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  <xs:element name="ConcentrationOfRiskNumberOfMajorCustomers" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_ConcentrationOfRiskNumberOfMajorCustomers"/>
  <xs:element name="NoteEDebtDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="naii_NoteEDebtDetailsTable"/>
  <xs:element name="NoteEDebtDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_NoteEDebtDetailsLineItems"/>
  <xs:element name="NetIncomeRequiredInFutureForIncomeCovenant" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="naii_NetIncomeRequiredInFutureForIncomeCovenant"/>
  <xs:element name="DebtInstrumentBasisSpreadOnElectedFixedRateBorrowing" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="naii_DebtInstrumentBasisSpreadOnElectedFixedRateBorrowing"/>
  <xs:element name="LineOfCreditFacilityOutstandingDailyBalanceDuringPeriod" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="naii_LineOfCreditFacilityOutstandingDailyBalanceDuringPeriod"/>
  <xs:element name="LineOfCreditCovenantNumberOfConsecutiveDaysThatOutstandingBalanceMustBeZero" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_LineOfCreditCovenantNumberOfConsecutiveDaysThatOutstandingBalanceMustBeZero"/>
  <xs:element name="MinimumPrepaymentAmountUnderLineOfCredit" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="naii_MinimumPrepaymentAmountUnderLineOfCredit"/>
  <xs:element name="LineOfCreditFacilityMaximumBorrowingCapacityAnnualReduction" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="naii_LineOfCreditFacilityMaximumBorrowingCapacityAnnualReduction"/>
  <xs:element name="LineOfCreditFacilityMaximumAmountOutstandingAfterReduction" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="naii_LineOfCreditFacilityMaximumAmountOutstandingAfterReduction"/>
  <xs:element name="DebtPrepaymentPenaltyRate" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_DebtPrepaymentPenaltyRate"/>
  <xs:element name="DebtPrePaymentPenalty" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="naii_DebtPrePaymentPenalty"/>
  <xs:element name="NoteFIncomeTaxesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="naii_NoteFIncomeTaxesDetailsTable"/>
  <xs:element name="NoteFIncomeTaxesDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_NoteFIncomeTaxesDetailsLineItems"/>
  <xs:element name="OperatingLossCarryforwardsExpirationYear" type="xbrli:gYearItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_OperatingLossCarryforwardsExpirationYear"/>
  <xs:element name="NetOperatingLossCarryforwardLimitationOnUsePercentageOwnershipChangeMinimum" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="naii_NetOperatingLossCarryforwardLimitationOnUsePercentageOwnershipChangeMinimum"/>
  <xs:element name="DefinedContributionPlansDisclosureDomain" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_DefinedContributionPlansDisclosureDomain"/>
  <xs:element name="NoteGEmployeeBenefitPlansDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="naii_NoteGEmployeeBenefitPlansDetailsTable"/>
  <xs:element name="NoteGEmployeeBenefitPlansDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_NoteGEmployeeBenefitPlansDetailsLineItems"/>
  <xs:element name="HealthInsurancePlanPremiumExpense" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="naii_HealthInsurancePlanPremiumExpense"/>
  <xs:element name="NumberOfYearsCompensationUsedForBenefitObligationAssumptions" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_NumberOfYearsCompensationUsedForBenefitObligationAssumptions"/>
  <xs:element name="DefinedBenefitPlanEquitySecuritiesByTypePercentage" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_DefinedBenefitPlanEquitySecuritiesByTypePercentage"/>
  <xs:element name="DefinedBenefitPlanDebtSecuritiesByTypePercentage" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_DefinedBenefitPlanDebtSecuritiesByTypePercentage"/>
  <xs:element name="NoteHStockholdersEquityDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="naii_NoteHStockholdersEquityDetailsTable"/>
  <xs:element name="NoteHStockholdersEquityDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_NoteHStockholdersEquityDetailsLineItems"/>
  <xs:element name="NoteICommitmentsDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="naii_NoteICommitmentsDetailsTable"/>
  <xs:element name="NoteICommitmentsDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_NoteICommitmentsDetailsLineItems"/>
  <xs:element name="OperatingLeaseFacilityArea" type="num:areaItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="naii_OperatingLeaseFacilityArea"/>
  <xs:element name="NoteJEconomicDependencyDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="naii_NoteJEconomicDependencyDetailsTable"/>
  <xs:element name="NoteJEconomicDependencyDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_NoteJEconomicDependencyDetailsLineItems"/>
  <xs:element name="NoteKDerivativesandHedgingDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="naii_NoteKDerivativesandHedgingDetailsTable"/>
  <xs:element name="NoteKDerivativesandHedgingDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_NoteKDerivativesandHedgingDetailsLineItems"/>
  <xs:element name="AccumulatedOtherComprehensiveIncomeLossCumulativeCashFlowHedgesGainLoss" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="naii_AccumulatedOtherComprehensiveIncomeLossCumulativeCashFlowHedgesGainLoss"/>
  <xs:element name="AccumulatedOtherComprehensiveIncomeLossCumulativeCashFlowHedgesGainLossTaxEffect" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="naii_AccumulatedOtherComprehensiveIncomeLossCumulativeCashFlowHedgesGainLossTaxEffect"/>
  <xs:element name="NumberOfPatentsInLawsuit" type="xbrli:decimalItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="naii_NumberOfPatentsInLawsuit"/>
  <xs:element name="NoteMSegmentInformationDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="naii_NoteMSegmentInformationDetailsTable"/>
  <xs:element name="NoteMSegmentInformationDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_NoteMSegmentInformationDetailsLineItems"/>
  <xs:element name="NoteNSubsequentEventsDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="naii_NoteNSubsequentEventsDetailsTable"/>
  <xs:element name="NoteNSubsequentEventsDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_NoteNSubsequentEventsDetailsLineItems"/>
  <xs:element name="DefinedContributionPlansDisclosureAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem" id="naii_DefinedContributionPlansDisclosureAxis"/>
  <xs:element name="AccruedLiabilities1Member" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_AccruedLiabilities1Member"/>
  <xs:element name="AmendedLineofCreditFacilityMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_AmendedLineofCreditFacilityMember"/>
  <xs:element name="AmendmentMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_AmendmentMember"/>
  <xs:element name="BrandedProductsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_BrandedProductsMember"/>
  <xs:element name="CSIMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_CSIMember"/>
  <xs:element name="CashFlowHedgingForeignExchangeContractMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_CashFlowHedgingForeignExchangeContractMember"/>
  <xs:element name="CurrentAccountLoansMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_CurrentAccountLoansMember"/>
  <xs:element name="Customer1Member" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_Customer1Member"/>
  <xs:element name="Customer2Member" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_Customer2Member"/>
  <xs:element name="Customer3Member" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_Customer3Member"/>
  <xs:element name="EmergingMarketEquityFundsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_EmergingMarketEquityFundsMember"/>
  <xs:element name="EstimatedMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_EstimatedMember"/>
  <xs:element name="ExcludingRestrictedStockPurchasedMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_ExcludingRestrictedStockPurchasedMember"/>
  <xs:element name="FirstContributionsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_FirstContributionsMember"/>
  <xs:element name="FixedLoansMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_FixedLoansMember"/>
  <xs:element name="HighYieldFixedIncomeFundsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_HighYieldFixedIncomeFundsMember"/>
  <xs:element name="IntermediateFixedIncomeFundsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_IntermediateFixedIncomeFundsMember"/>
  <xs:element name="InternationalEmergingMarketsFundsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_InternationalEmergingMarketsFundsMember"/>
  <xs:element name="InternationalEquityFundsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_InternationalEquityFundsMember"/>
  <xs:element name="LargecapFundsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_LargecapFundsMember"/>
  <xs:element name="MarketsOutsidetheUnitedStatesMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_MarketsOutsidetheUnitedStatesMember"/>
  <xs:element name="MidcapFundsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_MidcapFundsMember"/>
  <xs:element name="NaturalAlternativesInternationalEuropeSaMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_NaturalAlternativesInternationalEuropeSaMember"/>
  <xs:element name="NetSalesAndIncomeFromOperationsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_NetSalesAndIncomeFromOperationsMember"/>
  <xs:element name="NextContributionsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_NextContributionsMember"/>
  <xs:element name="OmnibusStockIncentivePlan1999Member" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_OmnibusStockIncentivePlan1999Member"/>
  <xs:element name="OmnibusStockIncentivePlan2009Member" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_OmnibusStockIncentivePlan2009Member"/>
  <xs:element name="OtherNoncurrentAssetsNetMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_OtherNoncurrentAssetsNetMember"/>
  <xs:element name="PatentandTrademarkLicensingMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_PatentandTrademarkLicensingMember"/>
  <xs:element name="PriorToAmendmentMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_PriorToAmendmentMember"/>
  <xs:element name="PrivateLabelContractManufacturingMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_PrivateLabelContractManufacturingMember"/>
  <xs:element name="REITAndMPLFundsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_REITAndMPLFundsMember"/>
  <xs:element name="ShorttermFixedIncomeFundsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_ShorttermFixedIncomeFundsMember"/>
  <xs:element name="TotalAssetsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_TotalAssetsMember"/>
  <xs:element name="installmentMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_installmentMember"/>
  <xs:element name="DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="naii_DocumentAndEntityInformationAbstract"/>
</xs:schema>
