This is the 1970-71 Ontario Major Junior Hockey League Season.
Standings[]
| Team | GP | W | L | T | Pts | GF | GA |
|---|---|---|---|---|---|---|---|
| Peterborough Petes | 62 | 41 | 13 | 8 | 90 | 290 | 174 |
| St. Catharines Black Hawks | 62 | 40 | 17 | 5 | 85 | 343 | 236 |
| Ottawa 67's | 62 | 37 | 19 | 6 | 80 | 296 | 218 |
| Montreal Junior Canadiens | 62 | 35 | 19 | 8 | 78 | 295 | 235 |
| Toronto Marlboros | 62 | 28 | 26 | 8 | 64 | 353 | 304 |
| Kitchener Rangers | 62 | 26 | 32 | 4 | 56 | 267 | 283 |
| Hamilton Red Wings | 62 | 22 | 35 | 5 | 49 | 224 | 328 |
| London Knights | 62 | 19 | 35 | 8 | 46 | 232 | 281 |
| Oshawa Generals | 62 | 18 | 37 | 7 | 46 | 232 | 316 |
| Niagara Falls Flyers | 62 | 11 | 44 | 7 | 29 | 193 | 350 |
Playoffs[]
- Quarterfinals
- St. Catharines - Kitchener 4:0 on series
- Toronto - Peterborough 3:0 on series
- Ottawa - Hamilton 4:2 on series
- Montreal - London 4:0 on series
- Semifinals
- St. Catharines - Montreal 4:2 on series
- Toronto - Ottawa 4:0 on series
- Final
- St. Catharines - Toronto 4:0 on series
St. Catharines advanced to the 1970-71 Eastern Canada Memorial Cup Playoffs.

