Exhibit 21



Unocal Corporation Subsidiaries



|                                                        |  |               
|------------------------------------------------------- |  | --------------
|Company Name1                                           |  | Jurisdiction  
|Union Oil Company of California                         |  |               
|HUTTS, LLC                                              |  | Delaware      
|La Floresta, LLC2                                       |  | Delaware      
|Midwest 76, Inc.                                        |  | Delaware      
|Chicago Carbon Company, an Illinois general partnership |  | Illinois      
|Molycorp, Inc.                                          |  | Delaware      
|Pure Resources, Inc.                                    |  | Delaware      
|Unocal Energy Trading Inc.                              |  | Delaware      
|Unocal Foreign Investments Inc.                         |  | Delaware      
|Unocal Geothermal of Indonesia, Ltd.                    |  | Bermuda       
|Dayabumi Salak Pratama, Ltd.                            |  | Cayman Islands
|Unocal International Corporation                        |  | Nevada        
|Unocal BTC Pipeline, Ltd.                               |  | Bermuda       
|Unocal Canada Limited                                   |  | Alberta       
|Northrock Resources Ltd.                                |  | Alberta       
|Unocal Canada Alberta Hub Limited                       |  | Alberta       
|Unocal Congo (DRC), Ltd.                                |  | Bermuda       
|Unocal Donggala, Ltd.                                   |  | Bermuda       
|Unocal Ganal, Ltd.                                      |  | Bermuda       
|Unocal Global Ventures, Ltd.                            |  | Bermuda       
|Unocal Asia-Pacific Ventures, Ltd.                      |  | Bermuda       
|Unocal Bangladesh Block Twelve, Ltd.                    |  | Bermuda       
|Unocal Bangladesh Blocks Thirteen and Fourteen, Ltd.    |  | Bermuda       
|Unocal Bangladesh, Ltd.                                 |  | Bermuda       
|Unocal Bangladesh Exploration, Ltd.                     |  | Bermuda       
|Unocal Khazar Holdings, Ltd.                            |  | Bermuda       
|Unocal Khazar, Ltd.                                     |  | Bermuda       
|Unocal Makassar, Ltd.                                   |  | Bermuda       
|Unocal Myanmar Offshore Co., Ltd.                       |  | Bermuda       
|Unocal Indonesia, Ltd.                                  |  | Bermuda       
|Unocal Indonesia Company                                |  | Bermuda       
|Unocal Netherlands B. V.                                |  | Netherlands   
|Unocal Rapak, Ltd.                                      |  | Bermuda       
|Unocal Thailand, Ltd.                                   |  | Bermuda       
|Unocal International Supply & Trading Co.               |  | California    
|Unocal Philippines, Inc.                                |  | California    
|Unocal Pipeline Company                                 |  | California    

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|1 | All companies ultimately owned 100 percent by Unocal except where otherwise indicated. The level of indentation indicates at what level in the organization the
subsidiary is owned. The names of approximately 220 subsidiaries are omitted inasmuch as such subsidiaries, considered in the aggregate as a single subsidiary, would not constitute a significant subsidiary.
|- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|2 | Unocal owns an 86% interest.
|- | ----------------------------