This is the 1990-91 Central Amateur Senior Hockey League Season.
- Transcona Kings withdraw.
- League Expands, accepting the Lac du Bonnet Blues and Warroad Lakers.
- Manitoba Amateur Hockey Association announced that League playoffs would be for the Pattison Cup,
- Lac du Bonnet Blues
- Selkirk Steel Kings
- St. Boniface Mohawks
- St. James Flames
- Thunder Bay Twins
- Warroad Lakers
- Thunder Bay Twins defeated St. James Flames 3-games-to-none
- Warroad Lakers defeated ?????
- Pattison Cup Championship
- Thunder Bay Twins defeated Warroad Lakers
Western Canadian ChampionshipEdit
- Allan Cup Playoffs
|Top Goaltending (GAA)||?????|