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  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel"/>
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    <link:label id="lab_dei_EntityTaxIdentificationNumber_label_en-US" xlink:label="lab_dei_EntityTaxIdentificationNumber" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Tax Identification Number</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityTaxIdentificationNumber"/>
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    <link:label id="lab_srt_MaximumMember_label_en-US" xlink:label="lab_srt_MaximumMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_MaximumMember" xlink:to="lab_srt_MaximumMember" xlink:type="arc" order="1"/>
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    <link:label id="lab_dei_LegalEntityAxis_label_en-US" xlink:label="lab_dei_LegalEntityAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Legal Entity [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_LegalEntityAxis" xlink:to="lab_dei_LegalEntityAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_RangeMember_019e83d4-c630-7585-9226-c667ee54e965_terseLabel_en-US" xlink:label="lab_srt_RangeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Statistical Measurement [Domain]</link:label>
    <link:label id="lab_srt_RangeMember_label_en-US" xlink:label="lab_srt_RangeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statistical Measurement [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_RangeMember" xlink:to="lab_srt_RangeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable_019e83d4-c630-7f7b-a32b-51ba5b535c6c_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Description of Plan [Table]</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Description of Plan [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_MutualFundMember_019e83d4-c630-7ad8-ab1d-97dcc86fa38d_terseLabel_en-US" xlink:label="lab_us-gaap_MutualFundMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Registered investment company funds</link:label>
    <link:label id="lab_us-gaap_MutualFundMember_label_en-US" xlink:label="lab_us-gaap_MutualFundMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Mutual Fund [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MutualFundMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MutualFundMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MutualFundMember" xlink:to="lab_us-gaap_MutualFundMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_UnionMember_019e83d4-c630-7dd3-8b9a-837133260958_terseLabel_en-US" xlink:label="lab_cost_UnionMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Union</link:label>
    <link:label id="lab_cost_UnionMember_label_en-US" xlink:label="lab_cost_UnionMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Union [Member]</link:label>
    <link:label id="lab_cost_UnionMember_documentation_en-US" xlink:label="lab_cost_UnionMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Union</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_UnionMember" xlink:href="cost-20251231.xsd#cost_UnionMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_UnionMember" xlink:to="lab_cost_UnionMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable_019e83d4-c630-7417-ad3b-ee0436b2d421_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Related Party and Party-in-Interest Transactions [Table]</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Related Party and Party-in-Interest Transactions [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanParticipantContributionPretaxMaximumAnnualCompensationToTotalCompensationPercentage_019e83d4-c630-78a2-b7e2-b21bb0c80bf9_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanParticipantContributionPretaxMaximumAnnualCompensationToTotalCompensationPercentage" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanParticipantContributionPretaxMaximumAnnualCompensationToTotalCompensationPercentage_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanParticipantContributionPretaxMaximumAnnualCompensationToTotalCompensationPercentage" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantContributionPretaxMaximumAnnualCompensationToTotalCompensationPercentage" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanParticipantContributionPretaxMaximumAnnualCompensationToTotalCompensationPercentage"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantContributionPretaxMaximumAnnualCompensationToTotalCompensationPercentage" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanParticipantContributionPretaxMaximumAnnualCompensationToTotalCompensationPercentage" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractTable_019e83d4-c630-7338-8ffe-9734a6a4908f_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Fully Benefit-Responsive Investment Contract [Table]</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractTable_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Fully Benefit-Responsive Investment Contract [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractTable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractTable" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractTable" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EBPNoteReceivableFromParticipantAccountMaximumBorrowingReductionPeriodForHighestOutstandingLoanBalance_019e83d4-c630-75ce-9e0a-26c85375ea47_terseLabel_en-US" xlink:label="lab_cost_EBPNoteReceivableFromParticipantAccountMaximumBorrowingReductionPeriodForHighestOutstandingLoanBalance" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Note Receivable from Participant, Account, Maximum Borrowing, Reduction, Period for Highest Outstanding Loan Balance</link:label>
    <link:label id="lab_cost_EBPNoteReceivableFromParticipantAccountMaximumBorrowingReductionPeriodForHighestOutstandingLoanBalance_label_en-US" xlink:label="lab_cost_EBPNoteReceivableFromParticipantAccountMaximumBorrowingReductionPeriodForHighestOutstandingLoanBalance" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Note Receivable from Participant, Account, Maximum Borrowing, Reduction, Period for Highest Outstanding Loan Balance</link:label>
    <link:label id="lab_cost_EBPNoteReceivableFromParticipantAccountMaximumBorrowingReductionPeriodForHighestOutstandingLoanBalance_documentation_en-US" xlink:label="lab_cost_EBPNoteReceivableFromParticipantAccountMaximumBorrowingReductionPeriodForHighestOutstandingLoanBalance" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Period of highest outstanding loan balance for calculating the reduction of the maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EBPNoteReceivableFromParticipantAccountMaximumBorrowingReductionPeriodForHighestOutstandingLoanBalance" xlink:href="cost-20251231.xsd#cost_EBPNoteReceivableFromParticipantAccountMaximumBorrowingReductionPeriodForHighestOutstandingLoanBalance"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EBPNoteReceivableFromParticipantAccountMaximumBorrowingReductionPeriodForHighestOutstandingLoanBalance" xlink:to="lab_cost_EBPNoteReceivableFromParticipantAccountMaximumBorrowingReductionPeriodForHighestOutstandingLoanBalance" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingAmount_019e83d4-c630-7a6e-a01a-f609d5afbbc8_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingAmount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingAmount_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingAmount" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingAmount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingAmount" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingAmount" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTextBlock_019e83d4-c630-776b-90f7-19fafc0dd8fe_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Measurement</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTextBlock_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Investment, Fair Value and NAV [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTextBlock" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMinimumBorrowingAmount_019e83d4-c6e5-7da9-9b89-7c7facf2f06e_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMinimumBorrowingAmount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMinimumBorrowingAmount_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMinimumBorrowingAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMinimumBorrowingAmount" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMinimumBorrowingAmount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMinimumBorrowingAmount" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMinimumBorrowingAmount" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EBP002Member_019e83d4-c630-7b04-8d2a-dfb9d11c29d2_terseLabel_en-US" xlink:label="lab_cost_EBP002Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP002</link:label>
    <link:label id="lab_cost_EBP002Member_label_en-US" xlink:label="lab_cost_EBP002Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP002 [Member]</link:label>
    <link:label id="lab_cost_EBP002Member_documentation_en-US" xlink:label="lab_cost_EBP002Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">EBP002</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EBP002Member" xlink:href="cost-20251231.xsd#cost_EBP002Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EBP002Member" xlink:to="lab_cost_EBP002Member" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractAbstract_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Fully Benefit-Responsive Investment Contract [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractAbstract" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue_019e83d4-c630-7f98-b6a2-4fbac2653b8e_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investments at fair value</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueInputsLevel1Member_019e83d4-c630-72a9-b5d6-eaf789dbec67_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel1Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value, Inputs, Level 1</link:label>
    <link:label id="lab_us-gaap_FairValueInputsLevel1Member_label_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel1Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Inputs, Level 1 [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueInputsLevel1Member" xlink:to="lab_us-gaap_FairValueInputsLevel1Member" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractTextBlock_019e83d4-c630-7ad9-899b-f0f9b2fe5b53_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fully Benefit-Responsive Investment Contract</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractTextBlock_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Fully Benefit-Responsive Investment Contract [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractTextBlock" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavAbstract_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Investment, Fair Value and NAV [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavAbstract" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EBPNoteReceivableFromParticipantRepaymentMaximumPercentageOfParticipantsNetPay_019e83d4-c630-71e9-89ff-2ece84fca8cc_terseLabel_en-US" xlink:label="lab_cost_EBPNoteReceivableFromParticipantRepaymentMaximumPercentageOfParticipantsNetPay" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Note Receivable from Participant, Repayment, Maximum Percentage of Participants Net Pay</link:label>
    <link:label id="lab_cost_EBPNoteReceivableFromParticipantRepaymentMaximumPercentageOfParticipantsNetPay_label_en-US" xlink:label="lab_cost_EBPNoteReceivableFromParticipantRepaymentMaximumPercentageOfParticipantsNetPay" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Note Receivable from Participant, Repayment, Maximum Percentage of Participants Net Pay</link:label>
    <link:label id="lab_cost_EBPNoteReceivableFromParticipantRepaymentMaximumPercentageOfParticipantsNetPay_documentation_en-US" xlink:label="lab_cost_EBPNoteReceivableFromParticipantRepaymentMaximumPercentageOfParticipantsNetPay" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The maximum percentage of the participant's net pay for repayments of the not receivable from participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EBPNoteReceivableFromParticipantRepaymentMaximumPercentageOfParticipantsNetPay" xlink:href="cost-20251231.xsd#cost_EBPNoteReceivableFromParticipantRepaymentMaximumPercentageOfParticipantsNetPay"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EBPNoteReceivableFromParticipantRepaymentMaximumPercentageOfParticipantsNetPay" xlink:to="lab_cost_EBPNoteReceivableFromParticipantRepaymentMaximumPercentageOfParticipantsNetPay" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanAssetAbstract_019e83d4-c630-7ef3-8872-d947b5ea4e4d_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanAssetAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Assets:</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanAssetAbstract_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanAssetAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Asset [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAssetAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAssetAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAssetAbstract" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanAssetAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_RangeAxis_019e83d4-c630-7f66-8068-54909f22c313_terseLabel_en-US" xlink:label="lab_srt_RangeAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Statistical Measurement [Axis]</link:label>
    <link:label id="lab_srt_RangeAxis_label_en-US" xlink:label="lab_srt_RangeAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statistical Measurement [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_RangeAxis" xlink:to="lab_srt_RangeAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitTable_019e83d4-c630-7afd-b3c3-ef523f2d43f8_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Statement of Change in Net Asset Available for Benefit [Table]</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitTable_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Statement of Change in Net Asset Available for Benefit [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitTable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitTable" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanPaymentToParticipantPolicyTextBlock_019e83d4-c630-77d6-91cc-8f50d8dc401d_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanPaymentToParticipantPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Distribution of Benefits</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanPaymentToParticipantPolicyTextBlock_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanPaymentToParticipantPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Payment to Participant [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanPaymentToParticipantPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanPaymentToParticipantPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanPaymentToParticipantPolicyTextBlock" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanPaymentToParticipantPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_NonUnionMember_019e83d4-c630-7595-8e09-ecb47952cc0a_terseLabel_en-US" xlink:label="lab_cost_NonUnionMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-Union</link:label>
    <link:label id="lab_cost_NonUnionMember_label_en-US" xlink:label="lab_cost_NonUnionMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-Union [Member]</link:label>
    <link:label id="lab_cost_NonUnionMember_documentation_en-US" xlink:label="lab_cost_NonUnionMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Non-Union</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_NonUnionMember" xlink:href="cost-20251231.xsd#cost_NonUnionMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_NonUnionMember" xlink:to="lab_cost_NonUnionMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_AmendmentFlag_019e83d4-c630-7798-b225-acd153bcfc29_terseLabel_en-US" xlink:label="lab_dei_AmendmentFlag" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amendment Flag</link:label>
    <link:label id="lab_dei_AmendmentFlag_label_en-US" xlink:label="lab_dei_AmendmentFlag" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amendment Flag</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AmendmentFlag"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AmendmentFlag" xlink:to="lab_dei_AmendmentFlag" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContribution_019e83d4-c630-7ac1-901e-200f2f841774_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContribution" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Employee</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContribution_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContribution" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContribution" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContribution"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContribution" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContribution" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanBasisOfAccountingPolicyTextBlock_019e83d4-c630-795f-8c6b-22817a69829a_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanBasisOfAccountingPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basis of Accounting</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanBasisOfAccountingPolicyTextBlock_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanBasisOfAccountingPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Basis of Accounting [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanBasisOfAccountingPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanBasisOfAccountingPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanBasisOfAccountingPolicyTextBlock" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanBasisOfAccountingPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019e83d4-c630-7937-a67a-3d478f85605a_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Schedule of Asset Held for Investment [Table]</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Schedule of Asset Held for Investment [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfShares_019e83d4-c630-77a3-b4bd-9c19ada54819_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfShares" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of shares held by the Plan</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfShares_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Investment, Number of Shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfShares" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfShares" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfShares" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanAbstract_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Description of Plan and Accounting Change [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanAbstract" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanReceivableAbstract_019e83d4-c630-7e9d-9308-0ddaeee12100_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanReceivableAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Receivables:</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanReceivableAbstract_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanReceivableAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Receivable [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanReceivableAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanReceivableAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReceivableAbstract" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanReceivableAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTableTextBlock_019e83d4-c630-7f26-b21a-6b3f6acc84d8_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Investment, Fair Value and NAV</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTableTextBlock_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Investment, Fair Value and NAV [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTableTextBlock" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InvestmentTypeCategorizationMember_019e83d4-c630-7fff-8e76-f90690950c2f_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentTypeCategorizationMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investments [Domain]</link:label>
    <link:label id="lab_us-gaap_InvestmentTypeCategorizationMember_label_en-US" xlink:label="lab_us-gaap_InvestmentTypeCategorizationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investments [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember" xlink:to="lab_us-gaap_InvestmentTypeCategorizationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanUseOfEstimatePolicyTextBlock_019e83d4-c630-77f2-a801-e5459d4f3726_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanUseOfEstimatePolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Use of Estimates</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanUseOfEstimatePolicyTextBlock_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanUseOfEstimatePolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Use of Estimate [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanUseOfEstimatePolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanUseOfEstimatePolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanUseOfEstimatePolicyTextBlock" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanUseOfEstimatePolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTableTextBlock_019e83d4-c630-781e-bf1a-bc0e7da4a14e_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Schedule of Asset Held for Investment</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTableTextBlock_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Schedule of Asset Held for Investment [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTableTextBlock" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_CoverAbstract_019e83d4-c630-789b-ade6-5ee70cb13818_terseLabel_en-US" xlink:label="lab_dei_CoverAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cover [Abstract]</link:label>
    <link:label id="lab_dei_CoverAbstract_label_en-US" xlink:label="lab_dei_CoverAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cover [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CoverAbstract" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CoverAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_CoverAbstract" xlink:to="lab_dei_CoverAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanRiskAndUncertaintyTextBlock_019e83d4-c630-7e88-89d5-e7d61a20e413_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanRiskAndUncertaintyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Risk and Uncertainty</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanRiskAndUncertaintyTextBlock_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanRiskAndUncertaintyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Risk and Uncertainty [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRiskAndUncertaintyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanRiskAndUncertaintyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRiskAndUncertaintyTextBlock" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanRiskAndUncertaintyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash_019e83d4-c630-782b-a794-efea4893cb73_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Employer</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfSharesPurchased_019e83d4-c6e5-7df9-8309-568d258d2b59_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfSharesPurchased" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of shares purchased by the Plan</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfSharesPurchased_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfSharesPurchased" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Investment, Purchased, Number of Shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfSharesPurchased" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfSharesPurchased"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfSharesPurchased" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfSharesPurchased" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanSyntheticInvestmentContractMember_019e83d4-c630-762f-b26b-31b8ca2ad6fe_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanSyntheticInvestmentContractMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Synthetic Investment Contract</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanSyntheticInvestmentContractMember_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanSyntheticInvestmentContractMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Synthetic Investment Contract [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanSyntheticInvestmentContractMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanSyntheticInvestmentContractMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanSyntheticInvestmentContractMember" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanSyntheticInvestmentContractMember" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_MinimumMember_019e83d4-c630-7ce3-998c-718692c54ab5_terseLabel_en-US" xlink:label="lab_srt_MinimumMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Minimum</link:label>
    <link:label id="lab_srt_MinimumMember_label_en-US" xlink:label="lab_srt_MinimumMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Minimum [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_MinimumMember" xlink:to="lab_srt_MinimumMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentValuationTechniqueExtensibleEnumeration_019e83d4-c630-7e09-a9b6-b88be2150dfe_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentValuationTechniqueExtensibleEnumeration" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Investment, Valuation Technique [Extensible Enumeration]</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentValuationTechniqueExtensibleEnumeration_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentValuationTechniqueExtensibleEnumeration" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Investment, Valuation Technique [Extensible Enumeration]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentValuationTechniqueExtensibleEnumeration" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentValuationTechniqueExtensibleEnumeration"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentValuationTechniqueExtensibleEnumeration" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentValuationTechniqueExtensibleEnumeration" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InvestmentTypeAxis_019e83d4-c630-7e05-b021-d00c9223ba8c_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentTypeAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investment Type [Axis]</link:label>
    <link:label id="lab_us-gaap_InvestmentTypeAxis_label_en-US" xlink:label="lab_us-gaap_InvestmentTypeAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investment Type [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentTypeAxis" xlink:to="lab_us-gaap_InvestmentTypeAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EmployeeBenefitPlanParticipantContributionPretaxMinimumAnnualCompensationToTotalCompensationPercentage_019e83d4-c6e5-7789-bd72-502b9550c00c_terseLabel_en-US" xlink:label="lab_cost_EmployeeBenefitPlanParticipantContributionPretaxMinimumAnnualCompensationToTotalCompensationPercentage" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Participant Contribution, Pretax, Minimum Annual Compensation to Total Compensation, Percentage</link:label>
    <link:label id="lab_cost_EmployeeBenefitPlanParticipantContributionPretaxMinimumAnnualCompensationToTotalCompensationPercentage_label_en-US" xlink:label="lab_cost_EmployeeBenefitPlanParticipantContributionPretaxMinimumAnnualCompensationToTotalCompensationPercentage" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Benefit Plan, Participant Contribution, Pretax, Minimum Annual Compensation to Total Compensation, Percentage</link:label>
    <link:label id="lab_cost_EmployeeBenefitPlanParticipantContributionPretaxMinimumAnnualCompensationToTotalCompensationPercentage_documentation_en-US" xlink:label="lab_cost_EmployeeBenefitPlanParticipantContributionPretaxMinimumAnnualCompensationToTotalCompensationPercentage" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of minimum pretax annual compensation that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), is permitted to contribute to total pretax annual compensation.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EmployeeBenefitPlanParticipantContributionPretaxMinimumAnnualCompensationToTotalCompensationPercentage" xlink:href="cost-20251231.xsd#cost_EmployeeBenefitPlanParticipantContributionPretaxMinimumAnnualCompensationToTotalCompensationPercentage"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EmployeeBenefitPlanParticipantContributionPretaxMinimumAnnualCompensationToTotalCompensationPercentage" xlink:to="lab_cost_EmployeeBenefitPlanParticipantContributionPretaxMinimumAnnualCompensationToTotalCompensationPercentage" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnNoteReceivableFromParticipant_019e83d4-c630-7f36-9bde-45c0a8a55c4f_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnNoteReceivableFromParticipant" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest on notes receivable from participants</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnNoteReceivableFromParticipant_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnNoteReceivableFromParticipant" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnNoteReceivableFromParticipant" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnNoteReceivableFromParticipant"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnNoteReceivableFromParticipant" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnNoteReceivableFromParticipant" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContribution_019e83d4-c630-73ed-b5a2-9805d9ea7ca2_totalLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContribution" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total contributions</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContribution_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContribution" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Change in Net Asset Available for Benefit, Increase from Contribution</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContribution" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContribution"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContribution" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContribution" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestment_019e83d4-c630-744f-95b7-6e051d96375b_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net appreciation of investments</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestment_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestment" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestment" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestment" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e83d4-c6e5-7024-9abc-dfe47318d7f8_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Description of Plan [Line Items]</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Description of Plan [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanPlanNumber_019e83d4-c630-7098-8c45-262239be3e44_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanPlanNumber" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Plan Number</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanPlanNumber_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanPlanNumber" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Plan Number</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanPlanNumber" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanPlanNumber"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanPlanNumber" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanPlanNumber" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e83d4-c630-73c2-ba4b-72937bdd286c_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Investment, Fair Value and NAV [Line Items]</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Investment, Fair Value and NAV [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTextBlock_019e83d4-c630-77c1-82bb-f94f9a0412d2_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Plan Description</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTextBlock_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Description of Plan [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTextBlock" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentIssuerNameExtensibleEnumeration_019e83d4-c6e5-7d8a-8ce5-f40c9c9ae895_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentIssuerNameExtensibleEnumeration" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Investment, Issuer Name [Extensible Enumeration]</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentIssuerNameExtensibleEnumeration_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentIssuerNameExtensibleEnumeration" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Investment, Issuer Name [Extensible Enumeration]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentIssuerNameExtensibleEnumeration" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentIssuerNameExtensibleEnumeration"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentIssuerNameExtensibleEnumeration" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentIssuerNameExtensibleEnumeration" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019e83d4-c630-775d-9d5b-b39f1adce42e_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Statement of Change in Net Asset Available for Benefit [Line Items]</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Statement of Change in Net Asset Available for Benefit [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitTable_019e83d4-c630-7de9-b35b-a58f9bba8605_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Statement of Net Asset Available for Benefit [Table]</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitTable_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Statement of Net Asset Available for Benefit [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitTable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitTable" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e83d4-c630-7d1a-9305-d543d50b886f_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Schedule of Asset Held for Investment [Line Items]</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Schedule of Asset Held for Investment [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnInvestment_019e83d4-c630-7334-a33c-8f25185c6a61_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnInvestment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnInvestment_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnInvestment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Investment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnInvestment" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnInvestment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnInvestment" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnInvestment" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanTaxDeterminationLetterDate_019e83d4-c630-7eb4-9729-45845300d711_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanTaxDeterminationLetterDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Tax determination letter, date</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanTaxDeterminationLetterDate_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanTaxDeterminationLetterDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Tax Determination Letter, Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanTaxDeterminationLetterDate" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanTaxDeterminationLetterDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanTaxDeterminationLetterDate" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanTaxDeterminationLetterDate" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember_019e83d4-c6e5-7521-9611-c0b737c6e23b_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Costco Wholesale Corporation common stock</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Employer, Common Stock [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentAbstract_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Schedule of Asset Held for Investment [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentAbstract" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable_019e83d4-c630-7a1e-b35c-4366b8bf2751_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Accounting Policy [Table]</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Accounting Policy [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EBPDiscretionaryContributionMaximumStraightTimeHoursPerYear_019e83d4-c6e5-7653-8a24-592409659bed_terseLabel_en-US" xlink:label="lab_cost_EBPDiscretionaryContributionMaximumStraightTimeHoursPerYear" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Discretionary Contribution Maximum Straight-Time Hours Per Year</link:label>
    <link:label id="lab_cost_EBPDiscretionaryContributionMaximumStraightTimeHoursPerYear_label_en-US" xlink:label="lab_cost_EBPDiscretionaryContributionMaximumStraightTimeHoursPerYear" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Discretionary Contribution Maximum Straight-time Hours Per Year</link:label>
    <link:label id="lab_cost_EBPDiscretionaryContributionMaximumStraightTimeHoursPerYear_documentation_en-US" xlink:label="lab_cost_EBPDiscretionaryContributionMaximumStraightTimeHoursPerYear" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The maximum straight-time hours per year of the discretionary contribution under the employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EBPDiscretionaryContributionMaximumStraightTimeHoursPerYear" xlink:href="cost-20251231.xsd#cost_EBPDiscretionaryContributionMaximumStraightTimeHoursPerYear"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EBPDiscretionaryContributionMaximumStraightTimeHoursPerYear" xlink:to="lab_cost_EBPDiscretionaryContributionMaximumStraightTimeHoursPerYear" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestmentAbstract_019e83d4-c630-7fec-917d-5f518ccfea28_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestmentAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net investment income</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestmentAbstract_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestmentAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestmentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestmentAbstract"/>
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    <link:label id="lab_us-gaap_InvestmentIdentifierAxis_019e83d4-c630-758a-b2b8-e9ab42b7ad55_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentIdentifierAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investment, Identifier [Axis]</link:label>
    <link:label id="lab_us-gaap_InvestmentIdentifierAxis_label_en-US" xlink:label="lab_us-gaap_InvestmentIdentifierAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investment, Identifier [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIdentifierAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIdentifierAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentIdentifierAxis" xlink:to="lab_us-gaap_InvestmentIdentifierAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestment_019e83d4-c630-75c5-be72-c78e53c2c1f2_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Asset Held for Investment</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestment_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Asset Held for Investment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestment" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestment" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestment" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustParticipationStatusExtensibleEnumeration_019e83d4-c630-7c14-a21b-baf39c9091cf_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustParticipationStatusExtensibleEnumeration" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration]</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustParticipationStatusExtensibleEnumeration_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustParticipationStatusExtensibleEnumeration" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustParticipationStatusExtensibleEnumeration" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustParticipationStatusExtensibleEnumeration"/>
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    <link:label id="lab_us-gaap-ebp_EbpRiskAndUncertaintyLineItems_019e83d4-c6e5-7536-b262-7c542ada54fd_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EbpRiskAndUncertaintyLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Risk and Uncertainty [Line Items]</link:label>
    <link:label id="lab_us-gaap-ebp_EbpRiskAndUncertaintyLineItems_label_en-US" xlink:label="lab_us-gaap-ebp_EbpRiskAndUncertaintyLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Risk and Uncertainty [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EbpRiskAndUncertaintyLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EbpRiskAndUncertaintyLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EbpRiskAndUncertaintyLineItems" xlink:to="lab_us-gaap-ebp_EbpRiskAndUncertaintyLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EbpRiskAndUncertaintyTable_019e83d4-c630-78fa-9d7d-dd6f1f5e10f9_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EbpRiskAndUncertaintyTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Risk and Uncertainty [Table]</link:label>
    <link:label id="lab_us-gaap-ebp_EbpRiskAndUncertaintyTable_label_en-US" xlink:label="lab_us-gaap-ebp_EbpRiskAndUncertaintyTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Risk and Uncertainty [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EbpRiskAndUncertaintyTable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EbpRiskAndUncertaintyTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EbpRiskAndUncertaintyTable" xlink:to="lab_us-gaap-ebp_EbpRiskAndUncertaintyTable" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_SeparatelyManagedAccountsMember_019e83d4-c630-7c11-b6fd-0be4350b61cd_terseLabel_en-US" xlink:label="lab_cost_SeparatelyManagedAccountsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Separately managed accounts</link:label>
    <link:label id="lab_cost_SeparatelyManagedAccountsMember_label_en-US" xlink:label="lab_cost_SeparatelyManagedAccountsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Separately Managed Accounts [Member]</link:label>
    <link:label id="lab_cost_SeparatelyManagedAccountsMember_documentation_en-US" xlink:label="lab_cost_SeparatelyManagedAccountsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Separately Managed Accounts</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_SeparatelyManagedAccountsMember" xlink:href="cost-20251231.xsd#cost_SeparatelyManagedAccountsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_SeparatelyManagedAccountsMember" xlink:to="lab_cost_SeparatelyManagedAccountsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitAbstract_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Statement of Change in Net Asset Available for Benefit [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitAbstract" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfSharesSold_019e83d4-c630-7abe-ad0a-2b6c78cfe144_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfSharesSold" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of shares sold by the Plan</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfSharesSold_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfSharesSold" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Investment, Sold, Number of Shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfSharesSold" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfSharesSold"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfSharesSold" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfSharesSold" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanTaxDeterminationLetterObtained_019e83d4-c630-7da7-881e-065ba6958049_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanTaxDeterminationLetterObtained" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Tax determination letter, obtained</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanTaxDeterminationLetterObtained_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanTaxDeterminationLetterObtained" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Tax Determination Letter, Obtained [true false]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanTaxDeterminationLetterObtained" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanTaxDeterminationLetterObtained"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanTaxDeterminationLetterObtained" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanTaxDeterminationLetterObtained" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EBPNoteReceivableFromParticipantTerm_019e83d4-c630-71ff-88f1-8b721eb4067e_terseLabel_en-US" xlink:label="lab_cost_EBPNoteReceivableFromParticipantTerm" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Note Receivable from Participant, Term</link:label>
    <link:label id="lab_cost_EBPNoteReceivableFromParticipantTerm_label_en-US" xlink:label="lab_cost_EBPNoteReceivableFromParticipantTerm" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Note Receivable from Participant, Term</link:label>
    <link:label id="lab_cost_EBPNoteReceivableFromParticipantTerm_documentation_en-US" xlink:label="lab_cost_EBPNoteReceivableFromParticipantTerm" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Period for term on note receivable from participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EBPNoteReceivableFromParticipantTerm" xlink:href="cost-20251231.xsd#cost_EBPNoteReceivableFromParticipantTerm"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EBPNoteReceivableFromParticipantTerm" xlink:to="lab_cost_EBPNoteReceivableFromParticipantTerm" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EBPEmployerMatchingContributionMaximumAnnualAmount_019e83d4-c630-7d6e-9643-86573f87a7f9_terseLabel_en-US" xlink:label="lab_cost_EBPEmployerMatchingContributionMaximumAnnualAmount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Employer Matching Contribution Maximum Annual Amount</link:label>
    <link:label id="lab_cost_EBPEmployerMatchingContributionMaximumAnnualAmount_label_en-US" xlink:label="lab_cost_EBPEmployerMatchingContributionMaximumAnnualAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Employer Matching Contribution Maximum Annual Amount</link:label>
    <link:label id="lab_cost_EBPEmployerMatchingContributionMaximumAnnualAmount_documentation_en-US" xlink:label="lab_cost_EBPEmployerMatchingContributionMaximumAnnualAmount" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The maximum annual amount of the employer match in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EBPEmployerMatchingContributionMaximumAnnualAmount" xlink:href="cost-20251231.xsd#cost_EBPEmployerMatchingContributionMaximumAnnualAmount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EBPEmployerMatchingContributionMaximumAnnualAmount" xlink:to="lab_cost_EBPEmployerMatchingContributionMaximumAnnualAmount" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractLineItems_019e83d4-c6e5-729b-bf3e-6d45d66bb9e5_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Fully Benefit-Responsive Investment Contract [Line Items]</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractLineItems_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Fully Benefit-Responsive Investment Contract [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractLineItems" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTable_019e83d4-c630-79ee-a27a-221e0290589c_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Tax Status [Table]</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTable_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Tax Status [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanTaxStatusTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTable" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecrease_019e83d4-c6e5-7a3f-b7ca-5ff346697373_totalLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecrease" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Increase in net assets</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecrease_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecrease" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Change in Net Asset Available for Benefit, Increase (Decrease)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecrease" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecrease"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecrease" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecrease" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTextBlock_019e83d4-c630-7a9a-90af-2cd349f6fb1b_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Party-in-Interest and Related Party Transactions</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTextBlock_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Related Party and Party-in-Interest Transactions [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTextBlock" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsAbstract_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Related Party and Party-in-Interest Transactions [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsAbstract" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyAbstract_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyAbstract" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanReceivable_019e83d4-c630-774b-8754-b0bf8d3546e2_totalLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanReceivable" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total receivables</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanReceivable_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanReceivable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Receivable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanReceivable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanReceivable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReceivable" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanReceivable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_TextBlockAbstract_label_en-US" xlink:label="lab_us-gaap_TextBlockAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Text Block [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TextBlockAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TextBlockAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TextBlockAbstract" xlink:to="lab_us-gaap_TextBlockAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionReceivable_019e83d4-c630-7feb-bdfc-7b421da4ed15_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionReceivable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Employer contributions</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionReceivable_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionReceivable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Employer Contribution, Receivable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionReceivable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerContributionReceivable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionReceivable" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionReceivable" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EBPEmployerContributionRequisiteServicePeriod_019e83d4-c630-75fc-9457-6cfb50a43589_terseLabel_en-US" xlink:label="lab_cost_EBPEmployerContributionRequisiteServicePeriod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Employer Contribution, Requisite Service Period</link:label>
    <link:label id="lab_cost_EBPEmployerContributionRequisiteServicePeriod_label_en-US" xlink:label="lab_cost_EBPEmployerContributionRequisiteServicePeriod" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Employer Contribution, Requisite Service Period</link:label>
    <link:label id="lab_cost_EBPEmployerContributionRequisiteServicePeriod_documentation_en-US" xlink:label="lab_cost_EBPEmployerContributionRequisiteServicePeriod" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Period of service of the employee required for employer to makes contributions in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EBPEmployerContributionRequisiteServicePeriod" xlink:href="cost-20251231.xsd#cost_EBPEmployerContributionRequisiteServicePeriod"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EBPEmployerContributionRequisiteServicePeriod" xlink:to="lab_cost_EBPEmployerContributionRequisiteServicePeriod" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanParticipantContributionAutomaticDeferralRate_019e83d4-c630-7711-a599-21f0b1797358_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanParticipantContributionAutomaticDeferralRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Participant Contribution, Automatic, Deferral Rate</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanParticipantContributionAutomaticDeferralRate_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanParticipantContributionAutomaticDeferralRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Participant Contribution, Automatic, Deferral Rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantContributionAutomaticDeferralRate" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanParticipantContributionAutomaticDeferralRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantContributionAutomaticDeferralRate" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanParticipantContributionAutomaticDeferralRate" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForPaymentToParticipant_019e83d4-c630-792a-bc53-962fa9f68737_negatedLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForPaymentToParticipant" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Distributions to participants and other</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForPaymentToParticipant_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForPaymentToParticipant" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForPaymentToParticipant" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForPaymentToParticipant"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForPaymentToParticipant" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForPaymentToParticipant" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForDividendIncomeOnInvestment_019e83d4-c630-70cf-8193-e1e6378faca0_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForDividendIncomeOnInvestment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Dividends</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForDividendIncomeOnInvestment_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForDividendIncomeOnInvestment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForDividendIncomeOnInvestment" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForDividendIncomeOnInvestment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForDividendIncomeOnInvestment" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForDividendIncomeOnInvestment" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustCurrentValue_019e83d4-c630-7cc4-8706-b5c23beec102_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustCurrentValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustCurrentValue_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustCurrentValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustCurrentValue" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustCurrentValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustCurrentValue" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustCurrentValue" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e83d4-c630-7aca-8897-caf95ab67d90_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Hierarchy and NAV [Domain]</link:label>
    <link:label id="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Hierarchy and NAV [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:to="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitAbstract_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Statement of Net Asset Available for Benefit [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitAbstract" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentTypeExtensibleEnumeration_019e83d4-c630-70a3-a635-4d9ca2d74923_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentTypeExtensibleEnumeration" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Investment, Current Value, Type [Extensible Enumeration]</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentTypeExtensibleEnumeration_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentTypeExtensibleEnumeration" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Investment, Current Value, Type [Extensible Enumeration]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentTypeExtensibleEnumeration" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentTypeExtensibleEnumeration"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentTypeExtensibleEnumeration" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentTypeExtensibleEnumeration" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e83d4-c630-705d-9abd-598a0a3ad04c_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Accounting Policy [Line Items]</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Accounting Policy [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentContractValueAbstract_019e83d4-c630-7247-92e0-80917a096d24_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentContractValueAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investments at contract value:</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentContractValueAbstract_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentContractValueAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Investment, Contract Value [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentContractValueAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentContractValueAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentContractValueAbstract" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentContractValueAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanTaxStatusAbstract_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanTaxStatusAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Tax Status [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanTaxStatusAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusAbstract" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanTaxStatusAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentPeriodEndDate_019e83d4-c630-7712-9a65-5317bf00bfcb_terseLabel_en-US" xlink:label="lab_dei_DocumentPeriodEndDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Period End Date</link:label>
    <link:label id="lab_dei_DocumentPeriodEndDate_label_en-US" xlink:label="lab_dei_DocumentPeriodEndDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Period End Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentPeriodEndDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentPeriodEndDate" xlink:to="lab_dei_DocumentPeriodEndDate" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanCash_019e83d4-c630-72e0-af09-61cce9a2c80b_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanCash" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-interest bearing cash</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanCash_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanCash" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Noninterest-Bearing Cash</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanCash" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanCash"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanCash" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanCash" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentPolicyTextBlock_019e83d4-c630-7ee5-b189-fd16f086daa0_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investment Valuation and Income Recognition</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentPolicyTextBlock_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Investment [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentPolicyTextBlock" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentPartyInInterest_019e83d4-c630-76bf-b75b-4dedd69efcc6_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentPartyInInterest" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Asset Held for Investment, Party-in-Interest [true false]</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentPartyInInterest_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentPartyInInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Asset Held for Investment, Party-in-Interest [true false]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentPartyInInterest" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentPartyInInterest"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentPartyInInterest" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentPartyInInterest" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentType_019e83d4-c630-72f1-b76e-2a4c4b587afb_terseLabel_en-US" xlink:label="lab_dei_DocumentType" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Type</link:label>
    <link:label id="lab_dei_DocumentType_label_en-US" xlink:label="lab_dei_DocumentType" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Type</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentType"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentType" xlink:to="lab_dei_DocumentType" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanPlanTerminationTextBlock_019e83d4-c630-75b8-a3d4-26a7ea5c856b_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanPlanTerminationTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Plan Termination</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanPlanTerminationTextBlock_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanPlanTerminationTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Plan Termination [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanPlanTerminationTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanPlanTerminationTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanPlanTerminationTextBlock" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanPlanTerminationTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityCentralIndexKey_019e83d4-c630-7fb6-bb10-811bad9a1832_terseLabel_en-US" xlink:label="lab_dei_EntityCentralIndexKey" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Central Index Key</link:label>
    <link:label id="lab_dei_EntityCentralIndexKey_label_en-US" xlink:label="lab_dei_EntityCentralIndexKey" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Central Index Key</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCentralIndexKey"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCentralIndexKey" xlink:to="lab_dei_EntityCentralIndexKey" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate_019e83d4-c630-7b15-a263-888bed5139bf_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Asset Held for Investment, Participant Loan, Interest Rate</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Asset Held for Investment, Participant Loan, Interest Rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EmployeeBenefitPlanParticipantContributionAutomaticIncreaseDeferralRate_019e83d4-c630-7791-ac92-c6cdc10205b1_terseLabel_en-US" xlink:label="lab_cost_EmployeeBenefitPlanParticipantContributionAutomaticIncreaseDeferralRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Participant Contribution, Automatic Increase, Deferral Rate</link:label>
    <link:label id="lab_cost_EmployeeBenefitPlanParticipantContributionAutomaticIncreaseDeferralRate_label_en-US" xlink:label="lab_cost_EmployeeBenefitPlanParticipantContributionAutomaticIncreaseDeferralRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Benefit Plan, Participant Contribution, Automatic Increase, Deferral Rate</link:label>
    <link:label id="lab_cost_EmployeeBenefitPlanParticipantContributionAutomaticIncreaseDeferralRate_documentation_en-US" xlink:label="lab_cost_EmployeeBenefitPlanParticipantContributionAutomaticIncreaseDeferralRate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of increase in eligible compensation contributed for participant automatically enrolled in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EmployeeBenefitPlanParticipantContributionAutomaticIncreaseDeferralRate" xlink:href="cost-20251231.xsd#cost_EmployeeBenefitPlanParticipantContributionAutomaticIncreaseDeferralRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EmployeeBenefitPlanParticipantContributionAutomaticIncreaseDeferralRate" xlink:to="lab_cost_EmployeeBenefitPlanParticipantContributionAutomaticIncreaseDeferralRate" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember_019e83d4-c6e5-7dcf-99b0-1a3668c04f98_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common commingled trust funds</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Collective Trust [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember" xlink:to="lab_us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EmployeeTypeAxis_019e83d4-c6e5-7870-86d0-cd74cb4f812d_terseLabel_en-US" xlink:label="lab_cost_EmployeeTypeAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Employee Type [Axis]</link:label>
    <link:label id="lab_cost_EmployeeTypeAxis_label_en-US" xlink:label="lab_cost_EmployeeTypeAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Type [Axis]</link:label>
    <link:label id="lab_cost_EmployeeTypeAxis_documentation_en-US" xlink:label="lab_cost_EmployeeTypeAxis" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Employee Type</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EmployeeTypeAxis" xlink:href="cost-20251231.xsd#cost_EmployeeTypeAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EmployeeTypeAxis" xlink:to="lab_cost_EmployeeTypeAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EbpRiskAndUncertaintyAbstract_label_en-US" xlink:label="lab_us-gaap-ebp_EbpRiskAndUncertaintyAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Risk and Uncertainty [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EbpRiskAndUncertaintyAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EbpRiskAndUncertaintyAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EbpRiskAndUncertaintyAbstract" xlink:to="lab_us-gaap-ebp_EbpRiskAndUncertaintyAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanTaxStatusLineItems_019e83d4-c630-7ec9-a973-9440117194bb_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanTaxStatusLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Tax Status [Line Items]</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanTaxStatusLineItems_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanTaxStatusLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Tax Status [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanTaxStatusLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusLineItems" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanTaxStatusLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipant_019e83d4-c630-77ea-af5b-69e5592552f4_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipant" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Notes receivable from participants</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipant_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipant" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Note Receivable from Participant</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipant" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipant"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipant" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipant" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e83d4-c630-794f-8ab0-400b63f241a0_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Hierarchy and NAV [Axis]</link:label>
    <link:label id="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_label_en-US" xlink:label="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Hierarchy and NAV [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:to="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanSummaryOfAccountingPolicyTextBlock_019e83d4-c630-7b0f-bacb-7056563cba94_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanSummaryOfAccountingPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of Significant Accounting Policies</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanSummaryOfAccountingPolicyTextBlock_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanSummaryOfAccountingPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Summary of Accounting Policy [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanSummaryOfAccountingPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanSummaryOfAccountingPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanSummaryOfAccountingPolicyTextBlock" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanSummaryOfAccountingPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityRegistrantName_019e83d4-c630-756f-8cf7-b6f0201e0902_terseLabel_en-US" xlink:label="lab_dei_EntityRegistrantName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Registrant Name</link:label>
    <link:label id="lab_dei_EntityRegistrantName_label_en-US" xlink:label="lab_dei_EntityRegistrantName" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Registrant Name</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityRegistrantName"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityRegistrantName" xlink:to="lab_dei_EntityRegistrantName" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EbpRiskAndUncertaintyConcentrationOfInvestmentAtFairValueToNetAssetsPercentage_019e83d4-c6e5-7856-a179-b47969bac5b5_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EbpRiskAndUncertaintyConcentrationOfInvestmentAtFairValueToNetAssetsPercentage" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Risk and Uncertainty, Concentration of Investment at Fair Value to Net Assets, Percentage</link:label>
    <link:label id="lab_us-gaap-ebp_EbpRiskAndUncertaintyConcentrationOfInvestmentAtFairValueToNetAssetsPercentage_label_en-US" xlink:label="lab_us-gaap-ebp_EbpRiskAndUncertaintyConcentrationOfInvestmentAtFairValueToNetAssetsPercentage" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Risk and Uncertainty, Concentration of Investment at Fair Value to Net Assets, Percentage</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EbpRiskAndUncertaintyConcentrationOfInvestmentAtFairValueToNetAssetsPercentage" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EbpRiskAndUncertaintyConcentrationOfInvestmentAtFairValueToNetAssetsPercentage"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EbpRiskAndUncertaintyConcentrationOfInvestmentAtFairValueToNetAssetsPercentage" xlink:to="lab_us-gaap-ebp_EbpRiskAndUncertaintyConcentrationOfInvestmentAtFairValueToNetAssetsPercentage" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EBPParticipantContributionRequisiteServicePeriod_019e83d4-c630-70a8-acf2-abf31bf2e3d8_terseLabel_en-US" xlink:label="lab_cost_EBPParticipantContributionRequisiteServicePeriod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Participant Contribution, Requisite Service Period [Line Items]</link:label>
    <link:label id="lab_cost_EBPParticipantContributionRequisiteServicePeriod_label_en-US" xlink:label="lab_cost_EBPParticipantContributionRequisiteServicePeriod" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Participant Contribution, Requisite Service Period</link:label>
    <link:label id="lab_cost_EBPParticipantContributionRequisiteServicePeriod_documentation_en-US" xlink:label="lab_cost_EBPParticipantContributionRequisiteServicePeriod" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Period of service required for participants to make contributions in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EBPParticipantContributionRequisiteServicePeriod" xlink:href="cost-20251231.xsd#cost_EBPParticipantContributionRequisiteServicePeriod"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EBPParticipantContributionRequisiteServicePeriod" xlink:to="lab_cost_EBPParticipantContributionRequisiteServicePeriod" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EBPMinimumAgeOfParticipants_019e83d4-c6e5-78f4-9490-aa84ef802c94_terseLabel_en-US" xlink:label="lab_cost_EBPMinimumAgeOfParticipants" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Minimum Age of Participants</link:label>
    <link:label id="lab_cost_EBPMinimumAgeOfParticipants_label_en-US" xlink:label="lab_cost_EBPMinimumAgeOfParticipants" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Minimum Age of Participants</link:label>
    <link:label id="lab_cost_EBPMinimumAgeOfParticipants_documentation_en-US" xlink:label="lab_cost_EBPMinimumAgeOfParticipants" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Minimum age an individually must be to participate in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EBPMinimumAgeOfParticipants" xlink:href="cost-20251231.xsd#cost_EBPMinimumAgeOfParticipants"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EBPMinimumAgeOfParticipants" xlink:to="lab_cost_EBPMinimumAgeOfParticipants" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EBPDiscretionaryContributionRatePerHour_019e83d4-c630-7aeb-8113-b8bf6b03e7c0_terseLabel_en-US" xlink:label="lab_cost_EBPDiscretionaryContributionRatePerHour" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Discretionary Contribution Rate Per Hour</link:label>
    <link:label id="lab_cost_EBPDiscretionaryContributionRatePerHour_label_en-US" xlink:label="lab_cost_EBPDiscretionaryContributionRatePerHour" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Discretionary Contribution Rate Per Hour</link:label>
    <link:label id="lab_cost_EBPDiscretionaryContributionRatePerHour_documentation_en-US" xlink:label="lab_cost_EBPDiscretionaryContributionRatePerHour" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Rate per hour of the discretionary contribution under employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EBPDiscretionaryContributionRatePerHour" xlink:href="cost-20251231.xsd#cost_EBPDiscretionaryContributionRatePerHour"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EBPDiscretionaryContributionRatePerHour" xlink:to="lab_cost_EBPDiscretionaryContributionRatePerHour" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanSubsequentEventPolicyTextBlock_019e83d4-c630-7746-98f7-c5a720521471_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanSubsequentEventPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Subsequent Events</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanSubsequentEventPolicyTextBlock_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanSubsequentEventPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Subsequent Event [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanSubsequentEventPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanSubsequentEventPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanSubsequentEventPolicyTextBlock" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanSubsequentEventPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTextBlock_019e83d4-c630-717a-8ebc-c5df850f5124_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Tax Status</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTextBlock_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Tax Status [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanTaxStatusTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTextBlock" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingToTotalAccountPercentage_019e83d4-c6e5-7eee-83f0-e600f349fb9f_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingToTotalAccountPercentage" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingToTotalAccountPercentage_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingToTotalAccountPercentage" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingToTotalAccountPercentage" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingToTotalAccountPercentage"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingToTotalAccountPercentage" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingToTotalAccountPercentage" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EBPInvestmentMaximumPercentageInCompanyStock_019e83d4-c630-7a42-a05c-66c357ab9134_terseLabel_en-US" xlink:label="lab_cost_EBPInvestmentMaximumPercentageInCompanyStock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Investment Maximum Percentage in Company Stock</link:label>
    <link:label id="lab_cost_EBPInvestmentMaximumPercentageInCompanyStock_label_en-US" xlink:label="lab_cost_EBPInvestmentMaximumPercentageInCompanyStock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Investment Maximum Percentage in Company Stock</link:label>
    <link:label id="lab_cost_EBPInvestmentMaximumPercentageInCompanyStock_documentation_en-US" xlink:label="lab_cost_EBPInvestmentMaximumPercentageInCompanyStock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The maximum percentage of investment in company stock in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EBPInvestmentMaximumPercentageInCompanyStock" xlink:href="cost-20251231.xsd#cost_EBPInvestmentMaximumPercentageInCompanyStock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EBPInvestmentMaximumPercentageInCompanyStock" xlink:to="lab_cost_EBPInvestmentMaximumPercentageInCompanyStock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CollectiveBargainingArrangementDomain_019e83d4-c630-7951-8c8a-7ccb34657bfb_terseLabel_en-US" xlink:label="lab_us-gaap_CollectiveBargainingArrangementDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Collective-Bargaining Arrangement [Domain]</link:label>
    <link:label id="lab_us-gaap_CollectiveBargainingArrangementDomain_label_en-US" xlink:label="lab_us-gaap_CollectiveBargainingArrangementDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Collective-Bargaining Arrangement [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollectiveBargainingArrangementDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollectiveBargainingArrangementDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CollectiveBargainingArrangementDomain" xlink:to="lab_us-gaap_CollectiveBargainingArrangementDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantPolicyTextBlock_019e83d4-c630-7e55-85b0-1845741ad545_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Notes Receivable from Participants</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantPolicyTextBlock_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Note Receivable from Participant [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantPolicyTextBlock" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestment_019e83d4-c630-7453-97c7-d6c761ee52e1_totalLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestment" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total net investment income</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestment_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestment" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestment" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestment" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CollectiveBargainingArrangementAxis_019e83d4-c630-72b2-830e-9c7abcdeec3c_terseLabel_en-US" xlink:label="lab_us-gaap_CollectiveBargainingArrangementAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Collective-Bargaining Arrangement [Axis]</link:label>
    <link:label id="lab_us-gaap_CollectiveBargainingArrangementAxis_label_en-US" xlink:label="lab_us-gaap_CollectiveBargainingArrangementAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Collective-Bargaining Arrangement [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollectiveBargainingArrangementAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollectiveBargainingArrangementAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CollectiveBargainingArrangementAxis" xlink:to="lab_us-gaap_CollectiveBargainingArrangementAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EBPDiscretionaryContributionAllocationRatePercentage_019e83d4-c630-7854-b32b-e019d48cec0e_terseLabel_en-US" xlink:label="lab_cost_EBPDiscretionaryContributionAllocationRatePercentage" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Discretionary Contribution Allocation Rate</link:label>
    <link:label id="lab_cost_EBPDiscretionaryContributionAllocationRatePercentage_label_en-US" xlink:label="lab_cost_EBPDiscretionaryContributionAllocationRatePercentage" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Discretionary Contribution Allocation Rate Percentage</link:label>
    <link:label id="lab_cost_EBPDiscretionaryContributionAllocationRatePercentage_documentation_en-US" xlink:label="lab_cost_EBPDiscretionaryContributionAllocationRatePercentage" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of allocation rate of the discretionary contribution under employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EBPDiscretionaryContributionAllocationRatePercentage" xlink:href="cost-20251231.xsd#cost_EBPDiscretionaryContributionAllocationRatePercentage"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EBPDiscretionaryContributionAllocationRatePercentage" xlink:to="lab_cost_EBPDiscretionaryContributionAllocationRatePercentage" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e83d4-c6e5-7014-a73e-91d00c954aa9_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Related Party and Party-in-Interest Transactions [Line Items]</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Related Party and Party-in-Interest Transactions [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit_019e83d4-c630-76b6-b86d-2576c1e2ae5c_totalLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net assets available for benefits</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit_019e83d4-c630-7a58-b5b9-668938ca6ba8_periodStartLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Net assets available for benefits, beginning of year</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit_019e83d4-c630-7645-8ab7-1d3e3c485a08_periodEndLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Net assets available for benefits, end of year</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Net Asset Available for Benefit</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairAndContractValue_019e83d4-c630-77e3-af3a-3410e2fa34e7_totalLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairAndContractValue" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total investments</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairAndContractValue_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairAndContractValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Investment, Excluding Plan Interest in Master Trust, Fair and Contract Value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairAndContractValue" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairAndContractValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairAndContractValue" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairAndContractValue" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityDomain_019e83d4-c630-753b-9420-6e3557125085_terseLabel_en-US" xlink:label="lab_dei_EntityDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity [Domain]</link:label>
    <link:label id="lab_dei_EntityDomain_label_en-US" xlink:label="lab_dei_EntityDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityDomain" xlink:to="lab_dei_EntityDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContributionAbstract_019e83d4-c630-75bd-8563-b8bad5883b62_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContributionAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contributions to the Plan:</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContributionAbstract_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContributionAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContributionAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContributionAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContributionAbstract" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContributionAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustContractValue_019e83d4-c630-7161-98b4-67d4b58a78bb_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustContractValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fully benefit-responsive investment contracts</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustContractValue_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustContractValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Investment, Excluding Plan Interest in Master Trust, Contract Value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustContractValue" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustContractValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustContractValue" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustContractValue" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage_019e83d4-c630-7631-a018-3d92ccda951a_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Employer Contribution, Matching Percentage</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Employer Contribution, Matching Percentage</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EmployeeTypeDomain_019e83d4-c6e5-7236-bf46-b21f7fb18ab2_terseLabel_en-US" xlink:label="lab_cost_EmployeeTypeDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Employee Type [Domain]</link:label>
    <link:label id="lab_cost_EmployeeTypeDomain_label_en-US" xlink:label="lab_cost_EmployeeTypeDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Type [Domain]</link:label>
    <link:label id="lab_cost_EmployeeTypeDomain_documentation_en-US" xlink:label="lab_cost_EmployeeTypeDomain" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Employee Type [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EmployeeTypeDomain" xlink:href="cost-20251231.xsd#cost_EmployeeTypeDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EmployeeTypeDomain" xlink:to="lab_cost_EmployeeTypeDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019e83d4-c630-7869-9501-3597ab6627a9_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Measured at Net Asset Value Per Share</link:label>
    <link:label id="lab_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_label_en-US" xlink:label="lab_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Measured at Net Asset Value Per Share [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember" xlink:to="lab_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e83d4-c630-7eeb-95ee-919ec9a4dfa9_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Investment, Fair Value and NAV [Table]</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Investment, Fair Value and NAV [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019e83d4-c630-7a78-8534-5aeb2efd33fe_terseLabel_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EBP, Statement of Net Asset Available for Benefit [Line Items]</link:label>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Statement of Net Asset Available for Benefit [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_MarketApproachValuationTechniqueMember_label_en-US" xlink:label="lab_us-gaap_MarketApproachValuationTechniqueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Valuation, Market Approach [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketApproachValuationTechniqueMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketApproachValuationTechniqueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MarketApproachValuationTechniqueMember" xlink:to="lab_us-gaap_MarketApproachValuationTechniqueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_PIMCOMember_label_en-US" xlink:label="lab_cost_PIMCOMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PIMCO [Member]</link:label>
    <link:label id="lab_cost_PIMCOMember_documentation_en-US" xlink:label="lab_cost_PIMCOMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">PIMCO</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_PIMCOMember" xlink:href="cost-20251231.xsd#cost_PIMCOMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_PIMCOMember" xlink:to="lab_cost_PIMCOMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedMember_label_en-US" xlink:label="lab_us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EBP, Participant-Directed [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedMember" xlink:to="lab_us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CapitalGroupMember_label_en-US" xlink:label="lab_cost_CapitalGroupMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Group [Member]</link:label>
    <link:label id="lab_cost_CapitalGroupMember_documentation_en-US" xlink:label="lab_cost_CapitalGroupMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Capital Group</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CapitalGroupMember" xlink:href="cost-20251231.xsd#cost_CapitalGroupMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CapitalGroupMember" xlink:to="lab_cost_CapitalGroupMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_StateStreetMember_label_en-US" xlink:label="lab_cost_StateStreetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">State Street [Member]</link:label>
    <link:label id="lab_cost_StateStreetMember_documentation_en-US" xlink:label="lab_cost_StateStreetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">State Street</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_StateStreetMember" xlink:href="cost-20251231.xsd#cost_StateStreetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_StateStreetMember" xlink:to="lab_cost_StateStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_T.RowePriceMember_label_en-US" xlink:label="lab_cost_T.RowePriceMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">T. Rowe Price [Member]</link:label>
    <link:label id="lab_cost_T.RowePriceMember_documentation_en-US" xlink:label="lab_cost_T.RowePriceMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">T. Rowe Price</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_T.RowePriceMember" xlink:href="cost-20251231.xsd#cost_T.RowePriceMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_T.RowePriceMember" xlink:to="lab_cost_T.RowePriceMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_WellingtonMember_label_en-US" xlink:label="lab_cost_WellingtonMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Wellington [Member]</link:label>
    <link:label id="lab_cost_WellingtonMember_documentation_en-US" xlink:label="lab_cost_WellingtonMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Wellington</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_WellingtonMember" xlink:href="cost-20251231.xsd#cost_WellingtonMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_WellingtonMember" xlink:to="lab_cost_WellingtonMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AgilentTechnologiesInc.Member_label_en-US" xlink:label="lab_cost_AgilentTechnologiesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Agilent Technologies Inc. [Member]</link:label>
    <link:label id="lab_cost_AgilentTechnologiesInc.Member_documentation_en-US" xlink:label="lab_cost_AgilentTechnologiesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Agilent Technologies Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AgilentTechnologiesInc.Member" xlink:href="cost-20251231.xsd#cost_AgilentTechnologiesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AgilentTechnologiesInc.Member" xlink:to="lab_cost_AgilentTechnologiesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CommonStockMember_label_en-US" xlink:label="lab_us-gaap_CommonStockMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockMember" xlink:to="lab_us-gaap_CommonStockMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AlignTechnologyInc.Member_label_en-US" xlink:label="lab_cost_AlignTechnologyInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Align Technology Inc. [Member]</link:label>
    <link:label id="lab_cost_AlignTechnologyInc.Member_documentation_en-US" xlink:label="lab_cost_AlignTechnologyInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Align Technology Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AlignTechnologyInc.Member" xlink:href="cost-20251231.xsd#cost_AlignTechnologyInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AlignTechnologyInc.Member" xlink:to="lab_cost_AlignTechnologyInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AlnylamPharmaceuticalsInc.Member_label_en-US" xlink:label="lab_cost_AlnylamPharmaceuticalsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Alnylam Pharmaceuticals Inc. [Member]</link:label>
    <link:label id="lab_cost_AlnylamPharmaceuticalsInc.Member_documentation_en-US" xlink:label="lab_cost_AlnylamPharmaceuticalsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Alnylam Pharmaceuticals Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AlnylamPharmaceuticalsInc.Member" xlink:href="cost-20251231.xsd#cost_AlnylamPharmaceuticalsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AlnylamPharmaceuticalsInc.Member" xlink:to="lab_cost_AlnylamPharmaceuticalsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AmphenolCorp.ClassAMember_label_en-US" xlink:label="lab_cost_AmphenolCorp.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amphenol Corp., Class A [Member]</link:label>
    <link:label id="lab_cost_AmphenolCorp.ClassAMember_documentation_en-US" xlink:label="lab_cost_AmphenolCorp.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amphenol Corp., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AmphenolCorp.ClassAMember" xlink:href="cost-20251231.xsd#cost_AmphenolCorp.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AmphenolCorp.ClassAMember" xlink:to="lab_cost_AmphenolCorp.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ArcellxInc.Member_label_en-US" xlink:label="lab_cost_ArcellxInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Arcellx Inc. [Member]</link:label>
    <link:label id="lab_cost_ArcellxInc.Member_documentation_en-US" xlink:label="lab_cost_ArcellxInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Arcellx Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ArcellxInc.Member" xlink:href="cost-20251231.xsd#cost_ArcellxInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ArcellxInc.Member" xlink:to="lab_cost_ArcellxInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AssurantInc.Member_label_en-US" xlink:label="lab_cost_AssurantInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assurant Inc. [Member]</link:label>
    <link:label id="lab_cost_AssurantInc.Member_documentation_en-US" xlink:label="lab_cost_AssurantInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Assurant Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AssurantInc.Member" xlink:href="cost-20251231.xsd#cost_AssurantInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AssurantInc.Member" xlink:to="lab_cost_AssurantInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AtlassianCorp.ClassAMember_label_en-US" xlink:label="lab_cost_AtlassianCorp.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Atlassian Corp., Class A [Member]</link:label>
    <link:label id="lab_cost_AtlassianCorp.ClassAMember_documentation_en-US" xlink:label="lab_cost_AtlassianCorp.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Atlassian Corp., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AtlassianCorp.ClassAMember" xlink:href="cost-20251231.xsd#cost_AtlassianCorp.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AtlassianCorp.ClassAMember" xlink:to="lab_cost_AtlassianCorp.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AuroraInnovationInc.ClassAMember_label_en-US" xlink:label="lab_cost_AuroraInnovationInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Aurora Innovation Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_AuroraInnovationInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_AuroraInnovationInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Aurora Innovation Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AuroraInnovationInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_AuroraInnovationInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AuroraInnovationInc.ClassAMember" xlink:to="lab_cost_AuroraInnovationInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AvantorInc.Member_label_en-US" xlink:label="lab_cost_AvantorInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Avantor Inc. [Member]</link:label>
    <link:label id="lab_cost_AvantorInc.Member_documentation_en-US" xlink:label="lab_cost_AvantorInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Avantor Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AvantorInc.Member" xlink:href="cost-20251231.xsd#cost_AvantorInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AvantorInc.Member" xlink:to="lab_cost_AvantorInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AveryDennisonCorp.Member_label_en-US" xlink:label="lab_cost_AveryDennisonCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Avery Dennison Corp. [Member]</link:label>
    <link:label id="lab_cost_AveryDennisonCorp.Member_documentation_en-US" xlink:label="lab_cost_AveryDennisonCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Avery Dennison Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AveryDennisonCorp.Member" xlink:href="cost-20251231.xsd#cost_AveryDennisonCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AveryDennisonCorp.Member" xlink:to="lab_cost_AveryDennisonCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BallCorp.Member_label_en-US" xlink:label="lab_cost_BallCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ball Corp. [Member]</link:label>
    <link:label id="lab_cost_BallCorp.Member_documentation_en-US" xlink:label="lab_cost_BallCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Ball Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BallCorp.Member" xlink:href="cost-20251231.xsd#cost_BallCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BallCorp.Member" xlink:to="lab_cost_BallCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BiogenInc.Member_label_en-US" xlink:label="lab_cost_BiogenInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Biogen Inc. [Member]</link:label>
    <link:label id="lab_cost_BiogenInc.Member_documentation_en-US" xlink:label="lab_cost_BiogenInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Biogen Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BiogenInc.Member" xlink:href="cost-20251231.xsd#cost_BiogenInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BiogenInc.Member" xlink:to="lab_cost_BiogenInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BoozAllenHamiltonHoldingsCorporationClassAMember_label_en-US" xlink:label="lab_cost_BoozAllenHamiltonHoldingsCorporationClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Booz Allen Hamilton Holdings Corporation, Class A [Member]</link:label>
    <link:label id="lab_cost_BoozAllenHamiltonHoldingsCorporationClassAMember_documentation_en-US" xlink:label="lab_cost_BoozAllenHamiltonHoldingsCorporationClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Booz Allen Hamilton Holdings Corporation, Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BoozAllenHamiltonHoldingsCorporationClassAMember" xlink:href="cost-20251231.xsd#cost_BoozAllenHamiltonHoldingsCorporationClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BoozAllenHamiltonHoldingsCorporationClassAMember" xlink:to="lab_cost_BoozAllenHamiltonHoldingsCorporationClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BroadridgeFinancialSolutionsInc.Member_label_en-US" xlink:label="lab_cost_BroadridgeFinancialSolutionsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Broadridge Financial Solutions Inc. [Member]</link:label>
    <link:label id="lab_cost_BroadridgeFinancialSolutionsInc.Member_documentation_en-US" xlink:label="lab_cost_BroadridgeFinancialSolutionsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Broadridge Financial Solutions Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BroadridgeFinancialSolutionsInc.Member" xlink:href="cost-20251231.xsd#cost_BroadridgeFinancialSolutionsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BroadridgeFinancialSolutionsInc.Member" xlink:to="lab_cost_BroadridgeFinancialSolutionsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BrukerCorp.Member_label_en-US" xlink:label="lab_cost_BrukerCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Bruker Corp. [Member]</link:label>
    <link:label id="lab_cost_BrukerCorp.Member_documentation_en-US" xlink:label="lab_cost_BrukerCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Bruker Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BrukerCorp.Member" xlink:href="cost-20251231.xsd#cost_BrukerCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BrukerCorp.Member" xlink:to="lab_cost_BrukerCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BurlingtonStoresInc.Member_label_en-US" xlink:label="lab_cost_BurlingtonStoresInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Burlington Stores Inc. [Member]</link:label>
    <link:label id="lab_cost_BurlingtonStoresInc.Member_documentation_en-US" xlink:label="lab_cost_BurlingtonStoresInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Burlington Stores Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BurlingtonStoresInc.Member" xlink:href="cost-20251231.xsd#cost_BurlingtonStoresInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BurlingtonStoresInc.Member" xlink:to="lab_cost_BurlingtonStoresInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BWXTechologiesInc.Member_label_en-US" xlink:label="lab_cost_BWXTechologiesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">BWX Techologies Inc. [Member]</link:label>
    <link:label id="lab_cost_BWXTechologiesInc.Member_documentation_en-US" xlink:label="lab_cost_BWXTechologiesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">BWX Techologies Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BWXTechologiesInc.Member" xlink:href="cost-20251231.xsd#cost_BWXTechologiesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BWXTechologiesInc.Member" xlink:to="lab_cost_BWXTechologiesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CarisLifeSciencesInc.Member_label_en-US" xlink:label="lab_cost_CarisLifeSciencesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Caris Life Sciences Inc. [Member]</link:label>
    <link:label id="lab_cost_CarisLifeSciencesInc.Member_documentation_en-US" xlink:label="lab_cost_CarisLifeSciencesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Caris Life Sciences Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CarisLifeSciencesInc.Member" xlink:href="cost-20251231.xsd#cost_CarisLifeSciencesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CarisLifeSciencesInc.Member" xlink:to="lab_cost_CarisLifeSciencesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CaseysGeneralStoresInc.Member_label_en-US" xlink:label="lab_cost_CaseysGeneralStoresInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Casey's General Stores Inc. [Member]</link:label>
    <link:label id="lab_cost_CaseysGeneralStoresInc.Member_documentation_en-US" xlink:label="lab_cost_CaseysGeneralStoresInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Casey's General Stores Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CaseysGeneralStoresInc.Member" xlink:href="cost-20251231.xsd#cost_CaseysGeneralStoresInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CaseysGeneralStoresInc.Member" xlink:to="lab_cost_CaseysGeneralStoresInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CboeGlobalMarketsInc.Member_label_en-US" xlink:label="lab_cost_CboeGlobalMarketsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cboe Global Markets Inc. [Member]</link:label>
    <link:label id="lab_cost_CboeGlobalMarketsInc.Member_documentation_en-US" xlink:label="lab_cost_CboeGlobalMarketsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cboe Global Markets Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CboeGlobalMarketsInc.Member" xlink:href="cost-20251231.xsd#cost_CboeGlobalMarketsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CboeGlobalMarketsInc.Member" xlink:to="lab_cost_CboeGlobalMarketsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CCCIntelligentSolutionsHoldingsInc.Member_label_en-US" xlink:label="lab_cost_CCCIntelligentSolutionsHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">CCC Intelligent Solutions Holdings Inc. [Member]</link:label>
    <link:label id="lab_cost_CCCIntelligentSolutionsHoldingsInc.Member_documentation_en-US" xlink:label="lab_cost_CCCIntelligentSolutionsHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">CCC Intelligent Solutions Holdings Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CCCIntelligentSolutionsHoldingsInc.Member" xlink:href="cost-20251231.xsd#cost_CCCIntelligentSolutionsHoldingsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CCCIntelligentSolutionsHoldingsInc.Member" xlink:to="lab_cost_CCCIntelligentSolutionsHoldingsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CencoraInc.Member_label_en-US" xlink:label="lab_cost_CencoraInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cencora Inc. [Member]</link:label>
    <link:label id="lab_cost_CencoraInc.Member_documentation_en-US" xlink:label="lab_cost_CencoraInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cencora Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CencoraInc.Member" xlink:href="cost-20251231.xsd#cost_CencoraInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CencoraInc.Member" xlink:to="lab_cost_CencoraInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CheniereEnergyInc.Member_label_en-US" xlink:label="lab_cost_CheniereEnergyInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cheniere Energy Inc. [Member]</link:label>
    <link:label id="lab_cost_CheniereEnergyInc.Member_documentation_en-US" xlink:label="lab_cost_CheniereEnergyInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cheniere Energy Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CheniereEnergyInc.Member" xlink:href="cost-20251231.xsd#cost_CheniereEnergyInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CheniereEnergyInc.Member" xlink:to="lab_cost_CheniereEnergyInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CorceptTherapeuticsIncorporatedMember_label_en-US" xlink:label="lab_cost_CorceptTherapeuticsIncorporatedMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Corcept Therapeutics Incorporated [Member]</link:label>
    <link:label id="lab_cost_CorceptTherapeuticsIncorporatedMember_documentation_en-US" xlink:label="lab_cost_CorceptTherapeuticsIncorporatedMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Corcept Therapeutics Incorporated</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CorceptTherapeuticsIncorporatedMember" xlink:href="cost-20251231.xsd#cost_CorceptTherapeuticsIncorporatedMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CorceptTherapeuticsIncorporatedMember" xlink:to="lab_cost_CorceptTherapeuticsIncorporatedMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CorningIncorporatedMember_label_en-US" xlink:label="lab_cost_CorningIncorporatedMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Corning Incorporated [Member]</link:label>
    <link:label id="lab_cost_CorningIncorporatedMember_documentation_en-US" xlink:label="lab_cost_CorningIncorporatedMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Corning Incorporated</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CorningIncorporatedMember" xlink:href="cost-20251231.xsd#cost_CorningIncorporatedMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CorningIncorporatedMember" xlink:to="lab_cost_CorningIncorporatedMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CorpayInc.Member_label_en-US" xlink:label="lab_cost_CorpayInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Corpay Inc. [Member]</link:label>
    <link:label id="lab_cost_CorpayInc.Member_documentation_en-US" xlink:label="lab_cost_CorpayInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Corpay Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CorpayInc.Member" xlink:href="cost-20251231.xsd#cost_CorpayInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CorpayInc.Member" xlink:to="lab_cost_CorpayInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CostarGroupInc.Member_label_en-US" xlink:label="lab_cost_CostarGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Costar Group Inc. [Member]</link:label>
    <link:label id="lab_cost_CostarGroupInc.Member_documentation_en-US" xlink:label="lab_cost_CostarGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Costar Group Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CostarGroupInc.Member" xlink:href="cost-20251231.xsd#cost_CostarGroupInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CostarGroupInc.Member" xlink:to="lab_cost_CostarGroupInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CytokineticsIncorporatedMember_label_en-US" xlink:label="lab_cost_CytokineticsIncorporatedMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cytokinetics Incorporated [Member]</link:label>
    <link:label id="lab_cost_CytokineticsIncorporatedMember_documentation_en-US" xlink:label="lab_cost_CytokineticsIncorporatedMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cytokinetics Incorporated</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CytokineticsIncorporatedMember" xlink:href="cost-20251231.xsd#cost_CytokineticsIncorporatedMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CytokineticsIncorporatedMember" xlink:to="lab_cost_CytokineticsIncorporatedMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_DollarTreeInc.Member_label_en-US" xlink:label="lab_cost_DollarTreeInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Dollar Tree Inc. [Member]</link:label>
    <link:label id="lab_cost_DollarTreeInc.Member_documentation_en-US" xlink:label="lab_cost_DollarTreeInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Dollar Tree Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_DollarTreeInc.Member" xlink:href="cost-20251231.xsd#cost_DollarTreeInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_DollarTreeInc.Member" xlink:to="lab_cost_DollarTreeInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_DominosPizzaInc.Member_label_en-US" xlink:label="lab_cost_DominosPizzaInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Domino's Pizza Inc. [Member]</link:label>
    <link:label id="lab_cost_DominosPizzaInc.Member_documentation_en-US" xlink:label="lab_cost_DominosPizzaInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Domino's Pizza Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_DominosPizzaInc.Member" xlink:href="cost-20251231.xsd#cost_DominosPizzaInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_DominosPizzaInc.Member" xlink:to="lab_cost_DominosPizzaInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_DraftKingsInc.ClassAMember_label_en-US" xlink:label="lab_cost_DraftKingsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">DraftKings Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_DraftKingsInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_DraftKingsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">DraftKings Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_DraftKingsInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_DraftKingsInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_DraftKingsInc.ClassAMember" xlink:to="lab_cost_DraftKingsInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_DTMidstreamInc.Member_label_en-US" xlink:label="lab_cost_DTMidstreamInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">DT Midstream Inc. [Member]</link:label>
    <link:label id="lab_cost_DTMidstreamInc.Member_documentation_en-US" xlink:label="lab_cost_DTMidstreamInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">DT Midstream Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_DTMidstreamInc.Member" xlink:href="cost-20251231.xsd#cost_DTMidstreamInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_DTMidstreamInc.Member" xlink:to="lab_cost_DTMidstreamInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_DuolingoInc.Member_label_en-US" xlink:label="lab_cost_DuolingoInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Duolingo Inc. [Member]</link:label>
    <link:label id="lab_cost_DuolingoInc.Member_documentation_en-US" xlink:label="lab_cost_DuolingoInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Duolingo Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_DuolingoInc.Member" xlink:href="cost-20251231.xsd#cost_DuolingoInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_DuolingoInc.Member" xlink:to="lab_cost_DuolingoInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ElancoAnimalHealthInc.Member_label_en-US" xlink:label="lab_cost_ElancoAnimalHealthInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Elanco Animal Health Inc. [Member]</link:label>
    <link:label id="lab_cost_ElancoAnimalHealthInc.Member_documentation_en-US" xlink:label="lab_cost_ElancoAnimalHealthInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Elanco Animal Health Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ElancoAnimalHealthInc.Member" xlink:href="cost-20251231.xsd#cost_ElancoAnimalHealthInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ElancoAnimalHealthInc.Member" xlink:to="lab_cost_ElancoAnimalHealthInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EncompassHealthCorp.Member_label_en-US" xlink:label="lab_cost_EncompassHealthCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Encompass Health Corp. [Member]</link:label>
    <link:label id="lab_cost_EncompassHealthCorp.Member_documentation_en-US" xlink:label="lab_cost_EncompassHealthCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Encompass Health Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EncompassHealthCorp.Member" xlink:href="cost-20251231.xsd#cost_EncompassHealthCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EncompassHealthCorp.Member" xlink:to="lab_cost_EncompassHealthCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EQTCorp.Member_label_en-US" xlink:label="lab_cost_EQTCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EQT Corp. [Member]</link:label>
    <link:label id="lab_cost_EQTCorp.Member_documentation_en-US" xlink:label="lab_cost_EQTCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">EQT Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EQTCorp.Member" xlink:href="cost-20251231.xsd#cost_EQTCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EQTCorp.Member" xlink:to="lab_cost_EQTCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EquifaxInc.Member_label_en-US" xlink:label="lab_cost_EquifaxInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equifax Inc. [Member]</link:label>
    <link:label id="lab_cost_EquifaxInc.Member_documentation_en-US" xlink:label="lab_cost_EquifaxInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Equifax Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EquifaxInc.Member" xlink:href="cost-20251231.xsd#cost_EquifaxInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EquifaxInc.Member" xlink:to="lab_cost_EquifaxInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EverpureInc.Member_label_en-US" xlink:label="lab_cost_EverpureInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Everpure Inc. [Member]</link:label>
    <link:label id="lab_cost_EverpureInc.Member_documentation_en-US" xlink:label="lab_cost_EverpureInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Everpure Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EverpureInc.Member" xlink:href="cost-20251231.xsd#cost_EverpureInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EverpureInc.Member" xlink:to="lab_cost_EverpureInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ExpandEnergyCorp.Member_label_en-US" xlink:label="lab_cost_ExpandEnergyCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Expand Energy Corp. [Member]</link:label>
    <link:label id="lab_cost_ExpandEnergyCorp.Member_documentation_en-US" xlink:label="lab_cost_ExpandEnergyCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Expand Energy Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ExpandEnergyCorp.Member" xlink:href="cost-20251231.xsd#cost_ExpandEnergyCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ExpandEnergyCorp.Member" xlink:to="lab_cost_ExpandEnergyCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_FortiveCorp.Member_label_en-US" xlink:label="lab_cost_FortiveCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fortive Corp. [Member]</link:label>
    <link:label id="lab_cost_FortiveCorp.Member_documentation_en-US" xlink:label="lab_cost_FortiveCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Fortive Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_FortiveCorp.Member" xlink:href="cost-20251231.xsd#cost_FortiveCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_FortiveCorp.Member" xlink:to="lab_cost_FortiveCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_HiltonWorlwideHoldingsInc.Member_label_en-US" xlink:label="lab_cost_HiltonWorlwideHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Hilton Worlwide Holdings Inc. [Member]</link:label>
    <link:label id="lab_cost_HiltonWorlwideHoldingsInc.Member_documentation_en-US" xlink:label="lab_cost_HiltonWorlwideHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Hilton Worlwide Holdings Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_HiltonWorlwideHoldingsInc.Member" xlink:href="cost-20251231.xsd#cost_HiltonWorlwideHoldingsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_HiltonWorlwideHoldingsInc.Member" xlink:to="lab_cost_HiltonWorlwideHoldingsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_HologicInc.Member_label_en-US" xlink:label="lab_cost_HologicInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Hologic Inc. [Member]</link:label>
    <link:label id="lab_cost_HologicInc.Member_documentation_en-US" xlink:label="lab_cost_HologicInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Hologic Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_HologicInc.Member" xlink:href="cost-20251231.xsd#cost_HologicInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_HologicInc.Member" xlink:to="lab_cost_HologicInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_HubspotInc.Member_label_en-US" xlink:label="lab_cost_HubspotInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Hubspot Inc. [Member]</link:label>
    <link:label id="lab_cost_HubspotInc.Member_documentation_en-US" xlink:label="lab_cost_HubspotInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Hubspot Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_HubspotInc.Member" xlink:href="cost-20251231.xsd#cost_HubspotInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_HubspotInc.Member" xlink:to="lab_cost_HubspotInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_IngersollRandInc.Member_label_en-US" xlink:label="lab_cost_IngersollRandInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ingersoll Rand Inc. [Member]</link:label>
    <link:label id="lab_cost_IngersollRandInc.Member_documentation_en-US" xlink:label="lab_cost_IngersollRandInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Ingersoll Rand Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_IngersollRandInc.Member" xlink:href="cost-20251231.xsd#cost_IngersollRandInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_IngersollRandInc.Member" xlink:to="lab_cost_IngersollRandInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_IonisPharmaceuticalsInc.Member_label_en-US" xlink:label="lab_cost_IonisPharmaceuticalsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ionis Pharmaceuticals Inc. [Member]</link:label>
    <link:label id="lab_cost_IonisPharmaceuticalsInc.Member_documentation_en-US" xlink:label="lab_cost_IonisPharmaceuticalsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Ionis Pharmaceuticals Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_IonisPharmaceuticalsInc.Member" xlink:href="cost-20251231.xsd#cost_IonisPharmaceuticalsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_IonisPharmaceuticalsInc.Member" xlink:to="lab_cost_IonisPharmaceuticalsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ITTInc.Member_label_en-US" xlink:label="lab_cost_ITTInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ITT Inc. [Member]</link:label>
    <link:label id="lab_cost_ITTInc.Member_documentation_en-US" xlink:label="lab_cost_ITTInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ITT Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ITTInc.Member" xlink:href="cost-20251231.xsd#cost_ITTInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ITTInc.Member" xlink:to="lab_cost_ITTInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_KeysightTechnologiesInc.Member_label_en-US" xlink:label="lab_cost_KeysightTechnologiesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Keysight Technologies Inc. [Member]</link:label>
    <link:label id="lab_cost_KeysightTechnologiesInc.Member_documentation_en-US" xlink:label="lab_cost_KeysightTechnologiesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Keysight Technologies Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_KeysightTechnologiesInc.Member" xlink:href="cost-20251231.xsd#cost_KeysightTechnologiesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_KeysightTechnologiesInc.Member" xlink:to="lab_cost_KeysightTechnologiesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_LatticeSemiconductorCorp.Member_label_en-US" xlink:label="lab_cost_LatticeSemiconductorCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lattice Semiconductor Corp. [Member]</link:label>
    <link:label id="lab_cost_LatticeSemiconductorCorp.Member_documentation_en-US" xlink:label="lab_cost_LatticeSemiconductorCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Lattice Semiconductor Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_LatticeSemiconductorCorp.Member" xlink:href="cost-20251231.xsd#cost_LatticeSemiconductorCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_LatticeSemiconductorCorp.Member" xlink:to="lab_cost_LatticeSemiconductorCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_LibertyLiveHoldingsInc.SeriesCMember_label_en-US" xlink:label="lab_cost_LibertyLiveHoldingsInc.SeriesCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liberty Live Holdings Inc., Series C [Member]</link:label>
    <link:label id="lab_cost_LibertyLiveHoldingsInc.SeriesCMember_documentation_en-US" xlink:label="lab_cost_LibertyLiveHoldingsInc.SeriesCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Liberty Live Holdings Inc., Series C</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_LibertyLiveHoldingsInc.SeriesCMember" xlink:href="cost-20251231.xsd#cost_LibertyLiveHoldingsInc.SeriesCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_LibertyLiveHoldingsInc.SeriesCMember" xlink:to="lab_cost_LibertyLiveHoldingsInc.SeriesCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_LibertyMediaCorp.SeriesCLibertyFormulaOneMember_label_en-US" xlink:label="lab_cost_LibertyMediaCorp.SeriesCLibertyFormulaOneMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liberty Media Corp., Series C Liberty Formula One [Member]</link:label>
    <link:label id="lab_cost_LibertyMediaCorp.SeriesCLibertyFormulaOneMember_documentation_en-US" xlink:label="lab_cost_LibertyMediaCorp.SeriesCLibertyFormulaOneMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Liberty Media Corp., Series C Liberty Formula One</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_LibertyMediaCorp.SeriesCLibertyFormulaOneMember" xlink:href="cost-20251231.xsd#cost_LibertyMediaCorp.SeriesCLibertyFormulaOneMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_LibertyMediaCorp.SeriesCLibertyFormulaOneMember" xlink:to="lab_cost_LibertyMediaCorp.SeriesCLibertyFormulaOneMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_LiveNationEntertainmentInc.Member_label_en-US" xlink:label="lab_cost_LiveNationEntertainmentInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Live Nation Entertainment Inc. [Member]</link:label>
    <link:label id="lab_cost_LiveNationEntertainmentInc.Member_documentation_en-US" xlink:label="lab_cost_LiveNationEntertainmentInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Live Nation Entertainment Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_LiveNationEntertainmentInc.Member" xlink:href="cost-20251231.xsd#cost_LiveNationEntertainmentInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_LiveNationEntertainmentInc.Member" xlink:to="lab_cost_LiveNationEntertainmentInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MACOMTechnologySolutionsHoldingsInc.Member_label_en-US" xlink:label="lab_cost_MACOMTechnologySolutionsHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">MACOM Technology Solutions Holdings Inc. [Member]</link:label>
    <link:label id="lab_cost_MACOMTechnologySolutionsHoldingsInc.Member_documentation_en-US" xlink:label="lab_cost_MACOMTechnologySolutionsHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">MACOM Technology Solutions Holdings Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MACOMTechnologySolutionsHoldingsInc.Member" xlink:href="cost-20251231.xsd#cost_MACOMTechnologySolutionsHoldingsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MACOMTechnologySolutionsHoldingsInc.Member" xlink:to="lab_cost_MACOMTechnologySolutionsHoldingsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ManhattanAssociatesInc.Member_label_en-US" xlink:label="lab_cost_ManhattanAssociatesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Manhattan Associates Inc. [Member]</link:label>
    <link:label id="lab_cost_ManhattanAssociatesInc.Member_documentation_en-US" xlink:label="lab_cost_ManhattanAssociatesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Manhattan Associates Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ManhattanAssociatesInc.Member" xlink:href="cost-20251231.xsd#cost_ManhattanAssociatesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ManhattanAssociatesInc.Member" xlink:to="lab_cost_ManhattanAssociatesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MaplebearInc.Member_label_en-US" xlink:label="lab_cost_MaplebearInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maplebear Inc. [Member]</link:label>
    <link:label id="lab_cost_MaplebearInc.Member_documentation_en-US" xlink:label="lab_cost_MaplebearInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Maplebear Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MaplebearInc.Member" xlink:href="cost-20251231.xsd#cost_MaplebearInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MaplebearInc.Member" xlink:to="lab_cost_MaplebearInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MarkelGroupInc.Member_label_en-US" xlink:label="lab_cost_MarkelGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Markel Group Inc. [Member]</link:label>
    <link:label id="lab_cost_MarkelGroupInc.Member_documentation_en-US" xlink:label="lab_cost_MarkelGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Markel Group Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MarkelGroupInc.Member" xlink:href="cost-20251231.xsd#cost_MarkelGroupInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MarkelGroupInc.Member" xlink:to="lab_cost_MarkelGroupInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MartinMariettaMaterialsInc.Member_label_en-US" xlink:label="lab_cost_MartinMariettaMaterialsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Martin Marietta Materials Inc. [Member]</link:label>
    <link:label id="lab_cost_MartinMariettaMaterialsInc.Member_documentation_en-US" xlink:label="lab_cost_MartinMariettaMaterialsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Martin Marietta Materials Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MartinMariettaMaterialsInc.Member" xlink:href="cost-20251231.xsd#cost_MartinMariettaMaterialsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MartinMariettaMaterialsInc.Member" xlink:to="lab_cost_MartinMariettaMaterialsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MasimoCorp.Member_label_en-US" xlink:label="lab_cost_MasimoCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Masimo Corp. [Member]</link:label>
    <link:label id="lab_cost_MasimoCorp.Member_documentation_en-US" xlink:label="lab_cost_MasimoCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Masimo Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MasimoCorp.Member" xlink:href="cost-20251231.xsd#cost_MasimoCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MasimoCorp.Member" xlink:to="lab_cost_MasimoCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_McCormickCompanyInc.Member_label_en-US" xlink:label="lab_cost_McCormickCompanyInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">McCormick &amp; Company Inc. [Member]</link:label>
    <link:label id="lab_cost_McCormickCompanyInc.Member_documentation_en-US" xlink:label="lab_cost_McCormickCompanyInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">McCormick &amp; Company Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_McCormickCompanyInc.Member" xlink:href="cost-20251231.xsd#cost_McCormickCompanyInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_McCormickCompanyInc.Member" xlink:to="lab_cost_McCormickCompanyInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_McGrawHillInc.Member_label_en-US" xlink:label="lab_cost_McGrawHillInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">McGraw Hill Inc. [Member]</link:label>
    <link:label id="lab_cost_McGrawHillInc.Member_documentation_en-US" xlink:label="lab_cost_McGrawHillInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">McGraw Hill Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_McGrawHillInc.Member" xlink:href="cost-20251231.xsd#cost_McGrawHillInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_McGrawHillInc.Member" xlink:to="lab_cost_McGrawHillInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MettlerToldeoInternationalInc.Member_label_en-US" xlink:label="lab_cost_MettlerToldeoInternationalInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Mettler-Toldeo International Inc. [Member]</link:label>
    <link:label id="lab_cost_MettlerToldeoInternationalInc.Member_documentation_en-US" xlink:label="lab_cost_MettlerToldeoInternationalInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Mettler-Toldeo International Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MettlerToldeoInternationalInc.Member" xlink:href="cost-20251231.xsd#cost_MettlerToldeoInternationalInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MettlerToldeoInternationalInc.Member" xlink:to="lab_cost_MettlerToldeoInternationalInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MicrochipTechnologyInc.Member_label_en-US" xlink:label="lab_cost_MicrochipTechnologyInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Microchip Technology Inc. [Member]</link:label>
    <link:label id="lab_cost_MicrochipTechnologyInc.Member_documentation_en-US" xlink:label="lab_cost_MicrochipTechnologyInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Microchip Technology Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MicrochipTechnologyInc.Member" xlink:href="cost-20251231.xsd#cost_MicrochipTechnologyInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MicrochipTechnologyInc.Member" xlink:to="lab_cost_MicrochipTechnologyInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MolinaHealthcareInc.Member_label_en-US" xlink:label="lab_cost_MolinaHealthcareInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Molina Healthcare Inc. [Member]</link:label>
    <link:label id="lab_cost_MolinaHealthcareInc.Member_documentation_en-US" xlink:label="lab_cost_MolinaHealthcareInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Molina Healthcare Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MolinaHealthcareInc.Member" xlink:href="cost-20251231.xsd#cost_MolinaHealthcareInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MolinaHealthcareInc.Member" xlink:to="lab_cost_MolinaHealthcareInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MongoDBInc.Member_label_en-US" xlink:label="lab_cost_MongoDBInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">MongoDB Inc. [Member]</link:label>
    <link:label id="lab_cost_MongoDBInc.Member_documentation_en-US" xlink:label="lab_cost_MongoDBInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">MongoDB Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MongoDBInc.Member" xlink:href="cost-20251231.xsd#cost_MongoDBInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MongoDBInc.Member" xlink:to="lab_cost_MongoDBInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MonolithicPowerSystemsInc.Member_label_en-US" xlink:label="lab_cost_MonolithicPowerSystemsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Monolithic Power Systems Inc. [Member]</link:label>
    <link:label id="lab_cost_MonolithicPowerSystemsInc.Member_documentation_en-US" xlink:label="lab_cost_MonolithicPowerSystemsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Monolithic Power Systems Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MonolithicPowerSystemsInc.Member" xlink:href="cost-20251231.xsd#cost_MonolithicPowerSystemsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MonolithicPowerSystemsInc.Member" xlink:to="lab_cost_MonolithicPowerSystemsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MSCIInc.Member_label_en-US" xlink:label="lab_cost_MSCIInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">MSCI Inc. [Member]</link:label>
    <link:label id="lab_cost_MSCIInc.Member_documentation_en-US" xlink:label="lab_cost_MSCIInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">MSCI Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MSCIInc.Member" xlink:href="cost-20251231.xsd#cost_MSCIInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MSCIInc.Member" xlink:to="lab_cost_MSCIInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_NateraInc.Member_label_en-US" xlink:label="lab_cost_NateraInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Natera Inc. [Member]</link:label>
    <link:label id="lab_cost_NateraInc.Member_documentation_en-US" xlink:label="lab_cost_NateraInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Natera Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_NateraInc.Member" xlink:href="cost-20251231.xsd#cost_NateraInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_NateraInc.Member" xlink:to="lab_cost_NateraInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_NetskopeInc.ClassAMember_label_en-US" xlink:label="lab_cost_NetskopeInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Netskope Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_NetskopeInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_NetskopeInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Netskope Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_NetskopeInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_NetskopeInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_NetskopeInc.ClassAMember" xlink:to="lab_cost_NetskopeInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_NewYorkTimesCo.ClassAMember_label_en-US" xlink:label="lab_cost_NewYorkTimesCo.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">New York Times Co., Class A [Member]</link:label>
    <link:label id="lab_cost_NewYorkTimesCo.ClassAMember_documentation_en-US" xlink:label="lab_cost_NewYorkTimesCo.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">New York Times Co., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_NewYorkTimesCo.ClassAMember" xlink:href="cost-20251231.xsd#cost_NewYorkTimesCo.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_NewYorkTimesCo.ClassAMember" xlink:to="lab_cost_NewYorkTimesCo.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_NuvalentInc.ClassAMember_label_en-US" xlink:label="lab_cost_NuvalentInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nuvalent Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_NuvalentInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_NuvalentInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Nuvalent Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_NuvalentInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_NuvalentInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_NuvalentInc.ClassAMember" xlink:to="lab_cost_NuvalentInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_OldDominionFreightLineInc.Member_label_en-US" xlink:label="lab_cost_OldDominionFreightLineInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Old Dominion Freight Line Inc. [Member]</link:label>
    <link:label id="lab_cost_OldDominionFreightLineInc.Member_documentation_en-US" xlink:label="lab_cost_OldDominionFreightLineInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Old Dominion Freight Line Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_OldDominionFreightLineInc.Member" xlink:href="cost-20251231.xsd#cost_OldDominionFreightLineInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_OldDominionFreightLineInc.Member" xlink:to="lab_cost_OldDominionFreightLineInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_OnestreamInc.ClassAMember_label_en-US" xlink:label="lab_cost_OnestreamInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Onestream Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_OnestreamInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_OnestreamInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Onestream Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_OnestreamInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_OnestreamInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_OnestreamInc.ClassAMember" xlink:to="lab_cost_OnestreamInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_PaylocityHoldingCorp.Member_label_en-US" xlink:label="lab_cost_PaylocityHoldingCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Paylocity Holding Corp. [Member]</link:label>
    <link:label id="lab_cost_PaylocityHoldingCorp.Member_documentation_en-US" xlink:label="lab_cost_PaylocityHoldingCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Paylocity Holding Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_PaylocityHoldingCorp.Member" xlink:href="cost-20251231.xsd#cost_PaylocityHoldingCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_PaylocityHoldingCorp.Member" xlink:to="lab_cost_PaylocityHoldingCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_PlanetFitnessInc.ClassAMember_label_en-US" xlink:label="lab_cost_PlanetFitnessInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Planet Fitness Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_PlanetFitnessInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_PlanetFitnessInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Planet Fitness Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_PlanetFitnessInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_PlanetFitnessInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_PlanetFitnessInc.ClassAMember" xlink:to="lab_cost_PlanetFitnessInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_PoolCorporationMember_label_en-US" xlink:label="lab_cost_PoolCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pool Corporation [Member]</link:label>
    <link:label id="lab_cost_PoolCorporationMember_documentation_en-US" xlink:label="lab_cost_PoolCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Pool Corporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_PoolCorporationMember" xlink:href="cost-20251231.xsd#cost_PoolCorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_PoolCorporationMember" xlink:to="lab_cost_PoolCorporationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_PTCInc.Member_label_en-US" xlink:label="lab_cost_PTCInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PTC Inc. [Member]</link:label>
    <link:label id="lab_cost_PTCInc.Member_documentation_en-US" xlink:label="lab_cost_PTCInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">PTC Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_PTCInc.Member" xlink:href="cost-20251231.xsd#cost_PTCInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_PTCInc.Member" xlink:to="lab_cost_PTCInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_QuantaServicesInc.Member_label_en-US" xlink:label="lab_cost_QuantaServicesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Quanta Services Inc. [Member]</link:label>
    <link:label id="lab_cost_QuantaServicesInc.Member_documentation_en-US" xlink:label="lab_cost_QuantaServicesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Quanta Services Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_QuantaServicesInc.Member" xlink:href="cost-20251231.xsd#cost_QuantaServicesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_QuantaServicesInc.Member" xlink:to="lab_cost_QuantaServicesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_QuidelorthoCorp.Member_label_en-US" xlink:label="lab_cost_QuidelorthoCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Quidelortho Corp. [Member]</link:label>
    <link:label id="lab_cost_QuidelorthoCorp.Member_documentation_en-US" xlink:label="lab_cost_QuidelorthoCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Quidelortho Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_QuidelorthoCorp.Member" xlink:href="cost-20251231.xsd#cost_QuidelorthoCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_QuidelorthoCorp.Member" xlink:to="lab_cost_QuidelorthoCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_RalliantCorporationMember_label_en-US" xlink:label="lab_cost_RalliantCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ralliant Corporation [Member]</link:label>
    <link:label id="lab_cost_RalliantCorporationMember_documentation_en-US" xlink:label="lab_cost_RalliantCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Ralliant Corporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_RalliantCorporationMember" xlink:href="cost-20251231.xsd#cost_RalliantCorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_RalliantCorporationMember" xlink:to="lab_cost_RalliantCorporationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_RaymondJamesFinancialInc.Member_label_en-US" xlink:label="lab_cost_RaymondJamesFinancialInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Raymond James Financial Inc. [Member]</link:label>
    <link:label id="lab_cost_RaymondJamesFinancialInc.Member_documentation_en-US" xlink:label="lab_cost_RaymondJamesFinancialInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Raymond James Financial Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_RaymondJamesFinancialInc.Member" xlink:href="cost-20251231.xsd#cost_RaymondJamesFinancialInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_RaymondJamesFinancialInc.Member" xlink:to="lab_cost_RaymondJamesFinancialInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_RedditInc.ClassAMember_label_en-US" xlink:label="lab_cost_RedditInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reddit Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_RedditInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_RedditInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Reddit Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_RedditInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_RedditInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_RedditInc.ClassAMember" xlink:to="lab_cost_RedditInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_RevolutionMedicinesInc.Member_label_en-US" xlink:label="lab_cost_RevolutionMedicinesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revolution Medicines Inc. [Member]</link:label>
    <link:label id="lab_cost_RevolutionMedicinesInc.Member_documentation_en-US" xlink:label="lab_cost_RevolutionMedicinesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Revolution Medicines Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_RevolutionMedicinesInc.Member" xlink:href="cost-20251231.xsd#cost_RevolutionMedicinesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_RevolutionMedicinesInc.Member" xlink:to="lab_cost_RevolutionMedicinesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_RossStoresInc.Member_label_en-US" xlink:label="lab_cost_RossStoresInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ross Stores Inc. [Member]</link:label>
    <link:label id="lab_cost_RossStoresInc.Member_documentation_en-US" xlink:label="lab_cost_RossStoresInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Ross Stores Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_RossStoresInc.Member" xlink:href="cost-20251231.xsd#cost_RossStoresInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_RossStoresInc.Member" xlink:to="lab_cost_RossStoresInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_RyanSpecialtyHoldingsInc.ClassAMember_label_en-US" xlink:label="lab_cost_RyanSpecialtyHoldingsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ryan Specialty Holdings Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_RyanSpecialtyHoldingsInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_RyanSpecialtyHoldingsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Ryan Specialty Holdings Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_RyanSpecialtyHoldingsInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_RyanSpecialtyHoldingsInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_RyanSpecialtyHoldingsInc.ClassAMember" xlink:to="lab_cost_RyanSpecialtyHoldingsInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ServiceCorporationInternationalMember_label_en-US" xlink:label="lab_cost_ServiceCorporationInternationalMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Service Corporation International [Member]</link:label>
    <link:label id="lab_cost_ServiceCorporationInternationalMember_documentation_en-US" xlink:label="lab_cost_ServiceCorporationInternationalMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Service Corporation International</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ServiceCorporationInternationalMember" xlink:href="cost-20251231.xsd#cost_ServiceCorporationInternationalMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ServiceCorporationInternationalMember" xlink:to="lab_cost_ServiceCorporationInternationalMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_StandardAeroInc.Member_label_en-US" xlink:label="lab_cost_StandardAeroInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">StandardAero Inc. [Member]</link:label>
    <link:label id="lab_cost_StandardAeroInc.Member_documentation_en-US" xlink:label="lab_cost_StandardAeroInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">StandardAero Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_StandardAeroInc.Member" xlink:href="cost-20251231.xsd#cost_StandardAeroInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_StandardAeroInc.Member" xlink:to="lab_cost_StandardAeroInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TeleflexInc.Member_label_en-US" xlink:label="lab_cost_TeleflexInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Teleflex Inc. [Member]</link:label>
    <link:label id="lab_cost_TeleflexInc.Member_documentation_en-US" xlink:label="lab_cost_TeleflexInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Teleflex Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TeleflexInc.Member" xlink:href="cost-20251231.xsd#cost_TeleflexInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TeleflexInc.Member" xlink:to="lab_cost_TeleflexInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TexasRoadhouseInc.Member_label_en-US" xlink:label="lab_cost_TexasRoadhouseInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Texas Roadhouse Inc. [Member]</link:label>
    <link:label id="lab_cost_TexasRoadhouseInc.Member_documentation_en-US" xlink:label="lab_cost_TexasRoadhouseInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Texas Roadhouse Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TexasRoadhouseInc.Member" xlink:href="cost-20251231.xsd#cost_TexasRoadhouseInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TexasRoadhouseInc.Member" xlink:to="lab_cost_TexasRoadhouseInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TextronInc.Member_label_en-US" xlink:label="lab_cost_TextronInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Textron Inc. [Member]</link:label>
    <link:label id="lab_cost_TextronInc.Member_documentation_en-US" xlink:label="lab_cost_TextronInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Textron Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TextronInc.Member" xlink:href="cost-20251231.xsd#cost_TextronInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TextronInc.Member" xlink:to="lab_cost_TextronInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TheCooperCompaniesInc.Member_label_en-US" xlink:label="lab_cost_TheCooperCompaniesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">The Cooper Companies Inc. [Member]</link:label>
    <link:label id="lab_cost_TheCooperCompaniesInc.Member_documentation_en-US" xlink:label="lab_cost_TheCooperCompaniesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The Cooper Companies Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TheCooperCompaniesInc.Member" xlink:href="cost-20251231.xsd#cost_TheCooperCompaniesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TheCooperCompaniesInc.Member" xlink:to="lab_cost_TheCooperCompaniesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ToastInc.ClassAMember_label_en-US" xlink:label="lab_cost_ToastInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Toast Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_ToastInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_ToastInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Toast Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ToastInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_ToastInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ToastInc.ClassAMember" xlink:to="lab_cost_ToastInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TopBuildCorp.Member_label_en-US" xlink:label="lab_cost_TopBuildCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">TopBuild Corp. [Member]</link:label>
    <link:label id="lab_cost_TopBuildCorp.Member_documentation_en-US" xlink:label="lab_cost_TopBuildCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">TopBuild Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TopBuildCorp.Member" xlink:href="cost-20251231.xsd#cost_TopBuildCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TopBuildCorp.Member" xlink:to="lab_cost_TopBuildCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TPGInc.ClassAMember_label_en-US" xlink:label="lab_cost_TPGInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">TPG Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_TPGInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_TPGInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">TPG Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TPGInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_TPGInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TPGInc.ClassAMember" xlink:to="lab_cost_TPGInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TradeDeskIncTheClassAMember_label_en-US" xlink:label="lab_cost_TradeDeskIncTheClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trade Desk Inc/The, Class A [Member]</link:label>
    <link:label id="lab_cost_TradeDeskIncTheClassAMember_documentation_en-US" xlink:label="lab_cost_TradeDeskIncTheClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Trade Desk Inc/The, Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TradeDeskIncTheClassAMember" xlink:href="cost-20251231.xsd#cost_TradeDeskIncTheClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TradeDeskIncTheClassAMember" xlink:to="lab_cost_TradeDeskIncTheClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TradewebMarketsInc.ClassAMember_label_en-US" xlink:label="lab_cost_TradewebMarketsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Tradeweb Markets Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_TradewebMarketsInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_TradewebMarketsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tradeweb Markets Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TradewebMarketsInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_TradewebMarketsInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TradewebMarketsInc.ClassAMember" xlink:to="lab_cost_TradewebMarketsInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TransunionMember_label_en-US" xlink:label="lab_cost_TransunionMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Transunion [Member]</link:label>
    <link:label id="lab_cost_TransunionMember_documentation_en-US" xlink:label="lab_cost_TransunionMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Transunion</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TransunionMember" xlink:href="cost-20251231.xsd#cost_TransunionMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TransunionMember" xlink:to="lab_cost_TransunionMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TylerTechnologiesInc.Member_label_en-US" xlink:label="lab_cost_TylerTechnologiesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Tyler Technologies Inc. [Member]</link:label>
    <link:label id="lab_cost_TylerTechnologiesInc.Member_documentation_en-US" xlink:label="lab_cost_TylerTechnologiesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tyler Technologies Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TylerTechnologiesInc.Member" xlink:href="cost-20251231.xsd#cost_TylerTechnologiesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TylerTechnologiesInc.Member" xlink:to="lab_cost_TylerTechnologiesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ULSolutionsInc.ClassAMember_label_en-US" xlink:label="lab_cost_ULSolutionsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">UL Solutions Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_ULSolutionsInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_ULSolutionsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">UL Solutions Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ULSolutionsInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_ULSolutionsInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ULSolutionsInc.ClassAMember" xlink:to="lab_cost_ULSolutionsInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_UltaBeautyInc.Member_label_en-US" xlink:label="lab_cost_UltaBeautyInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ulta Beauty Inc. [Member]</link:label>
    <link:label id="lab_cost_UltaBeautyInc.Member_documentation_en-US" xlink:label="lab_cost_UltaBeautyInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Ulta Beauty Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_UltaBeautyInc.Member" xlink:href="cost-20251231.xsd#cost_UltaBeautyInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_UltaBeautyInc.Member" xlink:to="lab_cost_UltaBeautyInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_UnitySoftwareInc.Member_label_en-US" xlink:label="lab_cost_UnitySoftwareInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unity Software Inc. [Member]</link:label>
    <link:label id="lab_cost_UnitySoftwareInc.Member_documentation_en-US" xlink:label="lab_cost_UnitySoftwareInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Unity Software Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_UnitySoftwareInc.Member" xlink:href="cost-20251231.xsd#cost_UnitySoftwareInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_UnitySoftwareInc.Member" xlink:to="lab_cost_UnitySoftwareInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_VaxcyteInc.Member_label_en-US" xlink:label="lab_cost_VaxcyteInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Vaxcyte Inc. [Member]</link:label>
    <link:label id="lab_cost_VaxcyteInc.Member_documentation_en-US" xlink:label="lab_cost_VaxcyteInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Vaxcyte Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_VaxcyteInc.Member" xlink:href="cost-20251231.xsd#cost_VaxcyteInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_VaxcyteInc.Member" xlink:to="lab_cost_VaxcyteInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_VeevaSystemsInc.ClassAMember_label_en-US" xlink:label="lab_cost_VeevaSystemsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Veeva Systems Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_VeevaSystemsInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_VeevaSystemsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Veeva Systems Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_VeevaSystemsInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_VeevaSystemsInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_VeevaSystemsInc.ClassAMember" xlink:to="lab_cost_VeevaSystemsInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_VeraltoCorp.Member_label_en-US" xlink:label="lab_cost_VeraltoCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Veralto Corp. [Member]</link:label>
    <link:label id="lab_cost_VeraltoCorp.Member_documentation_en-US" xlink:label="lab_cost_VeraltoCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Veralto Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_VeraltoCorp.Member" xlink:href="cost-20251231.xsd#cost_VeraltoCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_VeraltoCorp.Member" xlink:to="lab_cost_VeraltoCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_WestPharmaceuticalServicesMember_label_en-US" xlink:label="lab_cost_WestPharmaceuticalServicesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">West Pharmaceutical Services [Member]</link:label>
    <link:label id="lab_cost_WestPharmaceuticalServicesMember_documentation_en-US" xlink:label="lab_cost_WestPharmaceuticalServicesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">West Pharmaceutical Services</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_WestPharmaceuticalServicesMember" xlink:href="cost-20251231.xsd#cost_WestPharmaceuticalServicesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_WestPharmaceuticalServicesMember" xlink:to="lab_cost_WestPharmaceuticalServicesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_WingstopInc.Member_label_en-US" xlink:label="lab_cost_WingstopInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Wingstop Inc. [Member]</link:label>
    <link:label id="lab_cost_WingstopInc.Member_documentation_en-US" xlink:label="lab_cost_WingstopInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Wingstop Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_WingstopInc.Member" xlink:href="cost-20251231.xsd#cost_WingstopInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_WingstopInc.Member" xlink:to="lab_cost_WingstopInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_WyndhamHotelsResortsInc.Member_label_en-US" xlink:label="lab_cost_WyndhamHotelsResortsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Wyndham Hotels &amp; Resorts Inc. [Member]</link:label>
    <link:label id="lab_cost_WyndhamHotelsResortsInc.Member_documentation_en-US" xlink:label="lab_cost_WyndhamHotelsResortsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Wyndham Hotels &amp; Resorts Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_WyndhamHotelsResortsInc.Member" xlink:href="cost-20251231.xsd#cost_WyndhamHotelsResortsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_WyndhamHotelsResortsInc.Member" xlink:to="lab_cost_WyndhamHotelsResortsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_XPOInc.Member_label_en-US" xlink:label="lab_cost_XPOInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">XPO Inc. [Member]</link:label>
    <link:label id="lab_cost_XPOInc.Member_documentation_en-US" xlink:label="lab_cost_XPOInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">XPO Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_XPOInc.Member" xlink:href="cost-20251231.xsd#cost_XPOInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_XPOInc.Member" xlink:to="lab_cost_XPOInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_YumBrandsInc.Member_label_en-US" xlink:label="lab_cost_YumBrandsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Yum! Brands Inc. [Member]</link:label>
    <link:label id="lab_cost_YumBrandsInc.Member_documentation_en-US" xlink:label="lab_cost_YumBrandsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Yum! Brands Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_YumBrandsInc.Member" xlink:href="cost-20251231.xsd#cost_YumBrandsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_YumBrandsInc.Member" xlink:to="lab_cost_YumBrandsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ZoomCommunicationsInc.Member_label_en-US" xlink:label="lab_cost_ZoomCommunicationsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Zoom Communications Inc. [Member]</link:label>
    <link:label id="lab_cost_ZoomCommunicationsInc.Member_documentation_en-US" xlink:label="lab_cost_ZoomCommunicationsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Zoom Communications Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ZoomCommunicationsInc.Member" xlink:href="cost-20251231.xsd#cost_ZoomCommunicationsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ZoomCommunicationsInc.Member" xlink:to="lab_cost_ZoomCommunicationsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ZscalerInc.Member_label_en-US" xlink:label="lab_cost_ZscalerInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Zscaler Inc. [Member]</link:label>
    <link:label id="lab_cost_ZscalerInc.Member_documentation_en-US" xlink:label="lab_cost_ZscalerInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Zscaler Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ZscalerInc.Member" xlink:href="cost-20251231.xsd#cost_ZscalerInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ZscalerInc.Member" xlink:to="lab_cost_ZscalerInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AlconAGMember_label_en-US" xlink:label="lab_cost_AlconAGMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Alcon AG [Member]</link:label>
    <link:label id="lab_cost_AlconAGMember_documentation_en-US" xlink:label="lab_cost_AlconAGMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Alcon AG</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AlconAGMember" xlink:href="cost-20251231.xsd#cost_AlconAGMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AlconAGMember" xlink:to="lab_cost_AlconAGMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AscendisPharmaMember_label_en-US" xlink:label="lab_cost_AscendisPharmaMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ascendis Pharma [Member]</link:label>
    <link:label id="lab_cost_AscendisPharmaMember_documentation_en-US" xlink:label="lab_cost_AscendisPharmaMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Ascendis Pharma</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AscendisPharmaMember" xlink:href="cost-20251231.xsd#cost_AscendisPharmaMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AscendisPharmaMember" xlink:to="lab_cost_AscendisPharmaMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BendingSpoonsS.p.A.ClassMember_label_en-US" xlink:label="lab_cost_BendingSpoonsS.p.A.ClassMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Bending Spoons S.p.A., Class [Member]</link:label>
    <link:label id="lab_cost_BendingSpoonsS.p.A.ClassMember_documentation_en-US" xlink:label="lab_cost_BendingSpoonsS.p.A.ClassMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Bending Spoons S.p.A., Class</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BendingSpoonsS.p.A.ClassMember" xlink:href="cost-20251231.xsd#cost_BendingSpoonsS.p.A.ClassMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BendingSpoonsS.p.A.ClassMember" xlink:to="lab_cost_BendingSpoonsS.p.A.ClassMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BioNTechSEMember_label_en-US" xlink:label="lab_cost_BioNTechSEMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">BioNTech SE [Member]</link:label>
    <link:label id="lab_cost_BioNTechSEMember_documentation_en-US" xlink:label="lab_cost_BioNTechSEMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">BioNTech SE</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BioNTechSEMember" xlink:href="cost-20251231.xsd#cost_BioNTechSEMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BioNTechSEMember" xlink:to="lab_cost_BioNTechSEMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BrikenstockHoldingPLCMember_label_en-US" xlink:label="lab_cost_BrikenstockHoldingPLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Brikenstock Holding PLC [Member]</link:label>
    <link:label id="lab_cost_BrikenstockHoldingPLCMember_documentation_en-US" xlink:label="lab_cost_BrikenstockHoldingPLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Brikenstock Holding PLC</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BrikenstockHoldingPLCMember" xlink:href="cost-20251231.xsd#cost_BrikenstockHoldingPLCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BrikenstockHoldingPLCMember" xlink:to="lab_cost_BrikenstockHoldingPLCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BullishMember_label_en-US" xlink:label="lab_cost_BullishMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Bullish [Member]</link:label>
    <link:label id="lab_cost_BullishMember_documentation_en-US" xlink:label="lab_cost_BullishMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Bullish</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BullishMember" xlink:href="cost-20251231.xsd#cost_BullishMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BullishMember" xlink:to="lab_cost_BullishMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CrisprTherapeuticsAGMember_label_en-US" xlink:label="lab_cost_CrisprTherapeuticsAGMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Crispr Therapeutics AG [Member]</link:label>
    <link:label id="lab_cost_CrisprTherapeuticsAGMember_documentation_en-US" xlink:label="lab_cost_CrisprTherapeuticsAGMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Crispr Therapeutics AG</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CrisprTherapeuticsAGMember" xlink:href="cost-20251231.xsd#cost_CrisprTherapeuticsAGMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CrisprTherapeuticsAGMember" xlink:to="lab_cost_CrisprTherapeuticsAGMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ESABCorp.Member_label_en-US" xlink:label="lab_cost_ESABCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ESAB Corp. [Member]</link:label>
    <link:label id="lab_cost_ESABCorp.Member_documentation_en-US" xlink:label="lab_cost_ESABCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ESAB Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ESABCorp.Member" xlink:href="cost-20251231.xsd#cost_ESABCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ESABCorp.Member" xlink:to="lab_cost_ESABCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_FergusonEnterprisesInc.ParMember_label_en-US" xlink:label="lab_cost_FergusonEnterprisesInc.ParMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ferguson Enterprises Inc. Par [Member]</link:label>
    <link:label id="lab_cost_FergusonEnterprisesInc.ParMember_documentation_en-US" xlink:label="lab_cost_FergusonEnterprisesInc.ParMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Ferguson Enterprises Inc. Par</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_FergusonEnterprisesInc.ParMember" xlink:href="cost-20251231.xsd#cost_FergusonEnterprisesInc.ParMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_FergusonEnterprisesInc.ParMember" xlink:to="lab_cost_FergusonEnterprisesInc.ParMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_Monday.comLtd.Member_label_en-US" xlink:label="lab_cost_Monday.comLtd.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Monday.com Ltd. [Member]</link:label>
    <link:label id="lab_cost_Monday.comLtd.Member_documentation_en-US" xlink:label="lab_cost_Monday.comLtd.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Monday.com Ltd.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_Monday.comLtd.Member" xlink:href="cost-20251231.xsd#cost_Monday.comLtd.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_Monday.comLtd.Member" xlink:to="lab_cost_Monday.comLtd.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_NXPSemiconductorsN.V.Member_label_en-US" xlink:label="lab_cost_NXPSemiconductorsN.V.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">NXP Semiconductors N.V. [Member]</link:label>
    <link:label id="lab_cost_NXPSemiconductorsN.V.Member_documentation_en-US" xlink:label="lab_cost_NXPSemiconductorsN.V.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">NXP Semiconductors N.V.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_NXPSemiconductorsN.V.Member" xlink:href="cost-20251231.xsd#cost_NXPSemiconductorsN.V.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_NXPSemiconductorsN.V.Member" xlink:to="lab_cost_NXPSemiconductorsN.V.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_OnHoldingAGClassAMember_label_en-US" xlink:label="lab_cost_OnHoldingAGClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">On Holding AG, Class A [Member]</link:label>
    <link:label id="lab_cost_OnHoldingAGClassAMember_documentation_en-US" xlink:label="lab_cost_OnHoldingAGClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">On Holding AG, Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_OnHoldingAGClassAMember" xlink:href="cost-20251231.xsd#cost_OnHoldingAGClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_OnHoldingAGClassAMember" xlink:to="lab_cost_OnHoldingAGClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_RBGlobalInc.Member_label_en-US" xlink:label="lab_cost_RBGlobalInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">RB Global Inc. [Member]</link:label>
    <link:label id="lab_cost_RBGlobalInc.Member_documentation_en-US" xlink:label="lab_cost_RBGlobalInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">RB Global Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_RBGlobalInc.Member" xlink:href="cost-20251231.xsd#cost_RBGlobalInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_RBGlobalInc.Member" xlink:to="lab_cost_RBGlobalInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_SportradarGroupAGMember_label_en-US" xlink:label="lab_cost_SportradarGroupAGMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sportradar Group AG [Member]</link:label>
    <link:label id="lab_cost_SportradarGroupAGMember_documentation_en-US" xlink:label="lab_cost_SportradarGroupAGMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Sportradar Group AG</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_SportradarGroupAGMember" xlink:href="cost-20251231.xsd#cost_SportradarGroupAGMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_SportradarGroupAGMember" xlink:to="lab_cost_SportradarGroupAGMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TechnipFMCPLCMember_label_en-US" xlink:label="lab_cost_TechnipFMCPLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">TechnipFMC PLC [Member]</link:label>
    <link:label id="lab_cost_TechnipFMCPLCMember_documentation_en-US" xlink:label="lab_cost_TechnipFMCPLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">TechnipFMC PLC</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TechnipFMCPLCMember" xlink:href="cost-20251231.xsd#cost_TechnipFMCPLCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TechnipFMCPLCMember" xlink:to="lab_cost_TechnipFMCPLCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_VikingHoldingsLtd.Member_label_en-US" xlink:label="lab_cost_VikingHoldingsLtd.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Viking Holdings Ltd. [Member]</link:label>
    <link:label id="lab_cost_VikingHoldingsLtd.Member_documentation_en-US" xlink:label="lab_cost_VikingHoldingsLtd.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Viking Holdings Ltd.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_VikingHoldingsLtd.Member" xlink:href="cost-20251231.xsd#cost_VikingHoldingsLtd.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_VikingHoldingsLtd.Member" xlink:to="lab_cost_VikingHoldingsLtd.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_DatabricksSeriesHConvertibleMember_label_en-US" xlink:label="lab_cost_DatabricksSeriesHConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Databricks, Series H Convertible [Member]</link:label>
    <link:label id="lab_cost_DatabricksSeriesHConvertibleMember_documentation_en-US" xlink:label="lab_cost_DatabricksSeriesHConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Databricks, Series H Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_DatabricksSeriesHConvertibleMember" xlink:href="cost-20251231.xsd#cost_DatabricksSeriesHConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_DatabricksSeriesHConvertibleMember" xlink:to="lab_cost_DatabricksSeriesHConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PreferredStockMember_label_en-US" xlink:label="lab_us-gaap_PreferredStockMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Preferred Stock [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PreferredStockMember" xlink:to="lab_us-gaap_PreferredStockMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_DatabricksSeriesIConvertibleMember_label_en-US" xlink:label="lab_cost_DatabricksSeriesIConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Databricks, Series I Convertible [Member]</link:label>
    <link:label id="lab_cost_DatabricksSeriesIConvertibleMember_documentation_en-US" xlink:label="lab_cost_DatabricksSeriesIConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Databricks, Series I Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_DatabricksSeriesIConvertibleMember" xlink:href="cost-20251231.xsd#cost_DatabricksSeriesIConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_DatabricksSeriesIConvertibleMember" xlink:to="lab_cost_DatabricksSeriesIConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_NuroInc.SeriesDMember_label_en-US" xlink:label="lab_cost_NuroInc.SeriesDMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nuro Inc., Series D [Member]</link:label>
    <link:label id="lab_cost_NuroInc.SeriesDMember_documentation_en-US" xlink:label="lab_cost_NuroInc.SeriesDMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Nuro Inc., Series D</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_NuroInc.SeriesDMember" xlink:href="cost-20251231.xsd#cost_NuroInc.SeriesDMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_NuroInc.SeriesDMember" xlink:to="lab_cost_NuroInc.SeriesDMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_RedwoodMaterialsInc.SeriesCMember_label_en-US" xlink:label="lab_cost_RedwoodMaterialsInc.SeriesCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Redwood Materials Inc., Series C [Member]</link:label>
    <link:label id="lab_cost_RedwoodMaterialsInc.SeriesCMember_documentation_en-US" xlink:label="lab_cost_RedwoodMaterialsInc.SeriesCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Redwood Materials Inc., Series C</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_RedwoodMaterialsInc.SeriesCMember" xlink:href="cost-20251231.xsd#cost_RedwoodMaterialsInc.SeriesCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_RedwoodMaterialsInc.SeriesCMember" xlink:to="lab_cost_RedwoodMaterialsInc.SeriesCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_SilaNanotechnologiesInc.SeriesFMember_label_en-US" xlink:label="lab_cost_SilaNanotechnologiesInc.SeriesFMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sila Nanotechnologies Inc., Series F [Member]</link:label>
    <link:label id="lab_cost_SilaNanotechnologiesInc.SeriesFMember_documentation_en-US" xlink:label="lab_cost_SilaNanotechnologiesInc.SeriesFMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Sila Nanotechnologies Inc., Series F</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_SilaNanotechnologiesInc.SeriesFMember" xlink:href="cost-20251231.xsd#cost_SilaNanotechnologiesInc.SeriesFMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_SilaNanotechnologiesInc.SeriesFMember" xlink:to="lab_cost_SilaNanotechnologiesInc.SeriesFMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_DatabricksSeriesJMember_label_en-US" xlink:label="lab_cost_DatabricksSeriesJMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Databricks, Series J [Member]</link:label>
    <link:label id="lab_cost_DatabricksSeriesJMember_documentation_en-US" xlink:label="lab_cost_DatabricksSeriesJMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Databricks, Series J</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_DatabricksSeriesJMember" xlink:href="cost-20251231.xsd#cost_DatabricksSeriesJMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_DatabricksSeriesJMember" xlink:to="lab_cost_DatabricksSeriesJMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_EquitySecuritiesMember_label_en-US" xlink:label="lab_us-gaap_EquitySecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Securities [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EquitySecuritiesMember" xlink:to="lab_us-gaap_EquitySecuritiesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_NorthernInstitutionalTreasuryPortfolioMember_label_en-US" xlink:label="lab_cost_NorthernInstitutionalTreasuryPortfolioMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Northern Institutional Treasury Portfolio [Member]</link:label>
    <link:label id="lab_cost_NorthernInstitutionalTreasuryPortfolioMember_documentation_en-US" xlink:label="lab_cost_NorthernInstitutionalTreasuryPortfolioMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Northern Institutional Treasury Portfolio</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_NorthernInstitutionalTreasuryPortfolioMember" xlink:href="cost-20251231.xsd#cost_NorthernInstitutionalTreasuryPortfolioMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_NorthernInstitutionalTreasuryPortfolioMember" xlink:to="lab_cost_NorthernInstitutionalTreasuryPortfolioMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_MoneyMarketFundsMember_label_en-US" xlink:label="lab_us-gaap_MoneyMarketFundsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Money Market Funds [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MoneyMarketFundsMember" xlink:to="lab_us-gaap_MoneyMarketFundsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_T.RowePriceTreasuryReserveFundMember_label_en-US" xlink:label="lab_cost_T.RowePriceTreasuryReserveFundMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">T. Rowe Price Treasury Reserve Fund [Member]</link:label>
    <link:label id="lab_cost_T.RowePriceTreasuryReserveFundMember_documentation_en-US" xlink:label="lab_cost_T.RowePriceTreasuryReserveFundMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">T. Rowe Price Treasury Reserve Fund</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_T.RowePriceTreasuryReserveFundMember" xlink:href="cost-20251231.xsd#cost_T.RowePriceTreasuryReserveFundMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_T.RowePriceTreasuryReserveFundMember" xlink:to="lab_cost_T.RowePriceTreasuryReserveFundMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AbbottLaboratoriesMember_label_en-US" xlink:label="lab_cost_AbbottLaboratoriesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Abbott Laboratories [Member]</link:label>
    <link:label id="lab_cost_AbbottLaboratoriesMember_documentation_en-US" xlink:label="lab_cost_AbbottLaboratoriesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Abbott Laboratories</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AbbottLaboratoriesMember" xlink:href="cost-20251231.xsd#cost_AbbottLaboratoriesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AbbottLaboratoriesMember" xlink:to="lab_cost_AbbottLaboratoriesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AllstateCorp.Member_label_en-US" xlink:label="lab_cost_AllstateCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Allstate Corp. [Member]</link:label>
    <link:label id="lab_cost_AllstateCorp.Member_documentation_en-US" xlink:label="lab_cost_AllstateCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Allstate Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AllstateCorp.Member" xlink:href="cost-20251231.xsd#cost_AllstateCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AllstateCorp.Member" xlink:to="lab_cost_AllstateCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AlphabetInc.ClassAMember_label_en-US" xlink:label="lab_cost_AlphabetInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Alphabet Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_AlphabetInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_AlphabetInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Alphabet Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AlphabetInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_AlphabetInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AlphabetInc.ClassAMember" xlink:to="lab_cost_AlphabetInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AlphabetInc.ClassCMember_label_en-US" xlink:label="lab_cost_AlphabetInc.ClassCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Alphabet Inc., Class C [Member]</link:label>
    <link:label id="lab_cost_AlphabetInc.ClassCMember_documentation_en-US" xlink:label="lab_cost_AlphabetInc.ClassCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Alphabet Inc., Class C</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AlphabetInc.ClassCMember" xlink:href="cost-20251231.xsd#cost_AlphabetInc.ClassCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AlphabetInc.ClassCMember" xlink:to="lab_cost_AlphabetInc.ClassCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_Amazon.comInc.Member_label_en-US" xlink:label="lab_cost_Amazon.comInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amazon.com Inc. [Member]</link:label>
    <link:label id="lab_cost_Amazon.comInc.Member_documentation_en-US" xlink:label="lab_cost_Amazon.comInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amazon.com Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_Amazon.comInc.Member" xlink:href="cost-20251231.xsd#cost_Amazon.comInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_Amazon.comInc.Member" xlink:to="lab_cost_Amazon.comInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AmerenCorporationMember_label_en-US" xlink:label="lab_cost_AmerenCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ameren Corporation [Member]</link:label>
    <link:label id="lab_cost_AmerenCorporationMember_documentation_en-US" xlink:label="lab_cost_AmerenCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Ameren Corporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AmerenCorporationMember" xlink:href="cost-20251231.xsd#cost_AmerenCorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AmerenCorporationMember" xlink:to="lab_cost_AmerenCorporationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AmericanExpressCompanyMember_label_en-US" xlink:label="lab_cost_AmericanExpressCompanyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">American Express Company [Member]</link:label>
    <link:label id="lab_cost_AmericanExpressCompanyMember_documentation_en-US" xlink:label="lab_cost_AmericanExpressCompanyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">American Express Company</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AmericanExpressCompanyMember" xlink:href="cost-20251231.xsd#cost_AmericanExpressCompanyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AmericanExpressCompanyMember" xlink:to="lab_cost_AmericanExpressCompanyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AmetekInc.Member_label_en-US" xlink:label="lab_cost_AmetekInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ametek Inc. [Member]</link:label>
    <link:label id="lab_cost_AmetekInc.Member_documentation_en-US" xlink:label="lab_cost_AmetekInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Ametek Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AmetekInc.Member" xlink:href="cost-20251231.xsd#cost_AmetekInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AmetekInc.Member" xlink:to="lab_cost_AmetekInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AnalogDevicesInc.Member_label_en-US" xlink:label="lab_cost_AnalogDevicesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Analog Devices Inc. [Member]</link:label>
    <link:label id="lab_cost_AnalogDevicesInc.Member_documentation_en-US" xlink:label="lab_cost_AnalogDevicesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Analog Devices Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AnalogDevicesInc.Member" xlink:href="cost-20251231.xsd#cost_AnalogDevicesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AnalogDevicesInc.Member" xlink:to="lab_cost_AnalogDevicesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AnnalyCapitalManagementInc.Member_label_en-US" xlink:label="lab_cost_AnnalyCapitalManagementInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Annaly Capital Management Inc. [Member]</link:label>
    <link:label id="lab_cost_AnnalyCapitalManagementInc.Member_documentation_en-US" xlink:label="lab_cost_AnnalyCapitalManagementInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Annaly Capital Management Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AnnalyCapitalManagementInc.Member" xlink:href="cost-20251231.xsd#cost_AnnalyCapitalManagementInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AnnalyCapitalManagementInc.Member" xlink:to="lab_cost_AnnalyCapitalManagementInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ApolloGlobalManagementInc.Member_label_en-US" xlink:label="lab_cost_ApolloGlobalManagementInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Apollo Global Management Inc. [Member]</link:label>
    <link:label id="lab_cost_ApolloGlobalManagementInc.Member_documentation_en-US" xlink:label="lab_cost_ApolloGlobalManagementInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Apollo Global Management Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ApolloGlobalManagementInc.Member" xlink:href="cost-20251231.xsd#cost_ApolloGlobalManagementInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ApolloGlobalManagementInc.Member" xlink:to="lab_cost_ApolloGlobalManagementInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AristaNetworksInc.Member_label_en-US" xlink:label="lab_cost_AristaNetworksInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Arista Networks Inc. [Member]</link:label>
    <link:label id="lab_cost_AristaNetworksInc.Member_documentation_en-US" xlink:label="lab_cost_AristaNetworksInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Arista Networks Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AristaNetworksInc.Member" xlink:href="cost-20251231.xsd#cost_AristaNetworksInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AristaNetworksInc.Member" xlink:to="lab_cost_AristaNetworksInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AtmosEnergyCorp.Member_label_en-US" xlink:label="lab_cost_AtmosEnergyCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Atmos Energy Corp. [Member]</link:label>
    <link:label id="lab_cost_AtmosEnergyCorp.Member_documentation_en-US" xlink:label="lab_cost_AtmosEnergyCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Atmos Energy Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AtmosEnergyCorp.Member" xlink:href="cost-20251231.xsd#cost_AtmosEnergyCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AtmosEnergyCorp.Member" xlink:to="lab_cost_AtmosEnergyCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AutozoneInc.Member_label_en-US" xlink:label="lab_cost_AutozoneInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Autozone Inc. [Member]</link:label>
    <link:label id="lab_cost_AutozoneInc.Member_documentation_en-US" xlink:label="lab_cost_AutozoneInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Autozone Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AutozoneInc.Member" xlink:href="cost-20251231.xsd#cost_AutozoneInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AutozoneInc.Member" xlink:to="lab_cost_AutozoneInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BankOfAmericaCorp.Member_label_en-US" xlink:label="lab_cost_BankOfAmericaCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Bank of America Corp. [Member]</link:label>
    <link:label id="lab_cost_BankOfAmericaCorp.Member_documentation_en-US" xlink:label="lab_cost_BankOfAmericaCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Bank of America Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BankOfAmericaCorp.Member" xlink:href="cost-20251231.xsd#cost_BankOfAmericaCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BankOfAmericaCorp.Member" xlink:to="lab_cost_BankOfAmericaCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BerkshireHathawayInc.ClassBMember_label_en-US" xlink:label="lab_cost_BerkshireHathawayInc.ClassBMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Berkshire Hathaway Inc., Class B [Member]</link:label>
    <link:label id="lab_cost_BerkshireHathawayInc.ClassBMember_documentation_en-US" xlink:label="lab_cost_BerkshireHathawayInc.ClassBMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Berkshire Hathaway Inc., Class B</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BerkshireHathawayInc.ClassBMember" xlink:href="cost-20251231.xsd#cost_BerkshireHathawayInc.ClassBMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BerkshireHathawayInc.ClassBMember" xlink:to="lab_cost_BerkshireHathawayInc.ClassBMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BookingHoldingsInc.Member_label_en-US" xlink:label="lab_cost_BookingHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Booking Holdings Inc. [Member]</link:label>
    <link:label id="lab_cost_BookingHoldingsInc.Member_documentation_en-US" xlink:label="lab_cost_BookingHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Booking Holdings Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BookingHoldingsInc.Member" xlink:href="cost-20251231.xsd#cost_BookingHoldingsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BookingHoldingsInc.Member" xlink:to="lab_cost_BookingHoldingsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CapitalOneFinancialCorporationMember_label_en-US" xlink:label="lab_cost_CapitalOneFinancialCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital One Financial Corporation [Member]</link:label>
    <link:label id="lab_cost_CapitalOneFinancialCorporationMember_documentation_en-US" xlink:label="lab_cost_CapitalOneFinancialCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Capital One Financial Corporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CapitalOneFinancialCorporationMember" xlink:href="cost-20251231.xsd#cost_CapitalOneFinancialCorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CapitalOneFinancialCorporationMember" xlink:to="lab_cost_CapitalOneFinancialCorporationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CaterpillarInc.Member_label_en-US" xlink:label="lab_cost_CaterpillarInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Caterpillar Inc. [Member]</link:label>
    <link:label id="lab_cost_CaterpillarInc.Member_documentation_en-US" xlink:label="lab_cost_CaterpillarInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Caterpillar Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CaterpillarInc.Member" xlink:href="cost-20251231.xsd#cost_CaterpillarInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CaterpillarInc.Member" xlink:to="lab_cost_CaterpillarInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ChevronCorp.Member_label_en-US" xlink:label="lab_cost_ChevronCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Chevron Corp. [Member]</link:label>
    <link:label id="lab_cost_ChevronCorp.Member_documentation_en-US" xlink:label="lab_cost_ChevronCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Chevron Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ChevronCorp.Member" xlink:href="cost-20251231.xsd#cost_ChevronCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ChevronCorp.Member" xlink:to="lab_cost_ChevronCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CignaGroupMember_label_en-US" xlink:label="lab_cost_CignaGroupMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cigna Group [Member]</link:label>
    <link:label id="lab_cost_CignaGroupMember_documentation_en-US" xlink:label="lab_cost_CignaGroupMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cigna Group</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CignaGroupMember" xlink:href="cost-20251231.xsd#cost_CignaGroupMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CignaGroupMember" xlink:to="lab_cost_CignaGroupMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CiscoSystemsInc.Member_label_en-US" xlink:label="lab_cost_CiscoSystemsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cisco Systems Inc. [Member]</link:label>
    <link:label id="lab_cost_CiscoSystemsInc.Member_documentation_en-US" xlink:label="lab_cost_CiscoSystemsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cisco Systems Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CiscoSystemsInc.Member" xlink:href="cost-20251231.xsd#cost_CiscoSystemsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CiscoSystemsInc.Member" xlink:to="lab_cost_CiscoSystemsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CitigroupInc.Member_label_en-US" xlink:label="lab_cost_CitigroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Citigroup Inc. [Member]</link:label>
    <link:label id="lab_cost_CitigroupInc.Member_documentation_en-US" xlink:label="lab_cost_CitigroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Citigroup Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CitigroupInc.Member" xlink:href="cost-20251231.xsd#cost_CitigroupInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CitigroupInc.Member" xlink:to="lab_cost_CitigroupInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CMEGroupInc.Member_label_en-US" xlink:label="lab_cost_CMEGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">CME Group Inc. [Member]</link:label>
    <link:label id="lab_cost_CMEGroupInc.Member_documentation_en-US" xlink:label="lab_cost_CMEGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">CME Group Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CMEGroupInc.Member" xlink:href="cost-20251231.xsd#cost_CMEGroupInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CMEGroupInc.Member" xlink:to="lab_cost_CMEGroupInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ColgatePalmoliveCompanyMember_label_en-US" xlink:label="lab_cost_ColgatePalmoliveCompanyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Colgate-Palmolive Company [Member]</link:label>
    <link:label id="lab_cost_ColgatePalmoliveCompanyMember_documentation_en-US" xlink:label="lab_cost_ColgatePalmoliveCompanyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Colgate-Palmolive Company</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ColgatePalmoliveCompanyMember" xlink:href="cost-20251231.xsd#cost_ColgatePalmoliveCompanyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ColgatePalmoliveCompanyMember" xlink:to="lab_cost_ColgatePalmoliveCompanyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ConocophillipsMember_label_en-US" xlink:label="lab_cost_ConocophillipsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Conocophillips [Member]</link:label>
    <link:label id="lab_cost_ConocophillipsMember_documentation_en-US" xlink:label="lab_cost_ConocophillipsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Conocophillips</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ConocophillipsMember" xlink:href="cost-20251231.xsd#cost_ConocophillipsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ConocophillipsMember" xlink:to="lab_cost_ConocophillipsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CorebridgeFinancialInc.Member_label_en-US" xlink:label="lab_cost_CorebridgeFinancialInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Corebridge Financial Inc. [Member]</link:label>
    <link:label id="lab_cost_CorebridgeFinancialInc.Member_documentation_en-US" xlink:label="lab_cost_CorebridgeFinancialInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Corebridge Financial Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CorebridgeFinancialInc.Member" xlink:href="cost-20251231.xsd#cost_CorebridgeFinancialInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CorebridgeFinancialInc.Member" xlink:to="lab_cost_CorebridgeFinancialInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CSXCorp.Member_label_en-US" xlink:label="lab_cost_CSXCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">CSX Corp. [Member]</link:label>
    <link:label id="lab_cost_CSXCorp.Member_documentation_en-US" xlink:label="lab_cost_CSXCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">CSX Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CSXCorp.Member" xlink:href="cost-20251231.xsd#cost_CSXCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CSXCorp.Member" xlink:to="lab_cost_CSXCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_DanaherCorp.Member_label_en-US" xlink:label="lab_cost_DanaherCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Danaher Corp. [Member]</link:label>
    <link:label id="lab_cost_DanaherCorp.Member_documentation_en-US" xlink:label="lab_cost_DanaherCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Danaher Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_DanaherCorp.Member" xlink:href="cost-20251231.xsd#cost_DanaherCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_DanaherCorp.Member" xlink:to="lab_cost_DanaherCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_DeereCompanyMember_label_en-US" xlink:label="lab_cost_DeereCompanyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deere &amp; Company [Member]</link:label>
    <link:label id="lab_cost_DeereCompanyMember_documentation_en-US" xlink:label="lab_cost_DeereCompanyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Deere &amp; Company</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_DeereCompanyMember" xlink:href="cost-20251231.xsd#cost_DeereCompanyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_DeereCompanyMember" xlink:to="lab_cost_DeereCompanyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ElevanceHealthInc.Member_label_en-US" xlink:label="lab_cost_ElevanceHealthInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Elevance Health Inc. [Member]</link:label>
    <link:label id="lab_cost_ElevanceHealthInc.Member_documentation_en-US" xlink:label="lab_cost_ElevanceHealthInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Elevance Health Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ElevanceHealthInc.Member" xlink:href="cost-20251231.xsd#cost_ElevanceHealthInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ElevanceHealthInc.Member" xlink:to="lab_cost_ElevanceHealthInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EquityLifeStylePropertiesInc.Member_label_en-US" xlink:label="lab_cost_EquityLifeStylePropertiesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity LifeStyle Properties Inc. [Member]</link:label>
    <link:label id="lab_cost_EquityLifeStylePropertiesInc.Member_documentation_en-US" xlink:label="lab_cost_EquityLifeStylePropertiesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Equity LifeStyle Properties Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EquityLifeStylePropertiesInc.Member" xlink:href="cost-20251231.xsd#cost_EquityLifeStylePropertiesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EquityLifeStylePropertiesInc.Member" xlink:to="lab_cost_EquityLifeStylePropertiesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EssexPropertyTrustInc.Member_label_en-US" xlink:label="lab_cost_EssexPropertyTrustInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Essex Property Trust Inc. [Member]</link:label>
    <link:label id="lab_cost_EssexPropertyTrustInc.Member_documentation_en-US" xlink:label="lab_cost_EssexPropertyTrustInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Essex Property Trust Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EssexPropertyTrustInc.Member" xlink:href="cost-20251231.xsd#cost_EssexPropertyTrustInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EssexPropertyTrustInc.Member" xlink:to="lab_cost_EssexPropertyTrustInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ExxonMobilCorp.Member_label_en-US" xlink:label="lab_cost_ExxonMobilCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Exxon Mobil Corp. [Member]</link:label>
    <link:label id="lab_cost_ExxonMobilCorp.Member_documentation_en-US" xlink:label="lab_cost_ExxonMobilCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Exxon Mobil Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ExxonMobilCorp.Member" xlink:href="cost-20251231.xsd#cost_ExxonMobilCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ExxonMobilCorp.Member" xlink:to="lab_cost_ExxonMobilCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_FifthThirdBancorpMember_label_en-US" xlink:label="lab_cost_FifthThirdBancorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fifth Third Bancorp [Member]</link:label>
    <link:label id="lab_cost_FifthThirdBancorpMember_documentation_en-US" xlink:label="lab_cost_FifthThirdBancorpMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Fifth Third Bancorp</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_FifthThirdBancorpMember" xlink:href="cost-20251231.xsd#cost_FifthThirdBancorpMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_FifthThirdBancorpMember" xlink:to="lab_cost_FifthThirdBancorpMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_GeneralElectricCompanyMember_label_en-US" xlink:label="lab_cost_GeneralElectricCompanyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">General Electric Company [Member]</link:label>
    <link:label id="lab_cost_GeneralElectricCompanyMember_documentation_en-US" xlink:label="lab_cost_GeneralElectricCompanyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">General Electric Company</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_GeneralElectricCompanyMember" xlink:href="cost-20251231.xsd#cost_GeneralElectricCompanyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_GeneralElectricCompanyMember" xlink:to="lab_cost_GeneralElectricCompanyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_GileadSciencesInc.Member_label_en-US" xlink:label="lab_cost_GileadSciencesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gilead Sciences Inc. [Member]</link:label>
    <link:label id="lab_cost_GileadSciencesInc.Member_documentation_en-US" xlink:label="lab_cost_GileadSciencesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Gilead Sciences Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_GileadSciencesInc.Member" xlink:href="cost-20251231.xsd#cost_GileadSciencesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_GileadSciencesInc.Member" xlink:to="lab_cost_GileadSciencesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_HomeDepotInc.Member_label_en-US" xlink:label="lab_cost_HomeDepotInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Home Depot Inc. [Member]</link:label>
    <link:label id="lab_cost_HomeDepotInc.Member_documentation_en-US" xlink:label="lab_cost_HomeDepotInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Home Depot Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_HomeDepotInc.Member" xlink:href="cost-20251231.xsd#cost_HomeDepotInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_HomeDepotInc.Member" xlink:to="lab_cost_HomeDepotInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_IntelCorporationMember_label_en-US" xlink:label="lab_cost_IntelCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Intel Corporation [Member]</link:label>
    <link:label id="lab_cost_IntelCorporationMember_documentation_en-US" xlink:label="lab_cost_IntelCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Intel Corporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_IntelCorporationMember" xlink:href="cost-20251231.xsd#cost_IntelCorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_IntelCorporationMember" xlink:to="lab_cost_IntelCorporationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_IntercontinentalExchangeInc.Member_label_en-US" xlink:label="lab_cost_IntercontinentalExchangeInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Intercontinental Exchange Inc. [Member]</link:label>
    <link:label id="lab_cost_IntercontinentalExchangeInc.Member_documentation_en-US" xlink:label="lab_cost_IntercontinentalExchangeInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Intercontinental Exchange Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_IntercontinentalExchangeInc.Member" xlink:href="cost-20251231.xsd#cost_IntercontinentalExchangeInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_IntercontinentalExchangeInc.Member" xlink:to="lab_cost_IntercontinentalExchangeInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_InterDigitalInc.Member_label_en-US" xlink:label="lab_cost_InterDigitalInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">InterDigital Inc. [Member]</link:label>
    <link:label id="lab_cost_InterDigitalInc.Member_documentation_en-US" xlink:label="lab_cost_InterDigitalInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">InterDigital Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_InterDigitalInc.Member" xlink:href="cost-20251231.xsd#cost_InterDigitalInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_InterDigitalInc.Member" xlink:to="lab_cost_InterDigitalInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_InternationalBusinessMachinesCorporationMember_label_en-US" xlink:label="lab_cost_InternationalBusinessMachinesCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">International Business Machines Corporation [Member]</link:label>
    <link:label id="lab_cost_InternationalBusinessMachinesCorporationMember_documentation_en-US" xlink:label="lab_cost_InternationalBusinessMachinesCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">International Business Machines Corporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_InternationalBusinessMachinesCorporationMember" xlink:href="cost-20251231.xsd#cost_InternationalBusinessMachinesCorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_InternationalBusinessMachinesCorporationMember" xlink:to="lab_cost_InternationalBusinessMachinesCorporationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_InternationalPaperCompanyMember_label_en-US" xlink:label="lab_cost_InternationalPaperCompanyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">International Paper Company [Member]</link:label>
    <link:label id="lab_cost_InternationalPaperCompanyMember_documentation_en-US" xlink:label="lab_cost_InternationalPaperCompanyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">International Paper Company</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_InternationalPaperCompanyMember" xlink:href="cost-20251231.xsd#cost_InternationalPaperCompanyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_InternationalPaperCompanyMember" xlink:to="lab_cost_InternationalPaperCompanyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_JohnsonJohnsonMember_label_en-US" xlink:label="lab_cost_JohnsonJohnsonMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Johnson &amp; Johnson [Member]</link:label>
    <link:label id="lab_cost_JohnsonJohnsonMember_documentation_en-US" xlink:label="lab_cost_JohnsonJohnsonMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Johnson &amp; Johnson</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_JohnsonJohnsonMember" xlink:href="cost-20251231.xsd#cost_JohnsonJohnsonMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_JohnsonJohnsonMember" xlink:to="lab_cost_JohnsonJohnsonMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_JPMorganChaseCo.Member_label_en-US" xlink:label="lab_cost_JPMorganChaseCo.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">JPMorgan Chase &amp; Co. [Member]</link:label>
    <link:label id="lab_cost_JPMorganChaseCo.Member_documentation_en-US" xlink:label="lab_cost_JPMorganChaseCo.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">JPMorgan Chase &amp; Co.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_JPMorganChaseCo.Member" xlink:href="cost-20251231.xsd#cost_JPMorganChaseCo.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_JPMorganChaseCo.Member" xlink:to="lab_cost_JPMorganChaseCo.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_KeyCorpMember_label_en-US" xlink:label="lab_cost_KeyCorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">KeyCorp [Member]</link:label>
    <link:label id="lab_cost_KeyCorpMember_documentation_en-US" xlink:label="lab_cost_KeyCorpMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">KeyCorp</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_KeyCorpMember" xlink:href="cost-20251231.xsd#cost_KeyCorpMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_KeyCorpMember" xlink:to="lab_cost_KeyCorpMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_KLACorp.Member_label_en-US" xlink:label="lab_cost_KLACorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">KLA Corp. [Member]</link:label>
    <link:label id="lab_cost_KLACorp.Member_documentation_en-US" xlink:label="lab_cost_KLACorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">KLA Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_KLACorp.Member" xlink:href="cost-20251231.xsd#cost_KLACorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_KLACorp.Member" xlink:to="lab_cost_KLACorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_LamResearchCorporationMember_label_en-US" xlink:label="lab_cost_LamResearchCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lam Research Corporation [Member]</link:label>
    <link:label id="lab_cost_LamResearchCorporationMember_documentation_en-US" xlink:label="lab_cost_LamResearchCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Lam Research Corporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_LamResearchCorporationMember" xlink:href="cost-20251231.xsd#cost_LamResearchCorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_LamResearchCorporationMember" xlink:to="lab_cost_LamResearchCorporationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_LowesCompaniesInc.Member_label_en-US" xlink:label="lab_cost_LowesCompaniesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lowe's Companies Inc. [Member]</link:label>
    <link:label id="lab_cost_LowesCompaniesInc.Member_documentation_en-US" xlink:label="lab_cost_LowesCompaniesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Lowe's Companies Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_LowesCompaniesInc.Member" xlink:href="cost-20251231.xsd#cost_LowesCompaniesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_LowesCompaniesInc.Member" xlink:to="lab_cost_LowesCompaniesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_McDonaldsCorp.Member_label_en-US" xlink:label="lab_cost_McDonaldsCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">McDonald's Corp. [Member]</link:label>
    <link:label id="lab_cost_McDonaldsCorp.Member_documentation_en-US" xlink:label="lab_cost_McDonaldsCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">McDonald's Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_McDonaldsCorp.Member" xlink:href="cost-20251231.xsd#cost_McDonaldsCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_McDonaldsCorp.Member" xlink:to="lab_cost_McDonaldsCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MerckCo.Inc.Member_label_en-US" xlink:label="lab_cost_MerckCo.Inc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Merck &amp; Co. Inc. [Member]</link:label>
    <link:label id="lab_cost_MerckCo.Inc.Member_documentation_en-US" xlink:label="lab_cost_MerckCo.Inc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Merck &amp; Co. Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MerckCo.Inc.Member" xlink:href="cost-20251231.xsd#cost_MerckCo.Inc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MerckCo.Inc.Member" xlink:to="lab_cost_MerckCo.Inc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MetaPlatformsInc.Member_label_en-US" xlink:label="lab_cost_MetaPlatformsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Meta Platforms Inc. [Member]</link:label>
    <link:label id="lab_cost_MetaPlatformsInc.Member_documentation_en-US" xlink:label="lab_cost_MetaPlatformsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Meta Platforms Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MetaPlatformsInc.Member" xlink:href="cost-20251231.xsd#cost_MetaPlatformsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MetaPlatformsInc.Member" xlink:to="lab_cost_MetaPlatformsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MetlifeInc.Member_label_en-US" xlink:label="lab_cost_MetlifeInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Metlife Inc. [Member]</link:label>
    <link:label id="lab_cost_MetlifeInc.Member_documentation_en-US" xlink:label="lab_cost_MetlifeInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Metlife Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MetlifeInc.Member" xlink:href="cost-20251231.xsd#cost_MetlifeInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MetlifeInc.Member" xlink:to="lab_cost_MetlifeInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MicrosoftCorporationMember_label_en-US" xlink:label="lab_cost_MicrosoftCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Microsoft Corporation [Member]</link:label>
    <link:label id="lab_cost_MicrosoftCorporationMember_documentation_en-US" xlink:label="lab_cost_MicrosoftCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Microsoft Corporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MicrosoftCorporationMember" xlink:href="cost-20251231.xsd#cost_MicrosoftCorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MicrosoftCorporationMember" xlink:to="lab_cost_MicrosoftCorporationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MondelezInternationalInc.Member_label_en-US" xlink:label="lab_cost_MondelezInternationalInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Mondelez International Inc. [Member]</link:label>
    <link:label id="lab_cost_MondelezInternationalInc.Member_documentation_en-US" xlink:label="lab_cost_MondelezInternationalInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Mondelez International Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MondelezInternationalInc.Member" xlink:href="cost-20251231.xsd#cost_MondelezInternationalInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MondelezInternationalInc.Member" xlink:to="lab_cost_MondelezInternationalInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MorganStanleyMember_label_en-US" xlink:label="lab_cost_MorganStanleyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Morgan Stanley [Member]</link:label>
    <link:label id="lab_cost_MorganStanleyMember_documentation_en-US" xlink:label="lab_cost_MorganStanleyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Morgan Stanley</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MorganStanleyMember" xlink:href="cost-20251231.xsd#cost_MorganStanleyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MorganStanleyMember" xlink:to="lab_cost_MorganStanleyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_NorfolkSouthernCorp.Member_label_en-US" xlink:label="lab_cost_NorfolkSouthernCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Norfolk Southern Corp. [Member]</link:label>
    <link:label id="lab_cost_NorfolkSouthernCorp.Member_documentation_en-US" xlink:label="lab_cost_NorfolkSouthernCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Norfolk Southern Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_NorfolkSouthernCorp.Member" xlink:href="cost-20251231.xsd#cost_NorfolkSouthernCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_NorfolkSouthernCorp.Member" xlink:to="lab_cost_NorfolkSouthernCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_NorthropGrummanCorp.Member_label_en-US" xlink:label="lab_cost_NorthropGrummanCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Northrop Grumman Corp. [Member]</link:label>
    <link:label id="lab_cost_NorthropGrummanCorp.Member_documentation_en-US" xlink:label="lab_cost_NorthropGrummanCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Northrop Grumman Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_NorthropGrummanCorp.Member" xlink:href="cost-20251231.xsd#cost_NorthropGrummanCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_NorthropGrummanCorp.Member" xlink:to="lab_cost_NorthropGrummanCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_OwensCorningMember_label_en-US" xlink:label="lab_cost_OwensCorningMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Owens Corning [Member]</link:label>
    <link:label id="lab_cost_OwensCorningMember_documentation_en-US" xlink:label="lab_cost_OwensCorningMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Owens Corning</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_OwensCorningMember" xlink:href="cost-20251231.xsd#cost_OwensCorningMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_OwensCorningMember" xlink:to="lab_cost_OwensCorningMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_PACCARInc.Member_label_en-US" xlink:label="lab_cost_PACCARInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PACCAR Inc. [Member]</link:label>
    <link:label id="lab_cost_PACCARInc.Member_documentation_en-US" xlink:label="lab_cost_PACCARInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">PACCAR Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_PACCARInc.Member" xlink:href="cost-20251231.xsd#cost_PACCARInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_PACCARInc.Member" xlink:to="lab_cost_PACCARInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ParkerHannifinCorp.Member_label_en-US" xlink:label="lab_cost_ParkerHannifinCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Parker-Hannifin Corp. [Member]</link:label>
    <link:label id="lab_cost_ParkerHannifinCorp.Member_documentation_en-US" xlink:label="lab_cost_ParkerHannifinCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Parker-Hannifin Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ParkerHannifinCorp.Member" xlink:href="cost-20251231.xsd#cost_ParkerHannifinCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ParkerHannifinCorp.Member" xlink:to="lab_cost_ParkerHannifinCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_PinterestInc.ClassAMember_label_en-US" xlink:label="lab_cost_PinterestInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pinterest Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_PinterestInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_PinterestInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Pinterest Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_PinterestInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_PinterestInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_PinterestInc.ClassAMember" xlink:to="lab_cost_PinterestInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_PPGIndustriesInc.Member_label_en-US" xlink:label="lab_cost_PPGIndustriesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PPG Industries Inc. [Member]</link:label>
    <link:label id="lab_cost_PPGIndustriesInc.Member_documentation_en-US" xlink:label="lab_cost_PPGIndustriesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">PPG Industries Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_PPGIndustriesInc.Member" xlink:href="cost-20251231.xsd#cost_PPGIndustriesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_PPGIndustriesInc.Member" xlink:to="lab_cost_PPGIndustriesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ProctorGambleCoTheMember_label_en-US" xlink:label="lab_cost_ProctorGambleCoTheMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proctor &amp; Gamble Co/The [Member]</link:label>
    <link:label id="lab_cost_ProctorGambleCoTheMember_documentation_en-US" xlink:label="lab_cost_ProctorGambleCoTheMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Proctor &amp; Gamble Co/The</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ProctorGambleCoTheMember" xlink:href="cost-20251231.xsd#cost_ProctorGambleCoTheMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ProctorGambleCoTheMember" xlink:to="lab_cost_ProctorGambleCoTheMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ProgressiveCorp.Member_label_en-US" xlink:label="lab_cost_ProgressiveCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Progressive Corp. [Member]</link:label>
    <link:label id="lab_cost_ProgressiveCorp.Member_documentation_en-US" xlink:label="lab_cost_ProgressiveCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Progressive Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ProgressiveCorp.Member" xlink:href="cost-20251231.xsd#cost_ProgressiveCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ProgressiveCorp.Member" xlink:to="lab_cost_ProgressiveCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_PublicStorageMember_label_en-US" xlink:label="lab_cost_PublicStorageMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Public Storage [Member]</link:label>
    <link:label id="lab_cost_PublicStorageMember_documentation_en-US" xlink:label="lab_cost_PublicStorageMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Public Storage</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_PublicStorageMember" xlink:href="cost-20251231.xsd#cost_PublicStorageMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_PublicStorageMember" xlink:to="lab_cost_PublicStorageMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_QuestDiagnosticsIncorporatedMember_label_en-US" xlink:label="lab_cost_QuestDiagnosticsIncorporatedMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Quest Diagnostics Incorporated [Member]</link:label>
    <link:label id="lab_cost_QuestDiagnosticsIncorporatedMember_documentation_en-US" xlink:label="lab_cost_QuestDiagnosticsIncorporatedMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Quest Diagnostics Incorporated</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_QuestDiagnosticsIncorporatedMember" xlink:href="cost-20251231.xsd#cost_QuestDiagnosticsIncorporatedMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_QuestDiagnosticsIncorporatedMember" xlink:to="lab_cost_QuestDiagnosticsIncorporatedMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_RangeResourcesCorp.Member_label_en-US" xlink:label="lab_cost_RangeResourcesCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Range Resources Corp. [Member]</link:label>
    <link:label id="lab_cost_RangeResourcesCorp.Member_documentation_en-US" xlink:label="lab_cost_RangeResourcesCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Range Resources Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_RangeResourcesCorp.Member" xlink:href="cost-20251231.xsd#cost_RangeResourcesCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_RangeResourcesCorp.Member" xlink:to="lab_cost_RangeResourcesCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_RepublicServicesInc.Member_label_en-US" xlink:label="lab_cost_RepublicServicesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Republic Services Inc. [Member]</link:label>
    <link:label id="lab_cost_RepublicServicesInc.Member_documentation_en-US" xlink:label="lab_cost_RepublicServicesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Republic Services Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_RepublicServicesInc.Member" xlink:href="cost-20251231.xsd#cost_RepublicServicesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_RepublicServicesInc.Member" xlink:to="lab_cost_RepublicServicesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_RevvityInc.Member_label_en-US" xlink:label="lab_cost_RevvityInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revvity Inc. [Member]</link:label>
    <link:label id="lab_cost_RevvityInc.Member_documentation_en-US" xlink:label="lab_cost_RevvityInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Revvity Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_RevvityInc.Member" xlink:href="cost-20251231.xsd#cost_RevvityInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_RevvityInc.Member" xlink:to="lab_cost_RevvityInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_SalesforceInc.Member_label_en-US" xlink:label="lab_cost_SalesforceInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Salesforce Inc. [Member]</link:label>
    <link:label id="lab_cost_SalesforceInc.Member_documentation_en-US" xlink:label="lab_cost_SalesforceInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Salesforce Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_SalesforceInc.Member" xlink:href="cost-20251231.xsd#cost_SalesforceInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_SalesforceInc.Member" xlink:to="lab_cost_SalesforceInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TenetHealthcareCorp.Member_label_en-US" xlink:label="lab_cost_TenetHealthcareCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Tenet Healthcare Corp. [Member]</link:label>
    <link:label id="lab_cost_TenetHealthcareCorp.Member_documentation_en-US" xlink:label="lab_cost_TenetHealthcareCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tenet Healthcare Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TenetHealthcareCorp.Member" xlink:href="cost-20251231.xsd#cost_TenetHealthcareCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TenetHealthcareCorp.Member" xlink:to="lab_cost_TenetHealthcareCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TexasInstrumentsCorp.Member_label_en-US" xlink:label="lab_cost_TexasInstrumentsCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Texas Instruments Corp. [Member]</link:label>
    <link:label id="lab_cost_TexasInstrumentsCorp.Member_documentation_en-US" xlink:label="lab_cost_TexasInstrumentsCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Texas Instruments Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TexasInstrumentsCorp.Member" xlink:href="cost-20251231.xsd#cost_TexasInstrumentsCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TexasInstrumentsCorp.Member" xlink:to="lab_cost_TexasInstrumentsCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TheCharlesSchwabCorp.Member_label_en-US" xlink:label="lab_cost_TheCharlesSchwabCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">The Charles Schwab Corp. [Member]</link:label>
    <link:label id="lab_cost_TheCharlesSchwabCorp.Member_documentation_en-US" xlink:label="lab_cost_TheCharlesSchwabCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The Charles Schwab Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TheCharlesSchwabCorp.Member" xlink:href="cost-20251231.xsd#cost_TheCharlesSchwabCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TheCharlesSchwabCorp.Member" xlink:to="lab_cost_TheCharlesSchwabCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_GoldmanSachsGroupInc.Member_label_en-US" xlink:label="lab_cost_GoldmanSachsGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goldman Sachs Group Inc. [Member]</link:label>
    <link:label id="lab_cost_GoldmanSachsGroupInc.Member_documentation_en-US" xlink:label="lab_cost_GoldmanSachsGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Goldman Sachs Group Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_GoldmanSachsGroupInc.Member" xlink:href="cost-20251231.xsd#cost_GoldmanSachsGroupInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_GoldmanSachsGroupInc.Member" xlink:to="lab_cost_GoldmanSachsGroupInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TheSouthernCompanyMember_label_en-US" xlink:label="lab_cost_TheSouthernCompanyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">The Southern Company [Member]</link:label>
    <link:label id="lab_cost_TheSouthernCompanyMember_documentation_en-US" xlink:label="lab_cost_TheSouthernCompanyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The Southern Company</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TheSouthernCompanyMember" xlink:href="cost-20251231.xsd#cost_TheSouthernCompanyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TheSouthernCompanyMember" xlink:to="lab_cost_TheSouthernCompanyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TheTravelersCompaniesInc.Member_label_en-US" xlink:label="lab_cost_TheTravelersCompaniesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">The Travelers Companies Inc. [Member]</link:label>
    <link:label id="lab_cost_TheTravelersCompaniesInc.Member_documentation_en-US" xlink:label="lab_cost_TheTravelersCompaniesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The Travelers Companies Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TheTravelersCompaniesInc.Member" xlink:href="cost-20251231.xsd#cost_TheTravelersCompaniesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TheTravelersCompaniesInc.Member" xlink:to="lab_cost_TheTravelersCompaniesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TheWaltDisneyCompanyMember_label_en-US" xlink:label="lab_cost_TheWaltDisneyCompanyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">The Walt Disney Company [Member]</link:label>
    <link:label id="lab_cost_TheWaltDisneyCompanyMember_documentation_en-US" xlink:label="lab_cost_TheWaltDisneyCompanyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The Walt Disney Company</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TheWaltDisneyCompanyMember" xlink:href="cost-20251231.xsd#cost_TheWaltDisneyCompanyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TheWaltDisneyCompanyMember" xlink:to="lab_cost_TheWaltDisneyCompanyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TMobileUSInc.Member_label_en-US" xlink:label="lab_cost_TMobileUSInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">T-Mobile US Inc. [Member]</link:label>
    <link:label id="lab_cost_TMobileUSInc.Member_documentation_en-US" xlink:label="lab_cost_TMobileUSInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">T-Mobile US Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TMobileUSInc.Member" xlink:href="cost-20251231.xsd#cost_TMobileUSInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TMobileUSInc.Member" xlink:to="lab_cost_TMobileUSInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TollBrothersInc.Member_label_en-US" xlink:label="lab_cost_TollBrothersInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Toll Brothers Inc. [Member]</link:label>
    <link:label id="lab_cost_TollBrothersInc.Member_documentation_en-US" xlink:label="lab_cost_TollBrothersInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Toll Brothers Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TollBrothersInc.Member" xlink:href="cost-20251231.xsd#cost_TollBrothersInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TollBrothersInc.Member" xlink:to="lab_cost_TollBrothersInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TractorSupplyCo.Member_label_en-US" xlink:label="lab_cost_TractorSupplyCo.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Tractor Supply Co. [Member]</link:label>
    <link:label id="lab_cost_TractorSupplyCo.Member_documentation_en-US" xlink:label="lab_cost_TractorSupplyCo.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tractor Supply Co.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TractorSupplyCo.Member" xlink:href="cost-20251231.xsd#cost_TractorSupplyCo.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TractorSupplyCo.Member" xlink:to="lab_cost_TractorSupplyCo.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_UnitedHealthGroupInc.Member_label_en-US" xlink:label="lab_cost_UnitedHealthGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">UnitedHealth Group Inc. [Member]</link:label>
    <link:label id="lab_cost_UnitedHealthGroupInc.Member_documentation_en-US" xlink:label="lab_cost_UnitedHealthGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">UnitedHealth Group Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_UnitedHealthGroupInc.Member" xlink:href="cost-20251231.xsd#cost_UnitedHealthGroupInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_UnitedHealthGroupInc.Member" xlink:to="lab_cost_UnitedHealthGroupInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ValeroEnergyCorporationMember_label_en-US" xlink:label="lab_cost_ValeroEnergyCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Valero Energy Corporation [Member]</link:label>
    <link:label id="lab_cost_ValeroEnergyCorporationMember_documentation_en-US" xlink:label="lab_cost_ValeroEnergyCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Valero Energy Corporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ValeroEnergyCorporationMember" xlink:href="cost-20251231.xsd#cost_ValeroEnergyCorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ValeroEnergyCorporationMember" xlink:to="lab_cost_ValeroEnergyCorporationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_VICIPropertiesInc.Member_label_en-US" xlink:label="lab_cost_VICIPropertiesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">VICI Properties Inc. [Member]</link:label>
    <link:label id="lab_cost_VICIPropertiesInc.Member_documentation_en-US" xlink:label="lab_cost_VICIPropertiesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">VICI Properties Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_VICIPropertiesInc.Member" xlink:href="cost-20251231.xsd#cost_VICIPropertiesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_VICIPropertiesInc.Member" xlink:to="lab_cost_VICIPropertiesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_VisaInc.ClassAMember_label_en-US" xlink:label="lab_cost_VisaInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Visa Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_VisaInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_VisaInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Visa Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_VisaInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_VisaInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_VisaInc.ClassAMember" xlink:to="lab_cost_VisaInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_W.W.GraingerInc.Member_label_en-US" xlink:label="lab_cost_W.W.GraingerInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">W. W. Grainger Inc. [Member]</link:label>
    <link:label id="lab_cost_W.W.GraingerInc.Member_documentation_en-US" xlink:label="lab_cost_W.W.GraingerInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">W. W. Grainger Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_W.W.GraingerInc.Member" xlink:href="cost-20251231.xsd#cost_W.W.GraingerInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_W.W.GraingerInc.Member" xlink:to="lab_cost_W.W.GraingerInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_WabtecCorp.Member_label_en-US" xlink:label="lab_cost_WabtecCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Wabtec Corp. [Member]</link:label>
    <link:label id="lab_cost_WabtecCorp.Member_documentation_en-US" xlink:label="lab_cost_WabtecCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Wabtec Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_WabtecCorp.Member" xlink:href="cost-20251231.xsd#cost_WabtecCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_WabtecCorp.Member" xlink:to="lab_cost_WabtecCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_WalmartInc.Member_label_en-US" xlink:label="lab_cost_WalmartInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Walmart Inc. [Member]</link:label>
    <link:label id="lab_cost_WalmartInc.Member_documentation_en-US" xlink:label="lab_cost_WalmartInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Walmart Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_WalmartInc.Member" xlink:href="cost-20251231.xsd#cost_WalmartInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_WalmartInc.Member" xlink:to="lab_cost_WalmartInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_WelltowerInc.Member_label_en-US" xlink:label="lab_cost_WelltowerInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Welltower, Inc. [Member]</link:label>
    <link:label id="lab_cost_WelltowerInc.Member_documentation_en-US" xlink:label="lab_cost_WelltowerInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Welltower, Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_WelltowerInc.Member" xlink:href="cost-20251231.xsd#cost_WelltowerInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_WelltowerInc.Member" xlink:to="lab_cost_WelltowerInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_XcelEnergyMember_label_en-US" xlink:label="lab_cost_XcelEnergyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Xcel Energy [Member]</link:label>
    <link:label id="lab_cost_XcelEnergyMember_documentation_en-US" xlink:label="lab_cost_XcelEnergyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Xcel Energy</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_XcelEnergyMember" xlink:href="cost-20251231.xsd#cost_XcelEnergyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_XcelEnergyMember" xlink:to="lab_cost_XcelEnergyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AstraZenecaPLCMember_label_en-US" xlink:label="lab_cost_AstraZenecaPLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">AstraZeneca PLC [Member]</link:label>
    <link:label id="lab_cost_AstraZenecaPLCMember_documentation_en-US" xlink:label="lab_cost_AstraZenecaPLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">AstraZeneca PLC</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AstraZenecaPLCMember" xlink:href="cost-20251231.xsd#cost_AstraZenecaPLCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AstraZenecaPLCMember" xlink:to="lab_cost_AstraZenecaPLCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ChubbLtd.Member_label_en-US" xlink:label="lab_cost_ChubbLtd.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Chubb Ltd. [Member]</link:label>
    <link:label id="lab_cost_ChubbLtd.Member_documentation_en-US" xlink:label="lab_cost_ChubbLtd.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Chubb Ltd.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ChubbLtd.Member" xlink:href="cost-20251231.xsd#cost_ChubbLtd.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ChubbLtd.Member" xlink:to="lab_cost_ChubbLtd.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_FrancoNevadaCorp.Member_label_en-US" xlink:label="lab_cost_FrancoNevadaCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Franco-Nevada Corp. [Member]</link:label>
    <link:label id="lab_cost_FrancoNevadaCorp.Member_documentation_en-US" xlink:label="lab_cost_FrancoNevadaCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Franco-Nevada Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_FrancoNevadaCorp.Member" xlink:href="cost-20251231.xsd#cost_FrancoNevadaCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_FrancoNevadaCorp.Member" xlink:to="lab_cost_FrancoNevadaCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_LindePLCMember_label_en-US" xlink:label="lab_cost_LindePLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Linde PLC [Member]</link:label>
    <link:label id="lab_cost_LindePLCMember_documentation_en-US" xlink:label="lab_cost_LindePLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Linde PLC</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_LindePLCMember" xlink:href="cost-20251231.xsd#cost_LindePLCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_LindePLCMember" xlink:to="lab_cost_LindePLCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_PentairPLCMember_label_en-US" xlink:label="lab_cost_PentairPLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pentair PLC [Member]</link:label>
    <link:label id="lab_cost_PentairPLCMember_documentation_en-US" xlink:label="lab_cost_PentairPLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Pentair PLC</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_PentairPLCMember" xlink:href="cost-20251231.xsd#cost_PentairPLCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_PentairPLCMember" xlink:to="lab_cost_PentairPLCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_SLBN.V.Member_label_en-US" xlink:label="lab_cost_SLBN.V.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SLB N.V. [Member]</link:label>
    <link:label id="lab_cost_SLBN.V.Member_documentation_en-US" xlink:label="lab_cost_SLBN.V.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">SLB N.V.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_SLBN.V.Member" xlink:href="cost-20251231.xsd#cost_SLBN.V.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_SLBN.V.Member" xlink:to="lab_cost_SLBN.V.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TEConnectivityLtd.Member_label_en-US" xlink:label="lab_cost_TEConnectivityLtd.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">TE Connectivity Ltd. [Member]</link:label>
    <link:label id="lab_cost_TEConnectivityLtd.Member_documentation_en-US" xlink:label="lab_cost_TEConnectivityLtd.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">TE Connectivity Ltd.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TEConnectivityLtd.Member" xlink:href="cost-20251231.xsd#cost_TEConnectivityLtd.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TEConnectivityLtd.Member" xlink:to="lab_cost_TEConnectivityLtd.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_T.RowePriceGovernmentMoneyFundMember_label_en-US" xlink:label="lab_cost_T.RowePriceGovernmentMoneyFundMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">T. Rowe Price Government Money Fund [Member]</link:label>
    <link:label id="lab_cost_T.RowePriceGovernmentMoneyFundMember_documentation_en-US" xlink:label="lab_cost_T.RowePriceGovernmentMoneyFundMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">T. Rowe Price Government Money Fund</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_T.RowePriceGovernmentMoneyFundMember" xlink:href="cost-20251231.xsd#cost_T.RowePriceGovernmentMoneyFundMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_T.RowePriceGovernmentMoneyFundMember" xlink:to="lab_cost_T.RowePriceGovernmentMoneyFundMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AdvancedDrainageSystemsInc.Member_label_en-US" xlink:label="lab_cost_AdvancedDrainageSystemsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Advanced Drainage Systems Inc. [Member]</link:label>
    <link:label id="lab_cost_AdvancedDrainageSystemsInc.Member_documentation_en-US" xlink:label="lab_cost_AdvancedDrainageSystemsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Advanced Drainage Systems Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AdvancedDrainageSystemsInc.Member" xlink:href="cost-20251231.xsd#cost_AdvancedDrainageSystemsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AdvancedDrainageSystemsInc.Member" xlink:to="lab_cost_AdvancedDrainageSystemsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AdvancedEnergyIndustriesInc.Member_label_en-US" xlink:label="lab_cost_AdvancedEnergyIndustriesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Advanced Energy Industries Inc. [Member]</link:label>
    <link:label id="lab_cost_AdvancedEnergyIndustriesInc.Member_documentation_en-US" xlink:label="lab_cost_AdvancedEnergyIndustriesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Advanced Energy Industries Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AdvancedEnergyIndustriesInc.Member" xlink:href="cost-20251231.xsd#cost_AdvancedEnergyIndustriesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AdvancedEnergyIndustriesInc.Member" xlink:to="lab_cost_AdvancedEnergyIndustriesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AlbanyInternationalCorp.ClassAMember_label_en-US" xlink:label="lab_cost_AlbanyInternationalCorp.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Albany International Corp., Class A [Member]</link:label>
    <link:label id="lab_cost_AlbanyInternationalCorp.ClassAMember_documentation_en-US" xlink:label="lab_cost_AlbanyInternationalCorp.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Albany International Corp., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AlbanyInternationalCorp.ClassAMember" xlink:href="cost-20251231.xsd#cost_AlbanyInternationalCorp.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AlbanyInternationalCorp.ClassAMember" xlink:to="lab_cost_AlbanyInternationalCorp.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AlignmentHealthcareInc.Member_label_en-US" xlink:label="lab_cost_AlignmentHealthcareInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Alignment Healthcare Inc. [Member]</link:label>
    <link:label id="lab_cost_AlignmentHealthcareInc.Member_documentation_en-US" xlink:label="lab_cost_AlignmentHealthcareInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Alignment Healthcare Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AlignmentHealthcareInc.Member" xlink:href="cost-20251231.xsd#cost_AlignmentHealthcareInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AlignmentHealthcareInc.Member" xlink:to="lab_cost_AlignmentHealthcareInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AllianceLaundryHoldingsInc.Member_label_en-US" xlink:label="lab_cost_AllianceLaundryHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Alliance Laundry Holdings Inc. [Member]</link:label>
    <link:label id="lab_cost_AllianceLaundryHoldingsInc.Member_documentation_en-US" xlink:label="lab_cost_AllianceLaundryHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Alliance Laundry Holdings Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AllianceLaundryHoldingsInc.Member" xlink:href="cost-20251231.xsd#cost_AllianceLaundryHoldingsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AllianceLaundryHoldingsInc.Member" xlink:to="lab_cost_AllianceLaundryHoldingsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_APIGroupCorp.Member_label_en-US" xlink:label="lab_cost_APIGroupCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">API Group Corp. [Member]</link:label>
    <link:label id="lab_cost_APIGroupCorp.Member_documentation_en-US" xlink:label="lab_cost_APIGroupCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">API Group Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_APIGroupCorp.Member" xlink:href="cost-20251231.xsd#cost_APIGroupCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_APIGroupCorp.Member" xlink:to="lab_cost_APIGroupCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ApogeeTherapeuticsInc.Member_label_en-US" xlink:label="lab_cost_ApogeeTherapeuticsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Apogee Therapeutics Inc. [Member]</link:label>
    <link:label id="lab_cost_ApogeeTherapeuticsInc.Member_documentation_en-US" xlink:label="lab_cost_ApogeeTherapeuticsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Apogee Therapeutics Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ApogeeTherapeuticsInc.Member" xlink:href="cost-20251231.xsd#cost_ApogeeTherapeuticsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ApogeeTherapeuticsInc.Member" xlink:to="lab_cost_ApogeeTherapeuticsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AppliedDigitalCorporationMember_label_en-US" xlink:label="lab_cost_AppliedDigitalCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Applied Digital Corporation [Member]</link:label>
    <link:label id="lab_cost_AppliedDigitalCorporationMember_documentation_en-US" xlink:label="lab_cost_AppliedDigitalCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Applied Digital Corporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AppliedDigitalCorporationMember" xlink:href="cost-20251231.xsd#cost_AppliedDigitalCorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AppliedDigitalCorporationMember" xlink:to="lab_cost_AppliedDigitalCorporationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AptarGroupInc.Member_label_en-US" xlink:label="lab_cost_AptarGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">AptarGroup Inc. [Member]</link:label>
    <link:label id="lab_cost_AptarGroupInc.Member_documentation_en-US" xlink:label="lab_cost_AptarGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">AptarGroup Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AptarGroupInc.Member" xlink:href="cost-20251231.xsd#cost_AptarGroupInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AptarGroupInc.Member" xlink:to="lab_cost_AptarGroupInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ArcosaInc.Member_label_en-US" xlink:label="lab_cost_ArcosaInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Arcosa Inc. [Member]</link:label>
    <link:label id="lab_cost_ArcosaInc.Member_documentation_en-US" xlink:label="lab_cost_ArcosaInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Arcosa Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ArcosaInc.Member" xlink:href="cost-20251231.xsd#cost_ArcosaInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ArcosaInc.Member" xlink:to="lab_cost_ArcosaInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AtlantaBravesHoldingsInc.SeriesCMember_label_en-US" xlink:label="lab_cost_AtlantaBravesHoldingsInc.SeriesCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Atlanta Braves Holdings Inc., Series C [Member]</link:label>
    <link:label id="lab_cost_AtlantaBravesHoldingsInc.SeriesCMember_documentation_en-US" xlink:label="lab_cost_AtlantaBravesHoldingsInc.SeriesCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Atlanta Braves Holdings Inc., Series C</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AtlantaBravesHoldingsInc.SeriesCMember" xlink:href="cost-20251231.xsd#cost_AtlantaBravesHoldingsInc.SeriesCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AtlantaBravesHoldingsInc.SeriesCMember" xlink:to="lab_cost_AtlantaBravesHoldingsInc.SeriesCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AtlanticUnionBanksharesCorporationMember_label_en-US" xlink:label="lab_cost_AtlanticUnionBanksharesCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Atlantic Union Bankshares Corporation [Member]</link:label>
    <link:label id="lab_cost_AtlanticUnionBanksharesCorporationMember_documentation_en-US" xlink:label="lab_cost_AtlanticUnionBanksharesCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Atlantic Union Bankshares Corporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AtlanticUnionBanksharesCorporationMember" xlink:href="cost-20251231.xsd#cost_AtlanticUnionBanksharesCorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AtlanticUnionBanksharesCorporationMember" xlink:to="lab_cost_AtlanticUnionBanksharesCorporationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AtmusFiltrationTechnologiesInc.Member_label_en-US" xlink:label="lab_cost_AtmusFiltrationTechnologiesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Atmus Filtration Technologies Inc. [Member]</link:label>
    <link:label id="lab_cost_AtmusFiltrationTechnologiesInc.Member_documentation_en-US" xlink:label="lab_cost_AtmusFiltrationTechnologiesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Atmus Filtration Technologies Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AtmusFiltrationTechnologiesInc.Member" xlink:href="cost-20251231.xsd#cost_AtmusFiltrationTechnologiesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AtmusFiltrationTechnologiesInc.Member" xlink:to="lab_cost_AtmusFiltrationTechnologiesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AxsomeTherapeuticsInc.Member_label_en-US" xlink:label="lab_cost_AxsomeTherapeuticsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Axsome Therapeutics Inc. [Member]</link:label>
    <link:label id="lab_cost_AxsomeTherapeuticsInc.Member_documentation_en-US" xlink:label="lab_cost_AxsomeTherapeuticsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Axsome Therapeutics Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AxsomeTherapeuticsInc.Member" xlink:href="cost-20251231.xsd#cost_AxsomeTherapeuticsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AxsomeTherapeuticsInc.Member" xlink:to="lab_cost_AxsomeTherapeuticsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_AZZInc.Member_label_en-US" xlink:label="lab_cost_AZZInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">AZZ Inc. [Member]</link:label>
    <link:label id="lab_cost_AZZInc.Member_documentation_en-US" xlink:label="lab_cost_AZZInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">AZZ Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_AZZInc.Member" xlink:href="cost-20251231.xsd#cost_AZZInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_AZZInc.Member" xlink:to="lab_cost_AZZInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BancOfCaliforniaInc.Member_label_en-US" xlink:label="lab_cost_BancOfCaliforniaInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Banc of California Inc. [Member]</link:label>
    <link:label id="lab_cost_BancOfCaliforniaInc.Member_documentation_en-US" xlink:label="lab_cost_BancOfCaliforniaInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Banc of California Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BancOfCaliforniaInc.Member" xlink:href="cost-20251231.xsd#cost_BancOfCaliforniaInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BancOfCaliforniaInc.Member" xlink:to="lab_cost_BancOfCaliforniaInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BelFuseInc.ClassBMember_label_en-US" xlink:label="lab_cost_BelFuseInc.ClassBMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Bel Fuse Inc., Class B [Member]</link:label>
    <link:label id="lab_cost_BelFuseInc.ClassBMember_documentation_en-US" xlink:label="lab_cost_BelFuseInc.ClassBMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Bel Fuse Inc., Class B</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BelFuseInc.ClassBMember" xlink:href="cost-20251231.xsd#cost_BelFuseInc.ClassBMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BelFuseInc.ClassBMember" xlink:to="lab_cost_BelFuseInc.ClassBMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BETATechnologiesInc.ClassAMember_label_en-US" xlink:label="lab_cost_BETATechnologiesInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">BETA Technologies Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_BETATechnologiesInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_BETATechnologiesInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">BETA Technologies Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BETATechnologiesInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_BETATechnologiesInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BETATechnologiesInc.ClassAMember" xlink:to="lab_cost_BETATechnologiesInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BicaraTherapeuticsInc.Member_label_en-US" xlink:label="lab_cost_BicaraTherapeuticsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Bicara Therapeutics Inc. [Member]</link:label>
    <link:label id="lab_cost_BicaraTherapeuticsInc.Member_documentation_en-US" xlink:label="lab_cost_BicaraTherapeuticsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Bicara Therapeutics Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BicaraTherapeuticsInc.Member" xlink:href="cost-20251231.xsd#cost_BicaraTherapeuticsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BicaraTherapeuticsInc.Member" xlink:to="lab_cost_BicaraTherapeuticsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BillionToOneInc.ClassAMember_label_en-US" xlink:label="lab_cost_BillionToOneInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">BillionToOne Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_BillionToOneInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_BillionToOneInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">BillionToOne Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BillionToOneInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_BillionToOneInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BillionToOneInc.ClassAMember" xlink:to="lab_cost_BillionToOneInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BioLifeSolutionsInc.Member_label_en-US" xlink:label="lab_cost_BioLifeSolutionsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">BioLife Solutions Inc. [Member]</link:label>
    <link:label id="lab_cost_BioLifeSolutionsInc.Member_documentation_en-US" xlink:label="lab_cost_BioLifeSolutionsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">BioLife Solutions Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BioLifeSolutionsInc.Member" xlink:href="cost-20251231.xsd#cost_BioLifeSolutionsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BioLifeSolutionsInc.Member" xlink:to="lab_cost_BioLifeSolutionsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BioRadLaboratoriesInc.ClassAMember_label_en-US" xlink:label="lab_cost_BioRadLaboratoriesInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Bio-Rad Laboratories Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_BioRadLaboratoriesInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_BioRadLaboratoriesInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Bio-Rad Laboratories Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BioRadLaboratoriesInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_BioRadLaboratoriesInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BioRadLaboratoriesInc.ClassAMember" xlink:to="lab_cost_BioRadLaboratoriesInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BioTechneCorporationMember_label_en-US" xlink:label="lab_cost_BioTechneCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Bio-Techne Corporation [Member]</link:label>
    <link:label id="lab_cost_BioTechneCorporationMember_documentation_en-US" xlink:label="lab_cost_BioTechneCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Bio-Techne Corporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BioTechneCorporationMember" xlink:href="cost-20251231.xsd#cost_BioTechneCorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BioTechneCorporationMember" xlink:to="lab_cost_BioTechneCorporationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BJsWholesaleClubHoldingsInc.Member_label_en-US" xlink:label="lab_cost_BJsWholesaleClubHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">BJ's Wholesale Club Holdings Inc. [Member]</link:label>
    <link:label id="lab_cost_BJsWholesaleClubHoldingsInc.Member_documentation_en-US" xlink:label="lab_cost_BJsWholesaleClubHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">BJ's Wholesale Club Holdings Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BJsWholesaleClubHoldingsInc.Member" xlink:href="cost-20251231.xsd#cost_BJsWholesaleClubHoldingsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BJsWholesaleClubHoldingsInc.Member" xlink:to="lab_cost_BJsWholesaleClubHoldingsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BlackDiamondTherapeuticsInc.Member_label_en-US" xlink:label="lab_cost_BlackDiamondTherapeuticsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Black Diamond Therapeutics Inc. [Member]</link:label>
    <link:label id="lab_cost_BlackDiamondTherapeuticsInc.Member_documentation_en-US" xlink:label="lab_cost_BlackDiamondTherapeuticsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Black Diamond Therapeutics Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BlackDiamondTherapeuticsInc.Member" xlink:href="cost-20251231.xsd#cost_BlackDiamondTherapeuticsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BlackDiamondTherapeuticsInc.Member" xlink:to="lab_cost_BlackDiamondTherapeuticsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BlackRockCoffeeBarInc.ClassAMember_label_en-US" xlink:label="lab_cost_BlackRockCoffeeBarInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Black Rock Coffee Bar Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_BlackRockCoffeeBarInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_BlackRockCoffeeBarInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Black Rock Coffee Bar Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BlackRockCoffeeBarInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_BlackRockCoffeeBarInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BlackRockCoffeeBarInc.ClassAMember" xlink:to="lab_cost_BlackRockCoffeeBarInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BlueFoundryBancorp.Member_label_en-US" xlink:label="lab_cost_BlueFoundryBancorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Blue Foundry Bancorp. [Member]</link:label>
    <link:label id="lab_cost_BlueFoundryBancorp.Member_documentation_en-US" xlink:label="lab_cost_BlueFoundryBancorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Blue Foundry Bancorp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BlueFoundryBancorp.Member" xlink:href="cost-20251231.xsd#cost_BlueFoundryBancorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BlueFoundryBancorp.Member" xlink:to="lab_cost_BlueFoundryBancorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BootBarnHoldingsInc.Member_label_en-US" xlink:label="lab_cost_BootBarnHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Boot Barn Holdings Inc. [Member]</link:label>
    <link:label id="lab_cost_BootBarnHoldingsInc.Member_documentation_en-US" xlink:label="lab_cost_BootBarnHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Boot Barn Holdings Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BootBarnHoldingsInc.Member" xlink:href="cost-20251231.xsd#cost_BootBarnHoldingsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BootBarnHoldingsInc.Member" xlink:to="lab_cost_BootBarnHoldingsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BRCInc.ClassAMember_label_en-US" xlink:label="lab_cost_BRCInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">BRC Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_BRCInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_BRCInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">BRC Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BRCInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_BRCInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BRCInc.ClassAMember" xlink:to="lab_cost_BRCInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BrightSpringHealthServicesInc.Member_label_en-US" xlink:label="lab_cost_BrightSpringHealthServicesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">BrightSpring Health Services Inc. [Member]</link:label>
    <link:label id="lab_cost_BrightSpringHealthServicesInc.Member_documentation_en-US" xlink:label="lab_cost_BrightSpringHealthServicesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">BrightSpring Health Services Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BrightSpringHealthServicesInc.Member" xlink:href="cost-20251231.xsd#cost_BrightSpringHealthServicesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BrightSpringHealthServicesInc.Member" xlink:to="lab_cost_BrightSpringHealthServicesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CactusInc.ClassAMember_label_en-US" xlink:label="lab_cost_CactusInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cactus Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_CactusInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_CactusInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cactus Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CactusInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_CactusInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CactusInc.ClassAMember" xlink:to="lab_cost_CactusInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CaliforniaWaterServicesGroupMember_label_en-US" xlink:label="lab_cost_CaliforniaWaterServicesGroupMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">California Water Services Group [Member]</link:label>
    <link:label id="lab_cost_CaliforniaWaterServicesGroupMember_documentation_en-US" xlink:label="lab_cost_CaliforniaWaterServicesGroupMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">California Water Services Group</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CaliforniaWaterServicesGroupMember" xlink:href="cost-20251231.xsd#cost_CaliforniaWaterServicesGroupMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CaliforniaWaterServicesGroupMember" xlink:to="lab_cost_CaliforniaWaterServicesGroupMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CareTrustREITInc.Member_label_en-US" xlink:label="lab_cost_CareTrustREITInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">CareTrust REIT Inc. [Member]</link:label>
    <link:label id="lab_cost_CareTrustREITInc.Member_documentation_en-US" xlink:label="lab_cost_CareTrustREITInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">CareTrust REIT Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CareTrustREITInc.Member" xlink:href="cost-20251231.xsd#cost_CareTrustREITInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CareTrustREITInc.Member" xlink:to="lab_cost_CareTrustREITInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CasellaWasterSystemsInc.ClassAMember_label_en-US" xlink:label="lab_cost_CasellaWasterSystemsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Casella Waster Systems Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_CasellaWasterSystemsInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_CasellaWasterSystemsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Casella Waster Systems Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CasellaWasterSystemsInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_CasellaWasterSystemsInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CasellaWasterSystemsInc.ClassAMember" xlink:to="lab_cost_CasellaWasterSystemsInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CavaGroupInc.Member_label_en-US" xlink:label="lab_cost_CavaGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cava Group Inc. [Member]</link:label>
    <link:label id="lab_cost_CavaGroupInc.Member_documentation_en-US" xlink:label="lab_cost_CavaGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cava Group Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CavaGroupInc.Member" xlink:href="cost-20251231.xsd#cost_CavaGroupInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CavaGroupInc.Member" xlink:to="lab_cost_CavaGroupInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CECOEnvironmentalCorp.Member_label_en-US" xlink:label="lab_cost_CECOEnvironmentalCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">CECO Environmental Corp. [Member]</link:label>
    <link:label id="lab_cost_CECOEnvironmentalCorp.Member_documentation_en-US" xlink:label="lab_cost_CECOEnvironmentalCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">CECO Environmental Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CECOEnvironmentalCorp.Member" xlink:href="cost-20251231.xsd#cost_CECOEnvironmentalCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CECOEnvironmentalCorp.Member" xlink:to="lab_cost_CECOEnvironmentalCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CGOncologyInc.Member_label_en-US" xlink:label="lab_cost_CGOncologyInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">CG Oncology Inc. [Member]</link:label>
    <link:label id="lab_cost_CGOncologyInc.Member_documentation_en-US" xlink:label="lab_cost_CGOncologyInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">CG Oncology Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CGOncologyInc.Member" xlink:href="cost-20251231.xsd#cost_CGOncologyInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CGOncologyInc.Member" xlink:to="lab_cost_CGOncologyInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CheckrInc.Member_label_en-US" xlink:label="lab_cost_CheckrInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Checkr Inc. [Member]</link:label>
    <link:label id="lab_cost_CheckrInc.Member_documentation_en-US" xlink:label="lab_cost_CheckrInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Checkr Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CheckrInc.Member" xlink:href="cost-20251231.xsd#cost_CheckrInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CheckrInc.Member" xlink:to="lab_cost_CheckrInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ChesapeakeUtilitiesCorp.Member_label_en-US" xlink:label="lab_cost_ChesapeakeUtilitiesCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Chesapeake Utilities Corp. [Member]</link:label>
    <link:label id="lab_cost_ChesapeakeUtilitiesCorp.Member_documentation_en-US" xlink:label="lab_cost_ChesapeakeUtilitiesCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Chesapeake Utilities Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ChesapeakeUtilitiesCorp.Member" xlink:href="cost-20251231.xsd#cost_ChesapeakeUtilitiesCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ChesapeakeUtilitiesCorp.Member" xlink:to="lab_cost_ChesapeakeUtilitiesCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CipherDigitalInc.Member_label_en-US" xlink:label="lab_cost_CipherDigitalInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cipher Digital Inc. [Member]</link:label>
    <link:label id="lab_cost_CipherDigitalInc.Member_documentation_en-US" xlink:label="lab_cost_CipherDigitalInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cipher Digital Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CipherDigitalInc.Member" xlink:href="cost-20251231.xsd#cost_CipherDigitalInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CipherDigitalInc.Member" xlink:to="lab_cost_CipherDigitalInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ColumbiaBankingSystemsInc.Member_label_en-US" xlink:label="lab_cost_ColumbiaBankingSystemsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Columbia Banking Systems Inc. [Member]</link:label>
    <link:label id="lab_cost_ColumbiaBankingSystemsInc.Member_documentation_en-US" xlink:label="lab_cost_ColumbiaBankingSystemsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Columbia Banking Systems Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ColumbiaBankingSystemsInc.Member" xlink:href="cost-20251231.xsd#cost_ColumbiaBankingSystemsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ColumbiaBankingSystemsInc.Member" xlink:to="lab_cost_ColumbiaBankingSystemsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CraneCo.Member_label_en-US" xlink:label="lab_cost_CraneCo.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Crane Co. [Member]</link:label>
    <link:label id="lab_cost_CraneCo.Member_documentation_en-US" xlink:label="lab_cost_CraneCo.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Crane Co.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CraneCo.Member" xlink:href="cost-20251231.xsd#cost_CraneCo.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CraneCo.Member" xlink:to="lab_cost_CraneCo.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CRBGroupInc.Member_label_en-US" xlink:label="lab_cost_CRBGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">CRB Group Inc. [Member]</link:label>
    <link:label id="lab_cost_CRBGroupInc.Member_documentation_en-US" xlink:label="lab_cost_CRBGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">CRB Group Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CRBGroupInc.Member" xlink:href="cost-20251231.xsd#cost_CRBGroupInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CRBGroupInc.Member" xlink:to="lab_cost_CRBGroupInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CSWIndustrialsInc.Member_label_en-US" xlink:label="lab_cost_CSWIndustrialsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">CSW Industrials Inc. [Member]</link:label>
    <link:label id="lab_cost_CSWIndustrialsInc.Member_documentation_en-US" xlink:label="lab_cost_CSWIndustrialsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">CSW Industrials Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CSWIndustrialsInc.Member" xlink:href="cost-20251231.xsd#cost_CSWIndustrialsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CSWIndustrialsInc.Member" xlink:to="lab_cost_CSWIndustrialsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CubesmartMember_label_en-US" xlink:label="lab_cost_CubesmartMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cubesmart [Member]</link:label>
    <link:label id="lab_cost_CubesmartMember_documentation_en-US" xlink:label="lab_cost_CubesmartMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cubesmart</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CubesmartMember" xlink:href="cost-20251231.xsd#cost_CubesmartMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CubesmartMember" xlink:to="lab_cost_CubesmartMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CurblinePropertiesCorp.Member_label_en-US" xlink:label="lab_cost_CurblinePropertiesCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Curbline Properties Corp. [Member]</link:label>
    <link:label id="lab_cost_CurblinePropertiesCorp.Member_documentation_en-US" xlink:label="lab_cost_CurblinePropertiesCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Curbline Properties Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CurblinePropertiesCorp.Member" xlink:href="cost-20251231.xsd#cost_CurblinePropertiesCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CurblinePropertiesCorp.Member" xlink:to="lab_cost_CurblinePropertiesCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_DenaliTherapeuticsInc.Member_label_en-US" xlink:label="lab_cost_DenaliTherapeuticsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Denali Therapeutics Inc. [Member]</link:label>
    <link:label id="lab_cost_DenaliTherapeuticsInc.Member_documentation_en-US" xlink:label="lab_cost_DenaliTherapeuticsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Denali Therapeutics Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_DenaliTherapeuticsInc.Member" xlink:href="cost-20251231.xsd#cost_DenaliTherapeuticsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_DenaliTherapeuticsInc.Member" xlink:to="lab_cost_DenaliTherapeuticsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_DimeCommunityBancsharesInc.Member_label_en-US" xlink:label="lab_cost_DimeCommunityBancsharesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Dime Community Bancshares Inc. [Member]</link:label>
    <link:label id="lab_cost_DimeCommunityBancsharesInc.Member_documentation_en-US" xlink:label="lab_cost_DimeCommunityBancsharesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Dime Community Bancshares Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_DimeCommunityBancsharesInc.Member" xlink:href="cost-20251231.xsd#cost_DimeCommunityBancsharesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_DimeCommunityBancsharesInc.Member" xlink:to="lab_cost_DimeCommunityBancsharesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_DutchBrosInc.ClassAMember_label_en-US" xlink:label="lab_cost_DutchBrosInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Dutch Bros Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_DutchBrosInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_DutchBrosInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Dutch Bros Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_DutchBrosInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_DutchBrosInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_DutchBrosInc.ClassAMember" xlink:to="lab_cost_DutchBrosInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_DyneTherapeuticsInc.Member_label_en-US" xlink:label="lab_cost_DyneTherapeuticsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Dyne Therapeutics Inc. [Member]</link:label>
    <link:label id="lab_cost_DyneTherapeuticsInc.Member_documentation_en-US" xlink:label="lab_cost_DyneTherapeuticsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Dyne Therapeutics Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_DyneTherapeuticsInc.Member" xlink:href="cost-20251231.xsd#cost_DyneTherapeuticsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_DyneTherapeuticsInc.Member" xlink:to="lab_cost_DyneTherapeuticsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EastWestBancorpInc.Member_label_en-US" xlink:label="lab_cost_EastWestBancorpInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">East West Bancorp Inc. [Member]</link:label>
    <link:label id="lab_cost_EastWestBancorpInc.Member_documentation_en-US" xlink:label="lab_cost_EastWestBancorpInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">East West Bancorp Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EastWestBancorpInc.Member" xlink:href="cost-20251231.xsd#cost_EastWestBancorpInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EastWestBancorpInc.Member" xlink:to="lab_cost_EastWestBancorpInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EasternBanksharesInc.Member_label_en-US" xlink:label="lab_cost_EasternBanksharesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eastern Bankshares Inc. [Member]</link:label>
    <link:label id="lab_cost_EasternBanksharesInc.Member_documentation_en-US" xlink:label="lab_cost_EasternBanksharesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eastern Bankshares Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EasternBanksharesInc.Member" xlink:href="cost-20251231.xsd#cost_EasternBanksharesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EasternBanksharesInc.Member" xlink:to="lab_cost_EasternBanksharesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EastgroupPropertiesInc.Member_label_en-US" xlink:label="lab_cost_EastgroupPropertiesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Eastgroup Properties Inc. [Member]</link:label>
    <link:label id="lab_cost_EastgroupPropertiesInc.Member_documentation_en-US" xlink:label="lab_cost_EastgroupPropertiesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Eastgroup Properties Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EastgroupPropertiesInc.Member" xlink:href="cost-20251231.xsd#cost_EastgroupPropertiesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EastgroupPropertiesInc.Member" xlink:to="lab_cost_EastgroupPropertiesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ElementSolutionsInc.Member_label_en-US" xlink:label="lab_cost_ElementSolutionsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Element Solutions Inc. [Member]</link:label>
    <link:label id="lab_cost_ElementSolutionsInc.Member_documentation_en-US" xlink:label="lab_cost_ElementSolutionsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Element Solutions Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ElementSolutionsInc.Member" xlink:href="cost-20251231.xsd#cost_ElementSolutionsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ElementSolutionsInc.Member" xlink:to="lab_cost_ElementSolutionsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EnproInc.Member_label_en-US" xlink:label="lab_cost_EnproInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Enpro Inc. [Member]</link:label>
    <link:label id="lab_cost_EnproInc.Member_documentation_en-US" xlink:label="lab_cost_EnproInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Enpro Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EnproInc.Member" xlink:href="cost-20251231.xsd#cost_EnproInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EnproInc.Member" xlink:to="lab_cost_EnproInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EntegrisInc.Member_label_en-US" xlink:label="lab_cost_EntegrisInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entegris Inc. [Member]</link:label>
    <link:label id="lab_cost_EntegrisInc.Member_documentation_en-US" xlink:label="lab_cost_EntegrisInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Entegris Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EntegrisInc.Member" xlink:href="cost-20251231.xsd#cost_EntegrisInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EntegrisInc.Member" xlink:to="lab_cost_EntegrisInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EquityBancsharesInc.ClassAMember_label_en-US" xlink:label="lab_cost_EquityBancsharesInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Bancshares Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_EquityBancsharesInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_EquityBancsharesInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Equity Bancshares Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EquityBancsharesInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_EquityBancsharesInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EquityBancsharesInc.ClassAMember" xlink:to="lab_cost_EquityBancsharesInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ErascaInc.Member_label_en-US" xlink:label="lab_cost_ErascaInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Erasca Inc. [Member]</link:label>
    <link:label id="lab_cost_ErascaInc.Member_documentation_en-US" xlink:label="lab_cost_ErascaInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Erasca Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ErascaInc.Member" xlink:href="cost-20251231.xsd#cost_ErascaInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ErascaInc.Member" xlink:to="lab_cost_ErascaInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EscoTechnologiesInc.Member_label_en-US" xlink:label="lab_cost_EscoTechnologiesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Esco Technologies Inc. [Member]</link:label>
    <link:label id="lab_cost_EscoTechnologiesInc.Member_documentation_en-US" xlink:label="lab_cost_EscoTechnologiesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Esco Technologies Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EscoTechnologiesInc.Member" xlink:href="cost-20251231.xsd#cost_EscoTechnologiesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EscoTechnologiesInc.Member" xlink:to="lab_cost_EscoTechnologiesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_FBFinancialCorp.Member_label_en-US" xlink:label="lab_cost_FBFinancialCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">FB Financial Corp. [Member]</link:label>
    <link:label id="lab_cost_FBFinancialCorp.Member_documentation_en-US" xlink:label="lab_cost_FBFinancialCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">FB Financial Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_FBFinancialCorp.Member" xlink:href="cost-20251231.xsd#cost_FBFinancialCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_FBFinancialCorp.Member" xlink:to="lab_cost_FBFinancialCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_FederalSignalCorp.Member_label_en-US" xlink:label="lab_cost_FederalSignalCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Federal Signal Corp. [Member]</link:label>
    <link:label id="lab_cost_FederalSignalCorp.Member_documentation_en-US" xlink:label="lab_cost_FederalSignalCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Federal Signal Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_FederalSignalCorp.Member" xlink:href="cost-20251231.xsd#cost_FederalSignalCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_FederalSignalCorp.Member" xlink:to="lab_cost_FederalSignalCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_FiveStarBancorpMember_label_en-US" xlink:label="lab_cost_FiveStarBancorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Star Bancorp [Member]</link:label>
    <link:label id="lab_cost_FiveStarBancorpMember_documentation_en-US" xlink:label="lab_cost_FiveStarBancorpMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five Star Bancorp</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_FiveStarBancorpMember" xlink:href="cost-20251231.xsd#cost_FiveStarBancorpMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_FiveStarBancorpMember" xlink:to="lab_cost_FiveStarBancorpMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_FlagshipCommunitiesREITUTMember_label_en-US" xlink:label="lab_cost_FlagshipCommunitiesREITUTMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Flagship Communities REIT UT [Member]</link:label>
    <link:label id="lab_cost_FlagshipCommunitiesREITUTMember_documentation_en-US" xlink:label="lab_cost_FlagshipCommunitiesREITUTMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Flagship Communities REIT UT</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_FlagshipCommunitiesREITUTMember" xlink:href="cost-20251231.xsd#cost_FlagshipCommunitiesREITUTMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_FlagshipCommunitiesREITUTMember" xlink:to="lab_cost_FlagshipCommunitiesREITUTMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_FlagstarBankNationalAssociationMember_label_en-US" xlink:label="lab_cost_FlagstarBankNationalAssociationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Flagstar Bank, National Association [Member]</link:label>
    <link:label id="lab_cost_FlagstarBankNationalAssociationMember_documentation_en-US" xlink:label="lab_cost_FlagstarBankNationalAssociationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Flagstar Bank, National Association</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_FlagstarBankNationalAssociationMember" xlink:href="cost-20251231.xsd#cost_FlagstarBankNationalAssociationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_FlagstarBankNationalAssociationMember" xlink:to="lab_cost_FlagstarBankNationalAssociationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_FloorDecorHoldingsInc.ClassAMember_label_en-US" xlink:label="lab_cost_FloorDecorHoldingsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Floor &amp; D&#233;cor Holdings Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_FloorDecorHoldingsInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_FloorDecorHoldingsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Floor &amp; D&#233;cor Holdings Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_FloorDecorHoldingsInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_FloorDecorHoldingsInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_FloorDecorHoldingsInc.ClassAMember" xlink:to="lab_cost_FloorDecorHoldingsInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_FlowserveCorporationMember_label_en-US" xlink:label="lab_cost_FlowserveCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Flowserve Corporation [Member]</link:label>
    <link:label id="lab_cost_FlowserveCorporationMember_documentation_en-US" xlink:label="lab_cost_FlowserveCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Flowserve Corporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_FlowserveCorporationMember" xlink:href="cost-20251231.xsd#cost_FlowserveCorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_FlowserveCorporationMember" xlink:to="lab_cost_FlowserveCorporationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_FTAIAviationLtd.Member_label_en-US" xlink:label="lab_cost_FTAIAviationLtd.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">FTAI Aviation Ltd. [Member]</link:label>
    <link:label id="lab_cost_FTAIAviationLtd.Member_documentation_en-US" xlink:label="lab_cost_FTAIAviationLtd.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">FTAI Aviation Ltd.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_FTAIAviationLtd.Member" xlink:href="cost-20251231.xsd#cost_FTAIAviationLtd.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_FTAIAviationLtd.Member" xlink:to="lab_cost_FTAIAviationLtd.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_GCILibertyInc.SeriesCMember_label_en-US" xlink:label="lab_cost_GCILibertyInc.SeriesCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">GCI Liberty Inc., Series C [Member]</link:label>
    <link:label id="lab_cost_GCILibertyInc.SeriesCMember_documentation_en-US" xlink:label="lab_cost_GCILibertyInc.SeriesCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">GCI Liberty Inc., Series C</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_GCILibertyInc.SeriesCMember" xlink:href="cost-20251231.xsd#cost_GCILibertyInc.SeriesCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_GCILibertyInc.SeriesCMember" xlink:to="lab_cost_GCILibertyInc.SeriesCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_GeneDxHoldingsCorp.ClassAMember_label_en-US" xlink:label="lab_cost_GeneDxHoldingsCorp.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">GeneDx Holdings Corp., Class A [Member]</link:label>
    <link:label id="lab_cost_GeneDxHoldingsCorp.ClassAMember_documentation_en-US" xlink:label="lab_cost_GeneDxHoldingsCorp.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">GeneDx Holdings Corp., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_GeneDxHoldingsCorp.ClassAMember" xlink:href="cost-20251231.xsd#cost_GeneDxHoldingsCorp.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_GeneDxHoldingsCorp.ClassAMember" xlink:to="lab_cost_GeneDxHoldingsCorp.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_GooseheadInsuranceInc.ClassAMember_label_en-US" xlink:label="lab_cost_GooseheadInsuranceInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goosehead Insurance Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_GooseheadInsuranceInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_GooseheadInsuranceInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Goosehead Insurance Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_GooseheadInsuranceInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_GooseheadInsuranceInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_GooseheadInsuranceInc.ClassAMember" xlink:to="lab_cost_GooseheadInsuranceInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_GPGIInc.Member_label_en-US" xlink:label="lab_cost_GPGIInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">GPGI Inc. [Member]</link:label>
    <link:label id="lab_cost_GPGIInc.Member_documentation_en-US" xlink:label="lab_cost_GPGIInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">GPGI Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_GPGIInc.Member" xlink:href="cost-20251231.xsd#cost_GPGIInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_GPGIInc.Member" xlink:to="lab_cost_GPGIInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_GracoInc.Member_label_en-US" xlink:label="lab_cost_GracoInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Graco Inc. [Member]</link:label>
    <link:label id="lab_cost_GracoInc.Member_documentation_en-US" xlink:label="lab_cost_GracoInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Graco Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_GracoInc.Member" xlink:href="cost-20251231.xsd#cost_GracoInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_GracoInc.Member" xlink:to="lab_cost_GracoInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_GRAILInc.Member_label_en-US" xlink:label="lab_cost_GRAILInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">GRAIL Inc. [Member]</link:label>
    <link:label id="lab_cost_GRAILInc.Member_documentation_en-US" xlink:label="lab_cost_GRAILInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">GRAIL Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_GRAILInc.Member" xlink:href="cost-20251231.xsd#cost_GRAILInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_GRAILInc.Member" xlink:to="lab_cost_GRAILInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_GroceryOutletHoldingCorp.Member_label_en-US" xlink:label="lab_cost_GroceryOutletHoldingCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Grocery Outlet Holding Corp. [Member]</link:label>
    <link:label id="lab_cost_GroceryOutletHoldingCorp.Member_documentation_en-US" xlink:label="lab_cost_GroceryOutletHoldingCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Grocery Outlet Holding Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_GroceryOutletHoldingCorp.Member" xlink:href="cost-20251231.xsd#cost_GroceryOutletHoldingCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_GroceryOutletHoldingCorp.Member" xlink:to="lab_cost_GroceryOutletHoldingCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_HASustainableInfrastructureCapitalInc.Member_label_en-US" xlink:label="lab_cost_HASustainableInfrastructureCapitalInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">HA Sustainable Infrastructure Capital Inc. [Member]</link:label>
    <link:label id="lab_cost_HASustainableInfrastructureCapitalInc.Member_documentation_en-US" xlink:label="lab_cost_HASustainableInfrastructureCapitalInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">HA Sustainable Infrastructure Capital Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_HASustainableInfrastructureCapitalInc.Member" xlink:href="cost-20251231.xsd#cost_HASustainableInfrastructureCapitalInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_HASustainableInfrastructureCapitalInc.Member" xlink:to="lab_cost_HASustainableInfrastructureCapitalInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_HagertyInc.ClassAMember_label_en-US" xlink:label="lab_cost_HagertyInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Hagerty Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_HagertyInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_HagertyInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Hagerty Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_HagertyInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_HagertyInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_HagertyInc.ClassAMember" xlink:to="lab_cost_HagertyInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_HamiltonLaneInc.ClassAMember_label_en-US" xlink:label="lab_cost_HamiltonLaneInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Hamilton Lane Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_HamiltonLaneInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_HamiltonLaneInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Hamilton Lane Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_HamiltonLaneInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_HamiltonLaneInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_HamiltonLaneInc.ClassAMember" xlink:to="lab_cost_HamiltonLaneInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_HaulHubSeriesCConvertibleMember_label_en-US" xlink:label="lab_cost_HaulHubSeriesCConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Haul Hub, Series C Convertible [Member]</link:label>
    <link:label id="lab_cost_HaulHubSeriesCConvertibleMember_documentation_en-US" xlink:label="lab_cost_HaulHubSeriesCConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Haul Hub, Series C Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_HaulHubSeriesCConvertibleMember" xlink:href="cost-20251231.xsd#cost_HaulHubSeriesCConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_HaulHubSeriesCConvertibleMember" xlink:to="lab_cost_HaulHubSeriesCConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_HealthequityInc.Member_label_en-US" xlink:label="lab_cost_HealthequityInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Healthequity Inc. [Member]</link:label>
    <link:label id="lab_cost_HealthequityInc.Member_documentation_en-US" xlink:label="lab_cost_HealthequityInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Healthequity Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_HealthequityInc.Member" xlink:href="cost-20251231.xsd#cost_HealthequityInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_HealthequityInc.Member" xlink:to="lab_cost_HealthequityInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_HomeBancsharesInc.Member_label_en-US" xlink:label="lab_cost_HomeBancsharesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Home Bancshares Inc. [Member]</link:label>
    <link:label id="lab_cost_HomeBancsharesInc.Member_documentation_en-US" xlink:label="lab_cost_HomeBancsharesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Home Bancshares Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_HomeBancsharesInc.Member" xlink:href="cost-20251231.xsd#cost_HomeBancsharesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_HomeBancsharesInc.Member" xlink:to="lab_cost_HomeBancsharesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_I3VerticalsInc.ClassAMember_label_en-US" xlink:label="lab_cost_I3VerticalsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">i3 Verticals Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_I3VerticalsInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_I3VerticalsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">i3 Verticals Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_I3VerticalsInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_I3VerticalsInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_I3VerticalsInc.ClassAMember" xlink:to="lab_cost_I3VerticalsInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ICapitalInc.Member_label_en-US" xlink:label="lab_cost_ICapitalInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">iCapital Inc. [Member]</link:label>
    <link:label id="lab_cost_ICapitalInc.Member_documentation_en-US" xlink:label="lab_cost_ICapitalInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">iCapital Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ICapitalInc.Member" xlink:href="cost-20251231.xsd#cost_ICapitalInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ICapitalInc.Member" xlink:to="lab_cost_ICapitalInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_IdacorpInc.Member_label_en-US" xlink:label="lab_cost_IdacorpInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Idacorp Inc. [Member]</link:label>
    <link:label id="lab_cost_IdacorpInc.Member_documentation_en-US" xlink:label="lab_cost_IdacorpInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Idacorp Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_IdacorpInc.Member" xlink:href="cost-20251231.xsd#cost_IdacorpInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_IdacorpInc.Member" xlink:to="lab_cost_IdacorpInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ImmunomeInc.Member_label_en-US" xlink:label="lab_cost_ImmunomeInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Immunome Inc. [Member]</link:label>
    <link:label id="lab_cost_ImmunomeInc.Member_documentation_en-US" xlink:label="lab_cost_ImmunomeInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Immunome Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ImmunomeInc.Member" xlink:href="cost-20251231.xsd#cost_ImmunomeInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ImmunomeInc.Member" xlink:to="lab_cost_ImmunomeInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ImmunovantInc.Member_label_en-US" xlink:label="lab_cost_ImmunovantInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Immunovant Inc. [Member]</link:label>
    <link:label id="lab_cost_ImmunovantInc.Member_documentation_en-US" xlink:label="lab_cost_ImmunovantInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Immunovant Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ImmunovantInc.Member" xlink:href="cost-20251231.xsd#cost_ImmunovantInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ImmunovantInc.Member" xlink:to="lab_cost_ImmunovantInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ImpinjInc.Member_label_en-US" xlink:label="lab_cost_ImpinjInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Impinj Inc. [Member]</link:label>
    <link:label id="lab_cost_ImpinjInc.Member_documentation_en-US" xlink:label="lab_cost_ImpinjInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Impinj Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ImpinjInc.Member" xlink:href="cost-20251231.xsd#cost_ImpinjInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ImpinjInc.Member" xlink:to="lab_cost_ImpinjInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_IndependenceRealtyTrustInc.Member_label_en-US" xlink:label="lab_cost_IndependenceRealtyTrustInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Independence Realty Trust Inc. [Member]</link:label>
    <link:label id="lab_cost_IndependenceRealtyTrustInc.Member_documentation_en-US" xlink:label="lab_cost_IndependenceRealtyTrustInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Independence Realty Trust Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_IndependenceRealtyTrustInc.Member" xlink:href="cost-20251231.xsd#cost_IndependenceRealtyTrustInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_IndependenceRealtyTrustInc.Member" xlink:to="lab_cost_IndependenceRealtyTrustInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_InstalledBuildingProductsInc.Member_label_en-US" xlink:label="lab_cost_InstalledBuildingProductsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Installed Building Products Inc. [Member]</link:label>
    <link:label id="lab_cost_InstalledBuildingProductsInc.Member_documentation_en-US" xlink:label="lab_cost_InstalledBuildingProductsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Installed Building Products Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_InstalledBuildingProductsInc.Member" xlink:href="cost-20251231.xsd#cost_InstalledBuildingProductsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_InstalledBuildingProductsInc.Member" xlink:to="lab_cost_InstalledBuildingProductsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_IonQInc.Member_label_en-US" xlink:label="lab_cost_IonQInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">IonQ Inc. [Member]</link:label>
    <link:label id="lab_cost_IonQInc.Member_documentation_en-US" xlink:label="lab_cost_IonQInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">IonQ Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_IonQInc.Member" xlink:href="cost-20251231.xsd#cost_IonQInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_IonQInc.Member" xlink:to="lab_cost_IonQInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_IRadimedCorp.Member_label_en-US" xlink:label="lab_cost_IRadimedCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">IRadimed Corp. [Member]</link:label>
    <link:label id="lab_cost_IRadimedCorp.Member_documentation_en-US" xlink:label="lab_cost_IRadimedCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">IRadimed Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_IRadimedCorp.Member" xlink:href="cost-20251231.xsd#cost_IRadimedCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_IRadimedCorp.Member" xlink:to="lab_cost_IRadimedCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_JBTMarelCorporationMember_label_en-US" xlink:label="lab_cost_JBTMarelCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">JBT Marel Corporation [Member]</link:label>
    <link:label id="lab_cost_JBTMarelCorporationMember_documentation_en-US" xlink:label="lab_cost_JBTMarelCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">JBT Marel Corporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_JBTMarelCorporationMember" xlink:href="cost-20251231.xsd#cost_JBTMarelCorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_JBTMarelCorporationMember" xlink:to="lab_cost_JBTMarelCorporationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_JFrogLtd.Member_label_en-US" xlink:label="lab_cost_JFrogLtd.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">JFrog Ltd. [Member]</link:label>
    <link:label id="lab_cost_JFrogLtd.Member_documentation_en-US" xlink:label="lab_cost_JFrogLtd.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">JFrog Ltd.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_JFrogLtd.Member" xlink:href="cost-20251231.xsd#cost_JFrogLtd.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_JFrogLtd.Member" xlink:to="lab_cost_JFrogLtd.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_KadantInc.Member_label_en-US" xlink:label="lab_cost_KadantInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Kadant Inc. [Member]</link:label>
    <link:label id="lab_cost_KadantInc.Member_documentation_en-US" xlink:label="lab_cost_KadantInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Kadant Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_KadantInc.Member" xlink:href="cost-20251231.xsd#cost_KadantInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_KadantInc.Member" xlink:to="lab_cost_KadantInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_KarmanHoldingsInc.Member_label_en-US" xlink:label="lab_cost_KarmanHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Karman Holdings Inc. [Member]</link:label>
    <link:label id="lab_cost_KarmanHoldingsInc.Member_documentation_en-US" xlink:label="lab_cost_KarmanHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Karman Holdings Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_KarmanHoldingsInc.Member" xlink:href="cost-20251231.xsd#cost_KarmanHoldingsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_KarmanHoldingsInc.Member" xlink:to="lab_cost_KarmanHoldingsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_KearnyFinancialCorpMdMember_label_en-US" xlink:label="lab_cost_KearnyFinancialCorpMdMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Kearny Financial Corp/Md [Member]</link:label>
    <link:label id="lab_cost_KearnyFinancialCorpMdMember_documentation_en-US" xlink:label="lab_cost_KearnyFinancialCorpMdMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Kearny Financial Corp/Md</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_KearnyFinancialCorpMdMember" xlink:href="cost-20251231.xsd#cost_KearnyFinancialCorpMdMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_KearnyFinancialCorpMdMember" xlink:to="lab_cost_KearnyFinancialCorpMdMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_KnifeRiverCorp.Member_label_en-US" xlink:label="lab_cost_KnifeRiverCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Knife River Corp. [Member]</link:label>
    <link:label id="lab_cost_KnifeRiverCorp.Member_documentation_en-US" xlink:label="lab_cost_KnifeRiverCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Knife River Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_KnifeRiverCorp.Member" xlink:href="cost-20251231.xsd#cost_KnifeRiverCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_KnifeRiverCorp.Member" xlink:to="lab_cost_KnifeRiverCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_KodiakSciencesInc.Member_label_en-US" xlink:label="lab_cost_KodiakSciencesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Kodiak Sciences Inc. [Member]</link:label>
    <link:label id="lab_cost_KodiakSciencesInc.Member_documentation_en-US" xlink:label="lab_cost_KodiakSciencesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Kodiak Sciences Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_KodiakSciencesInc.Member" xlink:href="cost-20251231.xsd#cost_KodiakSciencesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_KodiakSciencesInc.Member" xlink:to="lab_cost_KodiakSciencesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_KontoorBrandsInc.Member_label_en-US" xlink:label="lab_cost_KontoorBrandsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Kontoor Brands Inc. [Member]</link:label>
    <link:label id="lab_cost_KontoorBrandsInc.Member_documentation_en-US" xlink:label="lab_cost_KontoorBrandsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Kontoor Brands Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_KontoorBrandsInc.Member" xlink:href="cost-20251231.xsd#cost_KontoorBrandsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_KontoorBrandsInc.Member" xlink:to="lab_cost_KontoorBrandsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_KratosDefenseSecuritySolutionsInc.Member_label_en-US" xlink:label="lab_cost_KratosDefenseSecuritySolutionsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Kratos Defense &amp; Security Solutions Inc. [Member]</link:label>
    <link:label id="lab_cost_KratosDefenseSecuritySolutionsInc.Member_documentation_en-US" xlink:label="lab_cost_KratosDefenseSecuritySolutionsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Kratos Defense &amp; Security Solutions Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_KratosDefenseSecuritySolutionsInc.Member" xlink:href="cost-20251231.xsd#cost_KratosDefenseSecuritySolutionsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_KratosDefenseSecuritySolutionsInc.Member" xlink:to="lab_cost_KratosDefenseSecuritySolutionsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_KymeraTherapeuticsInc.Member_label_en-US" xlink:label="lab_cost_KymeraTherapeuticsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Kymera Therapeutics Inc. [Member]</link:label>
    <link:label id="lab_cost_KymeraTherapeuticsInc.Member_documentation_en-US" xlink:label="lab_cost_KymeraTherapeuticsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Kymera Therapeutics Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_KymeraTherapeuticsInc.Member" xlink:href="cost-20251231.xsd#cost_KymeraTherapeuticsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_KymeraTherapeuticsInc.Member" xlink:to="lab_cost_KymeraTherapeuticsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_LeonardoDRSInc.Member_label_en-US" xlink:label="lab_cost_LeonardoDRSInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Leonardo DRS Inc. [Member]</link:label>
    <link:label id="lab_cost_LeonardoDRSInc.Member_documentation_en-US" xlink:label="lab_cost_LeonardoDRSInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Leonardo DRS Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_LeonardoDRSInc.Member" xlink:href="cost-20251231.xsd#cost_LeonardoDRSInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_LeonardoDRSInc.Member" xlink:to="lab_cost_LeonardoDRSInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_LifeTimeGroupHoldingsInc.Member_label_en-US" xlink:label="lab_cost_LifeTimeGroupHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Life Time Group Holdings Inc. [Member]</link:label>
    <link:label id="lab_cost_LifeTimeGroupHoldingsInc.Member_documentation_en-US" xlink:label="lab_cost_LifeTimeGroupHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Life Time Group Holdings Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_LifeTimeGroupHoldingsInc.Member" xlink:href="cost-20251231.xsd#cost_LifeTimeGroupHoldingsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_LifeTimeGroupHoldingsInc.Member" xlink:to="lab_cost_LifeTimeGroupHoldingsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_LittlefuseInc.Member_label_en-US" xlink:label="lab_cost_LittlefuseInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Littlefuse Inc. [Member]</link:label>
    <link:label id="lab_cost_LittlefuseInc.Member_documentation_en-US" xlink:label="lab_cost_LittlefuseInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Littlefuse Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_LittlefuseInc.Member" xlink:href="cost-20251231.xsd#cost_LittlefuseInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_LittlefuseInc.Member" xlink:to="lab_cost_LittlefuseInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_LiveOakBancsharesInc.Member_label_en-US" xlink:label="lab_cost_LiveOakBancsharesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Live Oak Bancshares Inc. [Member]</link:label>
    <link:label id="lab_cost_LiveOakBancsharesInc.Member_documentation_en-US" xlink:label="lab_cost_LiveOakBancsharesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Live Oak Bancshares Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_LiveOakBancsharesInc.Member" xlink:href="cost-20251231.xsd#cost_LiveOakBancsharesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_LiveOakBancsharesInc.Member" xlink:to="lab_cost_LiveOakBancsharesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_LoarHoldingsInc.Member_label_en-US" xlink:label="lab_cost_LoarHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loar Holdings Inc. [Member]</link:label>
    <link:label id="lab_cost_LoarHoldingsInc.Member_documentation_en-US" xlink:label="lab_cost_LoarHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Loar Holdings Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_LoarHoldingsInc.Member" xlink:href="cost-20251231.xsd#cost_LoarHoldingsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_LoarHoldingsInc.Member" xlink:to="lab_cost_LoarHoldingsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_LouisianaPacificCorp.Member_label_en-US" xlink:label="lab_cost_LouisianaPacificCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Louisiana-Pacific Corp. [Member]</link:label>
    <link:label id="lab_cost_LouisianaPacificCorp.Member_documentation_en-US" xlink:label="lab_cost_LouisianaPacificCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Louisiana-Pacific Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_LouisianaPacificCorp.Member" xlink:href="cost-20251231.xsd#cost_LouisianaPacificCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_LouisianaPacificCorp.Member" xlink:to="lab_cost_LouisianaPacificCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_LumexaImagingHoldingsInc.Member_label_en-US" xlink:label="lab_cost_LumexaImagingHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lumexa Imaging Holdings Inc. [Member]</link:label>
    <link:label id="lab_cost_LumexaImagingHoldingsInc.Member_documentation_en-US" xlink:label="lab_cost_LumexaImagingHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Lumexa Imaging Holdings Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_LumexaImagingHoldingsInc.Member" xlink:href="cost-20251231.xsd#cost_LumexaImagingHoldingsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_LumexaImagingHoldingsInc.Member" xlink:to="lab_cost_LumexaImagingHoldingsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MadisonSquareGardenSportsCorp.Member_label_en-US" xlink:label="lab_cost_MadisonSquareGardenSportsCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Madison Square Garden Sports Corp. [Member]</link:label>
    <link:label id="lab_cost_MadisonSquareGardenSportsCorp.Member_documentation_en-US" xlink:label="lab_cost_MadisonSquareGardenSportsCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Madison Square Garden Sports Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MadisonSquareGardenSportsCorp.Member" xlink:href="cost-20251231.xsd#cost_MadisonSquareGardenSportsCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MadisonSquareGardenSportsCorp.Member" xlink:to="lab_cost_MadisonSquareGardenSportsCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MapLightTherapeuticsInc.Member_label_en-US" xlink:label="lab_cost_MapLightTherapeuticsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">MapLight Therapeutics Inc. [Member]</link:label>
    <link:label id="lab_cost_MapLightTherapeuticsInc.Member_documentation_en-US" xlink:label="lab_cost_MapLightTherapeuticsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">MapLight Therapeutics Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MapLightTherapeuticsInc.Member" xlink:href="cost-20251231.xsd#cost_MapLightTherapeuticsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MapLightTherapeuticsInc.Member" xlink:to="lab_cost_MapLightTherapeuticsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MaravaiLifeSciencesHoldingsInc.ClassAMember_label_en-US" xlink:label="lab_cost_MaravaiLifeSciencesHoldingsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maravai LifeSciences Holdings Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_MaravaiLifeSciencesHoldingsInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_MaravaiLifeSciencesHoldingsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Maravai LifeSciences Holdings Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MaravaiLifeSciencesHoldingsInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_MaravaiLifeSciencesHoldingsInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MaravaiLifeSciencesHoldingsInc.ClassAMember" xlink:to="lab_cost_MaravaiLifeSciencesHoldingsInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MarqetaInc.Member_label_en-US" xlink:label="lab_cost_MarqetaInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Marqeta Inc. [Member]</link:label>
    <link:label id="lab_cost_MarqetaInc.Member_documentation_en-US" xlink:label="lab_cost_MarqetaInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Marqeta Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MarqetaInc.Member" xlink:href="cost-20251231.xsd#cost_MarqetaInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MarqetaInc.Member" xlink:to="lab_cost_MarqetaInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MercurySystemsInc.Member_label_en-US" xlink:label="lab_cost_MercurySystemsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Mercury Systems Inc. [Member]</link:label>
    <link:label id="lab_cost_MercurySystemsInc.Member_documentation_en-US" xlink:label="lab_cost_MercurySystemsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Mercury Systems Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MercurySystemsInc.Member" xlink:href="cost-20251231.xsd#cost_MercurySystemsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MercurySystemsInc.Member" xlink:to="lab_cost_MercurySystemsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MiamiInternationalHoldingsInc.Member_label_en-US" xlink:label="lab_cost_MiamiInternationalHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Miami International Holdings Inc. [Member]</link:label>
    <link:label id="lab_cost_MiamiInternationalHoldingsInc.Member_documentation_en-US" xlink:label="lab_cost_MiamiInternationalHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Miami International Holdings Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MiamiInternationalHoldingsInc.Member" xlink:href="cost-20251231.xsd#cost_MiamiInternationalHoldingsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MiamiInternationalHoldingsInc.Member" xlink:to="lab_cost_MiamiInternationalHoldingsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MiddlesexWaterCo.Member_label_en-US" xlink:label="lab_cost_MiddlesexWaterCo.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Middlesex Water Co. [Member]</link:label>
    <link:label id="lab_cost_MiddlesexWaterCo.Member_documentation_en-US" xlink:label="lab_cost_MiddlesexWaterCo.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Middlesex Water Co.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MiddlesexWaterCo.Member" xlink:href="cost-20251231.xsd#cost_MiddlesexWaterCo.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MiddlesexWaterCo.Member" xlink:to="lab_cost_MiddlesexWaterCo.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MirionTechnologiesInc.ClassAMember_label_en-US" xlink:label="lab_cost_MirionTechnologiesInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Mirion Technologies Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_MirionTechnologiesInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_MirionTechnologiesInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Mirion Technologies Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MirionTechnologiesInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_MirionTechnologiesInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MirionTechnologiesInc.ClassAMember" xlink:to="lab_cost_MirionTechnologiesInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MSASafetyInc.Member_label_en-US" xlink:label="lab_cost_MSASafetyInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">MSA Safety Inc. [Member]</link:label>
    <link:label id="lab_cost_MSASafetyInc.Member_documentation_en-US" xlink:label="lab_cost_MSASafetyInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">MSA Safety Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MSASafetyInc.Member" xlink:href="cost-20251231.xsd#cost_MSASafetyInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MSASafetyInc.Member" xlink:to="lab_cost_MSASafetyInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MYRGroupInc.Member_label_en-US" xlink:label="lab_cost_MYRGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">MYR Group Inc. [Member]</link:label>
    <link:label id="lab_cost_MYRGroupInc.Member_documentation_en-US" xlink:label="lab_cost_MYRGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">MYR Group Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MYRGroupInc.Member" xlink:href="cost-20251231.xsd#cost_MYRGroupInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MYRGroupInc.Member" xlink:to="lab_cost_MYRGroupInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_NationalEnergyServicesReunitedCorp.Member_label_en-US" xlink:label="lab_cost_NationalEnergyServicesReunitedCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">National Energy Services Reunited Corp. [Member]</link:label>
    <link:label id="lab_cost_NationalEnergyServicesReunitedCorp.Member_documentation_en-US" xlink:label="lab_cost_NationalEnergyServicesReunitedCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">National Energy Services Reunited Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_NationalEnergyServicesReunitedCorp.Member" xlink:href="cost-20251231.xsd#cost_NationalEnergyServicesReunitedCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_NationalEnergyServicesReunitedCorp.Member" xlink:to="lab_cost_NationalEnergyServicesReunitedCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_NCinoInc.Member_label_en-US" xlink:label="lab_cost_NCinoInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">nCino Inc. [Member]</link:label>
    <link:label id="lab_cost_NCinoInc.Member_documentation_en-US" xlink:label="lab_cost_NCinoInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">nCino Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_NCinoInc.Member" xlink:href="cost-20251231.xsd#cost_NCinoInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_NCinoInc.Member" xlink:to="lab_cost_NCinoInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_NeogenCorp.Member_label_en-US" xlink:label="lab_cost_NeogenCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Neogen Corp. [Member]</link:label>
    <link:label id="lab_cost_NeogenCorp.Member_documentation_en-US" xlink:label="lab_cost_NeogenCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Neogen Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_NeogenCorp.Member" xlink:href="cost-20251231.xsd#cost_NeogenCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_NeogenCorp.Member" xlink:to="lab_cost_NeogenCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_NeptuneInsuranceHoldingsInc.ClassAMember_label_en-US" xlink:label="lab_cost_NeptuneInsuranceHoldingsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Neptune Insurance Holdings Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_NeptuneInsuranceHoldingsInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_NeptuneInsuranceHoldingsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Neptune Insurance Holdings Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_NeptuneInsuranceHoldingsInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_NeptuneInsuranceHoldingsInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_NeptuneInsuranceHoldingsInc.ClassAMember" xlink:to="lab_cost_NeptuneInsuranceHoldingsInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_OceanFirstFinancialCorp.Member_label_en-US" xlink:label="lab_cost_OceanFirstFinancialCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">OceanFirst Financial Corp. [Member]</link:label>
    <link:label id="lab_cost_OceanFirstFinancialCorp.Member_documentation_en-US" xlink:label="lab_cost_OceanFirstFinancialCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">OceanFirst Financial Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_OceanFirstFinancialCorp.Member" xlink:href="cost-20251231.xsd#cost_OceanFirstFinancialCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_OceanFirstFinancialCorp.Member" xlink:to="lab_cost_OceanFirstFinancialCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_OGEEnergyCorp.Member_label_en-US" xlink:label="lab_cost_OGEEnergyCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">OGE Energy Corp. [Member]</link:label>
    <link:label id="lab_cost_OGEEnergyCorp.Member_documentation_en-US" xlink:label="lab_cost_OGEEnergyCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">OGE Energy Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_OGEEnergyCorp.Member" xlink:href="cost-20251231.xsd#cost_OGEEnergyCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_OGEEnergyCorp.Member" xlink:to="lab_cost_OGEEnergyCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_OlaplexHoldingsInc.Member_label_en-US" xlink:label="lab_cost_OlaplexHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Olaplex Holdings Inc. [Member]</link:label>
    <link:label id="lab_cost_OlaplexHoldingsInc.Member_documentation_en-US" xlink:label="lab_cost_OlaplexHoldingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Olaplex Holdings Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_OlaplexHoldingsInc.Member" xlink:href="cost-20251231.xsd#cost_OlaplexHoldingsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_OlaplexHoldingsInc.Member" xlink:to="lab_cost_OlaplexHoldingsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_OntoInnovationInc.Member_label_en-US" xlink:label="lab_cost_OntoInnovationInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Onto Innovation Inc. [Member]</link:label>
    <link:label id="lab_cost_OntoInnovationInc.Member_documentation_en-US" xlink:label="lab_cost_OntoInnovationInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Onto Innovation Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_OntoInnovationInc.Member" xlink:href="cost-20251231.xsd#cost_OntoInnovationInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_OntoInnovationInc.Member" xlink:to="lab_cost_OntoInnovationInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_OPENLANEInc.Member_label_en-US" xlink:label="lab_cost_OPENLANEInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">OPENLANE Inc. [Member]</link:label>
    <link:label id="lab_cost_OPENLANEInc.Member_documentation_en-US" xlink:label="lab_cost_OPENLANEInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">OPENLANE Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_OPENLANEInc.Member" xlink:href="cost-20251231.xsd#cost_OPENLANEInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_OPENLANEInc.Member" xlink:to="lab_cost_OPENLANEInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_OscarHealthInc.ClassAMember_label_en-US" xlink:label="lab_cost_OscarHealthInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Oscar Health Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_OscarHealthInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_OscarHealthInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Oscar Health Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_OscarHealthInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_OscarHealthInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_OscarHealthInc.ClassAMember" xlink:to="lab_cost_OscarHealthInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_PARTechnologyCorpDelMember_label_en-US" xlink:label="lab_cost_PARTechnologyCorpDelMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PAR Technology Corp/Del [Member]</link:label>
    <link:label id="lab_cost_PARTechnologyCorpDelMember_documentation_en-US" xlink:label="lab_cost_PARTechnologyCorpDelMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">PAR Technology Corp/Del</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_PARTechnologyCorpDelMember" xlink:href="cost-20251231.xsd#cost_PARTechnologyCorpDelMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_PARTechnologyCorpDelMember" xlink:to="lab_cost_PARTechnologyCorpDelMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ParsonsCorp.Member_label_en-US" xlink:label="lab_cost_ParsonsCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Parsons Corp. [Member]</link:label>
    <link:label id="lab_cost_ParsonsCorp.Member_documentation_en-US" xlink:label="lab_cost_ParsonsCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Parsons Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ParsonsCorp.Member" xlink:href="cost-20251231.xsd#cost_ParsonsCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ParsonsCorp.Member" xlink:to="lab_cost_ParsonsCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_PatrickIndustriesInc.Member_label_en-US" xlink:label="lab_cost_PatrickIndustriesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Patrick Industries Inc. [Member]</link:label>
    <link:label id="lab_cost_PatrickIndustriesInc.Member_documentation_en-US" xlink:label="lab_cost_PatrickIndustriesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Patrick Industries Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_PatrickIndustriesInc.Member" xlink:href="cost-20251231.xsd#cost_PatrickIndustriesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_PatrickIndustriesInc.Member" xlink:to="lab_cost_PatrickIndustriesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_PaxLabsInc.ClassAMember_label_en-US" xlink:label="lab_cost_PaxLabsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pax Labs Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_PaxLabsInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_PaxLabsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Pax Labs Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_PaxLabsInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_PaxLabsInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_PaxLabsInc.ClassAMember" xlink:to="lab_cost_PaxLabsInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_PennymacFinancialServicesMember_label_en-US" xlink:label="lab_cost_PennymacFinancialServicesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pennymac Financial Services [Member]</link:label>
    <link:label id="lab_cost_PennymacFinancialServicesMember_documentation_en-US" xlink:label="lab_cost_PennymacFinancialServicesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Pennymac Financial Services</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_PennymacFinancialServicesMember" xlink:href="cost-20251231.xsd#cost_PennymacFinancialServicesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_PennymacFinancialServicesMember" xlink:to="lab_cost_PennymacFinancialServicesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_PenumbraInc.Member_label_en-US" xlink:label="lab_cost_PenumbraInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Penumbra Inc. [Member]</link:label>
    <link:label id="lab_cost_PenumbraInc.Member_documentation_en-US" xlink:label="lab_cost_PenumbraInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Penumbra Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_PenumbraInc.Member" xlink:href="cost-20251231.xsd#cost_PenumbraInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_PenumbraInc.Member" xlink:to="lab_cost_PenumbraInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_PersonalisInc.Member_label_en-US" xlink:label="lab_cost_PersonalisInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Personalis Inc. [Member]</link:label>
    <link:label id="lab_cost_PersonalisInc.Member_documentation_en-US" xlink:label="lab_cost_PersonalisInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Personalis Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_PersonalisInc.Member" xlink:href="cost-20251231.xsd#cost_PersonalisInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_PersonalisInc.Member" xlink:to="lab_cost_PersonalisInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_PinnacleFinancialPartnersMember_label_en-US" xlink:label="lab_cost_PinnacleFinancialPartnersMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pinnacle Financial Partners [Member]</link:label>
    <link:label id="lab_cost_PinnacleFinancialPartnersMember_documentation_en-US" xlink:label="lab_cost_PinnacleFinancialPartnersMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Pinnacle Financial Partners</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_PinnacleFinancialPartnersMember" xlink:href="cost-20251231.xsd#cost_PinnacleFinancialPartnersMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_PinnacleFinancialPartnersMember" xlink:to="lab_cost_PinnacleFinancialPartnersMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_PJTPartnersInc.ClassAMember_label_en-US" xlink:label="lab_cost_PJTPartnersInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PJT Partners Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_PJTPartnersInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_PJTPartnersInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">PJT Partners Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_PJTPartnersInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_PJTPartnersInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_PJTPartnersInc.ClassAMember" xlink:to="lab_cost_PJTPartnersInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_PraxisPrecisionMedicinesInc.Member_label_en-US" xlink:label="lab_cost_PraxisPrecisionMedicinesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Praxis Precision Medicines Inc. [Member]</link:label>
    <link:label id="lab_cost_PraxisPrecisionMedicinesInc.Member_documentation_en-US" xlink:label="lab_cost_PraxisPrecisionMedicinesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Praxis Precision Medicines Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_PraxisPrecisionMedicinesInc.Member" xlink:href="cost-20251231.xsd#cost_PraxisPrecisionMedicinesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_PraxisPrecisionMedicinesInc.Member" xlink:to="lab_cost_PraxisPrecisionMedicinesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_PriceSmartInc.Member_label_en-US" xlink:label="lab_cost_PriceSmartInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PriceSmart Inc. [Member]</link:label>
    <link:label id="lab_cost_PriceSmartInc.Member_documentation_en-US" xlink:label="lab_cost_PriceSmartInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">PriceSmart Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_PriceSmartInc.Member" xlink:href="cost-20251231.xsd#cost_PriceSmartInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_PriceSmartInc.Member" xlink:to="lab_cost_PriceSmartInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_PrimeMedicineInc.Member_label_en-US" xlink:label="lab_cost_PrimeMedicineInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Prime Medicine Inc. [Member]</link:label>
    <link:label id="lab_cost_PrimeMedicineInc.Member_documentation_en-US" xlink:label="lab_cost_PrimeMedicineInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Prime Medicine Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_PrimeMedicineInc.Member" xlink:href="cost-20251231.xsd#cost_PrimeMedicineInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_PrimeMedicineInc.Member" xlink:to="lab_cost_PrimeMedicineInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ProceptBioroboticsCorp.Member_label_en-US" xlink:label="lab_cost_ProceptBioroboticsCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Procept Biorobotics Corp. [Member]</link:label>
    <link:label id="lab_cost_ProceptBioroboticsCorp.Member_documentation_en-US" xlink:label="lab_cost_ProceptBioroboticsCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Procept Biorobotics Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ProceptBioroboticsCorp.Member" xlink:href="cost-20251231.xsd#cost_ProceptBioroboticsCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ProceptBioroboticsCorp.Member" xlink:to="lab_cost_ProceptBioroboticsCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ProsperityBancsharesInc.Member_label_en-US" xlink:label="lab_cost_ProsperityBancsharesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Prosperity Bancshares Inc. [Member]</link:label>
    <link:label id="lab_cost_ProsperityBancsharesInc.Member_documentation_en-US" xlink:label="lab_cost_ProsperityBancsharesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Prosperity Bancshares Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ProsperityBancsharesInc.Member" xlink:href="cost-20251231.xsd#cost_ProsperityBancsharesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ProsperityBancsharesInc.Member" xlink:to="lab_cost_ProsperityBancsharesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_QXOInc.Member_label_en-US" xlink:label="lab_cost_QXOInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">QXO Inc. [Member]</link:label>
    <link:label id="lab_cost_QXOInc.Member_documentation_en-US" xlink:label="lab_cost_QXOInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">QXO Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_QXOInc.Member" xlink:href="cost-20251231.xsd#cost_QXOInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_QXOInc.Member" xlink:to="lab_cost_QXOInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_RadnetInc.Member_label_en-US" xlink:label="lab_cost_RadnetInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Radnet Inc. [Member]</link:label>
    <link:label id="lab_cost_RadnetInc.Member_documentation_en-US" xlink:label="lab_cost_RadnetInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Radnet Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_RadnetInc.Member" xlink:href="cost-20251231.xsd#cost_RadnetInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_RadnetInc.Member" xlink:to="lab_cost_RadnetInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_RambusInc.Member_label_en-US" xlink:label="lab_cost_RambusInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rambus Inc. [Member]</link:label>
    <link:label id="lab_cost_RambusInc.Member_documentation_en-US" xlink:label="lab_cost_RambusInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Rambus Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_RambusInc.Member" xlink:href="cost-20251231.xsd#cost_RambusInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_RambusInc.Member" xlink:to="lab_cost_RambusInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_RBCBearingsInc.Member_label_en-US" xlink:label="lab_cost_RBCBearingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">RBC Bearings Inc. [Member]</link:label>
    <link:label id="lab_cost_RBCBearingsInc.Member_documentation_en-US" xlink:label="lab_cost_RBCBearingsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">RBC Bearings Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_RBCBearingsInc.Member" xlink:href="cost-20251231.xsd#cost_RBCBearingsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_RBCBearingsInc.Member" xlink:to="lab_cost_RBCBearingsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_RedRockResortsInc.ClassAMember_label_en-US" xlink:label="lab_cost_RedRockResortsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Red Rock Resorts Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_RedRockResortsInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_RedRockResortsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Red Rock Resorts Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_RedRockResortsInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_RedRockResortsInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_RedRockResortsInc.ClassAMember" xlink:to="lab_cost_RedRockResortsInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_RenasantCorporationMember_label_en-US" xlink:label="lab_cost_RenasantCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Renasant Corporation [Member]</link:label>
    <link:label id="lab_cost_RenasantCorporationMember_documentation_en-US" xlink:label="lab_cost_RenasantCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Renasant Corporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_RenasantCorporationMember" xlink:href="cost-20251231.xsd#cost_RenasantCorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_RenasantCorporationMember" xlink:to="lab_cost_RenasantCorporationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_RepligenCorp.Member_label_en-US" xlink:label="lab_cost_RepligenCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Repligen Corp. [Member]</link:label>
    <link:label id="lab_cost_RepligenCorp.Member_documentation_en-US" xlink:label="lab_cost_RepligenCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Repligen Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_RepligenCorp.Member" xlink:href="cost-20251231.xsd#cost_RepligenCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_RepligenCorp.Member" xlink:to="lab_cost_RepligenCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_RiotPlatformsInc.Member_label_en-US" xlink:label="lab_cost_RiotPlatformsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Riot Platforms Inc. [Member]</link:label>
    <link:label id="lab_cost_RiotPlatformsInc.Member_documentation_en-US" xlink:label="lab_cost_RiotPlatformsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Riot Platforms Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_RiotPlatformsInc.Member" xlink:href="cost-20251231.xsd#cost_RiotPlatformsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_RiotPlatformsInc.Member" xlink:to="lab_cost_RiotPlatformsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_RLICorp.Member_label_en-US" xlink:label="lab_cost_RLICorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">RLI Corp. [Member]</link:label>
    <link:label id="lab_cost_RLICorp.Member_documentation_en-US" xlink:label="lab_cost_RLICorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">RLI Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_RLICorp.Member" xlink:href="cost-20251231.xsd#cost_RLICorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_RLICorp.Member" xlink:to="lab_cost_RLICorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_RocketCompaniesInc.ClassAMember_label_en-US" xlink:label="lab_cost_RocketCompaniesInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rocket Companies Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_RocketCompaniesInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_RocketCompaniesInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Rocket Companies Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_RocketCompaniesInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_RocketCompaniesInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_RocketCompaniesInc.ClassAMember" xlink:to="lab_cost_RocketCompaniesInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_RootInc.ClassAMember_label_en-US" xlink:label="lab_cost_RootInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Root Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_RootInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_RootInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Root Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_RootInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_RootInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_RootInc.ClassAMember" xlink:to="lab_cost_RootInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_RoyalGoldInc.Member_label_en-US" xlink:label="lab_cost_RoyalGoldInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Royal Gold Inc. [Member]</link:label>
    <link:label id="lab_cost_RoyalGoldInc.Member_documentation_en-US" xlink:label="lab_cost_RoyalGoldInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Royal Gold Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_RoyalGoldInc.Member" xlink:href="cost-20251231.xsd#cost_RoyalGoldInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_RoyalGoldInc.Member" xlink:to="lab_cost_RoyalGoldInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_RushEnterprisesInc.ClassAMember_label_en-US" xlink:label="lab_cost_RushEnterprisesInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rush Enterprises Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_RushEnterprisesInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_RushEnterprisesInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Rush Enterprises Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_RushEnterprisesInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_RushEnterprisesInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_RushEnterprisesInc.ClassAMember" xlink:to="lab_cost_RushEnterprisesInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_SaiaInc.Member_label_en-US" xlink:label="lab_cost_SaiaInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Saia Inc. [Member]</link:label>
    <link:label id="lab_cost_SaiaInc.Member_documentation_en-US" xlink:label="lab_cost_SaiaInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Saia Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_SaiaInc.Member" xlink:href="cost-20251231.xsd#cost_SaiaInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_SaiaInc.Member" xlink:to="lab_cost_SaiaInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_SaversValueVillageInc.Member_label_en-US" xlink:label="lab_cost_SaversValueVillageInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Savers Value Village Inc. [Member]</link:label>
    <link:label id="lab_cost_SaversValueVillageInc.Member_documentation_en-US" xlink:label="lab_cost_SaversValueVillageInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Savers Value Village Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_SaversValueVillageInc.Member" xlink:href="cost-20251231.xsd#cost_SaversValueVillageInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_SaversValueVillageInc.Member" xlink:to="lab_cost_SaversValueVillageInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_SemtechCorporationMember_label_en-US" xlink:label="lab_cost_SemtechCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Semtech Corporation [Member]</link:label>
    <link:label id="lab_cost_SemtechCorporationMember_documentation_en-US" xlink:label="lab_cost_SemtechCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Semtech Corporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_SemtechCorporationMember" xlink:href="cost-20251231.xsd#cost_SemtechCorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_SemtechCorporationMember" xlink:to="lab_cost_SemtechCorporationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_SimplyGoodFoodsCoTheMember_label_en-US" xlink:label="lab_cost_SimplyGoodFoodsCoTheMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Simply Good Foods Co/The [Member]</link:label>
    <link:label id="lab_cost_SimplyGoodFoodsCoTheMember_documentation_en-US" xlink:label="lab_cost_SimplyGoodFoodsCoTheMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Simply Good Foods Co/The</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_SimplyGoodFoodsCoTheMember" xlink:href="cost-20251231.xsd#cost_SimplyGoodFoodsCoTheMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_SimplyGoodFoodsCoTheMember" xlink:to="lab_cost_SimplyGoodFoodsCoTheMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_SimpsonManufacturingCo.Inc.Member_label_en-US" xlink:label="lab_cost_SimpsonManufacturingCo.Inc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Simpson Manufacturing Co. Inc. [Member]</link:label>
    <link:label id="lab_cost_SimpsonManufacturingCo.Inc.Member_documentation_en-US" xlink:label="lab_cost_SimpsonManufacturingCo.Inc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Simpson Manufacturing Co. Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_SimpsonManufacturingCo.Inc.Member" xlink:href="cost-20251231.xsd#cost_SimpsonManufacturingCo.Inc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_SimpsonManufacturingCo.Inc.Member" xlink:to="lab_cost_SimpsonManufacturingCo.Inc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_SiteoneLandscapeSupplyInc.Member_label_en-US" xlink:label="lab_cost_SiteoneLandscapeSupplyInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Siteone Landscape Supply Inc. [Member]</link:label>
    <link:label id="lab_cost_SiteoneLandscapeSupplyInc.Member_documentation_en-US" xlink:label="lab_cost_SiteoneLandscapeSupplyInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Siteone Landscape Supply Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_SiteoneLandscapeSupplyInc.Member" xlink:href="cost-20251231.xsd#cost_SiteoneLandscapeSupplyInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_SiteoneLandscapeSupplyInc.Member" xlink:to="lab_cost_SiteoneLandscapeSupplyInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_SiTimeCorporationMember_label_en-US" xlink:label="lab_cost_SiTimeCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SiTime Corporation [Member]</link:label>
    <link:label id="lab_cost_SiTimeCorporationMember_documentation_en-US" xlink:label="lab_cost_SiTimeCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">SiTime Corporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_SiTimeCorporationMember" xlink:href="cost-20251231.xsd#cost_SiTimeCorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_SiTimeCorporationMember" xlink:to="lab_cost_SiTimeCorporationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_SoteraHealthCo.Member_label_en-US" xlink:label="lab_cost_SoteraHealthCo.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sotera Health Co. [Member]</link:label>
    <link:label id="lab_cost_SoteraHealthCo.Member_documentation_en-US" xlink:label="lab_cost_SoteraHealthCo.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Sotera Health Co.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_SoteraHealthCo.Member" xlink:href="cost-20251231.xsd#cost_SoteraHealthCo.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_SoteraHealthCo.Member" xlink:to="lab_cost_SoteraHealthCo.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_SouthStateBankCorporationMember_label_en-US" xlink:label="lab_cost_SouthStateBankCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SouthState Bank Corporation [Member]</link:label>
    <link:label id="lab_cost_SouthStateBankCorporationMember_documentation_en-US" xlink:label="lab_cost_SouthStateBankCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">SouthState Bank Corporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_SouthStateBankCorporationMember" xlink:href="cost-20251231.xsd#cost_SouthStateBankCorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_SouthStateBankCorporationMember" xlink:to="lab_cost_SouthStateBankCorporationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_SPXTechnologiesInc.Member_label_en-US" xlink:label="lab_cost_SPXTechnologiesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SPX Technologies Inc. [Member]</link:label>
    <link:label id="lab_cost_SPXTechnologiesInc.Member_documentation_en-US" xlink:label="lab_cost_SPXTechnologiesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">SPX Technologies Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_SPXTechnologiesInc.Member" xlink:href="cost-20251231.xsd#cost_SPXTechnologiesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_SPXTechnologiesInc.Member" xlink:to="lab_cost_SPXTechnologiesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_StandexInternationalCorporationMember_label_en-US" xlink:label="lab_cost_StandexInternationalCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Standex International Corporation [Member]</link:label>
    <link:label id="lab_cost_StandexInternationalCorporationMember_documentation_en-US" xlink:label="lab_cost_StandexInternationalCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Standex International Corporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_StandexInternationalCorporationMember" xlink:href="cost-20251231.xsd#cost_StandexInternationalCorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_StandexInternationalCorporationMember" xlink:to="lab_cost_StandexInternationalCorporationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_StepstoneGroupInc.ClassAMember_label_en-US" xlink:label="lab_cost_StepstoneGroupInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stepstone Group Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_StepstoneGroupInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_StepstoneGroupInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Stepstone Group Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_StepstoneGroupInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_StepstoneGroupInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_StepstoneGroupInc.ClassAMember" xlink:to="lab_cost_StepstoneGroupInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_StifelFinancialCorp.Member_label_en-US" xlink:label="lab_cost_StifelFinancialCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stifel Financial Corp. [Member]</link:label>
    <link:label id="lab_cost_StifelFinancialCorp.Member_documentation_en-US" xlink:label="lab_cost_StifelFinancialCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Stifel Financial Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_StifelFinancialCorp.Member" xlink:href="cost-20251231.xsd#cost_StifelFinancialCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_StifelFinancialCorp.Member" xlink:to="lab_cost_StifelFinancialCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_StoneXGroupInc.Member_label_en-US" xlink:label="lab_cost_StoneXGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">StoneX Group Inc. [Member]</link:label>
    <link:label id="lab_cost_StoneXGroupInc.Member_documentation_en-US" xlink:label="lab_cost_StoneXGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">StoneX Group Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_StoneXGroupInc.Member" xlink:href="cost-20251231.xsd#cost_StoneXGroupInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_StoneXGroupInc.Member" xlink:to="lab_cost_StoneXGroupInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_SurgeryPartnersInc.Member_label_en-US" xlink:label="lab_cost_SurgeryPartnersInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Surgery Partners Inc. [Member]</link:label>
    <link:label id="lab_cost_SurgeryPartnersInc.Member_documentation_en-US" xlink:label="lab_cost_SurgeryPartnersInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Surgery Partners Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_SurgeryPartnersInc.Member" xlink:href="cost-20251231.xsd#cost_SurgeryPartnersInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_SurgeryPartnersInc.Member" xlink:to="lab_cost_SurgeryPartnersInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TeledyneTechnologiesInc.Member_label_en-US" xlink:label="lab_cost_TeledyneTechnologiesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Teledyne Technologies Inc. [Member]</link:label>
    <link:label id="lab_cost_TeledyneTechnologiesInc.Member_documentation_en-US" xlink:label="lab_cost_TeledyneTechnologiesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Teledyne Technologies Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TeledyneTechnologiesInc.Member" xlink:href="cost-20251231.xsd#cost_TeledyneTechnologiesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TeledyneTechnologiesInc.Member" xlink:to="lab_cost_TeledyneTechnologiesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TerrenoRealtyCorp.Member_label_en-US" xlink:label="lab_cost_TerrenoRealtyCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Terreno Realty Corp. [Member]</link:label>
    <link:label id="lab_cost_TerrenoRealtyCorp.Member_documentation_en-US" xlink:label="lab_cost_TerrenoRealtyCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Terreno Realty Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TerrenoRealtyCorp.Member" xlink:href="cost-20251231.xsd#cost_TerrenoRealtyCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TerrenoRealtyCorp.Member" xlink:to="lab_cost_TerrenoRealtyCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TexasCapitalBancsharesInc.Member_label_en-US" xlink:label="lab_cost_TexasCapitalBancsharesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Texas Capital Bancshares Inc. [Member]</link:label>
    <link:label id="lab_cost_TexasCapitalBancsharesInc.Member_documentation_en-US" xlink:label="lab_cost_TexasCapitalBancsharesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Texas Capital Bancshares Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TexasCapitalBancsharesInc.Member" xlink:href="cost-20251231.xsd#cost_TexasCapitalBancsharesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TexasCapitalBancsharesInc.Member" xlink:to="lab_cost_TexasCapitalBancsharesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TheEnsignGroupInc.Member_label_en-US" xlink:label="lab_cost_TheEnsignGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">The Ensign Group Inc. [Member]</link:label>
    <link:label id="lab_cost_TheEnsignGroupInc.Member_documentation_en-US" xlink:label="lab_cost_TheEnsignGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The Ensign Group Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TheEnsignGroupInc.Member" xlink:href="cost-20251231.xsd#cost_TheEnsignGroupInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TheEnsignGroupInc.Member" xlink:to="lab_cost_TheEnsignGroupInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TheMacerichCompanyMember_label_en-US" xlink:label="lab_cost_TheMacerichCompanyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">The Macerich Company [Member]</link:label>
    <link:label id="lab_cost_TheMacerichCompanyMember_documentation_en-US" xlink:label="lab_cost_TheMacerichCompanyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The Macerich Company</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TheMacerichCompanyMember" xlink:href="cost-20251231.xsd#cost_TheMacerichCompanyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TheMacerichCompanyMember" xlink:to="lab_cost_TheMacerichCompanyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TheMiddlebyCorporationMember_label_en-US" xlink:label="lab_cost_TheMiddlebyCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">The Middleby Corporation [Member]</link:label>
    <link:label id="lab_cost_TheMiddlebyCorporationMember_documentation_en-US" xlink:label="lab_cost_TheMiddlebyCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The Middleby Corporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TheMiddlebyCorporationMember" xlink:href="cost-20251231.xsd#cost_TheMiddlebyCorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TheMiddlebyCorporationMember" xlink:to="lab_cost_TheMiddlebyCorporationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TurningPointBrandsInc.Member_label_en-US" xlink:label="lab_cost_TurningPointBrandsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Turning Point Brands Inc. [Member]</link:label>
    <link:label id="lab_cost_TurningPointBrandsInc.Member_documentation_en-US" xlink:label="lab_cost_TurningPointBrandsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Turning Point Brands Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TurningPointBrandsInc.Member" xlink:href="cost-20251231.xsd#cost_TurningPointBrandsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TurningPointBrandsInc.Member" xlink:to="lab_cost_TurningPointBrandsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TWFGInc.ClassAMember_label_en-US" xlink:label="lab_cost_TWFGInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">TWFG Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_TWFGInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_TWFGInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">TWFG Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TWFGInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_TWFGInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TWFGInc.ClassAMember" xlink:to="lab_cost_TWFGInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TXNMEnergyInc.Member_label_en-US" xlink:label="lab_cost_TXNMEnergyInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">TXNM Energy Inc. [Member]</link:label>
    <link:label id="lab_cost_TXNMEnergyInc.Member_documentation_en-US" xlink:label="lab_cost_TXNMEnergyInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">TXNM Energy Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TXNMEnergyInc.Member" xlink:href="cost-20251231.xsd#cost_TXNMEnergyInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TXNMEnergyInc.Member" xlink:to="lab_cost_TXNMEnergyInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_UnitedStatesLimeMineralsInc.Member_label_en-US" xlink:label="lab_cost_UnitedStatesLimeMineralsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">United States Lime &amp; Minerals Inc. [Member]</link:label>
    <link:label id="lab_cost_UnitedStatesLimeMineralsInc.Member_documentation_en-US" xlink:label="lab_cost_UnitedStatesLimeMineralsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">United States Lime &amp; Minerals Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_UnitedStatesLimeMineralsInc.Member" xlink:href="cost-20251231.xsd#cost_UnitedStatesLimeMineralsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_UnitedStatesLimeMineralsInc.Member" xlink:to="lab_cost_UnitedStatesLimeMineralsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_UnitiGroupInc.Member_label_en-US" xlink:label="lab_cost_UnitiGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Uniti Group Inc. [Member]</link:label>
    <link:label id="lab_cost_UnitiGroupInc.Member_documentation_en-US" xlink:label="lab_cost_UnitiGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Uniti Group Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_UnitiGroupInc.Member" xlink:href="cost-20251231.xsd#cost_UnitiGroupInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_UnitiGroupInc.Member" xlink:to="lab_cost_UnitiGroupInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_UraniumEnergyCorp.Member_label_en-US" xlink:label="lab_cost_UraniumEnergyCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Uranium Energy Corp. [Member]</link:label>
    <link:label id="lab_cost_UraniumEnergyCorp.Member_documentation_en-US" xlink:label="lab_cost_UraniumEnergyCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Uranium Energy Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_UraniumEnergyCorp.Member" xlink:href="cost-20251231.xsd#cost_UraniumEnergyCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_UraniumEnergyCorp.Member" xlink:to="lab_cost_UraniumEnergyCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_UrbanOutfittersInc.Member_label_en-US" xlink:label="lab_cost_UrbanOutfittersInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Urban Outfitters Inc. [Member]</link:label>
    <link:label id="lab_cost_UrbanOutfittersInc.Member_documentation_en-US" xlink:label="lab_cost_UrbanOutfittersInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Urban Outfitters Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_UrbanOutfittersInc.Member" xlink:href="cost-20251231.xsd#cost_UrbanOutfittersInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_UrbanOutfittersInc.Member" xlink:to="lab_cost_UrbanOutfittersInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_USCBFinancialHoldingsInc.ClassAMember_label_en-US" xlink:label="lab_cost_USCBFinancialHoldingsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">USCB Financial Holdings Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_USCBFinancialHoldingsInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_USCBFinancialHoldingsInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">USCB Financial Holdings Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_USCBFinancialHoldingsInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_USCBFinancialHoldingsInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_USCBFinancialHoldingsInc.ClassAMember" xlink:to="lab_cost_USCBFinancialHoldingsInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ViperEnergyInc.Member_label_en-US" xlink:label="lab_cost_ViperEnergyInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Viper Energy Inc. [Member]</link:label>
    <link:label id="lab_cost_ViperEnergyInc.Member_documentation_en-US" xlink:label="lab_cost_ViperEnergyInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Viper Energy Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ViperEnergyInc.Member" xlink:href="cost-20251231.xsd#cost_ViperEnergyInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ViperEnergyInc.Member" xlink:to="lab_cost_ViperEnergyInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_VSECorp.Member_label_en-US" xlink:label="lab_cost_VSECorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">VSE Corp. [Member]</link:label>
    <link:label id="lab_cost_VSECorp.Member_documentation_en-US" xlink:label="lab_cost_VSECorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">VSE Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_VSECorp.Member" xlink:href="cost-20251231.xsd#cost_VSECorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_VSECorp.Member" xlink:to="lab_cost_VSECorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_WarriorMetCoalInc.Member_label_en-US" xlink:label="lab_cost_WarriorMetCoalInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Warrior Met Coal Inc. [Member]</link:label>
    <link:label id="lab_cost_WarriorMetCoalInc.Member_documentation_en-US" xlink:label="lab_cost_WarriorMetCoalInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Warrior Met Coal Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_WarriorMetCoalInc.Member" xlink:href="cost-20251231.xsd#cost_WarriorMetCoalInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_WarriorMetCoalInc.Member" xlink:to="lab_cost_WarriorMetCoalInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_WealthfrontCorporationMember_label_en-US" xlink:label="lab_cost_WealthfrontCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Wealthfront Corporation [Member]</link:label>
    <link:label id="lab_cost_WealthfrontCorporationMember_documentation_en-US" xlink:label="lab_cost_WealthfrontCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Wealthfront Corporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_WealthfrontCorporationMember" xlink:href="cost-20251231.xsd#cost_WealthfrontCorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_WealthfrontCorporationMember" xlink:to="lab_cost_WealthfrontCorporationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_WeatherfordInternationalPLCMember_label_en-US" xlink:label="lab_cost_WeatherfordInternationalPLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weatherford International PLC [Member]</link:label>
    <link:label id="lab_cost_WeatherfordInternationalPLCMember_documentation_en-US" xlink:label="lab_cost_WeatherfordInternationalPLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Weatherford International PLC</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_WeatherfordInternationalPLCMember" xlink:href="cost-20251231.xsd#cost_WeatherfordInternationalPLCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_WeatherfordInternationalPLCMember" xlink:to="lab_cost_WeatherfordInternationalPLCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_WesternAllianceBancorporationMember_label_en-US" xlink:label="lab_cost_WesternAllianceBancorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Western Alliance Bancorporation [Member]</link:label>
    <link:label id="lab_cost_WesternAllianceBancorporationMember_documentation_en-US" xlink:label="lab_cost_WesternAllianceBancorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Western Alliance Bancorporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_WesternAllianceBancorporationMember" xlink:href="cost-20251231.xsd#cost_WesternAllianceBancorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_WesternAllianceBancorporationMember" xlink:to="lab_cost_WesternAllianceBancorporationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_WhiteMountainsInsuranceGroupLtd.Member_label_en-US" xlink:label="lab_cost_WhiteMountainsInsuranceGroupLtd.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">White Mountains Insurance Group Ltd. [Member]</link:label>
    <link:label id="lab_cost_WhiteMountainsInsuranceGroupLtd.Member_documentation_en-US" xlink:label="lab_cost_WhiteMountainsInsuranceGroupLtd.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">White Mountains Insurance Group Ltd.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_WhiteMountainsInsuranceGroupLtd.Member" xlink:href="cost-20251231.xsd#cost_WhiteMountainsInsuranceGroupLtd.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_WhiteMountainsInsuranceGroupLtd.Member" xlink:to="lab_cost_WhiteMountainsInsuranceGroupLtd.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_WillscotHoldingsCorp.Member_label_en-US" xlink:label="lab_cost_WillscotHoldingsCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Willscot Holdings Corp. [Member]</link:label>
    <link:label id="lab_cost_WillscotHoldingsCorp.Member_documentation_en-US" xlink:label="lab_cost_WillscotHoldingsCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Willscot Holdings Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_WillscotHoldingsCorp.Member" xlink:href="cost-20251231.xsd#cost_WillscotHoldingsCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_WillscotHoldingsCorp.Member" xlink:to="lab_cost_WillscotHoldingsCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_WorkivaInc.ClassAMember_label_en-US" xlink:label="lab_cost_WorkivaInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Workiva Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_WorkivaInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_WorkivaInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Workiva Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_WorkivaInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_WorkivaInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_WorkivaInc.ClassAMember" xlink:to="lab_cost_WorkivaInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_XometryInc.ClassAMember_label_en-US" xlink:label="lab_cost_XometryInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Xometry Inc., Class A [Member]</link:label>
    <link:label id="lab_cost_XometryInc.ClassAMember_documentation_en-US" xlink:label="lab_cost_XometryInc.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Xometry Inc., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_XometryInc.ClassAMember" xlink:href="cost-20251231.xsd#cost_XometryInc.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_XometryInc.ClassAMember" xlink:to="lab_cost_XometryInc.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BirkenstockHoldingPLCMember_label_en-US" xlink:label="lab_cost_BirkenstockHoldingPLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Birkenstock Holding PLC [Member]</link:label>
    <link:label id="lab_cost_BirkenstockHoldingPLCMember_documentation_en-US" xlink:label="lab_cost_BirkenstockHoldingPLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Birkenstock Holding PLC</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BirkenstockHoldingPLCMember" xlink:href="cost-20251231.xsd#cost_BirkenstockHoldingPLCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BirkenstockHoldingPLCMember" xlink:to="lab_cost_BirkenstockHoldingPLCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CapstoneCopperCorp.Member_label_en-US" xlink:label="lab_cost_CapstoneCopperCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capstone Copper Corp. [Member]</link:label>
    <link:label id="lab_cost_CapstoneCopperCorp.Member_documentation_en-US" xlink:label="lab_cost_CapstoneCopperCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Capstone Copper Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CapstoneCopperCorp.Member" xlink:href="cost-20251231.xsd#cost_CapstoneCopperCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CapstoneCopperCorp.Member" xlink:to="lab_cost_CapstoneCopperCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CellebriteDILtd.Member_label_en-US" xlink:label="lab_cost_CellebriteDILtd.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cellebrite DI Ltd. [Member]</link:label>
    <link:label id="lab_cost_CellebriteDILtd.Member_documentation_en-US" xlink:label="lab_cost_CellebriteDILtd.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cellebrite DI Ltd.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CellebriteDILtd.Member" xlink:href="cost-20251231.xsd#cost_CellebriteDILtd.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CellebriteDILtd.Member" xlink:to="lab_cost_CellebriteDILtd.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CenovusEnergyInc.Member_label_en-US" xlink:label="lab_cost_CenovusEnergyInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cenovus Energy Inc. [Member]</link:label>
    <link:label id="lab_cost_CenovusEnergyInc.Member_documentation_en-US" xlink:label="lab_cost_CenovusEnergyInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cenovus Energy Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CenovusEnergyInc.Member" xlink:href="cost-20251231.xsd#cost_CenovusEnergyInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CenovusEnergyInc.Member" xlink:to="lab_cost_CenovusEnergyInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ColliersInternationalGroupInc.Member_label_en-US" xlink:label="lab_cost_ColliersInternationalGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Colliers International Group Inc. [Member]</link:label>
    <link:label id="lab_cost_ColliersInternationalGroupInc.Member_documentation_en-US" xlink:label="lab_cost_ColliersInternationalGroupInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Colliers International Group Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ColliersInternationalGroupInc.Member" xlink:href="cost-20251231.xsd#cost_ColliersInternationalGroupInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ColliersInternationalGroupInc.Member" xlink:to="lab_cost_ColliersInternationalGroupInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_DefinityFinancialCorporationMember_label_en-US" xlink:label="lab_cost_DefinityFinancialCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Definity Financial Corporation [Member]</link:label>
    <link:label id="lab_cost_DefinityFinancialCorporationMember_documentation_en-US" xlink:label="lab_cost_DefinityFinancialCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Definity Financial Corporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_DefinityFinancialCorporationMember" xlink:href="cost-20251231.xsd#cost_DefinityFinancialCorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_DefinityFinancialCorporationMember" xlink:to="lab_cost_DefinityFinancialCorporationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_DenisonMinesCorp.Member_label_en-US" xlink:label="lab_cost_DenisonMinesCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Denison Mines Corp. [Member]</link:label>
    <link:label id="lab_cost_DenisonMinesCorp.Member_documentation_en-US" xlink:label="lab_cost_DenisonMinesCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Denison Mines Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_DenisonMinesCorp.Member" xlink:href="cost-20251231.xsd#cost_DenisonMinesCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_DenisonMinesCorp.Member" xlink:to="lab_cost_DenisonMinesCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_DescartesSystemsGroupTheMember_label_en-US" xlink:label="lab_cost_DescartesSystemsGroupTheMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Descartes Systems Group/The [Member]</link:label>
    <link:label id="lab_cost_DescartesSystemsGroupTheMember_documentation_en-US" xlink:label="lab_cost_DescartesSystemsGroupTheMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Descartes Systems Group/The</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_DescartesSystemsGroupTheMember" xlink:href="cost-20251231.xsd#cost_DescartesSystemsGroupTheMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_DescartesSystemsGroupTheMember" xlink:to="lab_cost_DescartesSystemsGroupTheMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_DiplomaPLCMember_label_en-US" xlink:label="lab_cost_DiplomaPLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Diploma PLC [Member]</link:label>
    <link:label id="lab_cost_DiplomaPLCMember_documentation_en-US" xlink:label="lab_cost_DiplomaPLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Diploma PLC</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_DiplomaPLCMember" xlink:href="cost-20251231.xsd#cost_DiplomaPLCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_DiplomaPLCMember" xlink:to="lab_cost_DiplomaPLCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EToroGroupLtd.ClassAMember_label_en-US" xlink:label="lab_cost_EToroGroupLtd.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">eToro Group Ltd., Class A [Member]</link:label>
    <link:label id="lab_cost_EToroGroupLtd.ClassAMember_documentation_en-US" xlink:label="lab_cost_EToroGroupLtd.ClassAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">eToro Group Ltd., Class A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EToroGroupLtd.ClassAMember" xlink:href="cost-20251231.xsd#cost_EToroGroupLtd.ClassAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EToroGroupLtd.ClassAMember" xlink:to="lab_cost_EToroGroupLtd.ClassAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_FabrinetMember_label_en-US" xlink:label="lab_cost_FabrinetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fabrinet [Member]</link:label>
    <link:label id="lab_cost_FabrinetMember_documentation_en-US" xlink:label="lab_cost_FabrinetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Fabrinet</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_FabrinetMember" xlink:href="cost-20251231.xsd#cost_FabrinetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_FabrinetMember" xlink:to="lab_cost_FabrinetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_FirstserviceCorp.Member_label_en-US" xlink:label="lab_cost_FirstserviceCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Firstservice Corp. [Member]</link:label>
    <link:label id="lab_cost_FirstserviceCorp.Member_documentation_en-US" xlink:label="lab_cost_FirstserviceCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Firstservice Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_FirstserviceCorp.Member" xlink:href="cost-20251231.xsd#cost_FirstserviceCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_FirstserviceCorp.Member" xlink:to="lab_cost_FirstserviceCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_GolarLNGLimitedMember_label_en-US" xlink:label="lab_cost_GolarLNGLimitedMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Golar LNG Limited [Member]</link:label>
    <link:label id="lab_cost_GolarLNGLimitedMember_documentation_en-US" xlink:label="lab_cost_GolarLNGLimitedMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Golar LNG Limited</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_GolarLNGLimitedMember" xlink:href="cost-20251231.xsd#cost_GolarLNGLimitedMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_GolarLNGLimitedMember" xlink:to="lab_cost_GolarLNGLimitedMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ImmaticsNVMember_label_en-US" xlink:label="lab_cost_ImmaticsNVMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Immatics NV [Member]</link:label>
    <link:label id="lab_cost_ImmaticsNVMember_documentation_en-US" xlink:label="lab_cost_ImmaticsNVMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Immatics NV</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ImmaticsNVMember" xlink:href="cost-20251231.xsd#cost_ImmaticsNVMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ImmaticsNVMember" xlink:to="lab_cost_ImmaticsNVMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ImmunocoreHoldingsPLCADRMember_label_en-US" xlink:label="lab_cost_ImmunocoreHoldingsPLCADRMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Immunocore Holdings PLC - ADR [Member]</link:label>
    <link:label id="lab_cost_ImmunocoreHoldingsPLCADRMember_documentation_en-US" xlink:label="lab_cost_ImmunocoreHoldingsPLCADRMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Immunocore Holdings PLC - ADR</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ImmunocoreHoldingsPLCADRMember" xlink:href="cost-20251231.xsd#cost_ImmunocoreHoldingsPLCADRMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ImmunocoreHoldingsPLCADRMember" xlink:to="lab_cost_ImmunocoreHoldingsPLCADRMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ORRoyaltiesInc.Member_label_en-US" xlink:label="lab_cost_ORRoyaltiesInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">OR Royalties Inc. [Member]</link:label>
    <link:label id="lab_cost_ORRoyaltiesInc.Member_documentation_en-US" xlink:label="lab_cost_ORRoyaltiesInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">OR Royalties Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ORRoyaltiesInc.Member" xlink:href="cost-20251231.xsd#cost_ORRoyaltiesInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ORRoyaltiesInc.Member" xlink:to="lab_cost_ORRoyaltiesInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_SECUREWasteInfrastructureCorp.Member_label_en-US" xlink:label="lab_cost_SECUREWasteInfrastructureCorp.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SECURE Waste Infrastructure Corp. [Member]</link:label>
    <link:label id="lab_cost_SECUREWasteInfrastructureCorp.Member_documentation_en-US" xlink:label="lab_cost_SECUREWasteInfrastructureCorp.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">SECURE Waste Infrastructure Corp.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_SECUREWasteInfrastructureCorp.Member" xlink:href="cost-20251231.xsd#cost_SECUREWasteInfrastructureCorp.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_SECUREWasteInfrastructureCorp.Member" xlink:to="lab_cost_SECUREWasteInfrastructureCorp.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_SpiraxGroupPLCMember_label_en-US" xlink:label="lab_cost_SpiraxGroupPLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Spirax Group PLC [Member]</link:label>
    <link:label id="lab_cost_SpiraxGroupPLCMember_documentation_en-US" xlink:label="lab_cost_SpiraxGroupPLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Spirax Group PLC</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_SpiraxGroupPLCMember" xlink:href="cost-20251231.xsd#cost_SpiraxGroupPLCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_SpiraxGroupPLCMember" xlink:to="lab_cost_SpiraxGroupPLCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_StevanatoGroupSpAMember_label_en-US" xlink:label="lab_cost_StevanatoGroupSpAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stevanato Group SpA [Member]</link:label>
    <link:label id="lab_cost_StevanatoGroupSpAMember_documentation_en-US" xlink:label="lab_cost_StevanatoGroupSpAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Stevanato Group SpA</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_StevanatoGroupSpAMember" xlink:href="cost-20251231.xsd#cost_StevanatoGroupSpAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_StevanatoGroupSpAMember" xlink:to="lab_cost_StevanatoGroupSpAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TMXGroupLtd.Member_label_en-US" xlink:label="lab_cost_TMXGroupLtd.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">TMX Group Ltd. [Member]</link:label>
    <link:label id="lab_cost_TMXGroupLtd.Member_documentation_en-US" xlink:label="lab_cost_TMXGroupLtd.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">TMX Group Ltd.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TMXGroupLtd.Member" xlink:href="cost-20251231.xsd#cost_TMXGroupLtd.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TMXGroupLtd.Member" xlink:to="lab_cost_TMXGroupLtd.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TowerSemiconductorInc.Member_label_en-US" xlink:label="lab_cost_TowerSemiconductorInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Tower Semiconductor Inc. [Member]</link:label>
    <link:label id="lab_cost_TowerSemiconductorInc.Member_documentation_en-US" xlink:label="lab_cost_TowerSemiconductorInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tower Semiconductor Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TowerSemiconductorInc.Member" xlink:href="cost-20251231.xsd#cost_TowerSemiconductorInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TowerSemiconductorInc.Member" xlink:to="lab_cost_TowerSemiconductorInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_WeirGroupADRMember_label_en-US" xlink:label="lab_cost_WeirGroupADRMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weir Group ADR [Member]</link:label>
    <link:label id="lab_cost_WeirGroupADRMember_documentation_en-US" xlink:label="lab_cost_WeirGroupADRMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Weir Group ADR</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_WeirGroupADRMember" xlink:href="cost-20251231.xsd#cost_WeirGroupADRMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_WeirGroupADRMember" xlink:to="lab_cost_WeirGroupADRMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_XenonPharmaceuticalsInc.Member_label_en-US" xlink:label="lab_cost_XenonPharmaceuticalsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Xenon Pharmaceuticals Inc. [Member]</link:label>
    <link:label id="lab_cost_XenonPharmaceuticalsInc.Member_documentation_en-US" xlink:label="lab_cost_XenonPharmaceuticalsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Xenon Pharmaceuticals Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_XenonPharmaceuticalsInc.Member" xlink:href="cost-20251231.xsd#cost_XenonPharmaceuticalsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_XenonPharmaceuticalsInc.Member" xlink:to="lab_cost_XenonPharmaceuticalsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_YpsomedHoldingAGMember_label_en-US" xlink:label="lab_cost_YpsomedHoldingAGMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ypsomed Holding AG [Member]</link:label>
    <link:label id="lab_cost_YpsomedHoldingAGMember_documentation_en-US" xlink:label="lab_cost_YpsomedHoldingAGMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Ypsomed Holding AG</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_YpsomedHoldingAGMember" xlink:href="cost-20251231.xsd#cost_YpsomedHoldingAGMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_YpsomedHoldingAGMember" xlink:to="lab_cost_YpsomedHoldingAGMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_A1661Inc.DBAGoatSeriesFConvertibleMember_label_en-US" xlink:label="lab_cost_A1661Inc.DBAGoatSeriesFConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">1661 Inc. D/B/A/ Goat, Series F Convertible [Member]</link:label>
    <link:label id="lab_cost_A1661Inc.DBAGoatSeriesFConvertibleMember_documentation_en-US" xlink:label="lab_cost_A1661Inc.DBAGoatSeriesFConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">1661 Inc. D/B/A/ Goat, Series F Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_A1661Inc.DBAGoatSeriesFConvertibleMember" xlink:href="cost-20251231.xsd#cost_A1661Inc.DBAGoatSeriesFConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_A1661Inc.DBAGoatSeriesFConvertibleMember" xlink:to="lab_cost_A1661Inc.DBAGoatSeriesFConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ABLSpaceSystemsSeriesA8Member_label_en-US" xlink:label="lab_cost_ABLSpaceSystemsSeriesA8Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ABL Space Systems, Series A-8 [Member]</link:label>
    <link:label id="lab_cost_ABLSpaceSystemsSeriesA8Member_documentation_en-US" xlink:label="lab_cost_ABLSpaceSystemsSeriesA8Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">ABL Space Systems, Series A-8</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ABLSpaceSystemsSeriesA8Member" xlink:href="cost-20251231.xsd#cost_ABLSpaceSystemsSeriesA8Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ABLSpaceSystemsSeriesA8Member" xlink:to="lab_cost_ABLSpaceSystemsSeriesA8Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CelllinkInc.SeriesDMember_label_en-US" xlink:label="lab_cost_CelllinkInc.SeriesDMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Celllink Inc., Series D [Member]</link:label>
    <link:label id="lab_cost_CelllinkInc.SeriesDMember_documentation_en-US" xlink:label="lab_cost_CelllinkInc.SeriesDMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Celllink Inc., Series D</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CelllinkInc.SeriesDMember" xlink:href="cost-20251231.xsd#cost_CelllinkInc.SeriesDMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CelllinkInc.SeriesDMember" xlink:to="lab_cost_CelllinkInc.SeriesDMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CheckrInc.SeriesCConvertibleMember_label_en-US" xlink:label="lab_cost_CheckrInc.SeriesCConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Checkr Inc., Series C Convertible [Member]</link:label>
    <link:label id="lab_cost_CheckrInc.SeriesCConvertibleMember_documentation_en-US" xlink:label="lab_cost_CheckrInc.SeriesCConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Checkr Inc., Series C Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CheckrInc.SeriesCConvertibleMember" xlink:href="cost-20251231.xsd#cost_CheckrInc.SeriesCConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CheckrInc.SeriesCConvertibleMember" xlink:to="lab_cost_CheckrInc.SeriesCConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CheckrInc.SeriesDConvertibleMember_label_en-US" xlink:label="lab_cost_CheckrInc.SeriesDConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Checkr Inc., Series D Convertible [Member]</link:label>
    <link:label id="lab_cost_CheckrInc.SeriesDConvertibleMember_documentation_en-US" xlink:label="lab_cost_CheckrInc.SeriesDConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Checkr Inc., Series D Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CheckrInc.SeriesDConvertibleMember" xlink:href="cost-20251231.xsd#cost_CheckrInc.SeriesDConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CheckrInc.SeriesDConvertibleMember" xlink:to="lab_cost_CheckrInc.SeriesDConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CleerlySeriesCConvertibleMember_label_en-US" xlink:label="lab_cost_CleerlySeriesCConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cleerly, Series C Convertible [Member]</link:label>
    <link:label id="lab_cost_CleerlySeriesCConvertibleMember_documentation_en-US" xlink:label="lab_cost_CleerlySeriesCConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cleerly, Series C Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CleerlySeriesCConvertibleMember" xlink:href="cost-20251231.xsd#cost_CleerlySeriesCConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CleerlySeriesCConvertibleMember" xlink:to="lab_cost_CleerlySeriesCConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CRBGroupSeriesDConvertibleMember_label_en-US" xlink:label="lab_cost_CRBGroupSeriesDConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">CRB Group, Series D Convertible [Member]</link:label>
    <link:label id="lab_cost_CRBGroupSeriesDConvertibleMember_documentation_en-US" xlink:label="lab_cost_CRBGroupSeriesDConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">CRB Group, Series D Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CRBGroupSeriesDConvertibleMember" xlink:href="cost-20251231.xsd#cost_CRBGroupSeriesDConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CRBGroupSeriesDConvertibleMember" xlink:to="lab_cost_CRBGroupSeriesDConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EpirusInc.SeriesC2ConvertibleMember_label_en-US" xlink:label="lab_cost_EpirusInc.SeriesC2ConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Epirus Inc., Series C-2 Convertible [Member]</link:label>
    <link:label id="lab_cost_EpirusInc.SeriesC2ConvertibleMember_documentation_en-US" xlink:label="lab_cost_EpirusInc.SeriesC2ConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Epirus Inc., Series C-2 Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EpirusInc.SeriesC2ConvertibleMember" xlink:href="cost-20251231.xsd#cost_EpirusInc.SeriesC2ConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EpirusInc.SeriesC2ConvertibleMember" xlink:to="lab_cost_EpirusInc.SeriesC2ConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_FlexeSeriesCConvertibleMember_label_en-US" xlink:label="lab_cost_FlexeSeriesCConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Flexe, Series C Convertible [Member]</link:label>
    <link:label id="lab_cost_FlexeSeriesCConvertibleMember_documentation_en-US" xlink:label="lab_cost_FlexeSeriesCConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Flexe, Series C Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_FlexeSeriesCConvertibleMember" xlink:href="cost-20251231.xsd#cost_FlexeSeriesCConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_FlexeSeriesCConvertibleMember" xlink:to="lab_cost_FlexeSeriesCConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_FlexeSeriesDConvertibleMember_label_en-US" xlink:label="lab_cost_FlexeSeriesDConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Flexe, Series D Convertible [Member]</link:label>
    <link:label id="lab_cost_FlexeSeriesDConvertibleMember_documentation_en-US" xlink:label="lab_cost_FlexeSeriesDConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Flexe, Series D Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_FlexeSeriesDConvertibleMember" xlink:href="cost-20251231.xsd#cost_FlexeSeriesDConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_FlexeSeriesDConvertibleMember" xlink:to="lab_cost_FlexeSeriesDConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_HaulHubSeriesBConvertibleMember_label_en-US" xlink:label="lab_cost_HaulHubSeriesBConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Haul Hub, Series B Convertible [Member]</link:label>
    <link:label id="lab_cost_HaulHubSeriesBConvertibleMember_documentation_en-US" xlink:label="lab_cost_HaulHubSeriesBConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Haul Hub, Series B Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_HaulHubSeriesBConvertibleMember" xlink:href="cost-20251231.xsd#cost_HaulHubSeriesBConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_HaulHubSeriesBConvertibleMember" xlink:to="lab_cost_HaulHubSeriesBConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_HonorTechnologyInc.SeriesDMember_label_en-US" xlink:label="lab_cost_HonorTechnologyInc.SeriesDMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Honor Technology Inc., Series D [Member]</link:label>
    <link:label id="lab_cost_HonorTechnologyInc.SeriesDMember_documentation_en-US" xlink:label="lab_cost_HonorTechnologyInc.SeriesDMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Honor Technology Inc., Series D</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_HonorTechnologyInc.SeriesDMember" xlink:href="cost-20251231.xsd#cost_HonorTechnologyInc.SeriesDMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_HonorTechnologyInc.SeriesDMember" xlink:to="lab_cost_HonorTechnologyInc.SeriesDMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_KardiumInc.SeriesD6ConvertibleMember_label_en-US" xlink:label="lab_cost_KardiumInc.SeriesD6ConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Kardium Inc., Series D-6 Convertible [Member]</link:label>
    <link:label id="lab_cost_KardiumInc.SeriesD6ConvertibleMember_documentation_en-US" xlink:label="lab_cost_KardiumInc.SeriesD6ConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Kardium Inc., Series D-6 Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_KardiumInc.SeriesD6ConvertibleMember" xlink:href="cost-20251231.xsd#cost_KardiumInc.SeriesD6ConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_KardiumInc.SeriesD6ConvertibleMember" xlink:to="lab_cost_KardiumInc.SeriesD6ConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_KoBoldMetalsCo.SeriesB1Member_label_en-US" xlink:label="lab_cost_KoBoldMetalsCo.SeriesB1Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">KoBold Metals Co., Series B-1 [Member]</link:label>
    <link:label id="lab_cost_KoBoldMetalsCo.SeriesB1Member_documentation_en-US" xlink:label="lab_cost_KoBoldMetalsCo.SeriesB1Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">KoBold Metals Co., Series B-1</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_KoBoldMetalsCo.SeriesB1Member" xlink:href="cost-20251231.xsd#cost_KoBoldMetalsCo.SeriesB1Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_KoBoldMetalsCo.SeriesB1Member" xlink:to="lab_cost_KoBoldMetalsCo.SeriesB1Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_ManusBioInc.SeriesOne6Member_label_en-US" xlink:label="lab_cost_ManusBioInc.SeriesOne6Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Manus Bio Inc., Series One-6 [Member]</link:label>
    <link:label id="lab_cost_ManusBioInc.SeriesOne6Member_documentation_en-US" xlink:label="lab_cost_ManusBioInc.SeriesOne6Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Manus Bio Inc., Series One-6</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_ManusBioInc.SeriesOne6Member" xlink:href="cost-20251231.xsd#cost_ManusBioInc.SeriesOne6Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ManusBioInc.SeriesOne6Member" xlink:to="lab_cost_ManusBioInc.SeriesOne6Member" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_NationalResilenceSeriesBConvertibleMember_label_en-US" xlink:label="lab_cost_NationalResilenceSeriesBConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">National Resilence, Series B Convertible [Member]</link:label>
    <link:label id="lab_cost_NationalResilenceSeriesBConvertibleMember_documentation_en-US" xlink:label="lab_cost_NationalResilenceSeriesBConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">National Resilence, Series B Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_NationalResilenceSeriesBConvertibleMember" xlink:href="cost-20251231.xsd#cost_NationalResilenceSeriesBConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_NationalResilenceSeriesBConvertibleMember" xlink:to="lab_cost_NationalResilenceSeriesBConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_NationalResilenceSeriesCConvertibleMember_label_en-US" xlink:label="lab_cost_NationalResilenceSeriesCConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">National Resilence, Series C Convertible [Member]</link:label>
    <link:label id="lab_cost_NationalResilenceSeriesCConvertibleMember_documentation_en-US" xlink:label="lab_cost_NationalResilenceSeriesCConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">National Resilence, Series C Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_NationalResilenceSeriesCConvertibleMember" xlink:href="cost-20251231.xsd#cost_NationalResilenceSeriesCConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_NationalResilenceSeriesCConvertibleMember" xlink:to="lab_cost_NationalResilenceSeriesCConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_NuroInc.SeriesCMember_label_en-US" xlink:label="lab_cost_NuroInc.SeriesCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nuro Inc., Series C [Member]</link:label>
    <link:label id="lab_cost_NuroInc.SeriesCMember_documentation_en-US" xlink:label="lab_cost_NuroInc.SeriesCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Nuro Inc., Series C</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_NuroInc.SeriesCMember" xlink:href="cost-20251231.xsd#cost_NuroInc.SeriesCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_NuroInc.SeriesCMember" xlink:to="lab_cost_NuroInc.SeriesCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_SecurityScorecardInc.SeriesEConvertibleMember_label_en-US" xlink:label="lab_cost_SecurityScorecardInc.SeriesEConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SecurityScorecard Inc., Series E Convertible [Member]</link:label>
    <link:label id="lab_cost_SecurityScorecardInc.SeriesEConvertibleMember_documentation_en-US" xlink:label="lab_cost_SecurityScorecardInc.SeriesEConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">SecurityScorecard Inc., Series E Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_SecurityScorecardInc.SeriesEConvertibleMember" xlink:href="cost-20251231.xsd#cost_SecurityScorecardInc.SeriesEConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_SecurityScorecardInc.SeriesEConvertibleMember" xlink:to="lab_cost_SecurityScorecardInc.SeriesEConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CashCashEquivalentsMember_label_en-US" xlink:label="lab_cost_CashCashEquivalentsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash &amp; Cash Equivalents [Member]</link:label>
    <link:label id="lab_cost_CashCashEquivalentsMember_documentation_en-US" xlink:label="lab_cost_CashCashEquivalentsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cash &amp; Cash Equivalents</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CashCashEquivalentsMember" xlink:href="cost-20251231.xsd#cost_CashCashEquivalentsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CashCashEquivalentsMember" xlink:to="lab_cost_CashCashEquivalentsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsMember_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsMember" xlink:to="lab_us-gaap_CashAndCashEquivalentsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_BrukerCorp.ConvertibleSeriesAMember_label_en-US" xlink:label="lab_cost_BrukerCorp.ConvertibleSeriesAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Bruker Corp., Convertible Series A [Member]</link:label>
    <link:label id="lab_cost_BrukerCorp.ConvertibleSeriesAMember_documentation_en-US" xlink:label="lab_cost_BrukerCorp.ConvertibleSeriesAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Bruker Corp., Convertible Series A</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_BrukerCorp.ConvertibleSeriesAMember" xlink:href="cost-20251231.xsd#cost_BrukerCorp.ConvertibleSeriesAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_BrukerCorp.ConvertibleSeriesAMember" xlink:to="lab_cost_BrukerCorp.ConvertibleSeriesAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CellaresCorp.SeriesDConvertibleMember_label_en-US" xlink:label="lab_cost_CellaresCorp.SeriesDConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cellares Corp., Series D Convertible [Member]</link:label>
    <link:label id="lab_cost_CellaresCorp.SeriesDConvertibleMember_documentation_en-US" xlink:label="lab_cost_CellaresCorp.SeriesDConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cellares Corp., Series D Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CellaresCorp.SeriesDConvertibleMember" xlink:href="cost-20251231.xsd#cost_CellaresCorp.SeriesDConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CellaresCorp.SeriesDConvertibleMember" xlink:to="lab_cost_CellaresCorp.SeriesDConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_EpirusInc.SeriesDConvertibleMember_label_en-US" xlink:label="lab_cost_EpirusInc.SeriesDConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Epirus Inc., Series D Convertible [Member]</link:label>
    <link:label id="lab_cost_EpirusInc.SeriesDConvertibleMember_documentation_en-US" xlink:label="lab_cost_EpirusInc.SeriesDConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Epirus Inc., Series D Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_EpirusInc.SeriesDConvertibleMember" xlink:href="cost-20251231.xsd#cost_EpirusInc.SeriesDConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_EpirusInc.SeriesDConvertibleMember" xlink:to="lab_cost_EpirusInc.SeriesDConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_KardiganInc.SeriesBConvertibleMember_label_en-US" xlink:label="lab_cost_KardiganInc.SeriesBConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Kardigan Inc., Series B Convertible [Member]</link:label>
    <link:label id="lab_cost_KardiganInc.SeriesBConvertibleMember_documentation_en-US" xlink:label="lab_cost_KardiganInc.SeriesBConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Kardigan Inc., Series B Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_KardiganInc.SeriesBConvertibleMember" xlink:href="cost-20251231.xsd#cost_KardiganInc.SeriesBConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_KardiganInc.SeriesBConvertibleMember" xlink:to="lab_cost_KardiganInc.SeriesBConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_KardiumInc.SeriesD7ConvertibleMember_label_en-US" xlink:label="lab_cost_KardiumInc.SeriesD7ConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Kardium Inc., Series D-7 Convertible [Member]</link:label>
    <link:label id="lab_cost_KardiumInc.SeriesD7ConvertibleMember_documentation_en-US" xlink:label="lab_cost_KardiumInc.SeriesD7ConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Kardium Inc., Series D-7 Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_KardiumInc.SeriesD7ConvertibleMember" xlink:href="cost-20251231.xsd#cost_KardiumInc.SeriesD7ConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_KardiumInc.SeriesD7ConvertibleMember" xlink:to="lab_cost_KardiumInc.SeriesD7ConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_KardiumInc.SeriesD8ConvertibleMember_label_en-US" xlink:label="lab_cost_KardiumInc.SeriesD8ConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Kardium Inc., Series D-8 Convertible [Member]</link:label>
    <link:label id="lab_cost_KardiumInc.SeriesD8ConvertibleMember_documentation_en-US" xlink:label="lab_cost_KardiumInc.SeriesD8ConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Kardium Inc., Series D-8 Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_KardiumInc.SeriesD8ConvertibleMember" xlink:href="cost-20251231.xsd#cost_KardiumInc.SeriesD8ConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_KardiumInc.SeriesD8ConvertibleMember" xlink:to="lab_cost_KardiumInc.SeriesD8ConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_KoboldMetalsCo.SeriesC1ConvertibleMember_label_en-US" xlink:label="lab_cost_KoboldMetalsCo.SeriesC1ConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Kobold Metals Co., Series C-1 Convertible [Member]</link:label>
    <link:label id="lab_cost_KoboldMetalsCo.SeriesC1ConvertibleMember_documentation_en-US" xlink:label="lab_cost_KoboldMetalsCo.SeriesC1ConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Kobold Metals Co., Series C-1 Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_KoboldMetalsCo.SeriesC1ConvertibleMember" xlink:href="cost-20251231.xsd#cost_KoboldMetalsCo.SeriesC1ConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_KoboldMetalsCo.SeriesC1ConvertibleMember" xlink:to="lab_cost_KoboldMetalsCo.SeriesC1ConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_LightmatterInc.SeriesDConvertibleMember_label_en-US" xlink:label="lab_cost_LightmatterInc.SeriesDConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lightmatter Inc., Series D Convertible [Member]</link:label>
    <link:label id="lab_cost_LightmatterInc.SeriesDConvertibleMember_documentation_en-US" xlink:label="lab_cost_LightmatterInc.SeriesDConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Lightmatter Inc., Series D Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_LightmatterInc.SeriesDConvertibleMember" xlink:href="cost-20251231.xsd#cost_LightmatterInc.SeriesDConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_LightmatterInc.SeriesDConvertibleMember" xlink:to="lab_cost_LightmatterInc.SeriesDConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_MiradorTherapeuticsInc.SeriesBConvertibleMember_label_en-US" xlink:label="lab_cost_MiradorTherapeuticsInc.SeriesBConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Mirador Therapeutics Inc., Series B Convertible [Member]</link:label>
    <link:label id="lab_cost_MiradorTherapeuticsInc.SeriesBConvertibleMember_documentation_en-US" xlink:label="lab_cost_MiradorTherapeuticsInc.SeriesBConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Mirador Therapeutics Inc., Series B Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_MiradorTherapeuticsInc.SeriesBConvertibleMember" xlink:href="cost-20251231.xsd#cost_MiradorTherapeuticsInc.SeriesBConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_MiradorTherapeuticsInc.SeriesBConvertibleMember" xlink:to="lab_cost_MiradorTherapeuticsInc.SeriesBConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_NovantaInc.TangibleEquityUnitsMember_label_en-US" xlink:label="lab_cost_NovantaInc.TangibleEquityUnitsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Novanta Inc., Tangible Equity Units [Member]</link:label>
    <link:label id="lab_cost_NovantaInc.TangibleEquityUnitsMember_documentation_en-US" xlink:label="lab_cost_NovantaInc.TangibleEquityUnitsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Novanta Inc., Tangible Equity Units</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_NovantaInc.TangibleEquityUnitsMember" xlink:href="cost-20251231.xsd#cost_NovantaInc.TangibleEquityUnitsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_NovantaInc.TangibleEquityUnitsMember" xlink:to="lab_cost_NovantaInc.TangibleEquityUnitsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TreelineBiosciencesInc.SeriesA2ConvertibleMember_label_en-US" xlink:label="lab_cost_TreelineBiosciencesInc.SeriesA2ConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Treeline Biosciences Inc., Series A-2 Convertible [Member]</link:label>
    <link:label id="lab_cost_TreelineBiosciencesInc.SeriesA2ConvertibleMember_documentation_en-US" xlink:label="lab_cost_TreelineBiosciencesInc.SeriesA2ConvertibleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Treeline Biosciences Inc., Series A-2 Convertible</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TreelineBiosciencesInc.SeriesA2ConvertibleMember" xlink:href="cost-20251231.xsd#cost_TreelineBiosciencesInc.SeriesA2ConvertibleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TreelineBiosciencesInc.SeriesA2ConvertibleMember" xlink:to="lab_cost_TreelineBiosciencesInc.SeriesA2ConvertibleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_T.RowePriceGovernmentReserveFundMember_label_en-US" xlink:label="lab_cost_T.RowePriceGovernmentReserveFundMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">T. Rowe Price Government Reserve Fund [Member]</link:label>
    <link:label id="lab_cost_T.RowePriceGovernmentReserveFundMember_documentation_en-US" xlink:label="lab_cost_T.RowePriceGovernmentReserveFundMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">T. Rowe Price Government Reserve Fund</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_T.RowePriceGovernmentReserveFundMember" xlink:href="cost-20251231.xsd#cost_T.RowePriceGovernmentReserveFundMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_T.RowePriceGovernmentReserveFundMember" xlink:to="lab_cost_T.RowePriceGovernmentReserveFundMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_TreelineBiosciencesInc.WarrantsMember_label_en-US" xlink:label="lab_cost_TreelineBiosciencesInc.WarrantsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Treeline Biosciences Inc., Warrants [Member]</link:label>
    <link:label id="lab_cost_TreelineBiosciencesInc.WarrantsMember_documentation_en-US" xlink:label="lab_cost_TreelineBiosciencesInc.WarrantsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Treeline Biosciences Inc., Warrants</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_TreelineBiosciencesInc.WarrantsMember" xlink:href="cost-20251231.xsd#cost_TreelineBiosciencesInc.WarrantsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_TreelineBiosciencesInc.WarrantsMember" xlink:to="lab_cost_TreelineBiosciencesInc.WarrantsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_WarrantMember_label_en-US" xlink:label="lab_us-gaap_WarrantMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Warrant [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WarrantMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WarrantMember" xlink:to="lab_us-gaap_WarrantMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CapitalGroupInternationalAllCountryEquityTrustMember_label_en-US" xlink:label="lab_cost_CapitalGroupInternationalAllCountryEquityTrustMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Group International All Country Equity Trust [Member]</link:label>
    <link:label id="lab_cost_CapitalGroupInternationalAllCountryEquityTrustMember_documentation_en-US" xlink:label="lab_cost_CapitalGroupInternationalAllCountryEquityTrustMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Capital Group International All Country Equity Trust</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CapitalGroupInternationalAllCountryEquityTrustMember" xlink:href="cost-20251231.xsd#cost_CapitalGroupInternationalAllCountryEquityTrustMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CapitalGroupInternationalAllCountryEquityTrustMember" xlink:to="lab_cost_CapitalGroupInternationalAllCountryEquityTrustMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_NorthernInstitutionalTreasuryPortfolioPremierSharesMember_label_en-US" xlink:label="lab_cost_NorthernInstitutionalTreasuryPortfolioPremierSharesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Northern Institutional Treasury Portfolio Premier Shares [Member]</link:label>
    <link:label id="lab_cost_NorthernInstitutionalTreasuryPortfolioPremierSharesMember_documentation_en-US" xlink:label="lab_cost_NorthernInstitutionalTreasuryPortfolioPremierSharesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Northern Institutional Treasury Portfolio Premier Shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_NorthernInstitutionalTreasuryPortfolioPremierSharesMember" xlink:href="cost-20251231.xsd#cost_NorthernInstitutionalTreasuryPortfolioPremierSharesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_NorthernInstitutionalTreasuryPortfolioPremierSharesMember" xlink:to="lab_cost_NorthernInstitutionalTreasuryPortfolioPremierSharesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_T.RowePriceCashReservesTrustMember_label_en-US" xlink:label="lab_cost_T.RowePriceCashReservesTrustMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">T. Rowe Price Cash Reserves Trust [Member]</link:label>
    <link:label id="lab_cost_T.RowePriceCashReservesTrustMember_documentation_en-US" xlink:label="lab_cost_T.RowePriceCashReservesTrustMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">T. Rowe Price Cash Reserves Trust</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_T.RowePriceCashReservesTrustMember" xlink:href="cost-20251231.xsd#cost_T.RowePriceCashReservesTrustMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_T.RowePriceCashReservesTrustMember" xlink:to="lab_cost_T.RowePriceCashReservesTrustMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_T.RowePriceIntermediateTermCommonTrustMember_label_en-US" xlink:label="lab_cost_T.RowePriceIntermediateTermCommonTrustMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">T. Rowe Price Intermediate Term Common Trust [Member]</link:label>
    <link:label id="lab_cost_T.RowePriceIntermediateTermCommonTrustMember_documentation_en-US" xlink:label="lab_cost_T.RowePriceIntermediateTermCommonTrustMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">T. Rowe Price Intermediate Term Common Trust</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_T.RowePriceIntermediateTermCommonTrustMember" xlink:href="cost-20251231.xsd#cost_T.RowePriceIntermediateTermCommonTrustMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_T.RowePriceIntermediateTermCommonTrustMember" xlink:to="lab_cost_T.RowePriceIntermediateTermCommonTrustMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_T.RowePriceManagedBondTrustMember_label_en-US" xlink:label="lab_cost_T.RowePriceManagedBondTrustMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">T. Rowe Price Managed Bond Trust [Member]</link:label>
    <link:label id="lab_cost_T.RowePriceManagedBondTrustMember_documentation_en-US" xlink:label="lab_cost_T.RowePriceManagedBondTrustMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">T. Rowe Price Managed Bond Trust</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_T.RowePriceManagedBondTrustMember" xlink:href="cost-20251231.xsd#cost_T.RowePriceManagedBondTrustMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_T.RowePriceManagedBondTrustMember" xlink:to="lab_cost_T.RowePriceManagedBondTrustMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_T.RowePriceShortTermCommonTrustMember_label_en-US" xlink:label="lab_cost_T.RowePriceShortTermCommonTrustMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">T. Rowe Price Short Term Common Trust [Member]</link:label>
    <link:label id="lab_cost_T.RowePriceShortTermCommonTrustMember_documentation_en-US" xlink:label="lab_cost_T.RowePriceShortTermCommonTrustMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">T. Rowe Price Short Term Common Trust</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_T.RowePriceShortTermCommonTrustMember" xlink:href="cost-20251231.xsd#cost_T.RowePriceShortTermCommonTrustMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_T.RowePriceShortTermCommonTrustMember" xlink:to="lab_cost_T.RowePriceShortTermCommonTrustMember" xlink:type="arc" order="1"/>
    <link:label id="lab_cost_CostcoWholesaleCorporationMember_label_en-US" xlink:label="lab_cost_CostcoWholesaleCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Costco Wholesale Corporation [Member]</link:label>
    <link:label id="lab_cost_CostcoWholesaleCorporationMember_documentation_en-US" xlink:label="lab_cost_CostcoWholesaleCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Costco Wholesale Corporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_cost_CostcoWholesaleCorporationMember" xlink:href="cost-20251231.xsd#cost_CostcoWholesaleCorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_CostcoWholesaleCorporationMember" xlink:to="lab_cost_CostcoWholesaleCorporationMember" xlink:type="arc" order="1"/>
  </link:labelLink>
</link:linkbase>
