L'Orione (Orion) is an opera in three acts and a prologue by the Italian composer Francesco Cavalli with a libretto by . It was first performed at the Royal Palace of Milan, in June 1653[1] to celebrate the election of Ferdinand IV as King of the Romans. The libretto had originally been written for the Teatro San Moisè, Venice, in 1642. Orione was revived in Santa Fe, New Mexico, in 1983 by the conductor and musicologist Raymond Leppard.
| Orione, the hunter | Tenor / C1 | |
| Diana, goddess of the hunt | mezzo-soprano / C1 | |
| Aurora, goddess of the daw | mezzo-soprano / F4 | |
| Castore | C1 | |
| Ercole | F4 | |
| Taumanti | C3 | |
| Filotero, Orione's companion | baritone / F4 | |
| Vulcano, god of fire | bass / F4 | |
| Bronte, a Cyclops | F4 | |
| Sterope, a Cyclops | C4 | |
| Apollo, sun god, brother of Diana | tenor | |
| Venere, goddess of love | mezzo-soprano / C3 | |
| Amor, Cupid, son of Venus | soprano / C1 | |
| Giove, father of the gods | tenor | |
| Titone, a mortal, husband of Aurora | baritone | |
| Nettuno, god of the sea | bass | |
| Caronte | ||
| Pluto | ||
| Vecchia | ||
| Una ninfa dell'Aurora | ||
| Due ninfi di Diana | both / C1 |