445adf9a9d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_ff8d7a70-a932-4400-a59f-6a445adf9a9d_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_ff8d7a70-a932-4400-a59f-6a445adf9a9d" xlink:to="loc_dei_EntityDomain_ff8d7a70-a932-4400-a59f-6a445adf9a9d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_49648cad-49d2-45b8-a2c5-914fc1821c4c" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_ff8d7a70-a932-4400-a59f-6a445adf9a9d" xlink:to="loc_dei_EntityDomain_49648cad-49d2-45b8-a2c5-914fc1821c4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnPalaceMember_d2350e23-1bb0-445d-ac32-3a990d880311" xlink:href="wynn-20231231.xsd#wynn_WynnPalaceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_49648cad-49d2-45b8-a2c5-914fc1821c4c" xlink:to="loc_wynn_WynnPalaceMember_d2350e23-1bb0-445d-ac32-3a990d880311" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnMacauMember_1baf372d-1b37-40fa-ae85-24198ce6ac72" xlink:href="wynn-20231231.xsd#wynn_WynnMacauMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_49648cad-49d2-45b8-a2c5-914fc1821c4c" xlink:to="loc_wynn_WynnMacauMember_1baf372d-1b37-40fa-ae85-24198ce6ac72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_0727ac33-d0f4-4cef-887e-d39edbd9c0a2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_65ccc518-9d14-4f7f-8153-ba1f64b941ed" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_0727ac33-d0f4-4cef-887e-d39edbd9c0a2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_0727ac33-d0f4-4cef-887e-d39edbd9c0a2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_0727ac33-d0f4-4cef-887e-d39edbd9c0a2" xlink:to="loc_us-gaap_SegmentDomain_0727ac33-d0f4-4cef-887e-d39edbd9c0a2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_8be4dd60-d1ac-45db-b3bb-4a87d8f64d0a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_0727ac33-d0f4-4cef-887e-d39edbd9c0a2" xlink:to="loc_us-gaap_SegmentDomain_8be4dd60-d1ac-45db-b3bb-4a87d8f64d0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_MacauOperationsMember_54d64cd3-cdc9-498c-9e3e-8435a160d7a7" xlink:href="wynn-20231231.xsd#wynn_MacauOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8be4dd60-d1ac-45db-b3bb-4a87d8f64d0a" xlink:to="loc_wynn_MacauOperationsMember_54d64cd3-cdc9-498c-9e3e-8435a160d7a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_LasVegasOperationsMember_273894fc-69ed-4b63-b321-852a44914b05" xlink:href="wynn-20231231.xsd#wynn_LasVegasOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8be4dd60-d1ac-45db-b3bb-4a87d8f64d0a" xlink:to="loc_wynn_LasVegasOperationsMember_273894fc-69ed-4b63-b321-852a44914b05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_EncoreBostonHarborMember_54f48af5-cc7d-46b8-82aa-e6ccf35696ae" xlink:href="wynn-20231231.xsd#wynn_EncoreBostonHarborMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8be4dd60-d1ac-45db-b3bb-4a87d8f64d0a" xlink:to="loc_wynn_EncoreBostonHarborMember_54f48af5-cc7d-46b8-82aa-e6ccf35696ae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnInteractiveMember_cac88883-56db-4164-b124-3bcf2104df06" xlink:href="wynn-20231231.xsd#wynn_WynnInteractiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8be4dd60-d1ac-45db-b3bb-4a87d8f64d0a" xlink:to="loc_wynn_WynnInteractiveMember_cac88883-56db-4164-b124-3bcf2104df06" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_e048e5cb-9c87-4c5a-834e-3ff263dcd9bf" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_65ccc518-9d14-4f7f-8153-ba1f64b941ed" xlink:to="loc_srt_ProductOrServiceAxis_e048e5cb-9c87-4c5a-834e-3ff263dcd9bf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_e048e5cb-9c87-4c5a-834e-3ff263dcd9bf_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_e048e5cb-9c87-4c5a-834e-3ff263dcd9bf" xlink:to="loc_srt_ProductsAndServicesDomain_e048e5cb-9c87-4c5a-834e-3ff263dcd9bf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_6629c546-7b96-4a84-b70b-11e4d01ff0b6" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_e048e5cb-9c87-4c5a-834e-3ff263dcd9bf" xlink:to="loc_srt_ProductsAndServicesDomain_6629c546-7b96-4a84-b70b-11e4d01ff0b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CasinoMember_38a64325-bd84-44d8-8ed1-ea7a8b0774ce" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CasinoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_6629c546-7b96-4a84-b70b-11e4d01ff0b6" xlink:to="loc_us-gaap_CasinoMember_38a64325-bd84-44d8-8ed1-ea7a8b0774ce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OccupancyMember_feb592ae-5304-4ee8-92d7-5fbc17a77684" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OccupancyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_6629c546-7b96-4a84-b70b-11e4d01ff0b6" xlink:to="loc_us-gaap_OccupancyMember_feb592ae-5304-4ee8-92d7-5fbc17a77684" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FoodAndBeverageMember_d1f59588-0eb1-4891-9071-4ab6b60915ee" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FoodAndBeverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_6629c546-7b96-4a84-b70b-11e4d01ff0b6" xlink:to="loc_us-gaap_FoodAndBeverageMember_d1f59588-0eb1-4891-9071-4ab6b60915ee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_EntertainmentRetailAndOtherMember_39096fc7-b161-4971-b93c-87e701b4ab31" xlink:href="wynn-20231231.xsd#wynn_EntertainmentRetailAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_6629c546-7b96-4a84-b70b-11e4d01ff0b6" xlink:to="loc_wynn_EntertainmentRetailAndOtherMember_39096fc7-b161-4971-b93c-87e701b4ab31" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_f0310530-1027-4298-b6c6-8eeeaace72e6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_65ccc518-9d14-4f7f-8153-ba1f64b941ed" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_f0310530-1027-4298-b6c6-8eeeaace72e6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_f0310530-1027-4298-b6c6-8eeeaace72e6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_f0310530-1027-4298-b6c6-8eeeaace72e6" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_f0310530-1027-4298-b6c6-8eeeaace72e6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_84d51ab9-104d-409f-b89f-a2b4d80481fb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_f0310530-1027-4298-b6c6-8eeeaace72e6" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_84d51ab9-104d-409f-b89f-a2b4d80481fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_a33a6df0-e44d-4253-a0ee-67df5a72fac1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GeneralAndAdministrativeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_84d51ab9-104d-409f-b89f-a2b4d80481fb" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_a33a6df0-e44d-4253-a0ee-67df5a72fac1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_ef442173-4cef-4df3-9dfd-7fad8e9348f4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_c7c637db-21d9-4038-890f-27ad29fbd0e7" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_ef442173-4cef-4df3-9dfd-7fad8e9348f4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_AdjustedPropertyEbitdar_8eda65b1-0131-43d4-b897-9811d95a9472" xlink:href="wynn-20231231.xsd#wynn_AdjustedPropertyEbitdar"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_c7c637db-21d9-4038-890f-27ad29fbd0e7" xlink:to="loc_wynn_AdjustedPropertyEbitdar_8eda65b1-0131-43d4-b897-9811d95a9472" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherOperatingCostsAndExpensesAbstract_e9f6bd97-e274-4952-94c3-93982023715e" xlink:href="wynn-20231231.xsd#wynn_OtherOperatingCostsAndExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_c7c637db-21d9-4038-890f-27ad29fbd0e7" xlink:to="loc_wynn_OtherOperatingCostsAndExpensesAbstract_e9f6bd97-e274-4952-94c3-93982023715e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreOpeningCosts_50d9152d-248d-4a34-9fa3-b67914ef0aaf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreOpeningCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_OtherOperatingCostsAndExpensesAbstract_e9f6bd97-e274-4952-94c3-93982023715e" xlink:to="loc_us-gaap_PreOpeningCosts_50d9152d-248d-4a34-9fa3-b67914ef0aaf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_d046d495-492e-49ad-9ff5-61e77c54fbe2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_OtherOperatingCostsAndExpensesAbstract_e9f6bd97-e274-4952-94c3-93982023715e" xlink:to="loc_us-gaap_DepreciationAndAmortization_d046d495-492e-49ad-9ff5-61e77c54fbe2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleAndLeasebackTransactionGainLossNet_3575a1aa-1036-4a21-a54f-7d5957971e72" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SaleAndLeasebackTransactionGainLossNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_OtherOperatingCostsAndExpensesAbstract_e9f6bd97-e274-4952-94c3-93982023715e" xlink:to="loc_us-gaap_SaleAndLeasebackTransactionGainLossNet_3575a1aa-1036-4a21-a54f-7d5957971e72" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_ProjectAbandonmentCosts_9d01bc66-dd21-485b-9004-29e806cb587b" xlink:href="wynn-20231231.xsd#wynn_ProjectAbandonmentCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_OtherOperatingCostsAndExpensesAbstract_e9f6bd97-e274-4952-94c3-93982023715e" xlink:to="loc_wynn_ProjectAbandonmentCosts_9d01bc66-dd21-485b-9004-29e806cb587b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_CorporateExpensesAndOther_f9c59dde-5002-4eb2-a3e0-c92fbcb6f384" xlink:href="wynn-20231231.xsd#wynn_CorporateExpensesAndOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_OtherOperatingCostsAndExpensesAbstract_e9f6bd97-e274-4952-94c3-93982023715e" xlink:to="loc_wynn_CorporateExpensesAndOther_f9c59dde-5002-4eb2-a3e0-c92fbcb6f384" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_dbbbe8d5-1cf2-47fd-87c2-749122ba071b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_OtherOperatingCostsAndExpensesAbstract_e9f6bd97-e274-4952-94c3-93982023715e" xlink:to="loc_us-gaap_ShareBasedCompensation_dbbbe8d5-1cf2-47fd-87c2-749122ba071b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OperatingLeaseTripleNetCost_f83a578e-9577-4366-8dd1-66776e67b526" xlink:href="wynn-20231231.xsd#wynn_OperatingLeaseTripleNetCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_OtherOperatingCostsAndExpensesAbstract_e9f6bd97-e274-4952-94c3-93982023715e" xlink:to="loc_wynn_OperatingLeaseTripleNetCost_f83a578e-9577-4366-8dd1-66776e67b526" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCostAndExpenseOperating_69b6b280-47d5-412e-9dad-79297224cd26" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCostAndExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wynn_OtherOperatingCostsAndExpensesAbstract_e9f6bd97-e274-4952-94c3-93982023715e" xlink:to="loc_us-gaap_OtherCostAndExpenseOperating_69b6b280-47d5-412e-9dad-79297224cd26" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_0b43fb60-5851-4abd-8c30-3f5069755453" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_c7c637db-21d9-4038-890f-27ad29fbd0e7" xlink:to="loc_us-gaap_OperatingIncomeLoss_0b43fb60-5851-4abd-8c30-3f5069755453" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpenseAbstract_68681b5d-98f5-44b1-8d6c-e202ecac99a8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NonoperatingIncomeExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_c7c637db-21d9-4038-890f-27ad29fbd0e7" xlink:to="loc_us-gaap_NonoperatingIncomeExpenseAbstract_68681b5d-98f5-44b1-8d6c-e202ecac99a8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInterest_3c5ee357-9c54-476b-a8f6-cd757d19a4aa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InvestmentIncomeInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_68681b5d-98f5-44b1-8d6c-e202ecac99a8" xlink:to="loc_us-gaap_InvestmentIncomeInterest_3c5ee357-9c54-476b-a8f6-cd757d19a4aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_6df1bac3-fcb8-41fc-8855-707d20982b85" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_68681b5d-98f5-44b1-8d6c-e202ecac99a8" xlink:to="loc_us-gaap_InterestExpense_6df1bac3-fcb8-41fc-8855-707d20982b85" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_852e467b-74ea-465f-9df1-ed98587ba82c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainLossOnDerivativeInstrumentsNetPretax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_68681b5d-98f5-44b1-8d6c-e202ecac99a8" xlink:to="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_852e467b-74ea-465f-9df1-ed98587ba82c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_ba443901-cc12-4b16-aace-6b0ca5e2ea6a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_68681b5d-98f5-44b1-8d6c-e202ecac99a8" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_ba443901-cc12-4b16-aace-6b0ca5e2ea6a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_b5ae5bd8-e7db-4a95-b44c-9c605003f8c7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_68681b5d-98f5-44b1-8d6c-e202ecac99a8" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_b5ae5bd8-e7db-4a95-b44c-9c605003f8c7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_2fdad2bd-287e-4994-a400-a53082e24887" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_68681b5d-98f5-44b1-8d6c-e202ecac99a8" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_2fdad2bd-287e-4994-a400-a53082e24887" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_b47c95f2-c886-41be-8c90-3ae4aeaf89e2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_c7c637db-21d9-4038-890f-27ad29fbd0e7" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_b47c95f2-c886-41be-8c90-3ae4aeaf89e2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_d78b86f4-4834-41bf-a18d-e1117c37defb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_c7c637db-21d9-4038-890f-27ad29fbd0e7" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_d78b86f4-4834-41bf-a18d-e1117c37defb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_a2abd1d1-bb1c-4387-9e27-1706f12d66b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_c7c637db-21d9-4038-890f-27ad29fbd0e7" xlink:to="loc_us-gaap_ProfitLoss_a2abd1d1-bb1c-4387-9e27-1706f12d66b2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_4a45ecfb-c881-4abe-b66a-9328553a2306" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_c7c637db-21d9-4038-890f-27ad29fbd0e7" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_4a45ecfb-c881-4abe-b66a-9328553a2306" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_4155e682-8ae8-44b3-a0de-90d9c994c484" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_c7c637db-21d9-4038-890f-27ad29fbd0e7" xlink:to="loc_us-gaap_NetIncomeLoss_4155e682-8ae8-44b3-a0de-90d9c994c484" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_ProjectAbandonmentCostsContractTerminationLiabilities_d9855e50-86aa-4d5b-a1e9-955ac7365129" xlink:href="wynn-20231231.xsd#wynn_ProjectAbandonmentCostsContractTerminationLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_c7c637db-21d9-4038-890f-27ad29fbd0e7" xlink:to="loc_wynn_ProjectAbandonmentCostsContractTerminationLiabilities_d9855e50-86aa-4d5b-a1e9-955ac7365129" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/SegmentInformationScheduleofCapitalExpendituresDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#SegmentInformationScheduleofCapitalExpendituresDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/SegmentInformationScheduleofCapitalExpendituresDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_b1dcda4b-2c95-4546-baed-c28cf534c870" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_28147ead-7888-4c03-a256-bfdf5aceeea5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_b1dcda4b-2c95-4546-baed-c28cf534c870" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_28147ead-7888-4c03-a256-bfdf5aceeea5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_d10004dc-a15a-45e2-a53f-22643c96262e" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_28147ead-7888-4c03-a256-bfdf5aceeea5" xlink:to="loc_dei_LegalEntityAxis_d10004dc-a15a-45e2-a53f-22643c96262e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_d10004dc-a15a-45e2-a53f-22643c96262e_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_d10004dc-a15a-45e2-a53f-22643c96262e" xlink:to="loc_dei_EntityDomain_d10004dc-a15a-45e2-a53f-22643c96262e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_4f28f125-0b40-4d3a-a344-f6414adba87b" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_d10004dc-a15a-45e2-a53f-22643c96262e" xlink:to="loc_dei_EntityDomain_4f28f125-0b40-4d3a-a344-f6414adba87b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnPalaceMember_de00d76f-62b5-4287-86e8-079d8e212f9a" xlink:href="wynn-20231231.xsd#wynn_WynnPalaceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_4f28f125-0b40-4d3a-a344-f6414adba87b" xlink:to="loc_wynn_WynnPalaceMember_de00d76f-62b5-4287-86e8-079d8e212f9a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnMacauMember_48afbb03-7f49-475c-8130-677d5ff00f76" xlink:href="wynn-20231231.xsd#wynn_WynnMacauMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_4f28f125-0b40-4d3a-a344-f6414adba87b" xlink:to="loc_wynn_WynnMacauMember_48afbb03-7f49-475c-8130-677d5ff00f76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_dc19dbbb-f7aa-4c26-9c15-a7f9319e9fa7" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_28147ead-7888-4c03-a256-bfdf5aceeea5" xlink:to="loc_srt_ConsolidationItemsAxis_dc19dbbb-f7aa-4c26-9c15-a7f9319e9fa7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_dc19dbbb-f7aa-4c26-9c15-a7f9319e9fa7_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_dc19dbbb-f7aa-4c26-9c15-a7f9319e9fa7" xlink:to="loc_srt_ConsolidationItemsDomain_dc19dbbb-f7aa-4c26-9c15-a7f9319e9fa7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_32766758-8bfa-47ae-86e9-a5734832ba6a" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_dc19dbbb-f7aa-4c26-9c15-a7f9319e9fa7" xlink:to="loc_srt_ConsolidationItemsDomain_32766758-8bfa-47ae-86e9-a5734832ba6a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_1a84f1a3-7470-41ec-8f74-15d96fad712d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_32766758-8bfa-47ae-86e9-a5734832ba6a" xlink:to="loc_us-gaap_OperatingSegmentsMember_1a84f1a3-7470-41ec-8f74-15d96fad712d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_c48aa915-3943-4d65-8ddb-f8113e623de3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_28147ead-7888-4c03-a256-bfdf5aceeea5" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_c48aa915-3943-4d65-8ddb-f8113e623de3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_c48aa915-3943-4d65-8ddb-f8113e623de3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_c48aa915-3943-4d65-8ddb-f8113e623de3" xlink:to="loc_us-gaap_SegmentDomain_c48aa915-3943-4d65-8ddb-f8113e623de3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_959da3e1-5a49-4486-8675-82de64001d04" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_c48aa915-3943-4d65-8ddb-f8113e623de3" xlink:to="loc_us-gaap_SegmentDomain_959da3e1-5a49-4486-8675-82de64001d04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_MacauOperationsMember_83a60329-05df-4dbe-9b6d-54aeb57fd6ba" xlink:href="wynn-20231231.xsd#wynn_MacauOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_959da3e1-5a49-4486-8675-82de64001d04" xlink:to="loc_wynn_MacauOperationsMember_83a60329-05df-4dbe-9b6d-54aeb57fd6ba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_LasVegasOperationsMember_11052a77-a377-4022-918b-193bead103f3" xlink:href="wynn-20231231.xsd#wynn_LasVegasOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_959da3e1-5a49-4486-8675-82de64001d04" xlink:to="loc_wynn_LasVegasOperationsMember_11052a77-a377-4022-918b-193bead103f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_EncoreBostonHarborMember_6f5ac95a-e27e-414c-9b31-27064d716001" xlink:href="wynn-20231231.xsd#wynn_EncoreBostonHarborMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_959da3e1-5a49-4486-8675-82de64001d04" xlink:to="loc_wynn_EncoreBostonHarborMember_6f5ac95a-e27e-414c-9b31-27064d716001" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnInteractiveMember_5ce980fe-ac00-4051-9497-140f279ca7e5" xlink:href="wynn-20231231.xsd#wynn_WynnInteractiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_959da3e1-5a49-4486-8675-82de64001d04" xlink:to="loc_wynn_WynnInteractiveMember_5ce980fe-ac00-4051-9497-140f279ca7e5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateAndOtherMember_c60cc764-daee-4a41-80ec-9d629dad34a4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CorporateAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_959da3e1-5a49-4486-8675-82de64001d04" xlink:to="loc_us-gaap_CorporateAndOtherMember_c60cc764-daee-4a41-80ec-9d629dad34a4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_ccfbac12-b2ae-46ad-b0ce-6222b8bc2595" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentExpenditureAdditionToLongLivedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_b1dcda4b-2c95-4546-baed-c28cf534c870" xlink:to="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_ccfbac12-b2ae-46ad-b0ce-6222b8bc2595" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/SegmentInformationSummaryofAssetsbySegmentDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#SegmentInformationSummaryofAssetsbySegmentDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/SegmentInformationSummaryofAssetsbySegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_e99e798d-66ba-4e1a-a099-2b8fa1914b73" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_794fed00-c027-4c96-b8b0-ad9810bb06bd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_e99e798d-66ba-4e1a-a099-2b8fa1914b73" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_794fed00-c027-4c96-b8b0-ad9810bb06bd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_ce9c2249-d1bf-42c3-be8a-7062694aefd1" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_794fed00-c027-4c96-b8b0-ad9810bb06bd" xlink:to="loc_dei_LegalEntityAxis_ce9c2249-d1bf-42c3-be8a-7062694aefd1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_ce9c2249-d1bf-42c3-be8a-7062694aefd1_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_ce9c2249-d1bf-42c3-be8a-7062694aefd1" xlink:to="loc_dei_EntityDomain_ce9c2249-d1bf-42c3-be8a-7062694aefd1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_3269328c-84f4-4e8b-89f3-45f6027551c4" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_ce9c2249-d1bf-42c3-be8a-7062694aefd1" xlink:to="loc_dei_EntityDomain_3269328c-84f4-4e8b-89f3-45f6027551c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnPalaceMember_0e15e3d1-ec79-4b72-a411-928e64f39554" xlink:href="wynn-20231231.xsd#wynn_WynnPalaceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_3269328c-84f4-4e8b-89f3-45f6027551c4" xlink:to="loc_wynn_WynnPalaceMember_0e15e3d1-ec79-4b72-a411-928e64f39554" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnMacauMember_f4b7f15d-bd3a-485f-a618-33addda98b47" xlink:href="wynn-20231231.xsd#wynn_WynnMacauMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_3269328c-84f4-4e8b-89f3-45f6027551c4" xlink:to="loc_wynn_WynnMacauMember_f4b7f15d-bd3a-485f-a618-33addda98b47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_OtherMacauMember_67c449f3-20e4-4611-8872-32b124211a73" xlink:href="wynn-20231231.xsd#wynn_OtherMacauMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_3269328c-84f4-4e8b-89f3-45f6027551c4" xlink:to="loc_wynn_OtherMacauMember_67c449f3-20e4-4611-8872-32b124211a73" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_74a9e32f-6c01-48c7-9b49-2f954eb75580" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_794fed00-c027-4c96-b8b0-ad9810bb06bd" xlink:to="loc_srt_ConsolidationItemsAxis_74a9e32f-6c01-48c7-9b49-2f954eb75580" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_74a9e32f-6c01-48c7-9b49-2f954eb75580_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_74a9e32f-6c01-48c7-9b49-2f954eb75580" xlink:to="loc_srt_ConsolidationItemsDomain_74a9e32f-6c01-48c7-9b49-2f954eb75580_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_5783cf09-becb-4f43-90f0-bb1c5a527ec7" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_74a9e32f-6c01-48c7-9b49-2f954eb75580" xlink:to="loc_srt_ConsolidationItemsDomain_5783cf09-becb-4f43-90f0-bb1c5a527ec7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_4fc6f8aa-5c37-4611-baad-acca79a696a7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_5783cf09-becb-4f43-90f0-bb1c5a527ec7" xlink:to="loc_us-gaap_OperatingSegmentsMember_4fc6f8aa-5c37-4611-baad-acca79a696a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_2549373e-617c-4752-aa6c-053c83d74420" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_794fed00-c027-4c96-b8b0-ad9810bb06bd" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_2549373e-617c-4752-aa6c-053c83d74420" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_2549373e-617c-4752-aa6c-053c83d74420_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_2549373e-617c-4752-aa6c-053c83d74420" xlink:to="loc_us-gaap_SegmentDomain_2549373e-617c-4752-aa6c-053c83d74420_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_e02d156f-a823-4da3-9972-6f60ae486e86" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_2549373e-617c-4752-aa6c-053c83d74420" xlink:to="loc_us-gaap_SegmentDomain_e02d156f-a823-4da3-9972-6f60ae486e86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_MacauOperationsMember_bf3e89fa-98a4-4df6-9317-71b4be0614dc" xlink:href="wynn-20231231.xsd#wynn_MacauOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_e02d156f-a823-4da3-9972-6f60ae486e86" xlink:to="loc_wynn_MacauOperationsMember_bf3e89fa-98a4-4df6-9317-71b4be0614dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_LasVegasOperationsMember_8fdec6c0-8eb4-4f80-acd5-2de7c54192ce" xlink:href="wynn-20231231.xsd#wynn_LasVegasOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_e02d156f-a823-4da3-9972-6f60ae486e86" xlink:to="loc_wynn_LasVegasOperationsMember_8fdec6c0-8eb4-4f80-acd5-2de7c54192ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_EncoreBostonHarborMember_2a89db82-42b7-40c5-9556-e4d4e5f2a624" xlink:href="wynn-20231231.xsd#wynn_EncoreBostonHarborMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_e02d156f-a823-4da3-9972-6f60ae486e86" xlink:to="loc_wynn_EncoreBostonHarborMember_2a89db82-42b7-40c5-9556-e4d4e5f2a624" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wynn_WynnInteractiveMember_2963a1d2-5b7c-4058-8e3f-fe87d628b9a3" xlink:href="wynn-20231231.xsd#wynn_WynnInteractiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_e02d156f-a823-4da3-9972-6f60ae486e86" xlink:to="loc_wynn_WynnInteractiveMember_2963a1d2-5b7c-4058-8e3f-fe87d628b9a3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateAndOtherMember_ada9d10f-55ca-475e-8b9f-1b796aa6dd83" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CorporateAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_e02d156f-a823-4da3-9972-6f60ae486e86" xlink:to="loc_us-gaap_CorporateAndOtherMember_ada9d10f-55ca-475e-8b9f-1b796aa6dd83" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_f204ce0a-c93c-4453-b4b9-632cf1c96c7f" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_794fed00-c027-4c96-b8b0-ad9810bb06bd" xlink:to="loc_srt_StatementGeographicalAxis_f204ce0a-c93c-4453-b4b9-632cf1c96c7f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_f204ce0a-c93c-4453-b4b9-632cf1c96c7f_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_f204ce0a-c93c-4453-b4b9-632cf1c96c7f" xlink:to="loc_srt_SegmentGeographicalDomain_f204ce0a-c93c-4453-b4b9-632cf1c96c7f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_5090d9ec-3d0a-4b74-b3c3-84304cbfe1e4" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_f204ce0a-c93c-4453-b4b9-632cf1c96c7f" xlink:to="loc_srt_SegmentGeographicalDomain_5090d9ec-3d0a-4b74-b3c3-84304cbfe1e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_MO_a5476175-c372-4569-a132-2290cda8965a" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_MO"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_5090d9ec-3d0a-4b74-b3c3-84304cbfe1e4" xlink:to="loc_country_MO_a5476175-c372-4569-a132-2290cda8965a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_3cd50bfb-bcb9-4ee8-9445-81a9592fce25" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_5090d9ec-3d0a-4b74-b3c3-84304cbfe1e4" xlink:to="loc_country_US_3cd50bfb-bcb9-4ee8-9445-81a9592fce25" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_db24cb78-1f6b-4e03-a0a7-aefd081724b1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_e99e798d-66ba-4e1a-a099-2b8fa1914b73" xlink:to="loc_us-gaap_Assets_db24cb78-1f6b-4e03-a0a7-aefd081724b1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncurrentAssets_14fe6452-660c-46a3-a34d-030b3795b01f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_e99e798d-66ba-4e1a-a099-2b8fa1914b73" xlink:to="loc_us-gaap_NoncurrentAssets_14fe6452-660c-46a3-a34d-030b3795b01f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wynnresorts.com/role/ScheduleIIValuationandQualifyingAccountsDetails" xlink:type="simple" xlink:href="wynn-20231231.xsd#ScheduleIIValuationandQualifyingAccountsDetails"/>
  <link:definitionLink xlink:role="http://www.wynnresorts.com/role/ScheduleIIValuationandQualifyingAccountsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_bb02276a-8e99-4fb0-af30-f577a74e01c6" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ValuationAndQualifyingAccountsDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_ac5ab1e4-dd28-4d9f-bdd1-7412a2155ce5" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ValuationAndQualifyingAccountsDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_bb02276a-8e99-4fb0-af30-f577a74e01c6" xlink:to="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_ac5ab1e4-dd28-4d9f-bdd1-7412a2155ce5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_cad33d66-aac6-4d98-afd6-aa7c015e8c51" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowancesAndReservesTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_ac5ab1e4-dd28-4d9f-bdd1-7412a2155ce5" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_cad33d66-aac6-4d98-afd6-aa7c015e8c51" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_cad33d66-aac6-4d98-afd6-aa7c015e8c51_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowancesAndReservesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_cad33d66-aac6-4d98-afd6-aa7c015e8c51" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_cad33d66-aac6-4d98-afd6-aa7c015e8c51_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_a36a4e7f-81f8-43c0-9602-3c1ff83f68f5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowancesAndReservesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_cad33d66-aac6-4d98-afd6-aa7c015e8c51" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_a36a4e7f-81f8-43c0-9602-3c1ff83f68f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForCreditLossMember_a3e1f278-3536-4c3f-99e1-2ff0aed24707" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AllowanceForCreditLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_a36a4e7f-81f8-43c0-9602-3c1ff83f68f5" xlink:to="loc_us-gaap_AllowanceForCreditLossMember_a3e1f278-3536-4c3f-99e1-2ff0aed24707" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember_0af1346e-a9ef-4eb1-b084-0dedb495b354" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_a36a4e7f-81f8-43c0-9602-3c1ff83f68f5" xlink:to="loc_us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember_0af1346e-a9ef-4eb1-b084-0dedb495b354" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesBalance_fb22ca8f-4cf5-472b-854e-b59de593239e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowancesAndReservesBalance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_bb02276a-8e99-4fb0-af30-f577a74e01c6" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesBalance_fb22ca8f-4cf5-472b-854e-b59de593239e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_5d33bd42-ed44-4b28-991e-44189fe4f6bf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_bb02276a-8e99-4fb0-af30-f577a74e01c6" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_5d33bd42-ed44-4b28-991e-44189fe4f6bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesAdjustments_041afc75-4506-4676-9a99-6824a02a0855" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowancesAndReservesAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_bb02276a-8e99-4fb0-af30-f577a74e01c6" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesAdjustments_041afc75-4506-4676-9a99-6824a02a0855" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesBalance_3c87f9f6-a5d1-454e-a041-dd3b155671cf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowancesAndReservesBalance"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-roles-2023.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Investments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_Investments" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetImpairment" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillAndIntangibleAssetImpairment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract" xlink:to="loc_us-gaap_GoodwillAndIntangibleAssetImpairment" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract" xlink:to="loc_us-gaap_LongTermDebtNoncurrent" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherAccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrent" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/AwardTypeOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#AwardTypeOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/AwardTypeOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaap_PerformanceSharesMember" xlink:type="arc" order="4"/>
  </link:definitionLink>
</link:linkbase>
