These are the 1950-51 playoffs for the Ontario Hockey Association's Senior B championship:
Teams qualified in the 1950-51 OHA Senior B Season.
Quarter Finals
Best of 5
- Chatham 9 Brantford 3
- Brantford 11 Chatham 4
- Brantford beat Chatham
- Brantford 8 Chatham 3
Brantford beat Chatham Maroons 3 wins to 1.
Best of 7
- Markham 6 Aurora 1
- Markham 3 Aurora 0
- Markham 5 Aurora 3
- Markham 3 Aurora 1
Markham Millionaires beat Aurora 4 wins to none.
Best of 3
- Orillia 8 Weston 7
- Weston beat Orillia
- Weston 10 Orillia 5
Weston Moderns beat Orillia Bombers 2 wins to 1.
Semi Finals
Best of 5
- Brantford 8 Weston 4
- Brantford 11 Weston 3
- Brantford 13 Weston 6
Brantford beat Weston Moderns 3 wins to none.
Best of 7
- Markham 6 Kingston 2
- Kingston 6 Markham 4
- Kingston 8 Markham 3
- Markham 7 Kingston 6
- Markham 9 Kingston 3
- Markham 5 Kingston 4
Markham Millionaires beat Kingston Nylons 4 wins to 2.
Final
Best of 7
- Brantford 11 Markham 2
- Brantford 13 Markham 1
- Brantford 7 Markham 2
- Brantford 7 Markham 4
Brantford beat Markham Millionaires 4 wins to none.