-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 QuzVoWoJNvyr6ay3L4Qo3Uc/0xXQnQDa5e3xRMoQNBHaDpmpNN1VrdlboYgsy2dS
 zN2yr6tPI/ByRbdQjLVgfQ==

<SEC-DOCUMENT>0001209191-06-018049.txt : 20060316
<SEC-HEADER>0001209191-06-018049.hdr.sgml : 20060316
<ACCEPTANCE-DATETIME>20060316121355
ACCESSION NUMBER:		0001209191-06-018049
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20060315
FILED AS OF DATE:		20060316
DATE AS OF CHANGE:		20060316

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SENOMYX INC
		CENTRAL INDEX KEY:			0001123979
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH [8731]
		IRS NUMBER:				330843840
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		11099 N TORREY PINES ROAD
		STREET 2:		SUITE 160
		CITY:			LA JOLLA
		STATE:			CA
		ZIP:			92037
		BUSINESS PHONE:		8586468300

	MAIL ADDRESS:	
		STREET 1:		11099 N TORREY PINES RD SUITE 160
		CITY:			LA JOLLA
		STATE:			CA
		ZIP:			92037

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			LEONHARDT HARRY J
		CENTRAL INDEX KEY:			0001286102

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-50791
		FILM NUMBER:		06690695

	MAIL ADDRESS:	
		STREET 1:		11088 N TORREY PINES RD
		STREET 2:		C/O SENOMYX INC
		CITY:			LA JOLLA
		STATE:			CA
		ZIP:			92037
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>bsd18021_bsd9hjl.xml
<DESCRIPTION>MAIN DOCUMENT DESCRIPTION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2006-03-15</periodOfReport>

    <issuer>
        <issuerCik>0001123979</issuerCik>
        <issuerName>SENOMYX INC</issuerName>
        <issuerTradingSymbol>SNMX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001286102</rptOwnerCik>
            <rptOwnerName>LEONHARDT HARRY J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>11099 N. TORREY PINES ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>LA JOLLA</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92037</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>SVP, Gen. Counsel &amp; Corp. Sec.</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, $.001 par value per share</value>
            </securityTitle>
            <transactionDate>
                <value>2006-03-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>2000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>15.78</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>81391</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Reported transaction occurred pursuant to Rule 10B5-1 Plan.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Harry J. Leonhardt</signatureName>
        <signatureDate>2006-03-16</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----