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    <filerInfo>

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        <issuerCredentials>
          <cik>0000810902</cik>
          <ccc>XXXXXXXX</ccc>
        </issuerCredentials>
      </filer>


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        <classId>C000001636</classId>
        <classId>C000077819</classId>
        <classId>C000165211</classId>
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    </filerInfo>
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      <regName>BARON INVESTMENT FUNDS TRUST (f/k/a BARON ASSET FUND)</regName>
      <regFileNumber>811-05032</regFileNumber>
      <regCik>0000810902</regCik>
      <regLei>549300QG0RSSKFZ1ZK02</regLei>
      <regStreet1>767 FIFTH AVE</regStreet1>
      <regStreet2>49TH FL</regStreet2>
      <regCity>NEW YORK</regCity>
      <regStateConditional regCountry="US" regState="US-NY"/>
      <regZipOrPostalCode>10153</regZipOrPostalCode>
      <regPhone>212-583-2000</regPhone>
      <seriesName>BARON GROWTH FUND</seriesName>
      <seriesId>S000000583</seriesId>
      <seriesLei>5493003RB1W6V2NH4T78</seriesLei>
      <repPdEnd>2026-09-30</repPdEnd>
      <repPdDate>2026-03-31</repPdDate>
      <isFinalFiling>N</isFinalFiling>
    </genInfo>
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      <totLiabs>369067894.99</totLiabs>
      <netAssets>2613318428.81</netAssets>
      <assetsAttrMiscSec>0.00000000</assetsAttrMiscSec>
      <assetsInvested>0.00000000</assetsInvested>
      <amtPayOneYrBanksBorr>0.00000000</amtPayOneYrBanksBorr>
      <amtPayOneYrCtrldComp>0.00000000</amtPayOneYrCtrldComp>
      <amtPayOneYrOthAffil>0.00000000</amtPayOneYrOthAffil>
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      <amtPayAftOneYrBanksBorr>0.00000000</amtPayAftOneYrBanksBorr>
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      <amtPayAftOneYrOther>0.00000000</amtPayAftOneYrOther>
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      <standByCommit>0.00000000</standByCommit>
      <liquidPref>0.00000000</liquidPref>
      <cshNotRptdInCorD>106049.20000000</cshNotRptdInCorD>
      <isNonCashCollateral>N</isNonCashCollateral>
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        <monthlyTotReturns>
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        <name>FactSet Research Systems Inc</name>
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        <name>Gartner Inc</name>
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        <name>FARMERS BUSINESS NETWORK COMMO</name>
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        <name>Vail Resorts Inc</name>
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      <invstOrSec>
        <name>Arch Capital Group Ltd</name>
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      </invstOrSec>
    </invstOrSecs>
    <signature>
      <ncom:dateSigned>2026-04-22</ncom:dateSigned>
      <ncom:nameOfApplicant>BARON INVESTMENT FUNDS TRUST (f/k/a BARON ASSET FUND)</ncom:nameOfApplicant>
      <ncom:signature>Christopher Snively</ncom:signature>
      <ncom:signerName>Christopher Snively</ncom:signerName>
      <ncom:title>Chief Financial Officer and Treasurer</ncom:title>
    </signature>
  </formData>
</edgarSubmission>
