
| Name | Show | Role Size | Age | Gender | Voice |
| Aeneas | Dido and Aeneas | lead | 25 - 35 | male | tenor |
| Aeneus | Troilus and Cressida | supporting | 30 - 50 | male | spoken |
| Aennchen | Der Freischütz (The Freeshooter) | supporting | 15 - 25 | female | mezzo |
| Aerialist | Carnival | cameo | - | male | |
| Aeschylus | The Frogs | supporting | 35 - 65 | male | spoken |
| African Drummer | Raisin | cameo | - | male | |
| Agamemnnon | La belle Hélène (The Beautiful Helen) | supporting | 45 - 75 | male | bass-baritone |
| Agamemnon | The Golden Apple | N/A | - | male | |
| Agamemnon | Agamemnon | lead | 30 - 45 | male | spoken |
| Agamemnon | War Music | lead | 20 - 40 | male | spoken |
| Agamemnon | Troilus and Cressida | supporting | 30 - 50 | male | spoken |
| Agamemnon | Iphigénie en Tauride | lead | 40 - 60 | male | baritone |
| Agatha | Guys and Dolls | cameo | 40 - 65 | female | mezzo |
| Agatha | Der Freischütz (The Freeshooter) | lead | 18 - 30 | female | soprano |
| Agatha De Lacey | Frankenstein | cameo | 10 - 15 | female | spoken |
| Agatha Wylie | SMASH | supporting | 20 - 25 | female | spoken |
| Agave | The Bacchae | supporting | 40 - 65 | female | spoken |
| Agenore | Il re pastore (The Shepherd King) | lead | 30 - 40 | male | tenor |
| Agent | The Dining Room | supporting | 20 - 30 | female | spoken |
| Aggie | The Dining Room | supporting | 19 - 25 | female | spoken |