1957-58 Thunder Bay Senior Playoffs

Independent Teams

 * Port Arthur Bearcats
 * Fort William Beavers

Final
Best of 7


 * Port Arthur 9 Fort William 2
 * Fort William 5 Port Arthur 3
 * Fort William beat Port Arthur
 * Fort William 4 Port Arthur 3
 * Fort William 7 Port Arthur 3

Fort William Beavers beat Port Arthur Bearcats 4 wins to 1.

Fort William Beavers advanced to the 1957-58 Western Canada Allan Cup Playoffs.