Under head coach Les Lear, the 1948 Calgary Stampeders completed a perfect regular season with a record of 12-0; they had two wins and a tie during the playoffs to finish with a record of 14-0-1, the only undefeated complete season in Canadian pro history [REF].
In 1975 the number one ranked University of Ottawa Gee Gees had the first CIS undefeated season.