Ligue de hockey senior du Québec
The CAHA continued the Major Series for a second season, and required its leagues to post a $5,000 bond and guarantee a champion by a national deadline. Only the Quebec Senior Hockey League and the Maritime Major Hockey League would play in the Major Series for the 1951–52 season. The CAHA ratified an agreement reached with the NHL which set a deadline of January 15 for drafting players from the Major Series with exceptions only for emergency replacements. The deal avoided the loss of players for the playoffs. The Quebec Senior Hockey League demanded a better deal to remain amateur and part of the Major Series and later chose to leave CAHA jurisdiction, become professional and discontinue competition for the Alexander Cup.