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    <link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_4C8A5C8159F6B3B06D218DE6D55210C2_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_4C8A5C8159F6B3B06D218DE6D55210C2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_4C8A5C8159F6B3B06D218DE6D55210C2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_4C8A5C8159F6B3B06D218DE6D55210C2" xlink:to="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_4C8A5C8159F6B3B06D218DE6D55210C2" xlink:type="arc" />
    <link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_748EE44F0443BD38615A8DE6D55238B7_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_748EE44F0443BD38615A8DE6D55238B7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears_C43EDF209DBAFFAF61628DE6D5521310" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_DC9CE9B6213474D251F28DE6D55290D2_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_DC9CE9B6213474D251F28DE6D55290D2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_DC9CE9B6213474D251F28DE6D55290D2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_F6941962841C719F9CE38DE6D553549F_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_F6941962841C719F9CE38DE6D553549F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2022</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_F6941962841C719F9CE38DE6D553549F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_FC467864C60CC5BA886B8DE6D553A5C6_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_FC467864C60CC5BA886B8DE6D553A5C6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2023</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_SeniorNotesOnePointSevenFivePercentDueFebruaryTwentyTwentyMember_3F740141C6EFB6C03A8CADAC822AE20A" xlink:to="lab_cost_SeniorNotesOnePointSevenFivePercentDueFebruaryTwentyTwentyMember_3F740141C6EFB6C03A8CADAC822AE20A" xlink:type="arc" />
    <link:label id="lab_cost_SeniorNotesTwoPointOneFivePercentDueMayEighteenTwentyTwentyOneMember_1CC2D03B124390B820A8ADAC822A26E4_terseLabel_en-US" xlink:label="lab_cost_SeniorNotesTwoPointOneFivePercentDueMayEighteenTwentyTwentyOneMember_1CC2D03B124390B820A8ADAC822A26E4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2.15% Senior Notes due May 2021</link:label>
    <link:label id="lab_cost_SeniorNotesTwoPointOneFivePercentDueMayEighteenTwentyTwentyOneMember_1CC2D03B124390B820A8ADAC822A26E4_label_en-US" xlink:label="lab_cost_SeniorNotesTwoPointOneFivePercentDueMayEighteenTwentyTwentyOneMember_1CC2D03B124390B820A8ADAC822A26E4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SeniorNotesTwoPointOneFivePercentDueMayEighteenTwentyTwentyOne [Member]</link:label>
    <link:label id="lab_cost_SeniorNotesTwoPointOneFivePercentDueMayEighteenTwentyTwentyOneMember_1CC2D03B124390B820A8ADAC822A26E4_documentation_en-US" xlink:label="lab_cost_SeniorNotesTwoPointOneFivePercentDueMayEighteenTwentyTwentyOneMember_1CC2D03B124390B820A8ADAC822A26E4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">SeniorNotesTwoPointOneFivePercentDueMayEighteenTwentyTwentyOne [Member]</link:label>
    <link:loc xlink:href="cost-20180902.xsd#cost_SeniorNotesTwoPointOneFivePercentDueMayEighteenTwentyTwentyOneMember" xlink:label="loc_cost_SeniorNotesTwoPointOneFivePercentDueMayEighteenTwentyTwentyOneMember_1CC2D03B124390B820A8ADAC822A26E4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_SeniorNotesTwoPointOneFivePercentDueMayEighteenTwentyTwentyOneMember_1CC2D03B124390B820A8ADAC822A26E4" xlink:to="lab_cost_SeniorNotesTwoPointOneFivePercentDueMayEighteenTwentyTwentyOneMember_1CC2D03B124390B820A8ADAC822A26E4" xlink:type="arc" />
    <link:label id="lab_cost_SeniorNotesTwoPointTwoFivePercentDueFebruaryTwentyTwentyTwoMember_6A7F84FB2899068AE380ADAC822AED55_terseLabel_en-US" xlink:label="lab_cost_SeniorNotesTwoPointTwoFivePercentDueFebruaryTwentyTwentyTwoMember_6A7F84FB2899068AE380ADAC822AED55" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2.25% Senior Notes due February 2022</link:label>
    <link:label id="lab_cost_SeniorNotesTwoPointTwoFivePercentDueFebruaryTwentyTwentyTwoMember_6A7F84FB2899068AE380ADAC822AED55_label_en-US" xlink:label="lab_cost_SeniorNotesTwoPointTwoFivePercentDueFebruaryTwentyTwentyTwoMember_6A7F84FB2899068AE380ADAC822AED55" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Senior Notes Two Point Two Five Percent Due February Twenty Twenty Two [Member]</link:label>
    <link:label id="lab_cost_SeniorNotesTwoPointTwoFivePercentDueFebruaryTwentyTwentyTwoMember_6A7F84FB2899068AE380ADAC822AED55_documentation_en-US" xlink:label="lab_cost_SeniorNotesTwoPointTwoFivePercentDueFebruaryTwentyTwentyTwoMember_6A7F84FB2899068AE380ADAC822AED55" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Senior Notes Two Point Two Five Percent Due February Twenty Twenty Two [Member]</link:label>
    <link:loc xlink:href="cost-20180902.xsd#cost_SeniorNotesTwoPointTwoFivePercentDueFebruaryTwentyTwentyTwoMember" xlink:label="loc_cost_SeniorNotesTwoPointTwoFivePercentDueFebruaryTwentyTwentyTwoMember_6A7F84FB2899068AE380ADAC822AED55" xlink:type="locator" />
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    <link:label id="lab_cost_SeniorNotesTwoPointThreeZeroPercentDueMayEighteenTwentyTwentyTwoMember_B5774BB121340F1678C3ADAC822A8313_terseLabel_en-US" xlink:label="lab_cost_SeniorNotesTwoPointThreeZeroPercentDueMayEighteenTwentyTwentyTwoMember_B5774BB121340F1678C3ADAC822A8313" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2.30% Senior Notes due May 2022</link:label>
    <link:label id="lab_cost_SeniorNotesTwoPointThreeZeroPercentDueMayEighteenTwentyTwentyTwoMember_B5774BB121340F1678C3ADAC822A8313_label_en-US" xlink:label="lab_cost_SeniorNotesTwoPointThreeZeroPercentDueMayEighteenTwentyTwentyTwoMember_B5774BB121340F1678C3ADAC822A8313" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SeniorNotesTwoPointThreeZeroPercentDueMayEighteenTwentyTwentyTwo [Member]</link:label>
    <link:label id="lab_cost_SeniorNotesTwoPointThreeZeroPercentDueMayEighteenTwentyTwentyTwoMember_B5774BB121340F1678C3ADAC822A8313_documentation_en-US" xlink:label="lab_cost_SeniorNotesTwoPointThreeZeroPercentDueMayEighteenTwentyTwentyTwoMember_B5774BB121340F1678C3ADAC822A8313" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">SeniorNotesTwoPointThreeZeroPercentDueMayEighteenTwentyTwentyTwo [Member]</link:label>
    <link:loc xlink:href="cost-20180902.xsd#cost_SeniorNotesTwoPointThreeZeroPercentDueMayEighteenTwentyTwentyTwoMember" xlink:label="loc_cost_SeniorNotesTwoPointThreeZeroPercentDueMayEighteenTwentyTwentyTwoMember_B5774BB121340F1678C3ADAC822A8313" xlink:type="locator" />
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    <link:label id="lab_cost_SeniorNotesTwoPointSevenFivePercentDueMayEighteenTwentyTwentyFourMemberMember_F7BD2339467D112DDAD0ADAC822A267B_terseLabel_en-US" xlink:label="lab_cost_SeniorNotesTwoPointSevenFivePercentDueMayEighteenTwentyTwentyFourMemberMember_F7BD2339467D112DDAD0ADAC822A267B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2.75% Senior Notes due May 2024</link:label>
    <link:label id="lab_cost_SeniorNotesTwoPointSevenFivePercentDueMayEighteenTwentyTwentyFourMemberMember_F7BD2339467D112DDAD0ADAC822A267B_label_en-US" xlink:label="lab_cost_SeniorNotesTwoPointSevenFivePercentDueMayEighteenTwentyTwentyFourMemberMember_F7BD2339467D112DDAD0ADAC822A267B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SeniorNotesTwoPointSevenFivePercentDueMayEighteenTwentyTwentyFour [Member] [Member]</link:label>
    <link:label id="lab_cost_SeniorNotesTwoPointSevenFivePercentDueMayEighteenTwentyTwentyFourMemberMember_F7BD2339467D112DDAD0ADAC822A267B_documentation_en-US" xlink:label="lab_cost_SeniorNotesTwoPointSevenFivePercentDueMayEighteenTwentyTwentyFourMemberMember_F7BD2339467D112DDAD0ADAC822A267B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">SeniorNotesTwoPointSevenFivePercentDueMayEighteenTwentyTwentyFour [Member] [Member]</link:label>
    <link:loc xlink:href="cost-20180902.xsd#cost_SeniorNotesTwoPointSevenFivePercentDueMayEighteenTwentyTwentyFourMemberMember" xlink:label="loc_cost_SeniorNotesTwoPointSevenFivePercentDueMayEighteenTwentyTwentyFourMemberMember_F7BD2339467D112DDAD0ADAC822A267B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_SeniorNotesTwoPointSevenFivePercentDueMayEighteenTwentyTwentyFourMemberMember_F7BD2339467D112DDAD0ADAC822A267B" xlink:to="lab_cost_SeniorNotesTwoPointSevenFivePercentDueMayEighteenTwentyTwentyFourMemberMember_F7BD2339467D112DDAD0ADAC822A267B" xlink:type="arc" />
    <link:label id="lab_cost_SeniorNotesThreePercentDueMayEighteenTwentyTwentySevenMemberMember_4CDCC709D41645625750ADAC822AB5C8_terseLabel_en-US" xlink:label="lab_cost_SeniorNotesThreePercentDueMayEighteenTwentyTwentySevenMemberMember_4CDCC709D41645625750ADAC822AB5C8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3.00% Senior Notes due May 2027</link:label>
    <link:label id="lab_cost_SeniorNotesThreePercentDueMayEighteenTwentyTwentySevenMemberMember_4CDCC709D41645625750ADAC822AB5C8_label_en-US" xlink:label="lab_cost_SeniorNotesThreePercentDueMayEighteenTwentyTwentySevenMemberMember_4CDCC709D41645625750ADAC822AB5C8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SeniorNotesThreePercentDueMayEighteenTwentyTwentySeven[Member] [Member]</link:label>
    <link:label id="lab_cost_SeniorNotesThreePercentDueMayEighteenTwentyTwentySevenMemberMember_4CDCC709D41645625750ADAC822AB5C8_documentation_en-US" xlink:label="lab_cost_SeniorNotesThreePercentDueMayEighteenTwentyTwentySevenMemberMember_4CDCC709D41645625750ADAC822AB5C8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">SeniorNotesThreePercentDueMayEighteenTwentyTwentySeven[Member]</link:label>
    <link:loc xlink:href="cost-20180902.xsd#cost_SeniorNotesThreePercentDueMayEighteenTwentyTwentySevenMemberMember" xlink:label="loc_cost_SeniorNotesThreePercentDueMayEighteenTwentyTwentySevenMemberMember_4CDCC709D41645625750ADAC822AB5C8" xlink:type="locator" />
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    <link:label id="lab_cost_OtherLongTermDebtMember_78313EE5B5DD4D1DD970ADAC822AAFEF_terseLabel_en-US" xlink:label="lab_cost_OtherLongTermDebtMember_78313EE5B5DD4D1DD970ADAC822AAFEF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Long Term Debt</link:label>
    <link:label id="lab_cost_OtherLongTermDebtMember_78313EE5B5DD4D1DD970ADAC822AAFEF_label_en-US" xlink:label="lab_cost_OtherLongTermDebtMember_78313EE5B5DD4D1DD970ADAC822AAFEF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Long Term Debt [Member]</link:label>
    <link:label id="lab_cost_OtherLongTermDebtMember_78313EE5B5DD4D1DD970ADAC822AAFEF_documentation_en-US" xlink:label="lab_cost_OtherLongTermDebtMember_78313EE5B5DD4D1DD970ADAC822AAFEF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other Long Term Debt [Member]</link:label>
    <link:loc xlink:href="cost-20180902.xsd#cost_OtherLongTermDebtMember" xlink:label="loc_cost_OtherLongTermDebtMember_78313EE5B5DD4D1DD970ADAC822AAFEF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_OtherLongTermDebtMember_78313EE5B5DD4D1DD970ADAC822AAFEF" xlink:to="lab_cost_OtherLongTermDebtMember_78313EE5B5DD4D1DD970ADAC822AAFEF" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueInputsLevel3Member_B5D2B5E5969A9A6E700EADAC822A9F78_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel3Member_B5D2B5E5969A9A6E700EADAC822A9F78" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value, Inputs, Level 3 [Member]</link:label>
    <link:label id="lab_us-gaap_FairValueInputsLevel3Member_B5D2B5E5969A9A6E700EADAC822A9F78_label_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel3Member_B5D2B5E5969A9A6E700EADAC822A9F78" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Inputs, Level 3 [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_B5D2B5E5969A9A6E700EADAC822A9F78" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueInputsLevel3Member_B5D2B5E5969A9A6E700EADAC822A9F78" xlink:to="lab_us-gaap_FairValueInputsLevel3Member_B5D2B5E5969A9A6E700EADAC822A9F78" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentLineItems_E0A5E83C719CA87CD184ADAC822AC678_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_E0A5E83C719CA87CD184ADAC822AC678" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument [Line Items]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentLineItems_E0A5E83C719CA87CD184ADAC822AC678_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_E0A5E83C719CA87CD184ADAC822AC678" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_E0A5E83C719CA87CD184ADAC822AC678" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentLineItems_E0A5E83C719CA87CD184ADAC822AC678" xlink:to="lab_us-gaap_DebtInstrumentLineItems_E0A5E83C719CA87CD184ADAC822AC678" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_E2E8F8F76B7CFD50A808ADAC822AA260_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_E2E8F8F76B7CFD50A808ADAC822AA260" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt instrument, interest rate, stated percentage</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_E2E8F8F76B7CFD50A808ADAC822AA260_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_E2E8F8F76B7CFD50A808ADAC822AA260" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Interest Rate, Stated Percentage</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_E2E8F8F76B7CFD50A808ADAC822AA260" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentMaturityDate_366A66753271506C8050ADAC822AB8BE_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentMaturityDate_366A66753271506C8050ADAC822AB8BE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Maturity Date</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="loc_us-gaap_DebtInstrumentMaturityDate_366A66753271506C8050ADAC822AB8BE" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentFrequencyOfPeriodicPayment_D584C3E72F89BE822EF8ADAC822AE12F_verboseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFrequencyOfPeriodicPayment_D584C3E72F89BE822EF8ADAC822AE12F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Frequency of Periodic Payment</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentFrequencyOfPeriodicPayment_D584C3E72F89BE822EF8ADAC822AE12F_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFrequencyOfPeriodicPayment_D584C3E72F89BE822EF8ADAC822AE12F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Frequency of Periodic Payment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentFrequencyOfPeriodicPayment" xlink:label="loc_us-gaap_DebtInstrumentFrequencyOfPeriodicPayment_D584C3E72F89BE822EF8ADAC822AE12F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LongTermDebt_5A734DC8712239495C9CADAC822A9E3E_totalLabel_en-US" xlink:label="lab_us-gaap_LongTermDebt_5A734DC8712239495C9CADAC822A9E3E" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total long-term debt, carrying value</link:label>
    <link:label id="lab_us-gaap_LongTermDebt_5A734DC8712239495C9CADAC822A9E3E_label_en-US" xlink:label="lab_us-gaap_LongTermDebt_5A734DC8712239495C9CADAC822A9E3E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_5A734DC8712239495C9CADAC822A9E3E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LongTermDebtCurrent_5FFC1F403586BB55FA53ADAC822ABE13_verboseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtCurrent_5FFC1F403586BB55FA53ADAC822ABE13" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Less current portion, carrying value</link:label>
    <link:label id="lab_us-gaap_LongTermDebtCurrent_5FFC1F403586BB55FA53ADAC822ABE13_label_en-US" xlink:label="lab_us-gaap_LongTermDebtCurrent_5FFC1F403586BB55FA53ADAC822ABE13" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Current Maturities</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtNoncurrent_7D719A61C399CBAA38DCADAC822A77D7" xlink:to="lab_us-gaap_LongTermDebtNoncurrent_7D719A61C399CBAA38DCADAC822A77D7" xlink:type="arc" />
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    <link:label id="lab_us-gaap_LongTermDebtFairValue_7A8E3B24079B9B21DCCBADAC822AE17C_label_en-US" xlink:label="lab_us-gaap_LongTermDebtFairValue_7A8E3B24079B9B21DCCBADAC822AE17C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Fair Value</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_4ADDE63F920A80F0F8E0ADAC822AF37A" xlink:type="locator" />
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_RedemptionPriceCertainEvents_04E05668D800C94B327FADAC822A31D3" xlink:to="lab_cost_RedemptionPriceCertainEvents_04E05668D800C94B327FADAC822A31D3" xlink:type="arc" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_9B905BE9EF1513AC34B5AF655F6332D8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_9B905BE9EF1513AC34B5AF655F6332D8" xlink:to="lab_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_9B905BE9EF1513AC34B5AF655F6332D8" xlink:type="arc" />
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_C9039067C8DB93949FF4AF655F631521" xlink:to="lab_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_C9039067C8DB93949FF4AF655F631521" xlink:type="arc" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_8896BFC1037161C8B92DAF655F64C9D2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_8896BFC1037161C8B92DAF655F64C9D2" xlink:to="lab_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_8896BFC1037161C8B92DAF655F64C9D2" xlink:type="arc" />
    <link:label id="lab_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_3CCC986D8B28E2A78417AF655F64B34C_terseLabel_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_3CCC986D8B28E2A78417AF655F64B34C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Due after five years</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_DD5C0EE4B85AD7E7F51BAF655F65CCA7" xlink:to="lab_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_DD5C0EE4B85AD7E7F51BAF655F65CCA7" xlink:type="arc" />
    <link:label id="lab_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_A25A573FA2B84D7DB84FAF655F650334_terseLabel_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_A25A573FA2B84D7DB84FAF655F650334" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Due in one year or less</link:label>
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    <link:label id="lab_cost_PortionOfEachShareIssuedCountedTowardsLimitOfSharesAvailable_8C068D17E282F5079909ADBB70239255_terseLabel_en-US" xlink:label="lab_cost_PortionOfEachShareIssuedCountedTowardsLimitOfSharesAvailable_8C068D17E282F5079909ADBB70239255" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Portion of each share issued counted towards limit of shares available</link:label>
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    <link:label id="lab_cost_PortionOfEachShareIssuedCountedTowardsLimitOfSharesAvailable_8C068D17E282F5079909ADBB70239255_documentation_en-US" xlink:label="lab_cost_PortionOfEachShareIssuedCountedTowardsLimitOfSharesAvailable_8C068D17E282F5079909ADBB70239255" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The conversion rate at which each share of common stock bonus or unit issued under the plan is calculated in order to reduce the total number of authorized shares available under the plan.</link:label>
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    <link:label id="lab_cost_MandatoryProportionalAdjustmentSharesAvailableToGrant_44C081698D32039E5E41ADBB70296CB1_terseLabel_en-US" xlink:label="lab_cost_MandatoryProportionalAdjustmentSharesAvailableToGrant_44C081698D32039E5E41ADBB70296CB1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Additional shares available to be granted</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_1CB279B275FABD3C0D34ADBB70291DFA" xlink:type="locator" />
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    <link:label id="lab_cost_SpecialCashDividendSharesAdjustmentRatio_241C7C353655C94BD477ADBB7029BF40_terseLabel_en-US" xlink:label="lab_cost_SpecialCashDividendSharesAdjustmentRatio_241C7C353655C94BD477ADBB7029BF40" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Special Cash Dividend Shares Adjustment Ratio</link:label>
    <link:label id="lab_cost_SpecialCashDividendSharesAdjustmentRatio_241C7C353655C94BD477ADBB7029BF40_label_en-US" xlink:label="lab_cost_SpecialCashDividendSharesAdjustmentRatio_241C7C353655C94BD477ADBB7029BF40" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Special Cash Dividend Shares Adjustment Ratio</link:label>
    <link:label id="lab_cost_SpecialCashDividendSharesAdjustmentRatio_241C7C353655C94BD477ADBB7029BF40_documentation_en-US" xlink:label="lab_cost_SpecialCashDividendSharesAdjustmentRatio_241C7C353655C94BD477ADBB7029BF40" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the outstanding shares adjustment ratio of the NASDAQ closing price the day before to the NASDAQ opening price, the ex-dividend date.</link:label>
    <link:loc xlink:href="cost-20180902.xsd#cost_SpecialCashDividendSharesAdjustmentRatio" xlink:label="loc_cost_SpecialCashDividendSharesAdjustmentRatio_241C7C353655C94BD477ADBB7029BF40" xlink:type="locator" />
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    <link:label id="lab_cost_MandatoryProportionalAdjustmentToRestrictedStockUnits_5ED00F1EBF46A8CC47CAADBB7029DA8A_terseLabel_en-US" xlink:label="lab_cost_MandatoryProportionalAdjustmentToRestrictedStockUnits_5ED00F1EBF46A8CC47CAADBB7029DA8A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Mandatory Proportional Adjustment To Restricted Stock Units</link:label>
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    <link:label id="lab_cost_MandatoryProportionalAdjustmentToRestrictedStockUnits_5ED00F1EBF46A8CC47CAADBB7029DA8A_documentation_en-US" xlink:label="lab_cost_MandatoryProportionalAdjustmentToRestrictedStockUnits_5ED00F1EBF46A8CC47CAADBB7029DA8A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Mandatory adjustment to restricted stock units outstanding as of the effect date of a special cash dividend.</link:label>
    <link:loc xlink:href="cost-20180902.xsd#cost_MandatoryProportionalAdjustmentToRestrictedStockUnits" xlink:label="loc_cost_MandatoryProportionalAdjustmentToRestrictedStockUnits_5ED00F1EBF46A8CC47CAADBB7029DA8A" xlink:type="locator" />
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    <link:label id="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentNumberOfYearsOfService_721F8385ABDD3F6E7C27ADBB702ADCE4_terseLabel_en-US" xlink:label="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentNumberOfYearsOfService_721F8385ABDD3F6E7C27ADBB702ADCE4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based compensation arrangement by share-based payment number of years of service</link:label>
    <link:label id="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentNumberOfYearsOfService_721F8385ABDD3F6E7C27ADBB702ADCE4_label_en-US" xlink:label="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentNumberOfYearsOfService_721F8385ABDD3F6E7C27ADBB702ADCE4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share Based Compensation Arrangement By Share Based Payment Number Of Years Of Service</link:label>
    <link:label id="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentNumberOfYearsOfService_721F8385ABDD3F6E7C27ADBB702ADCE4_documentation_en-US" xlink:label="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentNumberOfYearsOfService_721F8385ABDD3F6E7C27ADBB702ADCE4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The number of years of service completed by an employee with the Company at which accelerated vesting occurs.</link:label>
    <link:loc xlink:href="cost-20180902.xsd#cost_ShareBasedCompensationArrangementByShareBasedPaymentNumberOfYearsOfService" xlink:label="loc_cost_ShareBasedCompensationArrangementByShareBasedPaymentNumberOfYearsOfService_721F8385ABDD3F6E7C27ADBB702ADCE4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ShareBasedCompensationArrangementByShareBasedPaymentNumberOfYearsOfService_721F8385ABDD3F6E7C27ADBB702ADCE4" xlink:to="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentNumberOfYearsOfService_721F8385ABDD3F6E7C27ADBB702ADCE4" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_2CC9C1ACE5190F9A78B3ADBB702AFF0E_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_2CC9C1ACE5190F9A78B3ADBB702AFF0E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of shares available to be granted as RSUs</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_2CC9C1ACE5190F9A78B3ADBB702AFF0E_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_2CC9C1ACE5190F9A78B3ADBB702AFF0E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_2CC9C1ACE5190F9A78B3ADBB702AFF0E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_2CC9C1ACE5190F9A78B3ADBB702AFF0E" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_2CC9C1ACE5190F9A78B3ADBB702AFF0E" xlink:type="arc" />
    <link:label id="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTimeBased_C6518F0E57145689A277ADBB702ADBB6_terseLabel_en-US" xlink:label="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTimeBased_C6518F0E57145689A277ADBB702ADBB6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Time-based RSUs awards outstanding</link:label>
    <link:label id="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTimeBased_C6518F0E57145689A277ADBB702ADBB6_label_en-US" xlink:label="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTimeBased_C6518F0E57145689A277ADBB702ADBB6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Time Based</link:label>
    <link:label id="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTimeBased_C6518F0E57145689A277ADBB702ADBB6_documentation_en-US" xlink:label="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTimeBased_C6518F0E57145689A277ADBB702ADBB6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The number of time-based compensation restricted stock units outstanding at the end of the period.</link:label>
    <link:loc xlink:href="cost-20180902.xsd#cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTimeBased" xlink:label="loc_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTimeBased_C6518F0E57145689A277ADBB702ADBB6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTimeBased_C6518F0E57145689A277ADBB702ADBB6" xlink:to="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTimeBased_C6518F0E57145689A277ADBB702ADBB6" xlink:type="arc" />
    <link:label id="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingPerformanceBased_F1D0E27880CCEE07A3DFADBB702AC041_terseLabel_en-US" xlink:label="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingPerformanceBased_F1D0E27880CCEE07A3DFADBB702AC041" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Performance-based RSUs awards outstanding</link:label>
    <link:label id="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingPerformanceBased_F1D0E27880CCEE07A3DFADBB702AC041_label_en-US" xlink:label="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingPerformanceBased_F1D0E27880CCEE07A3DFADBB702AC041" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Performance Based</link:label>
    <link:label id="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingPerformanceBased_F1D0E27880CCEE07A3DFADBB702AC041_documentation_en-US" xlink:label="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingPerformanceBased_F1D0E27880CCEE07A3DFADBB702AC041" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of performance-based compensation awards outstanding at the end of the period.</link:label>
    <link:loc xlink:href="cost-20180902.xsd#cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingPerformanceBased" xlink:label="loc_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingPerformanceBased_F1D0E27880CCEE07A3DFADBB702AC041" xlink:type="locator" />
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    <link:label id="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingPerformanceBasedToBeGranted_0967FA2A2A5D7FFFF2C7ADBB702B266C_terseLabel_en-US" xlink:label="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingPerformanceBasedToBeGranted_0967FA2A2A5D7FFFF2C7ADBB702B266C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Outstanding performance-based RSUs awards granted, subject to performance</link:label>
    <link:label id="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingPerformanceBasedToBeGranted_0967FA2A2A5D7FFFF2C7ADBB702B266C_label_en-US" xlink:label="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingPerformanceBasedToBeGranted_0967FA2A2A5D7FFFF2C7ADBB702B266C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Performance Based To Be Granted</link:label>
    <link:label id="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingPerformanceBasedToBeGranted_0967FA2A2A5D7FFFF2C7ADBB702B266C_documentation_en-US" xlink:label="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingPerformanceBasedToBeGranted_0967FA2A2A5D7FFFF2C7ADBB702B266C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of performance-based compensation awards granted to executive officers upon achievement of the specified performance targets as approved by the Company's Board of Directors.</link:label>
    <link:loc xlink:href="cost-20180902.xsd#cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingPerformanceBasedToBeGranted" xlink:label="loc_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingPerformanceBasedToBeGranted_0967FA2A2A5D7FFFF2C7ADBB702B266C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingPerformanceBasedToBeGranted_0967FA2A2A5D7FFFF2C7ADBB702B266C" xlink:to="lab_cost_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingPerformanceBasedToBeGranted_0967FA2A2A5D7FFFF2C7ADBB702B266C" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_90DE35F5BB6D7F462944ADBB702BF561_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_90DE35F5BB6D7F462944ADBB702BF561" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Weighted-average grant date fair value</link:label>
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