Cadmus et Hermione is a tragédie en musique in a prologue and five acts by Jean-Baptiste Lully.
The prologue, in praise of King Louis XIV, represents him as Apollo slaying the Python of Delphi.
The opera itself concerns the love story of Cadmus, legendary founder and king of Thebes, Greece, and Hermione (Harmonia), daughter of Venus and Mars.
A contemporary transcription of the overture by Jean-Henri d'Anglebert remains a possible part of the harpsichord repertoire.
In early 2008, the French ensemble Le Poème Harmonique staged a performance of the opera in Paris and Rouen, among other places.