1989-90 Eastern Canada Allan Cup Playoffs

These determined the Eastern Canadian representative in the 1990 Allan Cup Final.

Champions

 * Quebec: Montreal-Chomedy Construction
 * Manitoba: Thunder Bay Twins

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.