1942-43 Eastern Canada Memorial Cup Playoffs

Semi Finals
Best of 3

Oshawa Generals beat Ottawa St Patricks 2 wins to none.

Montreal Junior Canadiens beat Sydney Bruins 2 wins to none.

Final
Best of 5

Oshawa Generals beat Montreal Junior Canadiens 3 wins to none.

Oshawa Generals advanced to the 1942-43 Memorial Cup Final.