The 2005 CIS football season began on September 1, 2005, and concluded with the 41st Vanier Cup national championship on December 3 at Ivor Wynne Stadium in Hamilton, Ontario, with the Wilfrid Laurier Golden Hawks winning their second championship. Twenty-seven universities across Canada competed in CIS football this season, the highest level of amateur play in Canadian football, under the auspices of Canadian Interuniversity Sport (CIS).