| Seattle Opera | | | |
| Gary Thor Wedow | Conductor | | |
| Tomer Zvulun | Director | | |
| Erhard Rom | Set Designer | | |
| Victoria "Vita" Tzykun | Costume Designer | | |
| Brenda Rae | Soprano | Semele | 2015 Feb 21, 25, 28, Mar 04, 07 |
| Mary Feminear | Soprano | Semele | 2015 Feb 22 mat, Mar 06 |
| Stephanie Blythe | Mezzo-soprano | Ino | 2015 Feb 21, 25, 28, Mar 04, 07 |
| Deborah Nansteel | Mezzo-soprano | Ino | 2015 Feb 22 mat, Mar 06 |
| John Del Carlo | Bass | Somnus | |
| Randall Scotting | Countertenor | Athamas | |
| Amanda Forsythe | Soprano | Iris | |
| Alek Shrader | Tenor | Jupiter | 2015 Feb 21, 25, 28, Mar 04, 07 |
| Theo Lebow | Tenor | Jupiter | 2015 Feb 22 mat, Mar 06 |