Exhibit12.1

 I,      Oswald J. Grübel, certify that:  1.                            I have reviewed this annual report on Form 20-F                          of Credit Suisse Group;  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 registrant as of, and for, the periods                            presented in this report;  4.                                    The registrant’s other certifying officers                                    and I are responsible for establishing and                                    maintaining disclosure controls and procedures                                    (as defined in Exchange Act Rules 13a-15e and                                  15d-15e) for the registrant and we 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 registrant,                                    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 registrant’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                                    registrant’s internal control over financial                                    reporting that occurred during the period covered                                    by the annual report that has materially affected,                                    or is likely to materially affect, the registrant’s                                    internal control over financial reporting;                                  and  5.                                    The registrant’s other certifying officers                                    and I have disclosed, based on our most recent                                    evaluation of internal control over financial                                    reporting, to the registrant’s auditors                                    and the audit committee of the registrant’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 registrant’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 registrant’s internal control over                            financial reporting.  Dated:                            March 30, 2006 /s/ Oswald J. Grübel  Name:                                Oswald J. Grübel  Title:                            Chief Executive Officer