Consent of Independent Registered Public Accounting Firm

The Board of Directors

KBR, Inc.:

We consent to the incorporation by reference in the registration statement (Registration Nos. 333-228047, 333-190777, 333-155551, 333-138850, and 333-142101) on Form S-8 of KBR, Inc. of our reports dated February 25, 2021, with respect to the consolidated balance sheets of KBR, Inc. as of December 31, 2020 and 2019, the related consolidated statements of operations, comprehensive income (loss), shareholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2020, and the related notes and financial statement schedule II, (collectively, the “consolidated financial statements”), and the effectiveness of internal control over financial reporting as of December 31, 2020, which reports appear in the December 31, 2020 annual report on Form 10-K of KBR, Inc.

Our report dated February 25, 2021, on the effectiveness of internal control over financial reporting as of December 31, 2020, contains an explanatory paragraph stating that the Company acquired Centauri Platform Holdings LLC and Scientific Management Associates (Operations) Pty Ltd during 2020 and management excluded from its assessment of the effectiveness of the Company’s internal control over financial reporting as of December 31, 2020, these businesses’ internal control over financial reporting associated with total assets of $246 million and total revenues of $146 million included in the consolidated financial statements of the Company as of and for the year ended December 31, 2020. Our audit of internal control over financial reporting of the Company also excluded an evaluation of the internal control over financial reporting of these acquired businesses.

/s/ KPMG LLP

Houston, Texas

February 25, 2021