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  <headerData>
    <submissionType>13F-HR</submissionType>
    <filerInfo>
      <liveTestFlag>LIVE</liveTestFlag>
      <flags>
        <confirmingCopyFlag>false</confirmingCopyFlag>
        <returnCopyFlag>true</returnCopyFlag>
        <overrideInternetFlag>false</overrideInternetFlag>
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      <filer>
        <credentials>
          <cik>0001274173</cik>
          <ccc>XXXXXXXX</ccc>
        </credentials>
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      <periodOfReport>03-31-2015</periodOfReport>
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      <reportCalendarOrQuarter>03-31-2015</reportCalendarOrQuarter>
      <filingManager>
        <name>HENDERSON GROUP PLC</name>
        <address>
          <ns1:street1>201 BISHOPSGATE</ns1:street1>
          <ns1:city>LONDON</ns1:city>
          <ns1:stateOrCountry>X0</ns1:stateOrCountry>
          <ns1:zipCode>EC2M 3AE</ns1:zipCode>
        </address>
      </filingManager>
      <reportType>13F HOLDINGS REPORT</reportType>
      <form13FFileNumber>028-10904</form13FFileNumber>
      <provideInfoForInstruction5>N</provideInfoForInstruction5>
    </coverPage>
    <signatureBlock>
      <name>Charles Jones</name>
      <title>Global Head of Compliance</title>
      <phone>44 207-818-3878</phone>
      <signature>/s/  Charles Jones</signature>
      <city>London</city>
      <stateOrCountry>X0</stateOrCountry>
      <signatureDate>05-13-2015</signatureDate>
    </signatureBlock>
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      <tableEntryTotal>968</tableEntryTotal>
      <tableValueTotal>12513555</tableValueTotal>
      <isConfidentialOmitted>false</isConfidentialOmitted>
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            <form13FFileNumber>028-07704</form13FFileNumber>
            <name>HENDERSON FUND MANAGEMENT Ltd</name>
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            <cik>0001280107</cik>
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            <name>HENDERSON GLOBAL INVESTORS HOLDINGS Ltd</name>
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            <cik>0001280110</cik>
            <form13FFileNumber>028-10906</form13FFileNumber>
            <name>HENDERSON GLOBAL INVESTORS LTD</name>
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        <otherManager2>
          <sequenceNumber>5</sequenceNumber>
          <otherManager>
            <cik>0001315811</cik>
            <form13FFileNumber>028-11183</form13FFileNumber>
            <name>HENDERSON GLOBAL INVESTORS (NORTH AMERICA) INC.</name>
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            <name>HENDERSON INVESTMENT MANAGEMENT LTD</name>
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          <sequenceNumber>7</sequenceNumber>
          <otherManager>
            <cik>0001457236</cik>
            <form13FFileNumber>028-13597</form13FFileNumber>
            <name>Henderson Alternative Investment Advisor Ltd</name>
          </otherManager>
        </otherManager2>
        <otherManager2>
          <sequenceNumber>8</sequenceNumber>
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            <cik>0001009232</cik>
            <form13FFileNumber>028-03935</form13FFileNumber>
            <name>GENEVA CAPITAL MANAGEMENT LLC</name>
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          <sequenceNumber>9</sequenceNumber>
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            <cik>0000073124</cik>
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            <name>NORTHERN TRUST CORP</name>
          </otherManager>
        </otherManager2>
      </otherManagers2Info>
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