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.
Established in 1776, the St Leger is the oldest of Britain's five Classic races. It is the last of the five to be run each year, and its distance is longer than any of the other four.
The St Leger is the final leg of the English Triple Crown, which begins with the 2000 Guineas and continues with the Derby. It also completes the Fillies Triple Crown, following on from the 1000 Guineas and The Oaks.