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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 UdaxdCMjiKzOVK4t//7Fm35Bb+cwWkLRyzfowbXi8GZ40S472ZZmthbbaldwdPha
 0iEl5XIklg3jpkJpc3p1+Q==

<SEC-DOCUMENT>0001187961-03-000001.txt : 20030702
<SEC-HEADER>0001187961-03-000001.hdr.sgml : 20030702
<ACCEPTANCE-DATETIME>20030702125503
ACCESSION NUMBER:		0001187961-03-000001
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030701
FILED AS OF DATE:		20030702

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MONTEREY BAY BANCORP INC
		CENTRAL INDEX KEY:			0000930429
		STANDARD INDUSTRIAL CLASSIFICATION:	SAVINGS INSTITUTION, FEDERALLY CHARTERED [6035]
		IRS NUMBER:				770381362
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		567 AUTO CENTER DR
		CITY:			WATSONVILLE
		STATE:			CA
		ZIP:			95076
		BUSINESS PHONE:		8317684800

	MAIL ADDRESS:	
		STREET 1:		567 AUTO CENTER DR
		CITY:			WATSONVILLE
		STATE:			CA
		ZIP:			95076

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			AIVES RITA
		CENTRAL INDEX KEY:			0001187961

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-24842
		FILM NUMBER:		03770698

	BUSINESS ADDRESS:	
		STREET 1:		567 AUTO CENTER DR
		CITY:			WATWONVILLE
		STATE:			CA
		ZIP:			95076
		BUSINESS PHONE:		8317684800

	MAIL ADDRESS:	
		STREET 1:		567 CENTER DR
		CITY:			WATSONVILLE
		STATE:			CA
		ZIP:			95076
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0101</schemaVersion>

    <documentType>4</documentType><periodOfReport>2003-07-01</periodOfReport><notSubjectToSection16>1</notSubjectToSection16>
    <issuer>
        <issuerCik>0000930429</issuerCik>
        <issuerName>MONTEREY BAY BANCORP INC</issuerName>
        <issuerTradingSymbol>MBBC</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId>
            <rptOwnerCik>0001187961</rptOwnerCik>
            <rptOwnerName>AIVES RITA</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>  </rptOwnerStreet1>
            <rptOwnerStreet2>  </rptOwnerStreet2>
            <rptOwnerCity>  </rptOwnerCity>
            <rptOwnerState>  </rptOwnerState>
            <rptOwnerZipCode>  </rptOwnerZipCode>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>1</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther></reportingOwnerRelationship></reportingOwner><nonDerivativeSecurity><securityTitle><value>Common Stock</value></securityTitle><transactionDate><value>2003-07-01</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>J</transactionCode><equitySwapInvolved>0</equitySwapInvolved><footnoteId id="F1"/></transactionCoding><transactionAmounts><transactionShares><value>401</value></transactionShares><transactionValue><value>26.3245</value><footnoteId id="F1"/></transactionValue><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>0</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value></value></natureOfOwnership></ownersh
ipNature></nonDerivativeSecurity><footnotes><footnote id="F1">Stock disposed of pursuant to the Agreement and Plan of Merger (&amp;quot;the Merger Agreement&amp;quot;) by and among Union Bank of California, N.A., UnionBanCal Corporation, Monterey Bay Bank and Monterey Bay Bancorp, Inc. dated April 7, 2003 in exchange for either approximately 0.6269 of a share of UnionBanCal Corporation common stock (having a value of $41.993 average closing price as specified in the Merger Agreement) or approximately $26.3245 per share in cash. </footnote></footnotes><ownerSignature><signatureName>Rita Alves</signatureName><signatureDate>2003-07-02</signatureDate></ownerSignature></ownershipDocument>

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