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| [X] ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934                   |
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| For the fiscal year ended December 31, 2011                                                           |
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| [   ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934             |
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| For the transition period from _______________________________ to_________________________________________ |

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| Delaware                                                                |   | 94-3030279 |
| (State or other jurisdiction of incorporation or organization)          |   | (I.R.S. Employer Identification No.) |
|                                                                    |   |   |
| 27422 Portola Parkway, Suite 200,            Foothill Ranch, California |   | 92610-2831 |
| (Address of principal executive offices)                                |   | (Zip Code) |
|                                                                    |  (949) 614-1740                                                                                             |   |
| (Registrant's telephone number, including area code)                    |
|                                                                    |   |   |
| Securities registered pursuant to Section 12(b) of the Act:             |
| Title of each class                                                     |   | Name of each exchange on which registered |
| Common stock, par value $0.01 per share                                 |   | Nasdaq Stock Market LLC |
|                                                                    |   |   |
| Securities registered pursuant to section 12(g) of the Act:             |
|                                                                    | NONE |   |

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| Large accelerated filer þ                                              | Accelerated filer o |
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| Non-accelerated filer o  (Do not check if a smaller reporting company) | Smaller reporting company o |

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| Exhibit Number |   | Description |
|           |   |   |
| *31.1          |   | Certification of Jack A. Hockema pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. |
|           |   |   |
| *31.2          |   | Certification of Daniel J. Rinkenberger pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. |
|           |   |   |
| *32.1          |   | Certification of Jack A. Hockema pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. |
|           |   |   |
| *32.2          |   | Certification of Daniel J. Rinkenberger pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. |
|           |   |   |

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|   |  |  |
| * |   | Filed herewith. |

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|        |  |  |  |
|   | KAISER ALUMINUM CORPORATION  |
|   |   | /s/ Jack A. Hockema |
|   |   | Jack A. Hockema  |
|   |   | President and Chief Executive Officer  |