In Greek mythology, Theonoe is a name that may refer to:

• A daughter of the prophet Thestor, sister to Calchas and Leucippe. Her story, told by Hyginus, is as follows.

Théonoé is an opera by the French composer Joseph François Salomon, first performed at the Académie Royale de Musique (the Paris Opera) on 3 December 1715. It takes the form of a tragédie en musique in a prologue and five acts. The libretto is by Simon-Joseph Pellegrin, using the pseudonym "La Roque".