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**Exhibit 12.1**

I, Patricio Jottar, certify that: 

1. I have reviewed this  annual report on Form 20-F of CompañíaCervecerías Unidas S.A. ; 

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, notmisleading with respect to the period covered by this report; 

3. Based on my knowledge, the financial statements, and other financial information included in this 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; 

4. The company's other  certifying officer 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: 

| a)     | Designed    such disclosure controls and procedures, or caused such disclosure controls    and procedures to be designed under our supervision, to ensure that material    information relating to the company, including its consolidated subsidiaries,    is made known to us by others within those entities, particularly during  the period in which this report is being prepared; |
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| b)     | Evaluated the effectiveness    of the company's disclosure controls and procedures and presented in this    report our conclusions about the effectiveness of the disclosure controls    and procedures, as of the end of the period covered by this report based  on such evaluation; and                                                                                               |
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| c)     | Disclosed in this report    any change in the company's internal control over financial reporting that    occurred during the period covered by the annual report that has materially    affected, or is reasonably likely to materially affect, the company's internal  control over financial reporting;                                                                               |

5. The company's other certifying officer and I have disclosed, based on our most recent evaluation, to the company's auditors and the audit committee ofcompany's board of directors (or persons performing the equivalent function): 

| a)     | All significant    deficiencies and material weaknesses in the design or operation of internal    control over financial reporting which are reasonably likely to adversely    affect the company's ability to record, process, summarize and report financial    information; and |
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| b)     | any fraud, whether    or not material, that involves management or other employees who have a significant    role in the company's internal control over financial reporting.                                                                                                      |

| Date : June 24, 2004    | /s/ Patricio Jottar |
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| Chief Executive Officer |