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<!-- DFIN ActiveDisclosure(SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date      : 2022-05-05T05:09:23.1274514+00:00 -->
<!-- Version            : 5.0.1.747 -->
<!-- Package ID         : 1b794a2730c6470f9a4382352fc2a993 -->
<!-- Copyright (c) 2022 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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  <xsd:element id="ww_WorkshopsDigitalFeesMember" name="WorkshopsDigitalFeesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_SubscriptionRevenuesNetMember" name="SubscriptionRevenuesNetMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_ProductSalesAndOtherMember" name="ProductSalesAndOtherMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_NorthAmericaSegmentMember" name="NorthAmericaSegmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_EuropeSegmentMember" name="EuropeSegmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_GBSegmentMember" name="GBSegmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
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  <xsd:element id="ww_ContractWithCustomerAssetAndLiabilityLineItems" name="ContractWithCustomerAssetAndLiabilityLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
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  <xsd:element id="ww_BusinessAcquisitionCashHeldInReserves" name="BusinessAcquisitionCashHeldInReserves" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="ww_DenrossLimitedMember" name="DenrossLimitedMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_CheckweightLimitedMember" name="CheckweightLimitedMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_WeightWatchersOfMaineIncMember" name="WeightWatchersOfMaineIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_TheWWGroupIncMember" name="TheWWGroupIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_TheWWGroupCoMember" name="TheWWGroupCoMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssets" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="ww_InternalUseSoftwareContentAndWebsiteDevelopmentMember" name="InternalUseSoftwareContentAndWebsiteDevelopmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_TrademarksAndOtherIntangibleAssetsMember" name="TrademarksAndOtherIntangibleAssetsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_FiniteLivedIntangibleAssetsAmortizationExpenseYearFourAndThereafter" name="FiniteLivedIntangibleAssetsAmortizationExpenseYearFourAndThereafter" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="ww_TermLoanFacilityDueAprilThirteenTwoThousandTwentyEightMember" name="TermLoanFacilityDueAprilThirteenTwoThousandTwentyEightMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_SeniorSecuredNotesDueAprilFifteenTwoThousandTwentyNineMember" name="SeniorSecuredNotesDueAprilFifteenTwoThousandTwentyNineMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_WriteOffOfDeferredDebtIssuanceCostAndDebtDiscount" name="WriteOffOfDeferredDebtIssuanceCostAndDebtDiscount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="ww_DebtInstrumentsMaturityYear" name="DebtInstrumentsMaturityYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ww_SeniorSecuredTrancheBTermLoanMember" name="SeniorSecuredTrancheBTermLoanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_EightPointSixTwentyFivePercentSeniorNotesDueInTwoThousandTwentyFiveMember" name="EightPointSixTwentyFivePercentSeniorNotesDueInTwoThousandTwentyFiveMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_CreditFacilitiesMember" name="CreditFacilitiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_SeniorSecuredRevolvingCreditFacilityDueInTwoThousandTwentyTwoMember" name="SeniorSecuredRevolvingCreditFacilityDueInTwoThousandTwentyTwoMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_FourPointFiveZeroZeroPercentSeniorSecuredNotesDue2029Member" name="FourPointFiveZeroZeroPercentSeniorSecuredNotesDue2029Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_SeniorSecuredRevolvingCreditFacilityMember" name="SeniorSecuredRevolvingCreditFacilityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_TermLoanFacilityMember" name="TermLoanFacilityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_FederalFundsEffectiveRateMember" name="FederalFundsEffectiveRateMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_ChangeOfControlMember" name="ChangeOfControlMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_SaleOfAssetsMember" name="SaleOfAssetsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_CreditFacilitiesAndSeniorSecuredNotesMember" name="CreditFacilitiesAndSeniorSecuredNotesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_EstimatedExcessCashFlowPrepaymentOfferObligation" name="EstimatedExcessCashFlowPrepaymentOfferObligation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="ww_PercentageOfEquityInterestsPledged" name="PercentageOfEquityInterestsPledged" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ww_PledgePercentageOfFirstTierForeignSubsidiariesDirectlyOwnedByCompanyOrWhollyOwnedSubsidiaries" name="PledgePercentageOfFirstTierForeignSubsidiariesDirectlyOwnedByCompanyOrWhollyOwnedSubsidiaries" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ww_PercentageOfAnnualExcessCashFlow" name="PercentageOfAnnualExcessCashFlow" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ww_PercentageOfAnnualExcessCashFlowAfterAttainingFirstLienSecuredNetLeverageRatioOne" name="PercentageOfAnnualExcessCashFlowAfterAttainingFirstLienSecuredNetLeverageRatioOne" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ww_PercentageOfAnnualExcessCashFlowAfterAttainingFirstLienSecuredNetLeverageRatioTwo" name="PercentageOfAnnualExcessCashFlowAfterAttainingFirstLienSecuredNetLeverageRatioTwo" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ww_PercentageOfNetCashProceedsOfCertainNonOrdinaryCourseAssetSalesByCompanyAndItsRestrictedSubsidiaries" name="PercentageOfNetCashProceedsOfCertainNonOrdinaryCourseAssetSalesByCompanyAndItsRestrictedSubsidiaries" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ww_PercentageOfRightToReinvestOfNetCashProceedsOfCertainNonOrdinaryCourseAssetSalesByCompanyAndItsRestrictedSubsidiariesSubjectToCertainQualifications" name="PercentageOfRightToReinvestOfNetCashProceedsOfCertainNonOrdinaryCourseAssetSalesByCompanyAndItsRestrictedSubsidiariesSubjectToCertainQualifications" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ww_PercentageOfNetProceedsOfAnyIssuanceOrIncurrenceOfDebtByCompanyOrAnyOfItsRestrictedSubsidiaries" name="PercentageOfNetProceedsOfAnyIssuanceOrIncurrenceOfDebtByCompanyOrAnyOfItsRestrictedSubsidiaries" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ww_DebtInstrumentVariableRateFloorPercentDeterminedOptionOne" name="DebtInstrumentVariableRateFloorPercentDeterminedOptionOne" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ww_LineOfCreditMaximumOutstandingPercentageToConsolidatedFirstLienLeverageRatio" name="LineOfCreditMaximumOutstandingPercentageToConsolidatedFirstLienLeverageRatio" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ww_ConsolidatedFirstLienLeverageRatio" name="ConsolidatedFirstLienLeverageRatio" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ww_IncreaseDecreaseInConsolidatedFirstLienLeverageRatio" name="IncreaseDecreaseInConsolidatedFirstLienLeverageRatio" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ww_DebtInstrumentInterestPaymentDescription" name="DebtInstrumentInterestPaymentDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ww_DebtInstrumentPercentageOfPrincipalAmountThatMayBeRedeemedUtilizingNetCashProceedsFromCertainEquityOfferingsAndRequirements" name="DebtInstrumentPercentageOfPrincipalAmountThatMayBeRedeemedUtilizingNetCashProceedsFromCertainEquityOfferingsAndRequirements" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ww_TwoThousandEighteenSwapMember" name="TwoThousandEighteenSwapMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_TwoThousandNineteenSwapMember" name="TwoThousandNineteenSwapMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_CurrentSwapsMember" name="CurrentSwapsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_DerivativePayableMember" name="DerivativePayableMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_DerivativeEffectiveDateAndNotionalAmountDecreases" name="DerivativeEffectiveDateAndNotionalAmountDecreases" type="xbrli:dateItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ww_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectPretax" name="AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectPretax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="ww_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNextTwelveMonthsBeforeTax" name="InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNextTwelveMonthsBeforeTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="ww_InterestRateDerivativeCurrentAssetAtFairValue" name="InterestRateDerivativeCurrentAssetAtFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="ww_InterestRateDerivativeNoncurrentAssetAtFairValue" name="InterestRateDerivativeNoncurrentAssetAtFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="ww_OtherComprehensiveIncomeLossAfterReclassificationOfTaxEffectNetOfTax" name="OtherComprehensiveIncomeLossAfterReclassificationOfTaxEffectNetOfTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="ww_UncategorizedAbstract" name="UncategorizedAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTaxQualifyingAsInterestRateContract" name="OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTaxQualifyingAsInterestRateContract" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="ww_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTaxQualifyingAsInterestRateContract" name="OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTaxQualifyingAsInterestRateContract" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="ww_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTaxQualifyingAsInterestRateContract" name="OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTaxQualifyingAsInterestRateContract" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="ww_IncomeLossBeforeIncomeTaxesMember" name="IncomeLossBeforeIncomeTaxesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_ProvisionForBenefitFromIncomeTaxesMember" name="ProvisionForBenefitFromIncomeTaxesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_InitialTermOfAgreement" name="InitialTermOfAgreement" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ww_MsWinfreyAndOthersMember" name="MsWinfreyAndOthersMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_MsWinfreyMember" name="MsWinfreyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_EstimatedCostOfRestructuringCharges" name="EstimatedCostOfRestructuringCharges" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="ww_FiscalYearTwoThousandAndTwentyTwoPlanMember" name="FiscalYearTwoThousandAndTwentyTwoPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_LeaseTerminationCostsMember" name="LeaseTerminationCostsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_FiscalYearTwoThousandAndTwentyOnePlanMember" name="FiscalYearTwoThousandAndTwentyOnePlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_FiscalYearTwoThousandAndTwentyPlanMember" name="FiscalYearTwoThousandAndTwentyPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ww_RestructuringChargesAfterTax" name="RestructuringChargesAfterTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
</xsd:schema>
