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    <link:label id="lab_ino_PrepaidExpensesAndOtherCurrentAssetsFromAffiliatedEntity_97C809A3000281B72B213B2D0C4B4637_documentation_en-US" xlink:label="lab_ino_PrepaidExpensesAndOtherCurrentAssetsFromAffiliatedEntity_97C809A3000281B72B213B2D0C4B4637" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The total amounts paid to related parties in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event.</link:label>
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    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsRemainderOfFiscalYear_B3DD8AB09DB0FA3F8B98D9B23D816CD8_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsRemainderOfFiscalYear_B3DD8AB09DB0FA3F8B98D9B23D816CD8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Remainder of 2018</link:label>
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    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_AE1885C693385AD66E68D9B23D81420E_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_AE1885C693385AD66E68D9B23D81420E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_AE1885C693385AD66E68D9B23D81420E_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_AE1885C693385AD66E68D9B23D81420E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due in Two Years</link:label>
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    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_AD587FFF13BCA57F5A19D9B23D81D5F0_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_AD587FFF13BCA57F5A19D9B23D81D5F0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_A29E094D25918015424AD9B23D81F33E" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_ED3070F3DA70446474CCD58FE8F09A51" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LicensesRevenue" xlink:label="loc_us-gaap_LicensesRevenue_CD57C16225B9B6B122152161BD77BC48" xlink:type="locator" />
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    <link:label id="lab_ino_LicenseFeeAndMilestoneRevenueFromAffiliatedEntity_896CBC50B5551BC3351D2161BD774BE6_terseLabel_en-US" xlink:label="lab_ino_LicenseFeeAndMilestoneRevenueFromAffiliatedEntity_896CBC50B5551BC3351D2161BD774BE6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenue under collaborative research and development arrangements with affiliated entities</link:label>
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    <link:label id="lab_us-gaap_RevenueFromGrants_D2789904C1E82922C59C2161BD778FEE_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueFromGrants_D2789904C1E82922C59C2161BD778FEE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Grants and miscellaneous revenue</link:label>
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    <link:label id="lab_us-gaap_OperatingExpensesAbstract_A492FD6509E5B559DD9F2161BD7725F4_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingExpensesAbstract_A492FD6509E5B559DD9F2161BD7725F4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Expenses [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="loc_us-gaap_OperatingExpensesAbstract_A492FD6509E5B559DD9F2161BD7725F4" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_4ACF26F12A5DC8AA808B2161BD77FBDA" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_8B4B1FF2E7F0104A57932161BD778669" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GeneralAndAdministrativeExpense_8B4B1FF2E7F0104A57932161BD778669" xlink:to="lab_us-gaap_GeneralAndAdministrativeExpense_8B4B1FF2E7F0104A57932161BD778669" xlink:type="arc" />
    <link:label id="lab_ino_GoodwillAndIntangibleAssetsTextualAbstract_CD14A8BC74C9E8A60B78D3FB8CDCB21E_verboseLabel_en-US" xlink:label="lab_ino_GoodwillAndIntangibleAssetsTextualAbstract_CD14A8BC74C9E8A60B78D3FB8CDCB21E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Goodwill and Intangible Assets (Textual) [Abstract]</link:label>
    <link:label id="lab_ino_GoodwillAndIntangibleAssetsTextualAbstract_CD14A8BC74C9E8A60B78D3FB8CDCB21E_label_en-US" xlink:label="lab_ino_GoodwillAndIntangibleAssetsTextualAbstract_CD14A8BC74C9E8A60B78D3FB8CDCB21E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill and Intangible Assets (Textual) [Abstract]</link:label>
    <link:label id="lab_ino_GoodwillAndIntangibleAssetsTextualAbstract_CD14A8BC74C9E8A60B78D3FB8CDCB21E_documentation_en-US" xlink:label="lab_ino_GoodwillAndIntangibleAssetsTextualAbstract_CD14A8BC74C9E8A60B78D3FB8CDCB21E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Goodwill and intangible assets.</link:label>
    <link:loc xlink:href="ino-20180331.xsd#ino_GoodwillAndIntangibleAssetsTextualAbstract" xlink:label="loc_ino_GoodwillAndIntangibleAssetsTextualAbstract_CD14A8BC74C9E8A60B78D3FB8CDCB21E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ino_GoodwillAndIntangibleAssetsTextualAbstract_CD14A8BC74C9E8A60B78D3FB8CDCB21E" xlink:to="lab_ino_GoodwillAndIntangibleAssetsTextualAbstract_CD14A8BC74C9E8A60B78D3FB8CDCB21E" xlink:type="arc" />
    <link:label id="lab_us-gaap_AmortizationOfIntangibleAssets_F49E65B42734B71E3250D3FB8CDCB93C_terseLabel_en-US" xlink:label="lab_us-gaap_AmortizationOfIntangibleAssets_F49E65B42734B71E3250D3FB8CDCB93C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Aggregate amortization expense on intangible assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_F49E65B42734B71E3250D3FB8CDCB93C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AmortizationOfIntangibleAssets_F49E65B42734B71E3250D3FB8CDCB93C" xlink:to="lab_us-gaap_AmortizationOfIntangibleAssets_F49E65B42734B71E3250D3FB8CDCB93C" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_1370C3A67E49FDFEBC27D3FB8CDCCF19_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_1370C3A67E49FDFEBC27D3FB8CDCCF19" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Estimated aggregate amortization expense for remainder of 2018</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_1370C3A67E49FDFEBC27D3FB8CDCCF19_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_1370C3A67E49FDFEBC27D3FB8CDCCF19" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_1370C3A67E49FDFEBC27D3FB8CDCCF19" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_1370C3A67E49FDFEBC27D3FB8CDCCF19" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_1370C3A67E49FDFEBC27D3FB8CDCCF19" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_43C736C0C10134DA4B32D3FB8CDCD810_verboseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_43C736C0C10134DA4B32D3FB8CDCD810" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Estimated aggregate amortization expense for 2019</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_43C736C0C10134DA4B32D3FB8CDCD810_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_43C736C0C10134DA4B32D3FB8CDCD810" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Amortization Expense, Year Two</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_43C736C0C10134DA4B32D3FB8CDCD810" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_43C736C0C10134DA4B32D3FB8CDCD810" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_43C736C0C10134DA4B32D3FB8CDCD810" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_203E603CC38DF27BD3E5D3FB8CDCF95A_verboseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_203E603CC38DF27BD3E5D3FB8CDCF95A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Estimated aggregate amortization expense for 2020</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_203E603CC38DF27BD3E5D3FB8CDCF95A_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_203E603CC38DF27BD3E5D3FB8CDCF95A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Amortization Expense, Year Three</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_203E603CC38DF27BD3E5D3FB8CDCF95A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_203E603CC38DF27BD3E5D3FB8CDCF95A" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_203E603CC38DF27BD3E5D3FB8CDCF95A" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_4CC8EA686A4E3D069171D3FB8CDCEC99_verboseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_4CC8EA686A4E3D069171D3FB8CDCEC99" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Estimated aggregate amortization expense for 2021</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_4CC8EA686A4E3D069171D3FB8CDCEC99_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_4CC8EA686A4E3D069171D3FB8CDCEC99" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Amortization Expense, Year Four</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_4CC8EA686A4E3D069171D3FB8CDCEC99" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_4CC8EA686A4E3D069171D3FB8CDCEC99" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_4CC8EA686A4E3D069171D3FB8CDCEC99" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_4099DC0753896098C50FD3FB8CDC1E45_verboseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_4099DC0753896098C50FD3FB8CDC1E45" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Estimated aggregate amortization expense for 2022</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_4099DC0753896098C50FD3FB8CDC1E45_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_4099DC0753896098C50FD3FB8CDC1E45" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Amortization Expense, Year Five</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_4099DC0753896098C50FD3FB8CDC1E45" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_4099DC0753896098C50FD3FB8CDC1E45" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_4099DC0753896098C50FD3FB8CDC1E45" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_5E5C64118717EC1CA0D2D3FB8CDC39A2_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_5E5C64118717EC1CA0D2D3FB8CDC39A2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Estimated aggregate amortization expense for 2023 and the years after</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_5E5C64118717EC1CA0D2D3FB8CDC39A2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_5E5C64118717EC1CA0D2D3FB8CDC39A2" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_5E5C64118717EC1CA0D2D3FB8CDC39A2" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock_63EC4220CDFE675334D34FCC3EEDC174_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock_63EC4220CDFE675334D34FCC3EEDC174" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of intangible assets by major asset class</link:label>
    <link:label id="lab_us-gaap_ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock_63EC4220CDFE675334D34FCC3EEDC174_label_en-US" xlink:label="lab_us-gaap_ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock_63EC4220CDFE675334D34FCC3EEDC174" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Intangible Assets and Goodwill [Table Text Block]</link:label>
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    <link:label id="lab_us-gaap_ScheduleOfStockByClassTable_5A8FEF294E9F730A093A217BB2C010E9_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfStockByClassTable_5A8FEF294E9F730A093A217BB2C010E9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Stock by Class [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfStockByClassTable_5A8FEF294E9F730A093A217BB2C010E9_label_en-US" xlink:label="lab_us-gaap_ScheduleOfStockByClassTable_5A8FEF294E9F730A093A217BB2C010E9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Stock by Class [Table]</link:label>
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