Form 485BXT VANGUARD WORLD FUND

Explanatory Note

This Post-Effective Amendment No. 158 under the Securities Act of 1933, as amended (the “Securities Act”) (Amendment No. 158 under the Investment Company Act of 1940, as amended) to the registration statement on Form N-1A (the “Registration Statement”) of Vanguard World Fund (the “Trust”) is being filed pursuant to paragraph (b)(1)(iii) of Rule 485 under the Securities Act solely for the purpose of delaying, until December 11, 2018, the pending effective date of the Trust’s 150th Post-Effective Amendment. By way of further background:

• Post-Effective Amendment No. 157 was filed under Rule 485(b)(1)(iii) on October 12, 2018, for the sole purpose of extending to November 11, 2018, the then-pending effective date of Post-Effective Amendment No. 154.

• Post-Effective Amendment No. 154 was filed under Rule 485(b)(1)(iii) on September 14, 2018, for the sole purpose of extending to October 14, 2018, the then-pending effective date of Post-Effective Amendment No. 153.

• Post-Effective Amendment No. 153 was filed under Rule 485(b)(1)(iii) on August 17, 2018, for the sole purpose of extending to September 16, 2018, the then-pending effective date of Post-Effective Amendment No. 152.

• Post-Effective Amendment No. 152 was filed under Rule 485(b)(1)(iii) on July 20, 2018, for the sole purpose of extending to August 19, 2018, the then-pending effective date of Post-Effective Amendment No. 150.

• Post-Effective Amendment No. 150 was filed under Rule 485(a)(1) on May 2, 2018 for the purposes of: (1) changing the name of Vanguard Telecommunication Services Index Fund to Vanguard Communication Services Index Fund; (2) changing the benchmark index for Vanguard Telecommunication Services Index Fund; and (3) effecting a number of non-material editorial changes. Post-Effective Amendment No. 150 originally requested that the Amendment become effective on July 21, 2018, pursuant to the requirements of Rule 485(a)(1).

This Post-Effective Amendment No. 158 incorporates by reference the information contained in Parts A, B, and C of Post-Effective Amendment No. 150 to the Trust’s Registration Statement.

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 9th day of November, 2018.

VANGUARD WORLD FUND

BY:_______ /s/ Mortimer J. Buckley*

Mortimer J. Buckley
Chief Executive Officer, President, and Trustee

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

*By: /s/ Anne E. Robinson

Anne E. Robinson, pursuant to a Power of Attorney filed on January 18, 2018, see File Number 33-32216, Incorporated by Reference.