Exhibit 12.1

CHIEF EXECUTIVE OFFICER CERTIFICATION

I, Frank E. Dangeard, certify that:

|1. | I have reviewed this amended annual report on Form 20-F/A of Thomson;                                                                                                                                                                                                                                                                     
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|2. | Based
        on my knowledge, this report does not contain any untrue statement of
        a material fact or omit to state a material fact necessary to make the
        statements made, in light of the circumstances under which such statements
        were made, not misleading with respect to the period covered by this report;
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|3. | Based on my knowledge, the financial statements, and other financial information included in this annual report, fairly present in all material respects the financial condition, results of operations and cash flows of the company as of, and for, the periods presented in this report;                                               
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|4. | The companys other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the company and have:                                                                                                                    
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|   | c)                                                                                                                                                                                                                                                                                                                                        
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|5. | The companys other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the company's auditors and the audit committee of the companys board of directors (or persons performing the equivalent functions):                                                   
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|   | b)                                                                                                                                                                                                                                                                                                                                        



|Date:
        December 22, 2005 |  | /s/ Frank
        E. Dangeard                                          
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|                                |  | Frank
        E. Dangeard 
        Chairman and Chief Executive Officer