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Exhibit 12.1

CERTIFICATIONS

I, Guy Fauré,
certify that:

|1. |  | I
have reviewed this annual report on Form 20-F of Mamma.com Inc.;
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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 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 officer(s) 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)) and internal
control over financial                reporting (as defined in Exchange Act Rules
13a-15(f) and 15d-15(f)) 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) |  | [Paragraph
omitted pursuant to SEC Release Nos. 33-8545 and 34-51293]
| | -- |  | ---------------------------------------------------------------------

| | c) |  | 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
| | -- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | d) |  | 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; and;
| | -- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

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|5. |  | The companys
other certifying officer(s) 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):
|-- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | 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.
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Date: May 27, 2005

| | s/s
Guy Fauré
Guy Fauré President
and Chief Executive Officer
| | -------------------------------------------------------------

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