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[Pages:5]Vanguard Variable Insurance Funds--Diversified Value Portfolio

Supplement Dated February 25, 2022, to the Prospectus and Summary Prospectus Dated April 29, 2021

Important Changes to Vanguard Variable Insurance Funds--Diversified Value Portfolio

Effective immediately, Henry Ross Seiden has been added as a co-portfolio manager of Lazard Asset Management LLC's portion of Vanguard Variable Insurance Funds--Diversified Value Portfolio (the Portfolio). Additionally, the titles and all references thereto for current co-portfolio managers of Hotchkis and Wiley Capital Management, LLC's portion of the Portfolio, George H. Davis, Jr. and Scott McBride, are hereby updated to "Executive Chairman and Portfolio Manager" and "Chief Executive Officer and Portfolio Manager" respectively.

The Portfolio's investment objective, strategies, and policies remain unchanged.

Prospectus and Summary Prospectus Text Changes The following is added under the heading "Investment Advisors" in the Portfolio Summary section:

Henry Ross Seiden, Managing Director of Lazard. He has co-managed a portion of the Portfolio since February 2022.

Prospectus Text Changes The following is added under the heading "Investment Advisors" in the More on the Portfolio section:

Henry Ross Seiden, Managing Director of Lazard. He has worked in investment management since 2006, has been with Lazard since 2010, has managed investment portfolios since 2015, and has co-managed a portion of the Portfolio since February 2022. Education: B.B.A., University of Michigan.

? 2022 The Vanguard Group, Inc. All rights reserved. Vanguard Marketing Corporation, Distributor.

PS 278A 022022

Vanguard Variable Insurance Funds Diversified Value Portfolio

April 29, 2021 Prospectus

This prospectus contains financial data for the Portfolio through the fiscal year ended December 31, 2020. The Securities and Exchange Commission (SEC) has not approved or disapproved these securities or passed upon the adequacy of this prospectus. Any representation to the contrary is a criminal offense.

Contents

Portfolio Summary More on the Portfolio

The Portfolio and Vanguard Investment Advisors Taxes Share Price

1 Financial Highlights

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5 General Information

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11 Glossary of Investment Terms

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12

14

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Portfolio Summary

Investment Objective The Portfolio seeks to provide long-term capital appreciation and income.

Fees and Expenses The following table describes the fees and expenses you may pay if you buy, hold, and sell shares of the Portfolio. The expenses shown in the table and in the example that follows do not reflect additional fees and expenses associated with the annuity or life insurance program through which you invest. If those additional fees and expenses were included, overall expenses would be higher.

Annual Portfolio Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)

Management Fees 12b-1 Distribution Fee Other Expenses Total Annual Portfolio Operating Expenses

0.26% None 0.02% 0.28%

Example

The following example is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you were to invest $10,000 in the Portfolio's shares. This example assumes that the Portfolio provides a return of 5% each year and that total annual portfolio operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you were to redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

1 Year $29

3 Years $90

5 Years $157

10 Years $356

Portfolio Turnover

The Portfolio pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual portfolio operating expenses or in the previous expense example, reduce the Portfolio's performance. During the most recent fiscal year, the Portfolio's turnover rate was 34% of the average value of its portfolio.

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Principal Investment Strategies The Portfolio invests mainly in large- and mid-capitalization companies whose stocks are considered by an advisor to be undervalued. Undervalued stocks are generally those that are out of favor with investors and that the advisor believes are trading at prices that are below average in relation to measures such as earnings and book value. These stocks often have above-average dividend yields. The Portfolio uses multiple investment advisors. Each advisor independently selects and maintains a portfolio of common stocks for the Portfolio.

Principal Risks An investment in the Portfolio could lose money over short or long periods of time. You should expect the Portfolio's share price and total return to fluctuate within a wide range. The Portfolio is subject to the following risks, which could affect the Portfolio's performance:

? Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices.

? Investment style risk, which is the chance that returns from large- and midcapitalization value stocks will trail returns from the overall stock market. Largeand mid-cap value stocks each tend to go through cycles of doing better--or worse--than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years. Historically, mid-cap value stocks have been more volatile in price than large-cap value stocks. The stock prices of mid-size companies tend to experience greater volatility because, among other things, these companies tend to be more sensitive to changing economic conditions.

? Manager risk, which is the chance that poor security selection will cause the Portfolio to underperform relevant benchmarks or other funds with a similar investment objective.

An investment in the Portfolio is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Annual Total Returns The following bar chart and table are intended to help you understand the risks of investing in the Portfolio. The bar chart shows how the performance of the Portfolio has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Portfolio compare with those of relevant market indexes, which have investment characteristics similar to those of the Portfolio. The Portfolio's returns are net of its expenses but

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do not reflect additional fees and expenses that are deducted by the annuity or life insurance program through which you invest. If such fees and expenses were included in the calculation of the Portfolio's returns, the returns would be lower. Keep in mind that the Portfolio's past performance does not indicate how the Portfolio will perform in the future. Updated performance information is available on our website for Financial Advisors at advisors. or by calling Vanguard toll-free at 800-522-5555.

Annual Total Returns -- Diversified Value Portfolio

40% 30% 20% 10%

0% -10% -20%

2011 3.92

2012 16.50

2013 29.40

2014 9.83

2015

2016

2017

12.96 13.16 ?2.45

2018 ?9.12

2019

2020

25.70

11.78

During the periods shown in the bar chart, the highest and lowest returns for a calendar quarter were:

Highest Lowest

Total Return 19.06% -25.72%

Quarter June 30, 2020 March 31, 2020

Average Annual Total Returns for Periods Ended December 31, 2020

Diversified Value Portfolio Comparative Indexes (reflect no deduction for fees or expenses) Russell 1000 Value Index Dow Jones U.S. Total Stock Market Float Adjusted Index

1 Year 5 Years 11.78% 10.30%

2.80% 9.74% 20.79 15.36

10 Years 10.60%

10.50% 13.74

Investment Advisors Hotchkis and Wiley Capital Management, LLC (Hotchkis and Wiley)

Lazard Asset Management LLC (Lazard)

Portfolio Managers

George H. Davis, Jr., Chief Executive Officer of Hotchkis and Wiley. He has co-managed a portion of the Portfolio since 2019.

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Scott McBride, CFA, President and Portfolio Manager of Hotchkis and Wiley. He has co-managed a portion of the Portfolio since 2019. Andrew Lacey, Deputy Chairman of Lazard. He has co-managed a portion of the Portfolio since 2019. Ronald Temple, Managing Director of Lazard. He has co-managed a portion of the Portfolio since 2019. Tax Information The Portfolio normally distributes its net investment income and net realized capital gains, if any, to its shareholders, which are the insurance company separate accounts that sponsor your variable annuity or variable life insurance contract. The tax consequences to you of your investment in the Portfolio depend on the provisions of the annuity or life insurance contract through which you invest. For more information on taxes, please refer to the prospectus of the annuity or life insurance contract through which Portfolio shares are offered. Payments to Financial Intermediaries The Portfolio and its investment advisors do not pay financial intermediaries for sales of Portfolio shares.

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More on the Portfolio

This prospectus describes the principal risks you would face as an investor in

this Portfolio. It is important to keep in mind one of the main principles of

investing: generally, the higher the risk of losing money, the higher the potential

reward. The reverse, also, is generally true: the lower the risk, the lower the

potential reward. As you consider an investment in any mutual fund, you should

take into account your personal tolerance for fluctuations in the securities

markets. Look for this

symbol throughout the prospectus. It is used to

mark detailed information about the more significant risks that you would

confront as a Portfolio investor. To highlight terms and concepts important to

mutual fund investors, we have provided Plain Talk? explanations along the way.

Reading the prospectus will help you decide whether the Portfolio is the right

investment for you. We suggest that you keep this prospectus for

future reference.

A Note About Vanguard Variable Insurance Funds The Diversified Value Portfolio of Vanguard Variable Insurance Funds is a mutual fund used solely as an investment option for annuity or life insurance contracts offered by insurance companies. This means that you cannot purchase shares of the Portfolio directly, but only through a contract offered by an insurance company.

The Diversified Value Portfolio is separate from other Vanguard mutual funds, even when the Portfolio and a fund have the same investment objective and advisor. The Portfolio's investment performance will differ from the performance of other Vanguard funds because of differences in the securities held and because of administrative and insurance costs associated with the annuity or life insurance program through which you invest.

Plain Talk About Costs of Investing

Costs are an important consideration in choosing a mutual fund. That is because you, as a contract owner, pay a proportionate share of the costs of operating a fund and any transaction costs incurred when the fund buys or sells securities. These costs can erode a substantial portion of the gross income or the capital appreciation a fund achieves. Even seemingly small differences in expenses can, over time, have a dramatic effect on a fund's performance.

The following sections explain the principal investment strategies and policies that the Portfolio uses in pursuit of its investment objective. The board of trustees of Vanguard Variable Insurance Funds (the Board), which oversees the

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