These determined the Eastern Canadian representative in the 1990 Allan Cup Final.
Notes[]
With Senior hockey on the demise, the Canadian Amateur Hockey Association awarded 2 Allan Cup berths to Manitoba’s Central Amateur Senior Hockey League.
Champions[]
Final[]
Best of 7
- Montreal 9 Thunder Bay 2
- Montreal 3 Thunder Bay 2
- Thunder Bay 7 Montreal 4
- Montreal 6 Thunder Bay 2
- Thunder Bay 6 Montreal 3
- Montreal 4 Thunder Bay 2
Montreal-Chomedy Construction beat Thunder Bay Twins 4 wins to 2.
Montreal-Chomedy Construction advanced to the 1990 Allan Cup Final.