(in order of appearance)
| Nurse: | a servant of Medea’s household |
| Tutor: | a servant of Jason, he tends the children |
| Medea: | the foreign-born wife and accomplice of Jason |
| Chorus of Corinthian Women: | women of the city |
| Creon: | king of Corinth |
| Jason: | Greek hero, leader of the Argonauts |
| Aegeus: | king of Athens |
| Messenger: | a servant of Jason’s household |