The 1991 Allan Cup was the Canadian senior ice hockey championship for the 1990–91 senior "AAA" season. The event was hosted by the Thunder Bay Twins in Thunder Bay, Ontario. The 1991 tournament marked the 83rd time that the Allan Cup has been awarded.

Silver bowl trophy with two large handles, mounted on a black plinth.
The Allan Cup trophy

Teams

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Best-of-Seven Series

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Charlottetown Islanders 5 - Thunder Bay Twins 3
Charlottetown Islanders 5 - Thunder Bay Twins 2
Charlottetown Islanders 5 - Thunder Bay Twins 4
Charlottetown Islanders 5 - Thunder Bay Twins 4 (OT)
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