Amadis or Amadis de Gaule (Amadis of Gaul) is a tragédie en musique in a prologue and five acts by Jean-Baptiste Lully to a libretto by Philippe Quinault based on Nicolas Herberay des Essarts' adaptation of Garci Rodríguez de Montalvo's Amadis de Gaula. It was premiered by the Paris Opera at the Théâtre du Palais-Royal sometime from January 15 to 18, 1684. There was a later production at Versailles without scenery or machines in 1685.

Amadis was the first tragédie en musique to be based on chivalric rather than mythological themes; Lully's last three completed operas followed in this course. Louis XIV of France chose the theme. In the dance troupe the principal male dancers were Pierre Beauchamp, Louis-Guillaume Pécour and Lestang, and the principal female dancers were La Fontaine, Carré and Pesan. There were eight revivals of the opera in Paris between 1687 and 1771. Between 1687 and 1729 it was produced in Amsterdam, The Hague, Marseille, Rouen, Brussels, Lunéville, Lyon, and Dijon. Today the most famous aria from Amadis is Amadis' much anthologized monologue from act two, "Bois épais". At the beginning of the same act Arcabonne sings "Amour, que veux-tu de moy?", as once did ‘every cook in France’, according to Le Cerf de la Viéville (Comparaison, 1704–6)