1965-66 Eastern Canada Memorial Cup Playoffs

Champions

 * Northern Ontario: North Bay Trappers
 * Ontario: Oshawa Generals
 * Ottawa: Cornwall Royals
 * Quebec: Shawinigan Falls Bruins
 * Maritimes: Halifax Canadiens

Quarter Final
Best of 7

Halifax Canadiens beat Cornwall Royals 4 wins to 3.

Semi Finals
Best of 7

Oshawa Generals beat North Bay Trappers 4 wins to none.

Shawinigan Falls Bruins beat Halifax Canadiens 4 wins to none.

Final
Best of 5

Oshawa Generals beat Shawinigan Falls Bruins 3 wins to 1.

Oshawa Generals advanced to the 1965-66 Memorial Cup Final.