| Class: | Restricted stakes |
| Horse Race: | Ontario Lassie Stakes |
| Location: | Woodbine Racetrack Toronto, Ontario, Canada |
| Inaugurated: | 1979 |
| Race Type: | Thoroughbred - Flat racing |
| Distance: | miles (8.5 furlongs) |
| Surface: | Polytrack synthetic dirt |
| Track: | left-handed |
| Qualification: | Ontario-bred two-year-old fillies |
| Purse: | $131,385 |
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 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 miles.
The Ontario Lassie Stakes was run in two divisions in 1995.
Speed record:
Most wins by an owner:
Most wins by a jockey:
Most wins by a trainer:
| Year | Winner | Jockey | Trainer | Owner | Time |
|---|---|---|---|---|---|
| 2016 | Ellan Vannin | Jeffrey Alderson | Tony M. Gattellaro | Jon Lee | 1:45.05 |
| 2015 | Sparkles' Girl | Emma-Jayne Wilson | John Charalambous | C. E. C. Farm | 1:45.82 |
| 2014 | London Tower | Emma-Jayne Wilson | Steve Owens | Steve Owens | 1:44.73 |
| 2013 | Paladin Bay | Gerry Olguin | Harold Ladouceur | Jessie Ladouceur | 1:47.62 |
| 2012 | Aunt Els | Justin Stein | Norman McKnight | R.M.C. Stable | 1:46.17 |
| 2011 | Dixie Strike | Patrick Husbands | Mark Casse | John C. Oxley | 1:44.92 |
| 2010 | Inglorious | Chantal Sutherland | Josie Carroll | Donver Stable | 1:46.28 |
| 2009 | Resentless | Chantal Sutherland | Ian Howard | Donald Ross | 1:43.98 |
| 2008 | Milwaukee Appeal | Na Somsanith | Scott H. Fairlie | C. E. C. Farms | 1:45.43 |
| 2007 | Krz Exec | Jerry Baird | Michael P. DePaulo | Sylon Stable & partner | 1:46.19 |
| 2006 | Palace Pier | Todd Kabel | Darwin Banach | William A. Sorokolit, Sr. | 1:46.69 |
| 2005 | Our Madison | Emma-Jayne Wilson | Joseph H. Johnson | Kenneth Sawatzky | 1:49.26 |
| 2004 | Silver Impulse | Emile Ramsammy | Stanley Baresich | B. & B. Stable & Winston Penny | 1:47.46 |
| 2003 | Six Sexy Sisters | Patrick Husbands | Mike Keogh | Gus Schickedanz | 1:47.26 |
| 2002 | Brattothecore | Jake Barton | John A. Ross | Jam Jar Racing Stable | 1:47.80 |
| 2001 | What A Breeze | Jake Barton | Earl Barnett | Hopefield Farm | 1:46.34 |
| 2000 | Poetically | David Clark | Roger Attfield | Kinghaven Farms | 1:46.05 |
| 1999 | Inspired Kiss | Todd Kabel | Thomas O'Keefe | Caroga Stables & Wings of Erin Farm | 1:45.32 |