The 1988 Allan Cup was the Canadian national senior ice hockey championship for the 1987-88 Senior "AAA" season. The event was hosted by the Thunder Bay Twins in Thunder Bay, Ontario. The 1988 playoff marked the 80th time that the Allan Cup has been awarded.
- Thunder Bay Twins 7 - Charlottetown Islanders 4
- Thunder Bay Twins 10 - Charlottetown Islanders 2
- Thunder Bay Twins 9 - Charlottetown Islanders 3
- Thunder Bay Twins 7 - Charlottetown Islanders 1