SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(D) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of Earliest Event Reported): February 7, 2012

FORRESTER RESEARCH, INC.

(Exact name of registrant as specified in its charter)

60 Acorn Park Drive

Cambridge, Massachusetts 02140

(Address of principal executive offices, including zip code)

(617) 613-6000

(Registrant’s telephone number, including area code)

N/A

(Former Name or Former Address, if Changes since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

The information contained in this current report on Form 8-K is furnished pursuant to Item 2.02 of Form 8-K “Results of Operations and Financial Condition”. This information and the exhibits hereto are being furnished and shall not be deemed to be “filed” for the purposes of Section 18 of, or otherwise regarded as filed under, the Securities Exchange Act of 1934, as amended. The information contained in this report shall not be incorporated by reference into any filing of Forrester Research, Inc. with the Securities and Exchange Commission, whether made before or after the date hereof, regardless of any general incorporation language in such filings.

On February 9, 2012, Forrester Research, Inc. issued a press release announcing its financial results for the quarter and year ended December 31, 2011.

Forrester believes that pro forma financial results provide investors with consistent and comparable information to aid in the understanding of Forrester’s ongoing business. Forrester uses pro forma financial information to manage its business, including use of pro forma financial results as the basis for setting targets for various compensation programs. Our pro forma presentation excludes the following, as well as their related tax effects:

Amortization of intangibles—we exclude the effect of the amortization of intangibles from our pro forma results in order to more consistently present our ongoing results of operations.

Gains and losses from investments—we have consistently excluded both gains and losses related to our investments in non-marketable securities and sales of marketable securities from our pro forma results in order to keep quarter-over-quarter and year-over-year comparisons consistent.

Stock-based compensation expense—we exclude stock-based compensation from our pro forma results in order to keep quarter-over-quarter and year-over-year comparisons consistent.

Reorganization costs associated with the Company’s January 2012 sales force realignment are not included in our pro forma results in order to keep quarter-over-quarter and year-over-year comparisons consistent.

Acquisition and integration related costs and credits are not included in our pro forma results in order to more consistently present our ongoing results of operations.

Duplicate lease costs represent costs for replacement facilities for the period of time prior to the Company utilizing the new facility for operations. Duplicate lease costs are excluded from our pro forma results in order to keep quarter-over-quarter and year-over-year comparisons consistent.

However, these measures should be considered in addition to, not as a substitute for, or superior to, operating income or other measures of financial performance prepared in accordance with generally accepted accounting principles as more fully discussed in our financial statements and filings with the Securities and Exchange Commission.

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On February 9, 2012, the Company also announced that its Board of Directors has approved a new quarterly dividend, with the first dividend payment of $0.14 per share to be paid on March 21, 2012 to shareholders of record on March 7, 2012. We intend to begin paying regular quarterly cash dividends; however, the actual declaration of any such future dividends, and the establishment of the per share amount and payment dates for any such future dividends are subject to the discretion of the Board of Directors.

The statement in this Item 8.01 relating to future quarterly dividends is a forward-looking statement within the meaning of the Private Securities Litigation Reform Act of 1995. This statement is based on Forrester’s current plans and expectations and involves risks and uncertainties that could cause this not to occur or to occur in a manner different from that stated herein. Important factors that could cause actual future activities and results to differ include, among others, Forrester’s ability to retain and enrich memberships for its research products and services, technology spending, Forrester’s ability to respond to business and economic conditions and market trends, the risks and challenges inherent in international business activities, competition and industry consolidation, the ability to attract and retain professional staff, Forrester’s dependence on key personnel, and possible variations in Forrester’s quarterly operating results. Forrester undertakes no obligation to update publicly any forward-looking statements, whether as a result of new information, future events, or otherwise. For further information, please refer to Forrester’s reports and filings with the Securities and Exchange Commission.

(d) Exhibits

99.1 Press Release dated February 9, 2012 with respect to financial results for the quarter and year ended December 31, 2011 and the approval of a quarterly cash dividend.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: February 9, 2012

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Exhibit Index

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