<SUBMISSION>
<ACCESSION-NUMBER>0001320922-08-000008
<TYPE>5
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20071231
<FILING-DATE>20080115
<DATE-OF-FILING-DATE-CHANGE>20080115
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>NBT BANCORP INC
<CIK>0000790359
<ASSIGNED-SIC>6021
<IRS-NUMBER>161268674
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>52 S BROAD ST
<CITY>NORWICH
<STATE>NY
<ZIP>13815
<PHONE>6073372265
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>52 S. BROAD STREET
<CITY>NORWICH
<STATE>NY
<ZIP>13815
</MAIL-ADDRESS>
</ISSUER>
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>DIETRICH MARTIN A
<CIK>0001204704
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>5
<ACT>34
<FILE-NUMBER>000-14703
<FILM-NUMBER>08531608
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>52 S BROAD ST
<CITY>NORWICH
<STATE>NY
<ZIP>13815
<PHONE>6075476068
</BUSINESS-ADDRESS>
</REPORTING-OWNER>
<DOCUMENT>
<TYPE>5
<SEQUENCE>1
<FILENAME>edgardoc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
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<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>5</documentType>

    <periodOfReport>2007-12-31</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

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    <form4TransactionsReported>0</form4TransactionsReported>

    <issuer>
        <issuerCik>0000790359</issuerCik>
        <issuerName>NBT BANCORP INC</issuerName>
        <issuerTradingSymbol>NBTB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001204704</rptOwnerCik>
            <rptOwnerName>DIETRICH MARTIN A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>52 SOUTH BROAD STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NORWICH</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>13815</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President/CEO NBT Bancorp</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

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        <nonDerivativeTransaction>
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            <ownershipNature>
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                <natureOfOwnership>
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        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
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                <underlyingSecurityTitle>
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            <underlyingSecurity>
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                </underlyingSecurityTitle>
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            <expirationDate>
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                <underlyingSecurityTitle>
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            <underlyingSecurity>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>NBT Bancorp Inc. Common Stock</value>
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                <underlyingSecurityShares>
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            <exerciseDate>
                <value>2009-12-27</value>
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            <expirationDate>
                <value>2017-12-27</value>
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                <underlyingSecurityTitle>
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                <value>2008-01-01</value>
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            <expirationDate>
                <value>2017-01-01</value>
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                <underlyingSecurityTitle>
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                    <value>28000</value>
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    </derivativeTable>

    <footnotes>
        <footnote id="F1">Shares acquired under NBT Bancorp Dividend Reinvestment Plan during period of January 1, 2007 to December 31, 2007 at prices ranging from $22.6543 to $23.7832 per share.</footnote>
        <footnote id="F2">Shares were purchased from 1/1/2007 through 12/31/2007 through NBT Bancorp Inc. 401k Plan.</footnote>
        <footnote id="F3">Shares were purchased from 1/1/2007 through 12/31/2007 through NBT Bancorp Inc. ESOP Plan.</footnote>
        <footnote id="F4">Pursuant to NBT Bancorp Inc. 1993 Stock Option Plan grant vests 40% for first year, 20% annually for following years.</footnote>
        <footnote id="F5">Pursuant to NBT Bancorp Inc. 1993 Stock Option Plan reload grant vests 100% two years after date of its grant.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>By: Michael J. Chewens, Power of Attorney  For: Martin A. Dietrich</signatureName>
        <signatureDate>2008-01-15</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
