The Ontario Lassie Stakes is a Canadian Thoroughbred horse race run annually at Woodbine Racetrack in Toronto, Ontario. Open to Ontario-bred two-year-old fillies, it is contested on Polytrack synthetic dirt over a distance of 1+1⁄16 miles (8.5 furlongs). Inaugurated at Toronto's Greenwood Raceway in 1979, it was raced there through 1993 at a distance of one mile. In 1994, the race was moved to Woodbine Racetrack and set at 1+1⁄16 miles. The Ontario Lassie Stakes was run in two divisions in 1995.