Vanguard Mid-Cap Growth Index Fund (VMGMX) EFFECT Notice of effectiveness

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Notice of Effectiveness
Effectiveness Date:	December 13, 2010

Accession Number:

0000932471-10-003580

Submission Type:

485APOS

CIK:

0000036405

Company Name:

VANGUARD INDEX FUNDS

File Number:

002-56846

REFERENCED SERIES/CLASSES (CONTRACTS)

Series ID
	Class/Contract	Name
S000002841		Vanguard Extended Market Index Fund
	C000007781	Institutional Shares
	C000096110	Institutional Plus Shares

Series ID
	Class/Contract	Name
S000002844		Vanguard Mid-Cap Index Fund
	C000007793	Institutional Shares
	C000096111	Institutional Plus Shares

Series ID
	Class/Contract	Name
S000002845		Vanguard Small-Cap Index Fund
	C000007797	Institutional Shares
	C000096112	Institutional Plus Shares

Series ID
	Class/Contract	Name
S000002846		Vanguard Small-Cap Growth Index Fund
	C000007800	Institutional Shares

Series ID
	Class/Contract	Name
S000002847		Vanguard Small-Cap Value Index Fund
	C000007803	Institutional Shares