Amadis is an opera in three acts with prologue by Jules Massenet to a French libretto by Jules Claretie based on the Spanish knight-errantry romance Amadis de Gaula, originally of Portuguese origin, by Garci Rodríguez de Montalvo.

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 at the Paris Opéra January 18 1684. There was a later production at Versailles without machines in 1685.