**Exhibit 31.1**
**CERTIFICATIONS**
I, Martin J. Leestma, certify that:
1. I have reviewed this annual report on Form 10-K of Retek Inc.;
2. Based on my knowledge, this report does not contain any untrue statement of amaterial factor omit to state a material fact necessary to make the statements made, in light of thecircumstances under which such statements were made, not misleading with respect to the periodcovered by this report;
3. Based on my knowledge, the financial statements, and other financial informationincluded inthis report, fairly present in all material respects the financial condition, results ofoperations and cash flows of the registrant as of, and for, the periods presented in thisreport;
4. The registrant’s other certifying officer and I are responsible forestablishing andmaintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules13a-15(f) and 15d-15(f)) for the registrant and have:
a) designed such disclosure controls and procedures, or caused such disclosurecontrols andprocedures to be designed under our supervision, to ensure that material information relatingto the registrant, including its consolidated subsidiaries, is made known to us by otherswithin those entities, particularly during the period in which this report is being prepared;
b) designed such internal control over financial reporting, or cause such internalcontrol overfinancial reporting to be designed under our supervision, to provide reasonable assuranceregarding the reliability of financial reporting and the preparation of financial statementsfor external purposes in accordance with generally accepted accounting principles;
c) evaluated the effectiveness of the registrant’s disclosure controls andprocedures andpresented in this report our conclusions about the effectiveness of the disclosure controlsand 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 registrant’s internal control overfinancialreporting that occurred during the registrant’s most recent fiscal quarter (the registrant’sfourth fiscal quarter in the case of an annual report) that has materially affected, or isreasonably likely to materially affect, the registrant’s internal control over financialreporting; and
5. The registrant’s other certifying officer and I have disclosed, based on ourmost recentevaluation of internal control over financial reporting, to the registrant’s auditors and theaudit committee of the registrant’s board of directors (or persons performing the equivalentfunctions):
a) all significant deficiencies and material weaknesses in the design or operation ofinternalcontrol over financial reporting which are reasonably likely to adversely affect theregistrant’s ability to record, process, summarize and report financial information; and
b) any fraud, whether or not material, that involves management or other employeeswho have asignificant role in the registrant’s internal control over financial reporting.   Date: March 14, 2005 **By: /s/ Martin J. Leestma**Martin J. LeestmaChief Executive Officer