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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 KckaRmcrhGDuZuEyQDHo5dJSpoM4etyTLUWp7v8kcZ7/GFP8810WiOQERVv9Ye9D
 EnSO1JGf85OJdJ1ZLE8fqw==

<SEC-DOCUMENT>0001181431-03-013791.txt : 20030724
<SEC-HEADER>0001181431-03-013791.hdr.sgml : 20030724
<ACCEPTANCE-DATETIME>20030711131644
ACCESSION NUMBER:		0001181431-03-013791
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030701
FILED AS OF DATE:		20030711

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SAUNDERS SHAWN E
		CENTRAL INDEX KEY:			0001253289

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-25034
		FILM NUMBER:		03783344

	BUSINESS ADDRESS:	
		STREET 1:		2860 W BAYSHORE RD
		CITY:			PALO ALTO
		STATE:			CA
		ZIP:			94303
		BUSINESS PHONE:		6508138200

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			GREATER BAY BANCORP
		CENTRAL INDEX KEY:			0000775473
		STANDARD INDUSTRIAL CLASSIFICATION:	NATIONAL COMMERCIAL BANKS [6021]
		IRS NUMBER:				770387041
		STATE OF INCORPORATION:			CA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		2860 WEST BAYSHORE ROAD
		CITY:			PALO ALTO
		STATE:			CA
		ZIP:			94303
		BUSINESS PHONE:		4153751555

	MAIL ADDRESS:	
		STREET 1:		2860 BAYSHORE ROAD
		STREET 2:		420 COWPER ST
		CITY:			PALO ALTO
		STATE:			CA
		ZIP:			943011504

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MID PENINSULA BANCORP
		DATE OF NAME CHANGE:	19941031

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SAN MATEO COUNTY BANCORP
		DATE OF NAME CHANGE:	19920703
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>rrd13014.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0101</schemaVersion>

    <documentType>3</documentType>
<periodOfReport>2003-07-01</periodOfReport>
    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000775473</issuerCik>
        <issuerName>GREATER BAY BANCORP</issuerName>
        <issuerTradingSymbol>GBBK</issuerTradingSymbol></issuer>
<reportingOwner>
<reportingOwnerId>
            <rptOwnerCik>0001253289</rptOwnerCik>
            <rptOwnerName>SAUNDERS SHAWN E</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>  </rptOwnerStreet1>
            <rptOwnerStreet2>  </rptOwnerStreet2>
            <rptOwnerCity>  </rptOwnerCity>
            <rptOwnerState>  </rptOwnerState>
            <rptOwnerZipCode>  </rptOwnerZipCode>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>0</isDirector>
<isOfficer>1</isOfficer>
<isTenPercentOwner>0</isTenPercentOwner>
<isOther>0</isOther>
<officerTitle>EVP, Finance &amp; Accounting</officerTitle>
<otherText></otherText></reportingOwnerRelationship></reportingOwner>
<nonDerivativeSecurity>
<securityTitle>
<value>Common Stock</value></securityTitle>
<transactionAmounts>
<transactionShares>
<value>6000</value></transactionShares></transactionAmounts>
<ownershipNature>
<directOrIndirectOwnership>
<value>D</value></directOrIndirectOwnership>
<natureOfOwnership>
<value></value></natureOfOwnership></ownershipNature></nonDerivativeSecurity>
<nonDerivativeSecurity>
<securityTitle>
<value>Common Stock</value></securityTitle>
<transactionAmounts>
<transactionShares>
<value>3333</value>
<footnoteId id="F1"/></transactionShares></transactionAmounts>
<ownershipNature>
<directOrIndirectOwnership>
<value>D</value></directOrIndirectOwnership>
<natureOfOwnership>
<value></value></natureOfOwnership></ownershipNature></nonDerivativeSecurity>
<derivativeSecurity>
<securityTitle>
<value>Incentive Stock Option (right to buy)</value></securityTitle>
<conversionOrExercisePrice>
<value>16.75</value></conversionOrExercisePrice>
<exerciseDate>
<value>1999-12-15</value>
<footnoteId id="F2"/></exerciseDate>
<expirationDate>
<value>2008-12-15</value></expirationDate>
<underlyingSecurity>
<underlyingSecurityTitle>
<value>Common Stock</value></underlyingSecurityTitle>
<underlyingSecurityShares>
<value>6022</value></underlyingSecurityShares></underlyingSecurity>
<ownershipNature>
<directOrIndirectOwnership>
<value>D</value></directOrIndirectOwnership>
<natureOfOwnership>
<value></value></natureOfOwnership></ownershipNature></derivativeSecurity>
<derivativeSecurity>
<securityTitle>
<value>Non-Qualified Stock Option (right to buy)</value></securityTitle>
<conversionOrExercisePrice>
<value>16.75</value></conversionOrExercisePrice>
<exerciseDate>
<value>1999-12-15</value>
<footnoteId id="F2"/></exerciseDate>
<expirationDate>
<value>2008-12-15</value></expirationDate>
<underlyingSecurity>
<underlyingSecurityTitle>
<value>Common Stock</value></underlyingSecurityTitle>
<underlyingSecurityShares>
<value>1578</value></underlyingSecurityShares></underlyingSecurity>
<ownershipNature>
<directOrIndirectOwnership>
<value>D</value></directOrIndirectOwnership>
<natureOfOwnership>
<value></value></natureOfOwnership></ownershipNature></derivativeSecurity>
<derivativeSecurity>
<securityTitle>
<value>Incentive Stock Option (right to buy)</value></securityTitle>
<conversionOrExercisePrice>
<value>19.25</value></conversionOrExercisePrice>
<exerciseDate>
<value>2000-12-21</value>
<footnoteId id="F2"/></exerciseDate>
<expirationDate>
<value>2009-12-21</value></expirationDate>
<underlyingSecurity>
<underlyingSecurityTitle>
<value>Common Stock</value></underlyingSecurityTitle>
<underlyingSecurityShares>
<value>5488</value></underlyingSecurityShares></underlyingSecurity>
<ownershipNature>
<directOrIndirectOwnership>
<value>D</value></directOrIndirectOwnership>
<natureOfOwnership>
<value></value></natureOfOwnership></ownershipNature></derivativeSecurity>
<derivativeSecurity>
<securityTitle>
<value>Non-Qualified Stock Option (right to buy)</value></securityTitle>
<conversionOrExercisePrice>
<value>19.25</value></conversionOrExercisePrice>
<exerciseDate>
<value>2000-12-21</value>
<footnoteId id="F2"/></exerciseDate>
<expirationDate>
<value>2009-12-21</value></expirationDate>
<underlyingSecurity>
<underlyingSecurityTitle>
<value>Common Stock</value></underlyingSecurityTitle>
<underlyingSecurityShares>
<value>5312</value></underlyingSecurityShares></underlyingSecurity>
<ownershipNature>
<directOrIndirectOwnership>
<value>D</value></directOrIndirectOwnership>
<natureOfOwnership>
<value></value></natureOfOwnership></ownershipNature></derivativeSecurity>
<derivativeSecurity>
<securityTitle>
<value>Incentive Stock Option (right to buy)</value></securityTitle>
<conversionOrExercisePrice>
<value>37.125</value></conversionOrExercisePrice>
<exerciseDate>
<value>2001-12-19</value>
<footnoteId id="F2"/></exerciseDate>
<expirationDate>
<value>2010-12-19</value></expirationDate>
<underlyingSecurity>
<underlyingSecurityTitle>
<value>Common Stock</value></underlyingSecurityTitle>
<underlyingSecurityShares>
<value>3426</value></underlyingSecurityShares></underlyingSecurity>
<ownershipNature>
<directOrIndirectOwnership>
<value>D</value></directOrIndirectOwnership>
<natureOfOwnership>
<value></value></natureOfOwnership></ownershipNature></derivativeSecurity>
<derivativeSecurity>
<securityTitle>
<value>Non-Qualified Stock Option (right to buy)</value></securityTitle>
<conversionOrExercisePrice>
<value>37.125</value></conversionOrExercisePrice>
<exerciseDate>
<value>2001-12-19</value>
<footnoteId id="F2"/></exerciseDate>
<expirationDate>
<value>2010-12-19</value></expirationDate>
<underlyingSecurity>
<underlyingSecurityTitle>
<value>Common Stock</value></underlyingSecurityTitle>
<underlyingSecurityShares>
<value>9574</value></underlyingSecurityShares></underlyingSecurity>
<ownershipNature>
<directOrIndirectOwnership>
<value>D</value></directOrIndirectOwnership>
<natureOfOwnership>
<value></value></natureOfOwnership></ownershipNature></derivativeSecurity>
<derivativeSecurity>
<securityTitle>
<value>Incentive Stock Option (right to buy)</value></securityTitle>
<conversionOrExercisePrice>
<value>25.73</value></conversionOrExercisePrice>
<exerciseDate>
<value>2002-12-10</value>
<footnoteId id="F2"/></exerciseDate>
<expirationDate>
<value>2011-12-10</value></expirationDate>
<underlyingSecurity>
<underlyingSecurityTitle>
<value>Common Stock</value></underlyingSecurityTitle>
<underlyingSecurityShares>
<value>3637</value></underlyingSecurityShares></underlyingSecurity>
<ownershipNature>
<directOrIndirectOwnership>
<value>D</value></directOrIndirectOwnership>
<natureOfOwnership>
<value></value></natureOfOwnership></ownershipNature></derivativeSecurity>
<derivativeSecurity>
<securityTitle>
<value>Non-Qualified Stock Option (right to buy)</value></securityTitle>
<conversionOrExercisePrice>
<value>25.73</value></conversionOrExercisePrice>
<exerciseDate>
<value>2002-12-10</value>
<footnoteId id="F2"/></exerciseDate>
<expirationDate>
<value>2011-12-10</value></expirationDate>
<underlyingSecurity>
<underlyingSecurityTitle>
<value>Common Stock</value></underlyingSecurityTitle>
<underlyingSecurityShares>
<value>13863</value></underlyingSecurityShares></underlyingSecurity>
<ownershipNature>
<directOrIndirectOwnership>
<value>D</value></directOrIndirectOwnership>
<natureOfOwnership>
<value></value></natureOfOwnership></ownershipNature></derivativeSecurity>
<derivativeSecurity>
<securityTitle>
<value>Incentive Stock Option (right to buy)</value></securityTitle>
<conversionOrExercisePrice>
<value>14.181</value></conversionOrExercisePrice>
<exerciseDate>
<value>2004-03-25</value>
<footnoteId id="F2"/></exerciseDate>
<expirationDate>
<value>2013-03-25</value></expirationDate>
<underlyingSecurity>
<underlyingSecurityTitle>
<value>Common Stock</value></underlyingSecurityTitle>
<underlyingSecurityShares>
<value>7701</value></underlyingSecurityShares></underlyingSecurity>
<ownershipNature>
<directOrIndirectOwnership>
<value>D</value></directOrIndirectOwnership>
<natureOfOwnership>
<value></value></natureOfOwnership></ownershipNature></derivativeSecurity>
<derivativeSecurity>
<securityTitle>
<value>Non-Qualified Stock Option (right to buy)</value></securityTitle>
<conversionOrExercisePrice>
<value>14.181</value></conversionOrExercisePrice>
<exerciseDate>
<value>2004-03-25</value>
<footnoteId id="F2"/></exerciseDate>
<expirationDate>
<value>2013-03-25</value></expirationDate>
<underlyingSecurity>
<underlyingSecurityTitle>
<value>Common Stock</value></underlyingSecurityTitle>
<underlyingSecurityShares>
<value>9799</value></underlyingSecurityShares></underlyingSecurity>
<ownershipNature>
<directOrIndirectOwnership>
<value>D</value></directOrIndirectOwnership>
<natureOfOwnership>
<value></value></natureOfOwnership></ownershipNature></derivativeSecurity>
<footnotes>
<footnote id="F1">Restricted shares granted under the Issuer&apos;s 1996 Stock Option Plan.  Restrictions lapse 50% on 12/31/03, 25% on 4/10/04 and 25% on 4/10/05.</footnote>
<footnote id="F2">20% vesting each anniversary with a one year waiting period.  Fully vested in five years.</footnote></footnotes>
<ownerSignature>
<signatureName>Shawn E. Saunders</signatureName>
<signatureDate>2003-07-11</signatureDate></ownerSignature></ownershipDocument>


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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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