The St Leger Stakes is a Group 1 flat horse race in Great Britain open to three-year-old thoroughbred colts and fillies.

It is run at Doncaster over a distance of 1 mile, 6 furlongs and 115 yards (2,921 metres), and it is scheduled to take place each year in September.

The St Leger is the final leg of the English Triple Crown, which begins with the 2000 Guineas and continues with the Derby.

The event was devised by Anthony St Leger, an army officer and politician who lived near Doncaster.

The title St Leger Stakes was decided at a dinner party held in 1778 at the Red Lion Inn located in the Market Place, Doncaster, to discuss the coming year's race.

The St Leger Stakes has inspired a number of similar events around the world, although many are no longer restricted to three-year-olds.