Congressional Integrity and Pension Forfeiture Act of 2005 - Requires the Office of Personnel and Management (OPM) to prescribe regulations that prohibit eligibility in the governmental retirement system for a Member convicted of certain offenses that are: (1) committed by the individual while a Member, (2) related to the individual's service as a Member, and (3) after enactment of this Act. Refunds annuity contributions and deposits, excluding interest earned, to a convicted individual. Authorizes the Executive Director of the Federal Retirement Thrift Investment Management System to prescribe necessary regulations with respect to the Thrift Saving Plan and which include provisions requiring the return of all vested amounts attributable to periods of service rendered by the individual as a Member.
Defines "Member" as "the Vice President, a member of the Senate or the House of Representatives, a Delegate to the House of Representatives, and the Resident Commissioner from Puerto Rico."