The Prix Maurice de Nieuil is a Group 2 flat horse race in France open to thoroughbreds aged four years or older.

It was named in honour of the French and Allied marshals (maréchaux) who served in World War I.

The Prix des Maréchaux was cancelled in 1940, and for a period thereafter it was held at Longchamp (1941 – 42, 1944 – 45), Le Tremblay (1943) and Maisons-Laffitte (1946).

This was in memory of Maurice de Nieuil (1860 –1949), a former chairman of the Société Sportive d'Encouragement, one of the precursors of France Galop.

The event moved to Longchamp in 2006, and it is now part of the Grand Prix de Paris meeting.