<SEC-DOCUMENT>0001179110-17-012484.txt : 20170920
<SEC-HEADER>0001179110-17-012484.hdr.sgml : 20170920
<ACCEPTANCE-DATETIME>20170920145704
ACCESSION NUMBER:		0001179110-17-012484
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20170918
FILED AS OF DATE:		20170920
DATE AS OF CHANGE:		20170920

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SANCHEZ ANTONIO R JR
		CENTRAL INDEX KEY:			0001060529

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-09439
		FILM NUMBER:		171093924

	MAIL ADDRESS:	
		STREET 1:		1000 MAIN STREET
		STREET 2:		SUITE 3000
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77002

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			INTERNATIONAL BANCSHARES CORP
		CENTRAL INDEX KEY:			0000315709
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		IRS NUMBER:				742157138
		STATE OF INCORPORATION:			TX
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		12OO SAN BERNARDO AVE
		STREET 2:		PO BOX 1359
		CITY:			LAREDO
		STATE:			TX
		ZIP:			78040-1359
		BUSINESS PHONE:		9567227611

	MAIL ADDRESS:	
		STREET 1:		P O BOX 1359
		STREET 2:		1200 SAN BERNARDO
		CITY:			LAREDO
		STATE:			TX
		ZIP:			78040
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 4/A -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2017-09-18</periodOfReport>

    <dateOfOriginalSubmission>2017-09-19</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000315709</issuerCik>
        <issuerName>INTERNATIONAL BANCSHARES CORP</issuerName>
        <issuerTradingSymbol>IBOC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001060529</rptOwnerCik>
            <rptOwnerName>SANCHEZ ANTONIO R JR</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>P.O. BOX 2986</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>LAREDO</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>78044</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>COMMON STOCK</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1067439</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>HELD IN PARTNERSHIP</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">The reporting person disclaims beneficial ownership of the reported securities except to the extent of the pecuniary interest therein, if any.</footnote>
        <footnote id="F2">This amendment is being made to reflect the fact that Mr. Sanchez owns the 1,067,439 shares previously reported indirectly in partnership rather than directly, as was originally reported.  No other changes have been made to the original filing.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/S/ANTONIO R. SANCHEZ JR.</signatureName>
        <signatureDate>2017-09-19</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
