Fantasio is an 1872 opéra comique in 3 acts, 4 tableaux with music by Jacques Offenbach. The French libretto by Paul de Musset was closely based on the 1834 play of the same name by his brother Alfred de Musset. The opera found little success in Offenbach's lifetime, was revived in the 1930s and performed in a critical edition in the 2000s.