The Grand Prix de Chantilly is a Group 2 flat horse race in France open to thoroughbreds aged four years or older. It is run at Chantilly over a distance of 2,400 metres (about 1½ miles), and it is scheduled to take place each year in late May or early June.The event replaced the Grand Prix d'Évry, a race established when Évry Racecourse opened in 1973.