**Exhibit 21.1**

** **

**SUBSIDIARIES OF NEXEN AS AT JANUARY 31, 2010**

 

**CanadianNexen Petroleum East Al Hajr Ltd.**

Incorporated pursuant to thelaws of Alberta

 

**CanadianNexen Petroleum Yemen**

A partnership doing businessin Yemen

 

**CanadianPetroleum Yemen Limited**

Incorporated pursuant to thelaws of Jersey

 

**CanadianOxyOffshore Production Co.**

Incorporated pursuant to thelaws of Delaware

 

**Canexus Limited Partnership**

A partnership formedpursuant to the laws of Alberta

 

**ICH CapitalManagement Hungary Limited Liability Company**

Incorporated pursuant to thelaws of Hungary

 

**ICMAssurance Ltd.**

Incorporated pursuant to thelaws of Barbados

 

**ICM CapitalLimited**

Incorporatedpursuant to the laws of Barbados

 

**InternationalCapital Holdings Limited**

Incorporated pursuant to thelaws of Malta

 

**Long LakeFinance Management Ltd.**

Incorporated pursuant to thelaws of Alberta

 

**NexenChemicals Holdings U.S.A. Inc.**

Incorporated pursuant to thelaws of Delaware

 

**NexenChemicals U.S.A.**

A partnership formedpursuant to the laws of Delaware

 

**NexenChemicals U.S.A. Inc.**

Incorporated pursuant to thelaws of Delaware

 

**NexenCrossfield Partnership**

A partnership formedpursuant to the laws of Alberta

 

**Nexen E &P Services Nigeria Limited**

Incorporated pursuant to thelaws of Nigeria

 

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**NexenEnergy Holdings International Limited**

Incorporated pursuant to thelaws of Jersey

 

**Nexen Energy Marketing EuropeLimited**

Incorporated pursuant to thelaws of the United Kingdom

 

**Nexen Energy Marketing LondonLimited**

Incorporated pursuant to thelaws of the United Kingdom

 

**NexenEnergy Marketing Middle East Limited**

Incorporatedpursuant the laws of Dubai

 

**NexenEnergy Marketing Nigeria Limited**

Incorporatedpursuant to the laws of Nigeria

 

**NexenEnergy Services International Ltd.**

Incorporated pursuant to thelaws of the United Kingdom

 

**NexenEttrick U.K. Limited**

Incorporated pursuant to thelaws of the United Kingdom

 

**Nexen Exploration Norge AS**

Incorporated pursuant to thelaws of Norway

 

**NexenExploration U.K. Limited**

Incorporated pursuant to thelaws of the United Kingdom

 

**Nexen FieldServices Nigeria Limited**

Incorporated pursuant to thelaws of Nigeria

 

**NexenHoldings U.S.A. Inc.**

Incorporated pursuant to thelaws of Delaware

 

**NexenHoldings West Africa Limited**

Incorporated pursuant to thelaws of Jersey

 

**Nexen Marketing**

A partnership formedpursuant to the laws of Alberta

 

**NexenMarketing International Ltd.**

Incorporated pursuant to thelaws of Barbados

 

**NexenMarketing Singapore Pte Ltd.**

Incorporated pursuant to thelaws of Singapore

 

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**NexenMarketing U.S.A. Inc.**

Incorporated pursuant to thelaws of Delaware

 

**Nexen New Venture Jersey Limited**

Incorporated pursuant to thelaws of Jersey

 

**Nexen MedHat-Hatton Partnership**

A partnership formedpursuant to the laws of Alberta

 

**Nexen No. 6 Ltd.**

Incorporated pursuant to thelaws of Alberta

 

**Nexen ofCalifornia, Inc.**

Incorporated pursuant to thelaws of Delaware

 

**Nexen Oiland Gas U.K. Developments LP**

Apartnership formed pursuant to the laws of the United Kingdom

 

**Nexen Oil Sands Partnership**

A partnership formedpursuant to the laws of Alberta

 

**NexenOilfield Services Nigeria Ltd.**

Incorporated pursuant to thelaws of Barbados

 

**NexenPetroleum Australia Pty Limited**

Incorporated pursuant to thelaws of Australia

 

**NexenPetroleum Capital Management U.S.A. Inc.**

Incorporated pursuant to thelaws of Delaware

 

**NexenPetroleum Colombia Limited**

Incorporated pursuant to thelaws of Jersey

 

**Nexen Petroleum Deepwater NigeriaLimited**

Incorporated pursuant to thelaws of Nigeria

 

**NexenPetroleum Equatorial Guinea Limited**

Incorporated pursuant to thelaws of Jersey

 

**NexenPetroleum Exploration and Production Nigeria Limited**

Incorporated pursuant to thelaws of Nigeria

 

**NexenPetroleum Holdings Australia Pty Limited**

Incorporated pursuant to thelaws of Australia

 

**NexenPetroleum Holdings U.S.A. Inc.**

Incorporated pursuant to thelaws of Delaware

 

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**NexenPetroleum International (U.S.A.) Inc.**

Incorporated pursuant to thelaws of Delaware

 

**Nexen Petroleum International Co.**

Amalgamated pursuant to thelaws of Nova Scotia

 

**NexenPetroleum Nigeria Limited**

Incorporated pursuant to thelaws of Nigeria

 

**NexenPetroleum Nigeria Offshore Ltd.**

Incorporated pursuant to thelaws of Alberta

 

**NexenPetroleum Offshore U.S.A. Inc.**

Incorporated pursuant to thelaws of Delaware

 

**NexenPetroleum Operations Yemen Limited**

Continued pursuant to thelaws of Jersey

 

**NexenPetroleum Sales U.S.A. Inc.**

Incorporated pursuant to thelaws of Texas

 

**NexenPetroleum U.K. Holdings Limited**

Incorporated pursuant to thelaws of the United Kingdom

 

**NexenPetroleum U.K. Limited**

Incorporated pursuant to thelaws of the United Kingdom

 

**NexenPetroleum U.S.A. Inc.**

Incorporated pursuant to thelaws of Delaware

 

**Nexen Pipeline U.S.A. Inc.**

Incorporated pursuant to thelaws of Wyoming

 

**NexenServices Jersey Limited**

Incorporated pursuant to thelaws of Jersey

 

**WascanaEnergy 2001 Ltd.**

Incorporated pursuant to thelaws of Saskatchewan

 

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