Exhibit 21.1

LIST OF SUBSIDIARIES

KBR, INC.

Subsidiaries of Registrant as of December 31, 2022

NAME OF COMPANY						COUNTRY OF INCORPORATION
Affinity Capital Works Limited						United Kingdom
Affinity Flying Services Limited						United Kingdom
Affinity Flying Training Services Limited						United Kingdom
Alcyon Technical Services (ATS) JV, LLC						United States
AOC International Limited						United Kingdom
AOC Nigeria Limited						Nigeria
Asesoria Gerencial de Recursos Humanos, S. de R.L. de C. V.						Mexico
Aspire Defence Capital Works JV						United Kingdom
Aspire Defence Finance PLC						United Kingdom
Aspire Defence Holdings Limited						United Kingdom
Aspire Defence Limited						United Kingdom
Aspire Defence Services JV						United Kingdom
Aspire Defence Services Limited						United Kingdom
Åström Logistics AB						Sweden
B7JV (Nigeria) Limited						Nigeria
B7JV (UK) Limited.						United Kingdom
BE&K de Mexico, S.A. de C.V.						Mexico
BE&K, Inc.						United States
BE&KGIFFELS						United States
BetterKonnected Joint Venture						Australia
Bonny 7 Project Management Company Limited						United Kingdom
Bonny 7 Project Nigeria Limited						Nigeria
Bristol Management Centre Limited						United Kingdom
Brown & Root Highlands Fabricators Limited						United Kingdom
Brown & Root Industrial Services Canada Corporation						Canada
Brown & Root Industrial Services De Mexico						Mexico
Brown & Root Industrial Services Holdings, LLC						United States
Brown & Root Industrial Services Puerto Rico C.R.L.						Puerto Rico
Brown & Root Industrial Services, LLC						United States
Catalyst Systems & Training Solutions Pty Ltd						Australia
CCC Cayman, Ltd.						Cayman Islands

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NAME OF COMPANY						COUNTRY OF INCORPORATION
Covalent Vision LLC						United States
Dependable Global Solutions, LLC						United States
Eitec LTD						United Kingdom
Fasttrax Holdings Limited						United Kingdom
Fasttrax Limited						United Kingdom
Frazer-Nash Australia PTY LTD						Australia
Frazer-Nash Consultancy Limited						United Kingdom
Frazer-Nash Consultancy LLC						United States
FTX Logistics Limited						United Kingdom
Granherne Limited						United Kingdom
Harmonic Consulting Limited						United Kingdom
Harmonic Limited						United Kingdom
Howard Humphreys & Partners Limited						United Kingdom
Howard Humphreys (Kenya) Limited						Kenya
Insulation Material Distributors, LLC						United States
Jazan						Saudi Arabia
JGC-KBR Venture (In Salah Project)						Cayman Islands
KBR-Aurecon Joint Venture						Australia
KBR (Aspire Construction Ventures) Holdings Ltd						United Kingdom
KBR (Aspire Construction Ventures) Holdings No 2 Ltd						United Kingdom
KBR (Aspire Construction Ventures) Ltd						United Kingdom
KBR (Aspire Construction) Holdings Limited						United Kingdom
KBR (Aspire Construction) Holdings No.2 Limited						United Kingdom
KBR (Aspire Construction) Limited						United Kingdom
KBR (Aspire Services Ventures) Holdings Ltd						United Kingdom
KBR (Aspire Services Ventures) Holdings No.2 Ltd						United Kingdom
KBR (Aspire Services Ventures) Ltd						United Kingdom
KBR (Aspire Services) Holdings Limited						United Kingdom
KBR (Aspire Services) Holdings No.2 Limited						United Kingdom
KBR (Aspire Services) Limited						United Kingdom
KBR (I) Limited						United Kingdom
KBR (U.K.) Investments Limited						United Kingdom
KBR Abr al Bihar General Services, Trade and General Contracting, LLC						Iraq
KBR Al-Yusr Limited Company						Saudi Arabia
KBR and Arup Joint Venture						Australia
KBR Arabia Limited						Saudi Arabia
KBR Australia Pty Ltd						Australia
KBR Canada Ltd						Canada

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NAME OF COMPANY						COUNTRY OF INCORPORATION
KBR Charitable Foundation, Inc.						United States
KBR Construction Company, LLC						United States
KBR E&C Australia Pty Ltd						Australia
						Western Australia
KBR Ecoplanning Oy						Finland
KBR Employment Services Limited						United Kingdom
KBR Engineering Company, LLC						United States
KBR Engineering of North Carolina, Inc.						United States
KBR for Consultancy and Project Management WLL						Kuwait
KBR General Partner Limited						United Kingdom
KBR Gerenciamento de Projectos e Servicos de Estudos Industriais Conceituais Basicos E De.						Brazil
KBR Group Holdings, LLC						United States
KBR Gulf Services Solutions W.L.L.						Qatar
KBR Holdings Pty Ltd						Australia
KBR Holdings, LLC						United States
KBR Industrial Canada Co.						Canada
KBR Investments Limited						United Kingdom
KBR Jacobs JV (Kingsford Smith Drive Upgrade Project)						Australia
KBR Jersey Limited						Jersey
KBR Monterrey S.A. de C.V.						Mexico
KBR Oil and Gas Services Limited						Nigeria
KBR Overseas, Inc.						United States
KBR PNG Limited						Papua New Guinea
KBR Poland Spolka z.o.o.						Poland
KBR Property Holdings LP						United Kingdom
KBR Services, LLC						United States
KBR Services, S.A.R.L.						Djibouti
KBR SMEC Mott MacDonald Design JV (KMS JV) (North West Rail Link (NWRL))						Australia
KBR Technical Services, Inc.						United States
KBR USA LLC						United States
KBR WABI LTD.						Canada
KBR Wyle Services, LLC						United States
KBR, Inc.						United States
KBR/JGC Joint Venture (Natural Gas Alliance Agreement)						United States
KBR-Aurecon JV-SA Water						Australia
KBR-Aurecon JV-Water Sec						Australia
KBR-Aurecon Yarra Valley Water						Australia
KBR-NIPI Limited Liability Partnership						Kazakhstan

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NAME OF COMPANY						COUNTRY OF INCORPORATION
KBS Maritime Limited						United Kingdom
Kellogg (Malaysia) Sdn. Bhd.						Malaysia
Kellogg Brown & Root (Greenford) Limited						United Kingdom
Kellogg Brown & Root (Norway) AS						Norway
Kellogg Brown & Root (Services) Limited						United Kingdom
Kellogg Brown & Root (U.K.) Limited						United Kingdom
Kellogg Brown & Root Asia Pacific Pte Ltd						Singapore
Kellogg Brown & Root Consultancy (Malaysia) Sdn Bhd						Malaysia
Kellogg Brown & Root Engineering & Construction India Private Limited						India
Kellogg Brown & Root Engineering Consultancy LLC						Oman
Kellogg Brown & Root Engineering Corporation						United States
Kellogg Brown & Root Eurasia Limited						Russian Federation
Kellogg Brown & Root GmbH						Germany
Kellogg Brown & Root Group Limited						United Kingdom
Kellogg Brown & Root Healthcare Trustee Limited						United Kingdom
Kellogg Brown & Root Holding B.V.						Netherlands
Kellogg Brown & Root Holdings (U.K.) Limited						United Kingdom
Kellogg Brown & Root Holdings Limited						United Kingdom
Kellogg Brown & Root International (MWK) Limited						United Kingdom
Kellogg Brown & Root International Group Limited						United Kingdom
Kellogg Brown & Root International, Inc.						United States
Kellogg Brown & Root International, Inc.						Panama
Kellogg Brown & Root Investment Holdings Limited						United Kingdom
Kellogg Brown & Root Limited						United Kingdom
Kellogg Brown & Root Limited-Azmi Abdullatif Abdulhadi and Abdullah Mahana Al-Moiabed Professional Company						Saudi Arabia
Kellogg Brown & Root LLC						United States
Kellogg Brown & Root Nigeria Limited						Nigeria
Kellogg Brown & Root Overseas Limited						United Kingdom
Kellogg Brown & Root Overseas Projects Limited						United Kingdom
Kellogg Brown & Root Projects Limited						United Kingdom
Kellogg Brown & Root Pty Ltd						Australia
Kellogg Brown & Root Pty Ltd - North West Program Alliance						Australia
Kellogg Brown & Root Pty Ltd - WaterSecure						Australia
Kellogg Brown & Root Saudi Ltd. Co.						Saudi Arabia
Kellogg Brown & Root Services B.V.						Netherlands
Kellogg Brown & Root Services International, Inc.						United States
Kellogg Brown & Root Services LLC						Oman

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NAME OF COMPANY						COUNTRY OF INCORPORATION
Kellogg Brown & Root Sustainable Technology Solutions Limited						United Kingdom
Kellogg Brown & Root Technology (Beijing) Co. Ltd						China
Kellogg Brown & Root Trustees Limited						United Kingdom
Kellogg Energy Services Nigeria Limited						Nigeria
Kellogg France, S.A.						France
Kellogg Joint Venture - Gorgon Pjt						Australia
Labor Support Services Limited						Cayman Islands
Laurel Financial Services B.V.						Netherlands
Mangrove Gas Netherlands B.V.						Netherlands
Mantenimiento Marino de Mexico, S. de R.L. de C.V.						Mexico
MMM-SS Holdings, LLC						United States
Overseas Supply Services Limited						United Kingdom
Plinke GmbH						Germany
PT KBR Indonesia						Indonesia
PT Roberts Schaefer Soros Indonesia						Indonesia
R and S Engineering (India) Private Limited						India
Semi Sub Services B.V.						Netherlands
Servicios Tecnicos Brown & Root, S.A.						Panama
Shepparton Corridor Upgrade Alliance						Australia
Sigma Bravo Pty Ltd						Australia
Southern Gas Constructors Limited						Nigeria
Systra- KBR Joint Venture						Australia
Technical Staffing Resources Limited						United Kingdom
Technical Staffing Resources, LLC						United States
TSKJ II Construcoes Internacionais Sociedade Unipessoal Limitada						Portugal
VIMA Bristol Limited						United Kingdom
VIMA Consultancy Limited						United Kingdom
VIMA Group Consultancy Limited						United Kingdom
VIMA Group  Holdings  Limited						United Kingdom
VIMA Group Services Limited						United Kingdom
Vinnell Brown & Root LLC						United States
Worthington-Simpson Limited						United Kingdom
Wyle Inc.						United States
Wyle Laboratories GmbH						Germany
ZAO KBR East						Russia

*    KBR, Inc. maintains over 100 subsidiaries. Set forth above are the names of certain controlled subsidiaries, at least 50% owned, directly or indirectly, of KBR, Inc. as of December 31, 2022. The names of certain subsidiaries have been omitted

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from this Exhibit 21.1 in accordance with applicable rules. The omitted subsidiaries, considered in the aggregate as a single subsidiary, did not constitute a “significant subsidiary” (as defined in Rule 1-02(w) of Regulation S-X) at December 31, 2022.