- Dec 2 National Hockey Association (NHA) is formed in Montreal; original members include Montreal Wanderers and Montreal Canadiens; becomes NHL after some NHA teams leave due to ownership disagreements, and create their own league
- Dec 4 1st CFL Grey Cup, Rosedale Field, Toronto: University of Toronto Blues beat Toronto Parkdale Canoe Club, 26-6; Blues undefeated
- Dec 4 Oldest still-operating NHL franchise is officially established as J. Ambrose O’Brien and Jack Laviolette create the “Club de Hockey Canadien,” known today as the Montreal Canadiens
- Dec 15 Thomas J. Lynch becomes president of baseball's National League
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