This is the 1990-91 Central Amateur Senior Hockey League Season.
Manitoba Senior 'AAA' Hockey Championship
- 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 defeated St. James 3-games-to-none
Warroad defeated St. Boniface
- Semi Finals
Thunder Bay defeated Warroad
- Pattison Cup Championship
Western Canadian ChampionshipEdit
- Allan Cup Playoffs
- Western Canada Allan Cup Semi-Final
- Thunder Bay Twins defeated Kindersley Klippers 3-games-to-none
- Western Canada Allan Cup Final (Patton Cup)
- Thunder Bay Twins defeated Paul Band Black Hawks 4-games-to-none
- see 1990-91 Western Canada Allan Cup Playoffs
- Allan Cup Championship
- Thunder Bay Twins lost to Charlottetown Islanders 4-games-to-none
- see 1991 Allan Cup
| Trophy || Winner || Team
| MVP || ?????
| Top Goaltending (GAA) || ?????
| Scoring Champion || ?????
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