| Role | Voice Part | Classification |
|---|---|---|
| Thais | Soprano | L |
| Athanael | Baritone | L |
| Nicias | Tenor | F |
| Palemon | Bass | S |
| Albine | Contralto | S |
| Crobyle | Soprano | S |
| Myrtale | Mezzo-Soprano | S |
| La Charmeuse | High Col. Soprano | S |
| Slave (Servant) | Baritone | B |
| 5 Cenobites | Tenors, Bass-Baritones | CB |
| Minimum Chorus: 24 | ||
| Divisi: SATB |