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 WORLD FUNDS
(EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER) 

STATE OF DELAWARE                             SEE BELOW
-------------------------                     ---------------------------
(STATE OF INCORPORATION OF ORGANIZATION)      (IRS EMPLOYER
                                              IDENTIFICATION NO.)

C/O     VANGUARD WORLD FUNDS
        P.O. BOX 2600 19482
        VALLEY FORGE, PA (ZIP CODE)
--------------------------
(ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)

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

Title of each class to be registered:    Exchange          I.R.S. Employer
                                                           Identification Number
Vanguard Extended Duration        American Stock Exchange  26-0440016
   Treasury ETF

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. [ ]

Securities Act registration statement file number to which this form relates: 2-17620

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. 104 and 104 to the Registration Statement on Form N-1A (Securities Act file number 2-17620 and Investment Company Act file number 811-01027, respectively (collectively, the "Registration Statement")), which is incorporated herein by reference.

ITEM 2. EXHIBITS

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

2. Registrant's Amended and Restated By-Laws, incorporated herein by reference to Exhibit (b) 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.

VANGUARD WORLD FUNDS 

DATE: October 22, 2007                       By: /s/ Heidi Stam
                                                     -------------------
                                                     Heidi Stam
                                                     Secretary

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