| (UMBC) University of Maryland Baltimore County | Knollview, United States | CompanyView profile |
| 23Arts | United States | CompanyView profile |
| 360° of Opera | United States | CompanyView profile |
| 9. Muenchner Open Air Sommer, Brunnenhof/Residenz | Munich, Germany | CompanyView profile |
| A.T.A. Teatro Regionale Alessandrino - TEATRO ALESSANDRINO | Alessandria, Italy | CompanyView profile |
| Aalborg Teater | Aalborg, Denmark | CompanyView profile |
| Aalto-Musiktheater Essen | Essen, Germany | CompanyView profile |
| Aardklop Nasionale Kunstefees | Potchefstroom, South Africa | CompanyView profile |
| Aarhus Teater | Aarhus, Denmark | CompanyView profile |
| ABAO Bilbao Opera | Bilbao, Spain | CompanyView profile |
| Abilene Opera | Abilene, United States | CompanyView profile |
| Abu Dhabi Classics | Abu Dhabi, United Arab Emirates | CompanyView profile |
| Academia Montis Regalis | Mondovi, Italy | CompanyView profile |
| Academic Choir and Academic Orchestra of the University of Stuttgart | Stuttgart, Germany | CompanyView profile |
| Academy of the Holy Spirit | Turin, Italy | CompanyView profile |
| Académie baroque européenne d'Ambronay | Ambronay, France | CompanyView profile |
| Acapela Studios | United Kingdom | CompanyView profile |
| Accademia Acquaviva | Giulianova, Italy | CompanyView profile |
| Accademia di Belle Arti di Carrara | Carrara, Italy | CompanyView profile |
| Accademia di Belle Arti di Venezia | Venice, Italy | CompanyView profile |
