Esclarmonde (French pronunciation: ​[ɛsklaʁmɔ̃d]) is an opéra (French: opéra romanesque) in four acts and eight tableaux, with prologue and epilogue, by Jules Massenet, to a French libretto by Alfred Blau and Louis Ferdinand de Gramont. It was first performed on May 15, 1889 by the Opéra-Comique at the Théâtre Lyrique on the Place du Châtelet in Paris with American soprano Sibyl Sanderson in the title role in her professional debut. The original costumes were by Charles Bianchini, the sets by Antoine Lavastre and Eugène Carpezat, and Amable and Eugène Gardy.