Exhibit 21.1

LIST OF SUBSIDIARIES

KBR, INC.

Subsidiaries of Registrant as of December 31, 2021

NAME OF COMPANY	STATE OR 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	Alabama
AOC International Limited	Scotland
AOC Nigeria Limited	Nigeria
Asesoria Gerencial de Recursos Humanos, S. de R.L. de C. V.	Mexico
Aspire Defence Capital Works JV	England & Wales
Aspire Defence Finance PLC	England & Wales
Aspire Defence Limited	England & Wales
Aspire Defence Services JV	United Kingdom
Aspire Defence Services Limited	England & Wales
Åström Logistics AB	Sweden
BE&K de Mexico, S.A. de C.V.	Mexico
BE&K, Inc.	Delaware
BE&KGIFFELS	Alabama
BetterKonnected Joint Venture	Australia
Bonny 7 Project Management Company Limited	England & Wales
Bonny 7 Project Nigeria Limited	Nigeria
Brown & Root CIVMEC PTY LTD	Australia
Brown & Root Highlands Fabricators Limited	Scotland
Brown & Root Industrial Services Canada Corporation	Alberta
Brown & Root Industrial Services De Mexico	Mexico
Brown & Root Industrial Services Holdings, LLC	Delaware
Brown & Root Industrial Services Puerto Rico C.R.L.	Puerto Rico
Brown & Root Industrial Services, LLC	Delaware
Brown & Root/Espey Padden (Waller Creek Tunnel)	Texas
Catalyst Systems & Training Solutions Pty Ltd	Australian Capital Territory
CCC Cayman, Ltd.	Cayman Islands
Covalent Vision LLC	Delaware
Charville - Consultores E Servicos LDA	Portugal

NAME OF COMPANY	STATE OR COUNTRY OF INCORPORATION
Dependable Global Solutions, LLC	Virginia
Dresser-Cullen Venture	Texas
Energo Engineering Services, LLC	Texas
Fasttrax Holdings Limited	England & Wales
Fasttrax Limited	England & Wales
FNC Limited	England & Wales
Frazer-Nash Consultancy (Australia) PTY LTD	Australia
Frazer-Nash Consultancy Limited	England & Wales
Frazer-Nash Consultancy LLC	Delaware
FTX Logistics Limited	England & Wales
Global Project Services Ltd.	Cayman Islands
Granherne International (Holdings) Limited	England & Wales
Granherne Limited	England & Wales
Granherne Pty Ltd	Australia
Granherne, Inc.	Texas
Harmonic Limited	England & Wales
Howard Humphreys & Partners Limited	England & Wales
Howard Humphreys (Kenya) Limited	Kenya
Insulation Material Distributors, LLC	Delaware
IPEM Developments Limited	England & Wales
Jazan	Saudi Arabia
JGC-KBR Venture (In Salah Project)	Cayman Islands
KBR - Aurecon Joint Venture	Australia
KBR (Aspire Construction Ventures) Holdings Ltd	England & Wales
KBR (Aspire Construction Ventures) Holdings No 2 Ltd	England & Wales
KBR (Aspire Construction Ventures) Ltd	England & Wales
KBR (Aspire Construction) Holdings Limited	England & Wales
KBR (Aspire Construction) Holdings No.2 Limited	England & Wales
KBR (Aspire Construction) Limited	England & Wales
KBR (Aspire Services Ventures) Holdings Ltd	England & Wales
KBR (Aspire Services Ventures) Holdings No.2 Ltd	England & Wales
KBR (Aspire Services Ventures) Ltd	England & Wales
KBR (Aspire Services) Holdings Limited	England & Wales
KBR (Aspire Services) Holdings No.2 Limited	England & Wales
KBR (Aspire Services) Limited	England & Wales
KBR (I) Limited	England & Wales
KBR (U.K.) Investments Limited	England & Wales
KBR Abr al Bihar General Services, Trade and General Contracting, LLC	Iraq

NAME OF COMPANY	STATE OR COUNTRY OF INCORPORATION
KBR Al-Yusr Limited Company	Saudi Arabia
KBR and Arup Joint Venture	Australia
KBR Arabia Limited	Saudi Arabia
KBR Australia Pty Ltd	Western Australia
KBR Canada Ltd	Saskatchewan
KBR Charitable Foundation, Inc.	Delaware
KBR Construction Company, LLC	Delaware
KBR Construction Limited	England & Wales
KBR E&C Australia Pty Ltd	Western Australia
	Western Australia
KBR Ecoplanning Oy	Finland
KBR Emerging Growth Corp. I	Cayman Islands
KBR Employment Services Limited	England & Wales
KBR Engineering Company, LLC	Delaware
KBR General Partner Limited	Scotland
KBR Gerenciamento de Projectos e Servicos de Estudos Industriais Conceituais Basicos E De.	Rio de Janeiro
KBR Group Holdings, LLC	Delaware
KBR Holdings Pty Ltd	Western Australia
KBR Holdings, LLC	Delaware
KBR Industrial Canada Co.	Nova Scotia
KBR Investments Limited	England & Wales
KBR Jacobs JV (Kingsford Smith Drive Upgrade Project)	Australia
KBR Jersey Limited	Jersey Island
KBR Monterrey S.A. de C.V.	Nuevo Leon
KBR Oil and Gas Services Limited	Nigeria
KBR Overseas, Inc.	Delaware
KBR PNG Limited	Papua New Guinea
KBR Poland Spolka z.o.o.	Poland
KBR Property Holdings LP	England & Wales
KBR Services, LLC	Delaware
KBR Services, S.A.R.L.	Djibouti
KBR Sponsor LLC	Delaware
KBR Technical Services, Inc.	Delaware
KBR USA LLC	Delaware
KBR WABI LTD.	Alberta
KBR Wyle Services, LLC	Delaware
KBR/JGC Joint Venture	Texas
KBR-Aurecon JV-SA Water	Australia

NAME OF COMPANY	STATE OR COUNTRY OF INCORPORATION
KBR-Aurecon Yarra Valley Water	New South Wales
KBR-NIPI Limited Liability Partnership	Kazakhstan
KBS Maritime Limited	England & Wales
Kellogg (Malaysia) Sdn. Bhd.	Malaysia
Kellogg Brown & Root (Greenford) Limited	England & Wales
Kellogg Brown & Root (Norway) AS	Norway
Kellogg Brown & Root (Services) Limited	England & Wales
Kellogg Brown & Root (U.K.) Limited	England & Wales
Kellogg Brown & Root Asia Pacific Pte Ltd	Singapore
Kellogg Brown & Root Consultancy (Malaysia) Sdn Bhd	Malaysia
Kellogg Brown & Root DH Limited	England & Wales
Kellogg Brown & Root Energy Services Limited	England & Wales
Kellogg Brown & Root Engineering & Construction India Private Limited	India
Kellogg Brown & Root Engineering Consultancy LLC	Oman
Kellogg Brown & Root Engineering Corporation	New York
Kellogg Brown & Root Eurasia Limited	Russian Federation
Kellogg Brown & Root Financial Services B.V.	Netherlands
Kellogg Brown & Root GmbH	Germany
Kellogg Brown & Root Group Limited	England & Wales
Kellogg Brown & Root Healthcare Trustee Limited	United Kingdom
Kellogg Brown & Root Holding B.V.	Netherlands
Kellogg Brown & Root Holdings (U.K.) Limited	England & Wales
Kellogg Brown & Root Holdings Limited	England & Wales
Kellogg Brown & Root International (MWK) Limited	England & Wales
Kellogg Brown & Root International Group Limited	England & Wales
Kellogg Brown & Root International, Inc.	Panama
Kellogg Brown & Root Investment Holdings Limited	England & Wales
Kellogg Brown & Root Limited	England & Wales
Kellogg Brown & Root Limited-Azmi Abdullatif Abdulhadi and Abdullah Mahana Al-Moiabed Consulting Engineering Professional Partnership	Al Khobar
Kellogg Brown & Root LLC	Delaware
Kellogg Brown & Root London Holdings Limited	England & Wales
Kellogg Brown & Root London Limited	England & Wales
Kellogg Brown & Root Nigeria Limited	Nigeria
Kellogg Brown & Root Overseas Limited	England & Wales
Kellogg Brown & Root Overseas Operations Limited	England & Wales
Kellogg Brown & Root Overseas Projects Limited	England & Wales
Kellogg Brown & Root Projects Limited	England & Wales

NAME OF COMPANY	STATE OR COUNTRY OF INCORPORATION
Kellogg Brown & Root Pty Ltd	South Australia
Kellogg Brown & Root Pty Ltd - North West Program Alliance	Australia
Kellogg Brown & Root Pty Ltd - WaterSecure	Australia
Kellogg Brown & Root Qatar Limited	England & Wales
Kellogg Brown & Root Saudi Ltd. Co.	Saudi Arabia
Kellogg Brown & Root Services B.V.	Netherlands
Kellogg Brown & Root Services International, Inc.	Delaware
Kellogg Brown & Root Services LLC	Oman
Kellogg Brown & Root Technology (Beijing) Co. Ltd	China
Kellogg Brown & Root Trustees Limited	Scotland
Kellogg Energy Services Nigeria Limited	Nigeria
Kellogg France, S.A.	France
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	Delaware
NSI (AUST) PTY LTD	South Australia
Overseas Administration Services, Ltd.	Cayman Islands
Overseas Supply Services Limited	England & Wales
Plinke GmbH	Germany
PT KBR Engineers Indonesia	Indonesia
PT KBR Indonesia	Indonesia
PT Roberts Schaefer Soros Indonesia	Indonesia
R and S Engineering (India) Private Limited	India
Semi Sub Services B.V.	Netherlands
Service Employees International, Inc.	Cayman Islands
Sigma Bravo Pty Ltd	Australia
Southern Gas Constructors Limited	Nigeria
Systra- KBR Joint Venture	Australia
Technical Staffing Resources Limited	England & Wales
Technical Staffing Resources, LLC	Delaware
Tres Gaviotas, S. de R.L. de C.V.	Mexico
TSKJ II Construcoes Internacionais Sociedade Unipessoal Limitada	Portugal
Vinnell Brown & Root LLC	Delaware
Wabi Development Mexico, S.A. de C.V.	Distrito Federal
WD Servicios, S.A. de C.V.	Distrito Federal
Weatherly Inc.	Georgia

NAME OF COMPANY	STATE OR COUNTRY OF INCORPORATION
Wyle Inc.	Delaware
Wyle Information Systems, LLC	Delaware
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, 2021. 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, 2021.