The Commonwealth Cup is a Group 1 flat horse race in Great Britain open to colts and fillies aged three years.
It is run at Ascot over a distance of 6 furlongs (1,207 metres), and it is scheduled to take place each year in June.
The Commonwealth Cup was introduced in 2015 as part of changes to the programme of sprint horse races in Europe.
The Diamond Jubilee Stakes, run over the same course and distance at the same meeting, was closed to three-year-olds at the same time.
It was the only Group 1 flat race in Great Britain exclusively for three-year-olds that allowed geldings to compete and the first age-restricted Group 1 race which was open to geldings in Europe.