VB Vanguard Small Cap

SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT (NO. 2-56846) UNDER THE
SECURITIES ACT OF 1933

PRE-EFFECTIVE AMENDMENT NO.
POST-EFFECTIVE AMENDMENT NO. 113
AND

REGISTRATION STATEMENT UNDER THE
INVESTMENT COMPANY ACT OF 1940

AMENDMENT NO. 114

VANGUARD INDEX FUNDS
(EXACT NAME OF REGISTRANT AS SPECIFIED IN DECLARATION OF TRUST)

P.O. BOX 2600, VALLEY FORGE, PA 19482 (ADDRESS OF PRINCIPAL
EXECUTIVE OFFICE)

REGISTRANT'S TELEPHONE NUMBER (610) 669-1000

HEIDI STAM, ESQUIRE
P.O. BOX 876
VALLEY FORGE, PA 19482

IT IS PROPOSED THAT THIS AMENDMENT BECOME EFFECTIVE ON
MAY 30, 2008 PURSUANT TO PARAGRAPH (B) OF RULE 485.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant hereby certifies that it meets all requirements for effectiveness of this Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the Town of Valley Forge and the Commonwealth of Pennsylvania, on the 30th day of May, 2008.

VANGUARD INDEX FUNDS

BY:_____________(signature)________________

(HEIDI STAM)

JOHN J. BRENNAN*
CHAIRMAN AND CHIEF EXECUTIVE OFFICER

Pursuant to the requirements of the Securities Act of 1933, this Post-Effective Amendment to the Registration Statement has been signed below by the following persons in the capacities and on the date indicated:

 SIGNATURE TITLE DATE
 --------------------------------------------------------------------------------


By: /S/ JOHN J. BRENNAN President, Chairman, Chief May 30, 2008
 ------------------------------ Executive Officer, and Trustee
 (Heidi Stam)
 John J. Brennan*

By: /S/ CHARLES D. ELLIS Trustee May 30, 2008
 ------------------------------
 (Heidi Stam)
 Charles D. Ellis*

By: /S/ EMERSON U. FULLWOOD Trustee May 30, 2008
 ----------------------------
 (Heidi Stam)
 Emerson U. Fullwood*

By: /S/ RAJIV L. GUPTA Trustee May 30, 2008
 ------------------------------
 (Heidi Stam)
 Rajiv L. Gupta*

By: /S/ AMY GUTMANN Trustee May 30, 2008
 ------------------------------
 (Heidi Stam)
 Amy Gutmann*

By: /S/ JOANN HEFFERNAN HEISEN Trustee May 30, 2008
 ------------------------------
 (Heidi Stam)
 JoAnn Heffernan Heisen*

By: /S/ ANDRE F. PEROLD Trustee May 30, 2008
 ------------------------------
 (Heidi Stam)
 Andre F. Perold*

By: /S/ ALFRED M. RANKIN, JR. Trustee May 30, 2008
 ------------------------------
 (Heidi Stam)
 Alfred M. Rankin, Jr.*

By: /S/ J. LAWRENCE WILSON Trustee May 30, 2008
 ------------------------------
 (Heidi Stam)
 J. Lawrence Wilson*

By: /S/ THOMAS J. HIGGINS Treasurer and Principal May 30, 2008
 ------------------------------ Financial Officer and
 (Heidi Stam) Principal Accounting Officer
 Thomas J. Higgins*

* By Power of Attorney. Filed on January 18, 2008, see File Number 2-29601.
Incorporated by Reference.

Users of this data are advised pursuant to the rules and regulations governing the filing of voluntary XBRL disclosure that the following XBRL documents are not the official publicly filed disclosure of The Vanguard Group. The purpose of submitting these XBRL formatted documents is to test the related format and technology and, as a result, investors should continue to rely on the official version of the furnished documents and not rely on this information in making investment decisions.

EXHIBIT INDEX

XBRL Instance Document . . . . . . . . . . . . . . . . . . . . . . Ex-100.INS

XBRL Taxonomy Extension Schema Document . . . . . . . . . . . . . . Ex-100.SCH

XBRL Taxonomy Extension Definition Linkbase Document . . . . . . . Ex-100.DEF

XBRL Taxonomy Extension Labels Linkbase Document . . . . . . . . . Ex-100.LAB

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