The Prix du Palais-Royal is a Group 3 flat horse race in France open to thoroughbreds aged three years or older. It is run at Longchamp over a distance of 1,400 metres (about 7 furlongs), and it is scheduled to take place each year in late May or early June.
The event is named after the Palais-Royal, a palace and an associated garden located in Paris. The race was established in 1968, and with one exception — the 1996 running at Deauville — it has always taken place at Longchamp. Its distance has remained at 1,400 metres since its creation.
For several years before its launch there was an event titled the Prix Palais Royal at Saint-Cloud. This was named after a racehorse called Palais Royal, the winner of the Cambridgeshire Handicap and runner-up in the St Leger in 1928.