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)

February 1, 2012

Northrop Grumman Corporation

(Exact name of registrant as specified in its charter)

2980 Fairview Park Drive, Falls Church, VA 22042

(Address of principal executive offices)(Zip Code)

(703) 280-2900

Registrant’s telephone number, including area code

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:

¨    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨    Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

ITEM 2.02. RESULTS OF OPERATIONS AND FINANCIAL CONDITION.

On February 1, 2012, Northrop Grumman Corporation issued a press release announcing its financial results for the quarter and year ended December 31, 2011, under the heading “Northrop Grumman Reports Strong Fourth Quarter and 2011 Financial Results.” The press release is furnished as Exhibit 99.

ITEM 9.01. FINANCIAL STATEMENTS AND EXHIBITS.

Signature(s)

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.

Exhibit Index