The 1991 Canadian Football League season is considered to be the 38th season in modern-day Canadian football, although it is officially the 34th Canadian Football League season.

Harry Ornest sold the Toronto Argonauts to Bruce McNall, Wayne Gretzky and John Candy on Monday, February 25. On Wednesday, July 24, the Board of Directors of the Ottawa Rough Riders resigned, causing the CFL to assume the ownership duties of the franchise, two days later. Three months later, the Rough Riders were sold by the CFL to Bernie and Lonie Glieberman on Saturday, October 19. Furthermore, the Calgary Stampeders was purchased by Larry Ryckman from Stampeder Football Club Limited on Friday, October 24.

All eight clubs combined for a record 64.2 points per game and attendance figures broke the 2 million mark for the 10th time in CFL history (2,001,858). The Grey Cup game was hosted by the city of Winnipeg for the first time on Sunday, November 24. In that game, the Toronto Argonauts defeated the Calgary Stampeders 36–21 in front of 51,985 football fans. The Grey Cup game was also the most-watched Canadian television show with an audience of 3,531,000 viewers.

J. Donald Crump resigned as CFL Commissioner on Tuesday, December 31.

Note: GP = Games Played, W = Wins, L = Losses, T = Ties, PF = Points For, PA = Points Against, Pts = Points

The Toronto Argonauts are the 1991 Grey Cup champions, defeating the Calgary Stampeders 36–21, at Winnipeg Stadium. This was the first championship for the Argonauts in eight years. The Argonaut's Raghib "Rocket" Ismail (WR) was named the Grey Cup's Most Valuable Player and Stampeder's Dave Sapunjis (SB) was the Grey Cup's Most Valuable Canadian.

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