<SEC-DOCUMENT>0000932471-17-005755-index.html : 20171130
<SEC-HEADER>0000932471-17-005755.hdr.sgml : 20171130
<ACCEPTANCE-DATETIME>20171130091316
ACCESSION NUMBER:		0000932471-17-005755
CONFORMED SUBMISSION TYPE:	497
PUBLIC DOCUMENT COUNT:		4
FILED AS OF DATE:		20171130
DATE AS OF CHANGE:		20171130
EFFECTIVENESS DATE:		20171130

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			VANGUARD INDEX FUNDS
		CENTRAL INDEX KEY:			0000036405
		IRS NUMBER:				231999755
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		497
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	002-56846
		FILM NUMBER:		171230031

	BUSINESS ADDRESS:	
		STREET 1:		PO BOX 2600
		STREET 2:		V26
		CITY:			VALLEY FORGE
		STATE:			PA
		ZIP:			19482
		BUSINESS PHONE:		6106691000

	MAIL ADDRESS:	
		STREET 1:		PO BOX 2600
		STREET 2:		V26
		CITY:			VALLEY FORGE
		STATE:			PA
		ZIP:			19482

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	VANGUARD INDEX FUNDS/
		DATE OF NAME CHANGE:	20011121

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	VANGUARD INDEX TRUST
		DATE OF NAME CHANGE:	19920703

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FIRST INDEX INVESTMENT TRUST
		DATE OF NAME CHANGE:	19800904
<SERIES-AND-CLASSES-CONTRACTS-DATA>
<EXISTING-SERIES-AND-CLASSES-CONTRACTS>
<SERIES>
<OWNER-CIK>0000036405
<SERIES-ID>S000002839
<SERIES-NAME>Vanguard 500 Index Fund
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000007773
<CLASS-CONTRACT-NAME>Investor Shares
<CLASS-CONTRACT-TICKER-SYMBOL>VFINX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000007774
<CLASS-CONTRACT-NAME>Admiral Shares
<CLASS-CONTRACT-TICKER-SYMBOL>VFIAX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000092055
<CLASS-CONTRACT-NAME>ETF Shares
<CLASS-CONTRACT-TICKER-SYMBOL>VOO
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000170274
<CLASS-CONTRACT-NAME>Institutional Select Shares
<CLASS-CONTRACT-TICKER-SYMBOL>VFFSX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000179712
<CLASS-CONTRACT-NAME>Institutional Shares
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000179713
<CLASS-CONTRACT-NAME>Institutional Plus Shares
</CLASS-CONTRACT>
</SERIES>
<SERIES>
<OWNER-CIK>0000036405
<SERIES-ID>S000002844
<SERIES-NAME>Vanguard Mid-Cap Index Fund
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000007791
<CLASS-CONTRACT-NAME>Investor Shares
<CLASS-CONTRACT-TICKER-SYMBOL>VIMSX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000007792
<CLASS-CONTRACT-NAME>Admiral Shares
<CLASS-CONTRACT-TICKER-SYMBOL>VIMAX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000007793
<CLASS-CONTRACT-NAME>Institutional Shares
<CLASS-CONTRACT-TICKER-SYMBOL>VMCIX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000007794
<CLASS-CONTRACT-NAME>ETF Shares
<CLASS-CONTRACT-TICKER-SYMBOL>VO
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000096111
<CLASS-CONTRACT-NAME>Institutional Plus Shares
<CLASS-CONTRACT-TICKER-SYMBOL>VMCPX
</CLASS-CONTRACT>
</SERIES>
</EXISTING-SERIES-AND-CLASSES-CONTRACTS>
</SERIES-AND-CLASSES-CONTRACTS-DATA>
</SEC-HEADER>
<DOCUMENT>
<TYPE>497
<SEQUENCE>1
<FILENAME>indexfunds497e.htm
<DESCRIPTION>INDEX FUNDS SUPPLEMENT
<TEXT>
Document 1 - file: indexfunds497e.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>indexfunds497ex1x1.jpg
<TEXT>
Document 3 - file: indexfunds497ex1x1.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>indexfunds497ex2x1.jpg
<TEXT>
Document 4 - file: indexfunds497ex2x1.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>indexfunds497ex4x1.jpg
<TEXT>
Document 5 - file: indexfunds497ex4x1.jpg

</DOCUMENT>
</SEC-DOCUMENT>