1965-66 Eastern Canada Allan Cup Playoffs

Champions

 * Northern Ontario:	Sudbury-Levack Steelworkers
 * Central Ontario:	Collingwood Shipbuilders
 * Ontario:		Guelph Royals
 * Ottawa:		Morrisburg Combines
 * Quebec:		Sherbrooke Castors
 * Maritimes:	Moncton Hawks

Quarter Finals
Best of 7

Collingwood Shipbuilders led 3 games to 1. Sudbury-Levack Steelworkers conceded.

Morrisburg Combines beat Moncton Hawks 3 games to 1.

Semi Finals
Best of 7

Guelph Royals beat Collingwood Shipbuilders 4 games to none.

Sherbrooke Castors beat Morrisburg Combines 4 games to 3.

Final
Best of 7

Sherbrooke Castors beat Guelph Royals 4 games to 2.

Sherbrooke Castors advanced to the 1965-66 Allan Cup Final.