-----BEGIN PRIVACY-ENHANCED MESSAGE-----
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,
 FGAcYVXFscwSlhYM95Bsdch3K1A3qcXHJXBlAgaZAAxVxQcJIpeA4ck4orbfwu2T
 sbumgfAJPDDTz3lJrCYgtw==

<SEC-DOCUMENT>0001185630-03-000002.txt : 20030828
<SEC-HEADER>0001185630-03-000002.hdr.sgml : 20030828
<ACCEPTANCE-DATETIME>20030828144553
ACCESSION NUMBER:		0001185630-03-000002
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030827
FILED AS OF DATE:		20030828

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			FAT WING K
		CENTRAL INDEX KEY:			0001185630

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-18630
		FILM NUMBER:		03870728

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

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>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType><periodOfReport>2003-08-27</periodOfReport>
    <issuer>
        <issuerCik>0000861842</issuerCik>
        <issuerName>CATHAY BANCORP INC</issuerName>
        <issuerTradingSymbol>CATY</issuerTradingSymbol></issuer><reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001185630</rptOwnerCik>
            <rptOwnerName>FAT WING K</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>0</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther></reportingOwnerRelationship></reportingOwner><nonDerivativeTable><nonDerivativeTransaction><securityTitle><value>Common Stock</value></securityTitle><transactionDate><value>2003-08-27</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>G</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>100</value></transactionShares><transactionPricePerShare><value>0</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>900</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></non
DerivativeTransaction><nonDerivativeHolding><securityTitle><value>Common Stock</value></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>127744</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>Family Trust</value></natureOfOwnership></ownershipNature></nonDerivativeHolding><nonDerivativeHolding><securityTitle><value>Common Stock</value></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>132262</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>President of Frank Fat Inc.</value></natureOfOwnership></ownershipNature></nonDerivativeHolding><nonDerivativeHolding><securityTitle><value>Common Stock</value></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>10030</value></sha
resOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>Vice President of Frank Fat Properties</value></natureOfOwnership></ownershipNature></nonDerivativeHolding></nonDerivativeTable><derivativeTable><derivativeHolding><securityTitle><value>NQ Stock Option</value></securityTitle><conversionOrExercisePrice><value>16.50</value></conversionOrExercisePrice><exerciseDate><value>2002-09-17</value><footnoteId id="F1"/></exerciseDate><expirationDate><value>2008-09-17</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>400</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>400</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfO
wnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>NQ Stock Option</value></securityTitle><conversionOrExercisePrice><value>21.25</value></conversionOrExercisePrice><exerciseDate><value>2003-01-20</value><footnoteId id="F2"/></exerciseDate><expirationDate><value>2010-01-20</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>600</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>1000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>NQ Stock Option</value></securityTitle><conversionOrExercisePrice><value>30.095</value></conversionOrExercisePrice><exerc
iseDate><value>2002-01-18</value><footnoteId id="F3"/></exerciseDate><expirationDate><value>2011-01-18</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>1000</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>2000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>NQ Stock Option</value></securityTitle><conversionOrExercisePrice><value>32.55</value></conversionOrExercisePrice><exerciseDate><value>2003-02-21</value><footnoteId id="F4"/></exerciseDate><expirationDate><value>2012-02-21</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlying
SecurityShares><value>1000</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>3000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>NQ Stock Option</value></securityTitle><conversionOrExercisePrice><value>39.85</value></conversionOrExercisePrice><exerciseDate><value>2004-01-16</value><footnoteId id="F5"/></exerciseDate><expirationDate><value>2013-01-16</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>1900</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>4900</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><d
irectOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding></derivativeTable><footnotes><footnote id="F1">The option vests in 2 equal annual installments beginning 09/17/2002.</footnote><footnote id="F2">The option vests in 3 equal annual installments beginning 01/20/2003.</footnote><footnote id="F3">The option vests in 5 equal annual installments beginning 01/18/2002.</footnote><footnote id="F4">The option vests in 5 equal annual installments beginning 02/21/2003.</footnote><footnote id="F5">The option vests in 5 equal annual installments beginning 01/16/2004.</footnote></footnotes><remarks/><ownerSignature><signatureName>Wing K. Fat</signatureName><signatureDate>2003-08-28</signatureDate></ownerSignature></ownershipDocument>

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</DOCUMENT>
</SEC-DOCUMENT>
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