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UNITED STATES

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): August 24, 2011

AVIAT NETWORKS, INC.

(Exact name of registrant as specified in its charter)

Address of principal executive offices: 5200 Great America Parkway, Santa Clara, CA 95054

Registrant’s telephone number, including area code: 408-567-7100

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:

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Item 2.02 Results of Operations and Financial Condition

Item 7.01 Regulation FD Disclosure

The information contained in this Current Report on Form 8-K , including the accompanying Exhibit 99.1, is being furnished pursuant to Item 2.02 and 7.01 of Form 8-K and shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section. The information contained in this Current Report on Form 8-K that is furnished under Item 2.02 and 7.01, including the accompanying Exhibit 99.1, shall not be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, whether made before or after the date hereof, except as shall be expressly set forth by specific reference in such a filing.

On August 24, 2011, Aviat Networks, Inc. (“Aviat Networks”) issued a press release announcing its results of operations and financial condition as of and for its fourth quarter of fiscal year 2011, which ended July 1, 2011 and guidance regarding expected revenue for its first quarter of fiscal 2012. The full text of the press release and related financial tables is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Use of Non-GAAP Measures and Comparative Financial Information

The press release and related financial tables include a discussion of non-GAAP financial measures, including non-GAAP net income or loss from continuing operations and net income or loss from continuing operations per basic and diluted share for the fourth quarter and fiscal 2011. A “non-GAAP financial measure” is generally defined as a numerical measure of a company’s historical or future performance that excludes or includes amounts, or is subject to adjustments, so as to be different from the most directly comparable measure calculated and presented in accordance with generally accepted accounting principles (“GAAP”). Each of such non-GAAP amounts was determined by excluding certain items including costs of product sales and services, amortization of purchased technology, research and development expenses, selling and administrative expenses, amortization of intangible assets, restructuring charges and provision for income taxes. Aviat Networks has included in its press release a reconciliation of non-GAAP financial measures disclosed in the press release to the most directly comparable GAAP financial measures.

Aviat Networks reports information in accordance with U.S. GAAP. Management of Aviat Networks monitors gross margin, income or loss from continuing operations and basic and diluted income or loss per share from continuing operations on a non-GAAP basis for planning and forecasting results in future periods, and may use these measures for some management compensation purposes. As such, historical non-GAAP combined information has been included in this press release for comparative purposes. As a result, management is presenting these non-GAAP measures in addition to results reported in accordance with GAAP to better communicate underlying operational and financial performance in each period. Management believes these non-GAAP measures provide information that is useful to investors in understanding period-over-period operating results separate and apart from items that may, or could, have a disproportionate positive or negative impact on results in any given period. Management also believes that these non-GAAP measures enhance the ability of an investor to analyze trends in Aviat Networks’ business and to better understand our performance.

Aviat Networks management does not, nor does it suggest that investors should consider such non-GAAP financial measures in isolation from, or as a substitute for, financial information prepared in accordance with GAAP. Aviat Networks presents such non-GAAP financial measures in reporting its financial results to provide investors with an additional tool to evaluate the Company’s financial performance.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

The following exhibit is furnished herewith:

99.1 Press Release, issued by Aviat Networks, Inc. on August 24, 2011.

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SIGNATURE

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.

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EXHIBIT INDEX