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      <registrantType>IM</registrantType>
      <liveTestFlag>LIVE</liveTestFlag>
      <filer>
        <issuerCredentials>
          <cik>0001145255</cik>
          <ccc>XXXXXXXX</ccc>
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      <flags>
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      <periodOfReport>06/30/2026</periodOfReport>
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      <yearOrQuarter>YEAR</yearOrQuarter>
      <reportCalendarYear>2026</reportCalendarYear>
      <reportingPerson>
        <name>HENNESSY ADVISORS INC</name>
        <phoneNumber>1-800-966-4354</phoneNumber>
        <address>
          <com:street1>7250 Redwood Blvd., Suite 200</com:street1>
          <com:city>Novato</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>94945</com:zipCode>
        </address>
      </reportingPerson>
      <reportInfo>
        <reportType>INSTITUTIONAL MANAGER NOTICE REPORT</reportType>
        <noticeExplanation>ALL VOTES BY OTHER PERSONS</noticeExplanation>
        <confidentialTreatment>N</confidentialTreatment>
      </reportInfo>
      <fileNumber>028-06715</fileNumber>
      <reportingCrdNumber>000110770</reportingCrdNumber>
      <reportingSecFileNumber>801-36288</reportingSecFileNumber>
      <leiNumber>549300OM5HCSFZO7FR31</leiNumber>
      <otherManagersInfo>
        <otherManager>
          <icaOr13FFileNumber>811-07168</icaOr13FFileNumber>
          <leiNumberOM>254900O0F8MQNN7UZ261</leiNumberOM>
          <managerName>Hennessy Funds Trust</managerName>
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      <explanatoryInformation>
        <explanatoryChoice>N</explanatoryChoice>
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    <signaturePage>
      <reportingPerson>HENNESSY ADVISORS INC</reportingPerson>
      <txSignature>Teresa M. Nilsen</txSignature>
      <txPrintedSignature>Teresa M. Nilsen</txPrintedSignature>
      <txTitle>President and Chief Operating Officer</txTitle>
      <txAsOfDate>08/13/2026</txAsOfDate>
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