1956-57 Northern Ontario Senior Playoffs

This is the 1956-57 Northern Ontario senior playoffs:

Finalists

 * Porcupine Mines League: South Porcupine Porkies
 * Southern Section: North Bay Trappers

Regional Final
Best of 5

North Bay Trappers beat South Porcupine Porkies 3 games to none.

North Bay Trappers advanced to the 1956-57 Eastern Canada Allan Cup Playoffs.