EXHIBIT 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement No. 033-59853 and No. 333-121104 on Forms S-8 of our report dated June 11, 2018, relating to the financial statements and supplemental schedule of Northrop Grumman Savings Plan, appearing in this Annual Report on Form 11-K of Northrop Grumman Savings Plan for the year ended December 31, 2017.

/s/ DELOITTE & TOUCHE LLP

McLean, Virginia

June 11, 2018