Montreal National Soccer League
The National Soccer League was confined to operating in Montreal in the 1945 season.
The member clubs were Carsteel,
Montreal Carsteel won the 1945 Montreal National Soccer League.
Ontario Major League
The Ontario Major League was formed in February 1945. Major A. L. Steele was elected as the league’s first president. Five teams joined the league the same month. These were Ulster United, Toronto Scottish, King Edward, Research and John Inglis. A sixth team would be added later.
Later in February Hamilton Stelcos was awarded the sixth franchise in the league.
Research changed their name to Leaside United.
Final standings first half
| GP | W | L | D | GF | GA | Pts | |
| 1. John Inglis | 10 | 8 | 0 | 2 | 28 | 4 | 18 |
| 2. Ulster United | 10 | 3 | 2 | 5 | 26 | 23 | 11 |
| 3. King Edward | 10 | 4 | 4 | 2 | 24 | 18 | 10 |
| 4. Toronto Scottish | 10 | 3 | 4 | 3 | 18 | 28 | 9 |
| 5. Hamilton Stelco | 10 | 2 | 5 | 3 | 14 | 20 | 7 |
| 6. Leaside United | 10 | 2 | 7 | 1 | 16 | 28 | 5 |
Final standings second half
| GP | W | L | D | GF | GA | Pts | |
| 1. John Inglis | 10 | 7 | 1 | 2 | 32 | 13 | 23 |
| 2. Ulster United | 10 | ||||||
| 3. Hamilton Stelco | 10 | ||||||
| 4. Toronto Scottish | 10 | ||||||
| 5. King Edward | 10 | ||||||
| 6. Leaside United | 10 | 1 | 8 | 1 | 16 | 37 | 4 |
Playoffs
Semifinals:
Ulster United defeated Toronto Scottish
John Inglis defeated Hamilton Stelco
Finals:
John Inglis 2, Ulster United 1
John Inglis 1, Ulster United 1
John Inglis won Ontario Major Soccer League championship with total-goals 3-2.
Toronto Senior League
First Division
| GP | W | L | D | Pts | |
| 1. East End Canadians | 10 | 10 | 0 | 0 | 20 |
| 2. Mahers | 10 | ||||
| 3. Hagibor | 10 | ||||
| 4. Bowsers A. C. | 10 | ||||
| 5. Liptons | 10 | ||||
| 6. Navy | 10 |
Champions: East End Canadians
Second Division
Clubs: Ady F.C., Ajax Rangers, C. G. E., Mimico Beach, Newmarket “A”, R. E. L., Rogers Majestic, Rooneys, Slavia, Slovaks, Toronto Iris.
C.G.E. made a return to soccer after 15 years. Ajax Rangers of Claremont joined the league.
Champions: C.G.E.