The Longchamp Racecourse (French: Hippodrome de Longchamp, pronounced [ipɔdʁom də lɔ̃ʃɑ̃]) is a 57 hectare horse-racing facility located on the Route des Tribunes at the Bois de Boulogne in the 16th arrondissement of Paris, France.

It is used for flat racing and is noted for its variety of interlaced tracks and a famous hill that provides a real challenge to competing thoroughbreds.

The Emperor Napoleon III and his wife Eugénie were present, having sailed down the Seine River on their private yacht to watch the third race.

Until 1930, many Parisians came to the track down the river on steamboats and various other vessels, the trip taking around an hour to the Pont de Suresnes.

Non-aristocratic members of the upper classes were not permitted into the Royal Enclosure and had to be content with watching from their barouche carriages on the lawn.