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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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                                    FORM 8-K


                                 CURRENT REPORT
     PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934


         Date of Report (Date of earliest event reported): April 3, 2006

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                            CENTURY ALUMINUM COMPANY
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             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)


           DELAWARE                      0-27918                  13-3070826
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(State or other jurisdiction    (Commission File Number)        (IRS Employer
      of Incorporation)                                      Identification No.)

             2511 GARDEN ROAD
          BUILDING A, SUITE 200
           MONTEREY, CALIFORNIA                                93940
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(Address of principal executive offices)                    (Zip Code)


                                 (831) 642-9300
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              (Registrant's telephone number, including area code)


                                       N/A
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          (Former name or former address, if changed since last report)


Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligation of the registrant under any of the
following provisions:

|_|    Written communications pursuant to Rule 425 under the Securities Act (17
       CFR 230.425)

|_|    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17
       CFR 240.14a-12)

|_|    Pre-commencement communications pursuant to Rule 14d-2(b) under the
       Exchange Act (17 CFR 240.14d-2(b))

|_|    Pre-commencement communications pursuant to Rule 13e-4(c) under the
       Exchange Act (17 CFR 240.13e-4(c))

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ITEM 7.01 REGULATION FD DISCLOSURE

         On April 3, 2006, Century Aluminum Company (the "Company") issued a
press release announcing the acceleration of the further expansion of its
aluminum smelter in Grundartangi, Iceland from 220,000 metric tons per year
("mtpy") to 260,000 mtpy. The Company announced that the additional expansion
should be completed by the fourth quarter of 2007. The Company had previously
announced that power for the additional expansion was expected in late 2008. The
Company expects that the expansion from 220,000 mtpy to 260,000 mtpy should cost
approximately $3,000 per metric ton of expansion capacity, or approximately $120
million for the additional expansion.

         The information in this Form 8-K and Exhibit 99.1 attached hereto may
contain "forward-looking statements" within the meaning of U.S. federal
securities laws. The Company has based its forward-looking statements on current
expectations and projections about the future, however, these statements are
subject to risks, uncertainties and assumptions, any of which could cause the
Company's actual results to differ materially from those expressed in its
forward-looking statements. More information about these risks, uncertainties
and assumptions can be found in the risk factors and forward-looking statements
cautionary language contained in the Company's Annual Report on Form 10-K and in
other filings made with the Securities and Exchange Commission. The Company does
not undertake, and specifically disclaims, any obligation to revise any
forward-looking statements to reflect the occurrence of anticipated or
unanticipated events or circumstances after the date such forward-looking
statements are made.

ITEM 9.01. FINANCIAL STATEMENTS AND EXHIBITS

         (C) EXHIBITS

         The following exhibit is being furnished with this report pursuant to
Item 7.01:

Exhibit Number                Description
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    99.1              Press Release, dated April 3, 2006, announcing the
                      Company's acceleration of the further expansion of its
                      aluminum smelter in Grundartangi, Iceland from 220,000
                      metric tons per year to 260,000 metric tons per year by
                      the fourth quarter of 2007.


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                                   SIGNATURES

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the Registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.


                                             CENTURY ALUMINUM COMPANY

Date: April 4, 2006                    By: /s/ Michael Bless
                                           ------------------------------------
                                           Name:  Michael Bless
                                           Title: Executive Vice President and
                                                  Chief Financial Officer


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                                  EXHIBIT INDEX


Exhibit Number                Description
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     99.1                 Press Release, dated April 3, 2006, announcing the
                          Company's acceleration of the further expansion of its
                          aluminum smelter in Grundartangi, Iceland from 220,000
                          metric tons per year to 260,000 metric tons per year
                          by the fourth quarter of 2007.


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