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Exhibit 21.1

LIST OF SUBSIDIARIES

KBR, INC.

Subsidiaries of Registrant as of January 3, 2025

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
AOC International Limited						United Kingdom
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
BE&K de Mexico, S.A. de C.V.						Mexico
BE&K, Inc.						United States
BetterKonnected Joint Venture						Australia
Blandford Offshore Services Limited						United Kingdom
Bonny 7 Project Management Company Limited						United Kingdom
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
Clearbox Systems Pty Limited						Australia
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

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NAME OF COMPANY						COUNTRY OF INCORPORATION
Frazer-Nash Consultancy Limited						United Kingdom
Frazer-Nash Consultancy LLC						United States
FTX Logistics Limited						United Kingdom
Granherne Limited						United Kingdom
Harmonic Limited						United Kingdom
HomeSafe Alliance LLC						United States
Howard Humphreys (Kenya) Limited						Kenya
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 Arabia Limited						Saudi Arabia
KBR Australia Pty Ltd						Australia
KBR Canada Ltd						Canada
KBR Charitable Foundation, Inc.						United States
KBR Conscia JV						Australia
KBR Construction Company, LLC						United States
KBR Diego Garcia, LLC						United States
KBR Employment Services Limited						United Kingdom
KBR Engineering Company, LLC						United States
KBR Engineering of North Carolina, Inc.						United States
KBR General Partner Limited						United Kingdom
KBR Gerenciamento de Projectos e Servicos de Estudos Industriais Conceituais Basicos E De.						Brazil

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NAME OF COMPANY						COUNTRY OF INCORPORATION
KBR GMBH						Germany
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 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 Technical Services, Inc.						United States
KBR WABI LTD.						Canada
KBR Wyle Services, LLC						United States
KBR, Inc.						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
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 (Ukraine) LLC						Ukraine
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

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NAME OF COMPANY						COUNTRY OF INCORPORATION
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 - Transport for Tomorrow						Australia
Kellogg Brown & Root Pty Ltd - WaterSecure						Australia
Kellogg Brown & Root Pty Ltd & MetConnx						Australia
Kellogg Brown & Root Regional Headquarters						Saudi Arabia
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
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 France, S.A.						France
KHA Defence Solutions Pty Ltd.						Australia
Kord Technologies, LLC						United States
Labor Support Services Limited						Cayman Islands
Laurel Financial Services 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
Phoenix (U.K.) Fusion Limited						United Kingdom
PT KBR Indonesia						Indonesia

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NAME OF COMPANY						COUNTRY OF INCORPORATION
PT Roberts Schaefer Soros Indonesia						Indonesia
R and S Engineering (India) Private Limited						India
Semi Sub Services B.V.						Netherlands
Sigma Bravo Pty Ltd						Australia
Solutions Insurance Company						United States
Sustainable System Solutions, LLC						United States
Systra - KBR Joint Venture						Australia
Technical Staffing Resources Limited						United Kingdom
Technical Staffing Resources, LLC						United States
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
Wyle Inc.						United States

*    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 January 3, 2025. 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 January 3, 2025.