VB Vanguard Small Cap

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-A

FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES

PURSUANT TO SECTION 12(b) OR (g) OF THE

SECURITIES EXCHANGE ACT OF 1934

VANGUARD INDEX FUNDS

(EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

Securities to be registered pursuant to Section 12(b) of the Act:

If this form relates to the registration of a class of securities pursuant to Section 12(b) of the Exchange Act and is effective pursuant to General Instruction A.(c), check the following box. x

If this form relates to the registration of a class of securities pursuant to Section 12(g) of the Exchange Act and is effective pursuant to General Instruction A.(d), check the following box. o

Securities Act registration statement file number to which this form relates: 2-56846

Securities to be registered pursuant to Section 12(g) of the Act: None

ITEM 1. DESCRIPTION OF REGISTRANT'S SECURITIES TO BE REGISTERED

Reference is made to the Registrant's Post-Effective Amendment Nos. 112 and 113, filed on April 29, 2008, to the Registration Statement on Form N-1A (Securities Act file number 2-56846 and Investment Company Act file number 811-2652, respectively (collectively, the "Registration Statement")), which is incorporated herein by reference.

ITEM 2. EXHIBITS

1.  Registrant's Amended and Restated Agreement and Declaration of Trust, incorporated herein by reference to Exhibit (a) to the Registration Statement.

3. Form of Global Certificate for the Registrant's Securities is filed herewith.

SIGNATURES

Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, the Registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereto duly authorized.