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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,
 Ahd+EOkLzWIWprAC1WoN5Dp2tOsz//fFqAwhcsbVk7oO55gE28bB+S5fuTrcZgRJ
 M/MXHkcyJYXDRQGVfK+ZSg==

<SEC-DOCUMENT>0001262063-03-000009.txt : 20031030
<SEC-HEADER>0001262063-03-000009.hdr.sgml : 20031030
<ACCEPTANCE-DATETIME>20031030132158
ACCESSION NUMBER:		0001262063-03-000009
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20031020
FILED AS OF DATE:		20031030

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			WU PETER
		CENTRAL INDEX KEY:			0001186026

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-31830
		FILM NUMBER:		03966023

	BUSINESS ADDRESS:	
		STREET 1:		800 WEST SIXTH STREET, 15TH FLOOR
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90017
		BUSINESS PHONE:		213-972-4217

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CATHAY BANCORP INC
		CENTRAL INDEX KEY:			0000861842
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		IRS NUMBER:				954274680
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		777 N BROADWAY
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90012
		BUSINESS PHONE:		2136254700

	MAIL ADDRESS:	
		STREET 1:		777 NORTH BROADWAY
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90012
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>3</documentType><periodOfReport>2003-10-20</periodOfReport>
    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000861842</issuerCik>
        <issuerName>CATHAY BANCORP INC</issuerName>
        <issuerTradingSymbol>CATY</issuerTradingSymbol></issuer><reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001186026</rptOwnerCik>
            <rptOwnerName>WU PETER</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>777 NORTH BROADWAY</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>LOS ANGELES</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90012</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>1</isDirector><isOfficer>1</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther><officerTitle>Executive Vice Chairman/COO</officerTitle></reportingOwnerRelationship></reportingOwner><nonDerivativeTable><nonDerivativeHolding><securityTitle><value>Common Stock</value></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>395828</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>Wu Trust</value></natureOfOwnership></ownershipNature></nonDerivativeHolding><nonDerivativeHolding><securityTitle><value>Common Stock</value></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>25063</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>Spouse cust. for children</value></natureOfOwnership>
</ownershipNature></nonDerivativeHolding></nonDerivativeTable><derivativeTable><derivativeHolding><securityTitle><value>Stock Option</value></securityTitle><conversionOrExercisePrice><value>22.777</value></conversionOrExercisePrice><exerciseDate><value>2000-07-20</value><footnoteId id="F1"/></exerciseDate><expirationDate><value>2006-01-19</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>17067</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Stock Option</value></securityTitle><conversionOrExercisePrice><value>44.015</value></conversionOrExercisePrice><exerciseDate><value>2002-01-01</value><footnoteId id="F2"/></exerciseDate><expirationDate><value>2011-01-17</value></expirationDate><underl
yingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>213337</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding></derivativeTable><footnotes><footnote id="F1">The option vests in 5 equal installments, the 1st installment is exercisable on 7/20/00, the rest annually beginning 1/20/01.</footnote><footnote id="F2">The option vests in 5 equal annual installments beginning 1/01/02.</footnote></footnotes><remarks/><ownerSignature><signatureName>Peter Wu</signatureName><signatureDate>2003-10-30</signatureDate></ownerSignature></ownershipDocument>

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