Table of Contents

Exhibit 12.1

I, Patricio Jottar,
certify that:

|1. | I have reviewed this annual report on Form 20-F of Compañía Cervecerías 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, not misleading 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;
| | -- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | 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
| | -- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | 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 of company'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
| | -- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | 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 28, 2005

| | /s/
Patricio
Jottar

Chief
Executive Officer
| | --------------------------------------------