<SUBMISSION>
<ACCESSION-NUMBER>0001209191-11-019060
<TYPE>4
<PUBLIC-DOCUMENT-COUNT>2
<PERIOD>20110317
<FILING-DATE>20110321
<DATE-OF-FILING-DATE-CHANGE>20110321
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>Skelton Daniel K
<CIK>0001438909
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>4
<ACT>34
<FILE-NUMBER>001-33710
<FILM-NUMBER>11702288
</FILING-VALUES>
<MAIL-ADDRESS>
<STREET1>300 ATLANTIC STREET
<STREET2>SUITE 702
<CITY>STAMFORD
<STATE>CT
<ZIP>06903
</MAIL-ADDRESS>
</REPORTING-OWNER>
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>CLEAN DIESEL TECHNOLOGIES INC
<CIK>0000949428
<ASSIGNED-SIC>2810
<IRS-NUMBER>061393453
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>4567 TELEPHONE ROAD
<STREET2>SUITE 206
<CITY>VENTURA
<STATE>CA
<ZIP>93003
<PHONE>805 639 9458
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>4567 TELEPHONE ROAD
<STREET2>SUITE 206
<CITY>VENTURA
<STATE>CA
<ZIP>93003
</MAIL-ADDRESS>
</ISSUER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>c14444_4x1.xml
<DESCRIPTION>MAIN DOCUMENT DESCRIPTION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2011-03-17</periodOfReport>

    <issuer>
        <issuerCik>0000949428</issuerCik>
        <issuerName>CLEAN DIESEL TECHNOLOGIES INC</issuerName>
        <issuerTradingSymbol>CDTI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001438909</rptOwnerCik>
            <rptOwnerName>Skelton Daniel K</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CLEAN DIESEL TECHNOLOGIES, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>4567 TELEPHONE ROAD, SUITE 206</rptOwnerStreet2>
            <rptOwnerCity>VENTURA</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>93003</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Vice President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>5.68</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2011-03-17</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>5000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2011-03-17</value>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2021-03-17</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>5000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Vest 50% at grant date and 50% on first anniversary of grant date.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Kristi Cushing for Daniel K. Skelton</signatureName>
        <signatureDate>2011-03-21</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>c14444_24.htm
<DESCRIPTION>POWER OF ATTORNEY
<TEXT>
<html>
<head><title>Power of Attorney</title></head>
<body><DIV style="width: 7.5in; font-family: Arial,sans-serif; margin-left: 0.25in">

<P style="font-size: 10pt" align="center"><B>POWER OF ATTORNEY</B>

<P style="text-indent: 4%; font-size: 10pt" align="justify">Know all by these
presents, that the undersigned hereby constitutes and appoints each <U>Nikhil
Mehta</U>, <U>Kristi Cushing</U> and <U>Casey Owen</U>, or any of them signing
singly, and with full power of substitution, the undersigned&#8217;s true and
lawful attorney-in-fact to:

<P>
<TABLE style="font-size: 10pt" border="0" cellspacing="0" cellpadding="0"
width="100%">

 <TR
style="background: none transparent scroll repeat 0% 0%; color: #000000; font-size: 10pt"
valign="top">
  <TD style="background: none transparent scroll repeat 0% 0%"
width="4%">&nbsp;</TD>
  <TD width="3%" nowrap align="left">(1)</TD>
  <TD width="1%">&nbsp;</TD>
  <TD>
<DIV style="text-align: justify">prepare, execute in the undersigned&#8217;s
name and on the undersigned&#8217;s behalf, and submit to the U.S. Securities
and Exchange Commission (the &#8220;<B>SEC</B>&#8221;) a Form&nbsp;ID,
including amendments thereto, and any other documents necessary or appropriate
to obtain codes and passwords enabling the undersigned to make electronic
filings with the SEC of reports required by Section 16(a) of the Securities
Exchange Act of 1934 or any rule or regulation of the SEC;</DIV>
</TD>
 </TR>

</TABLE>


<P>
<TABLE style="font-size: 10pt" border="0" cellspacing="0" cellpadding="0"
width="100%">

 <TR
style="background: none transparent scroll repeat 0% 0%; color: #000000; font-size: 10pt"
valign="top">
  <TD style="background: none transparent scroll repeat 0% 0%"
width="4%">&nbsp;</TD>
  <TD width="3%" nowrap align="left">(2)</TD>
  <TD width="1%">&nbsp;</TD>
  <TD>
<DIV style="text-align: justify">execute for and on behalf of the undersigned,
in the undersigned&#8217;s capacity as an officer and/or director of <U>Clean
Diesel Technologies, Inc. </U>(the &#8220;<B>Company</B>&#8221;), Forms&nbsp;3,
4, and 5 in accordance with Section&nbsp;16(a) of the Securities Exchange Act
of 1934 and the rules thereunder, as amended;</DIV>
</TD>
 </TR>

</TABLE>


<P>
<TABLE style="font-size: 10pt" border="0" cellspacing="0" cellpadding="0"
width="100%">

 <TR
style="background: none transparent scroll repeat 0% 0%; color: #000000; font-size: 10pt"
valign="top">
  <TD style="background: none transparent scroll repeat 0% 0%"
width="4%">&nbsp;</TD>
  <TD width="3%" nowrap align="left">(3)</TD>
  <TD width="1%">&nbsp;</TD>
  <TD>
<DIV style="text-align: justify">do and perform any and all acts for and on
behalf of the undersigned that may be necessary or desirable to complete and
execute any such Form&nbsp;3, 4, or 5, complete and execute any amendment or
amendments thereto, and timely file such form with the SEC and any stock
exchange or similar authority; and</DIV>
</TD>
 </TR>

</TABLE>


<P>
<TABLE style="font-size: 10pt" border="0" cellspacing="0" cellpadding="0"
width="100%">

 <TR
style="background: none transparent scroll repeat 0% 0%; color: #000000; font-size: 10pt"
valign="top">
  <TD style="background: none transparent scroll repeat 0% 0%"
width="4%">&nbsp;</TD>
  <TD width="3%" nowrap align="left">(4)</TD>
  <TD width="1%">&nbsp;</TD>
  <TD>
<DIV style="text-align: justify">take any other action of any type whatsoever
in connection with the foregoing that, in the opinion of such attorney-in-fact,
may be of benefit to, in the best interest of, or legally required by, the
undersigned, it being understood that the documents executed by such
attorney-in-fact on behalf of the undersigned pursuant to this Power of
Attorney shall be in such form and shall contain such terms and conditions as
such attorney-in-fact may approve in such attorney-in-fact&#8217;s
discretion.</DIV>
</TD>
 </TR>

</TABLE>


<P style="text-indent: 4%; font-size: 10pt" align="justify">The undersigned
hereby grants to each such attorney-in-fact full power and authority to
do and perform any and every act and thing whatsoever requisite, necessary, or
proper to be done in the exercise of any of the rights and powers herein
granted, as fully to all intents and purposes as the undersigned might or could
do if personally present, with full power of substitution or revocation, hereby
ratifying and confirming all that such attorney-in-fact, or such
attorney-in-fact&#8217;s substitute or substitutes, shall lawfully do or cause
to be done by virtue of this power of attorney and the rights and powers herein
granted. The undersigned acknowledges that the foregoing attorneys-in-fact, in
serving in such capacity at the request of the undersigned, are not assuming,
nor is the Company assuming, any of the undersigned&#8217;s responsibilities to
comply with Section&nbsp;16 of the Securities Exchange Act of 1934, as amended.

<P style="text-indent: 4%; font-size: 10pt" align="justify">This Power of
Attorney shall remain in full force and effect until the undersigned is no
longer required to file Forms&nbsp;3, 4, and 5 with respect to the
undersigned&#8217;s holdings of and transactions in securities issued by the
Company, unless earlier revoked by the undersigned in a signed writing
delivered to the foregoing attorneys-in-fact.

<P style="text-indent: 4%; font-size: 10pt" align="justify">IN WITNESS WHEREOF,
the undersigned has caused this Power of Attorney to be executed as of this 4th
day of November, 2010.

<DIV style="margin-left: 46%; font-size: 10pt" align="justify"><U>/s/ Dan
Skelton&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U>

</DIV>
<TABLE style="font-size: 10pt" border="0" cellspacing="0" cellpadding="0"
width="100%">

 <TR
style="background: none transparent scroll repeat 0% 0%; color: #000000; font-size: 10pt"
valign="top">
  <TD width="45%" nowrap align="left">&nbsp;</TD>
  <TD width="1%">&nbsp;</TD>
  <TD>
<DIV style="text-align: justify">Signature</DIV>
</TD>
 </TR>

</TABLE>


<P style="margin-left: 46%; font-size: 10pt" align="justify"><U>Dan
Skelton&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U>
<BR>
Print Name

<P style="font-size: 10pt" align="center">&nbsp;

<P style="display: none; font-size: 10pt" align="center">&nbsp;
</DIV>

</body>
</html>
</TEXT>
</DOCUMENT>
</SUBMISSION>
