(in order of appearance)
| Hermes: | messenger of the gods |
| Ion: | son of Apollo and Creusa (unbeknownst to him) |
| Chorus of Athenians: | women who serve Creusa |
| Creusa: | princess of Athens, daughter of Erechtheus |
| Xuthus: | husband of Creusa |
| Old Man: | servant of Creusa |
| Priestess: | woman who serves Apollo |
| Athena: | patron goddess of Athens |