Demofonte (also Demofoonte; Il Demofoonte; Demofoonte, ré di Tracia [King of Thrace]; Démophon; Demophontes; or Dirce, L'usurpatore innocente [Dirce, the Innocent Usurper]) is an opera seria libretto by Metastasio. The libretto was first set by Antonio Caldara in 1733, but remained popular throughout the eighteenth century and was set over seventy times.