Ontario Derby
| Norcliffe, painted by Bob Demuyser (1920–2003) | |
| Class | Grade III | 
|---|---|
| Location | Woodbine Racetrack Toronto, Ontario | 
| Inaugurated | 1972 | 
| Race type | Thoroughbred – Flat racing | 
| Website | www | 
| Race information | |
| Distance | 1+1⁄8 miles (9 furlongs) | 
| Surface | Tapeta synthetic dirt | 
| Track | Left-handed | 
| Qualification | Three-year-olds | 
| Weight | Allowances | 
| Purse | Can$150,000 (2015) | 
The Ontario Derby is a Canadian Thoroughbred horse race run annually in mid-October at Woodbine Racetrack in Toronto, Ontario. A Grade III stakes since 2012, it is open to three-year-old horses. Raced over a distance of 1+1⁄8 miles (9 furlongs) on Tapeta, the Ontario Derby currently offers a purse of Can$150,000.
Inaugurated in 1972 as the Colonel R. S. McLaughlin Handicap, the race was renamed the Ontario Derby for the 2003 running. Originally contested at 1+3⁄16 miles, it was changed to its current 1+1⁄8-mile distance in 1992.