Exhibit 21.1

LIST OF SUBSIDIARIES

KBR, INC.

Subsidiaries of Registrant as of December 31, 2020

NAME OF COMPANY	STATE OR COUNTRY OF INCORPORATION
BE&K, Inc.	Delaware
BITC (US) LLC	Delaware
Brown & Root Construction Pty Ltd	Australia
Brown & Root Investments (No. 1) Pty Ltd	Australia
Brown & Root Operations (No. 1) Pty Ltd	Australia
Brown & Root Projects (No. 1) Pty Ltd	Australia
Brown & Root Projects Pty Ltd	Australia
Centauri Equity Holdings, LLC	Delaware
Centauri Financing Holdings, LLC	Delaware
Centauri Group Holdings, LLC	Delaware
Centauri Holdings Parent, LLC	Delaware
Centauri Platform Holdings, LLC	Delaware
Centauri, LLC	Virginia
Corporacion Mexicana de Mantenimiento Integral S. de R.L. de C.V.	Mexico
Energo Engineering Services, LLC	Texas
Fasttrax Holdings Limited	United Kingdom, England & Wales
Fasttrax Limited	United Kingdom, England & Wales
FTX Logistics Limited	United Kingdom, England & Wales
Granherne Pty Ltd	Australia
Granherne, Inc.	Texas
Howard Humphreys & Partners Limited	United Kingdom, England & Wales
KBR (Aspire Construction) Holdings Limited	United Kingdom, England & Wales
KBR (Aspire Construction) Limited	United Kingdom, England & Wales
KBR (Aspire Construction) Holdings No. 2 Limited	United Kingdom, England & Wales
KBR (Aspire Services) Holdings Limited	United Kingdom, England & Wales
KBR (Aspire Services) Holdings No.2 Limited	United Kingdom, England & Wales
KBR (Aspire Services) Limited	United Kingdom, England & Wales
KBR (U.K.) Investments Limited	United Kingdom, England & Wales
KBR Arabia Limited	Saudi Arabia
KBR Australia Pty Ltd	Australia
KBR Canada Ltd	Canada
KBR E&C Australia Pty Ltd	Australia
KBR Engineering Company, LLC	Delaware

NAME OF COMPANY	STATE OR COUNTRY OF INCORPORATION
KBR Group Holdings, LLC	Delaware
KBR Holdings Pty Ltd	Australia
KBR Holdings, LLC	Delaware
KBR Industrial Canada Co.	Canada
KBR Netherlands Investments B.V.	Netherlands
KBR Overseas, Inc.	Delaware
KBR Plant Services, Inc.	Delaware
KBR USA LLC	Delaware
KBR WABI LTD.	Canada
KBRDC Egypt Cayman Ltd.	Cayman Islands
Kellogg Brown & Root (Greenford) Limited	United Kingdom, England & Wales
Kellogg Brown & Root (Norway) AS	Norway
Kellogg Brown & Root (Services) Limited	United Kingdom, England & Wales
Kellogg Brown & Root (U.K.) Limited	United Kingdom, England & Wales
Kellogg Brown & Root Asia Pacific Pte Ltd	Singapore
Kellogg Brown & Root DH Limited	United Kingdom, England & Wales
Kellogg Brown & Root Engineering & Construction India Private Limited	India
Kellogg Brown & Root Engineers Pte Ltd	Singapore
Kellogg Brown & Root Financial Services B.V.	Netherlands
Kellogg Brown & Root Group Limited	United Kingdom, England & Wales
Kellogg Brown & Root Holding B.V.	Netherlands
Kellogg Brown & Root Holdings (U.K.) Limited	United Kingdom, England & Wales
Kellogg Brown & Root Holdings Limited	United Kingdom, England & Wales
Kellogg Brown & Root International Group Holdings LLP	United Kingdom, England & Wales
Kellogg Brown & Root International Group Limited	United Kingdom, England & Wales
Kellogg Brown & Root International Holdings, Inc.	Delaware
Kellogg Brown & Root International, Inc.	Panama
Kellogg Brown & Root International, Inc.	Delaware
Kellogg Brown & Root Investment Holdings Limited	United Kingdom, England & Wales
Kellogg Brown & Root Limited	United Kingdom, England & Wales
Kellogg Brown & Root Limited – Azmi Abdullatif Abdulhadi & Abdullah Mahana Al-Moaibed Consulting Engineering Professional Partnership	Saudi Arabia
Kellogg Brown & Root LLC	Delaware
Kellogg Brown & Root London Holdings Limited	United Kingdom, England & Wales
Kellogg Brown & Root London Limited	United Kingdom, England & Wales
Kellogg Brown & Root Overseas Limited	United Kingdom, England & Wales
Kellogg Brown & Root Overseas Operations Limited	United Kingdom, England & Wales
Kellogg Brown & Root Overseas Projects Limited	United Kingdom, England & Wales
Kellogg Brown & Root Pty Ltd	Australia
Kellogg Brown & Root Services B.V.	Netherlands

NAME OF COMPANY	STATE OR COUNTRY OF INCORPORATION
Kellogg Brown & Root Saudi Ltd. Co.	Saudi Arabia
Laurel Financial Services B.V.	Netherlands
LTS Holdings, Inc.	Delaware
MMM-SS Holdings, LLC	Delaware
Overseas Supply Services Limited	United Kingdom, England & Wales
PT KBR Indonesia	Indonesia
Technical Staffing Resources, LLC	Delaware
Wyle Inc.	Delaware

*    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, 2020. 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(v) of Regulation S-X) at December 31, 2020.