Form 485BXT VANGUARD VARIABLE INSURA

Explanatory Note

This Post-Effective Amendment No. 77 under the Securities Act of 1933, as amended (the “Securities Act”) (Amendment No. 80 under the Investment Company Act of 1940, as amended (the “1940 Act”) to the registration statement on Form N-1A (the “Registration Statement”) of Vanguard Variable Insurance Funds (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 April 29, 2016, the pending effective date of the Trust’s 76^th Post-Effective Amendment. By way of further background:

• Post-Effective Amendment No. 76 was filed under Rule 485(a) on January 25, 2016, for the purpose of disclosing the addition of a new advisor, Arrowpoint Asset Management, LLC to the investment team for Vanguard Variable Insurance Fund Small Company Growth Portfolio, a series of the Trust, and to affect a number of non-material changes.

This Post-Effective Amendment No. 77 incorporates by reference the information contained in Parts A, B, and C of Post-Effective Amendment No. 76 to the Registration’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 13th day of April, 2016.

VANGUARD VARIABLE INSURANCE FUNDS

BY:_________/s/ F. William McNabb III*____________

F. William McNabb III
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:

*By: /s/ Heidi Stam

Heidi Stam, pursuant to a Power of Attorney filed on April 22, 2014, see File Number 2-17620, Incorporated by Reference.