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

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

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

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

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

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.