| Assitej World Congres | Assitej World Congres | 1999 | 1 | |
| Agrupació Avenir | Agrupació Avenir | 1905 | 1 | |
| ArtsEd | ArtsEd | 2025 | 1 | |
| Antrepriza D. I. Basmanova | Antrepriza D. I. Basmanova (D. I. Basmanov's Enterprise) | 1907 | 1 | |
| Association Franco-Norvégienne | Association Franco-Norvégienne | 1929 | 1 | |
| Artists Collaborative Theatre | Artists Collaborative Theatre | 2025 | 1 | |
| Adelaide Festival of Arts | Adelaide Festival of Arts | 2006 | 1 | |
| Albert Ranfts dramatiska turné | Albert Ranfts dramatiska turné | 1919 | 1 | |
| Associazione TLLT - Teatro Libero Liberi Teatri | Associazione TLLT - Teatro Libero Liberi Teatri | 2015 | 1 | 1 |
| Azad Teater | Azad Teater | 1992 | 1 | |
| Athinaiki Skini | Athinaiki Skini (Athenian Stage) | 2025 | 1 | |
| Antiklimax | Antiklimax | 2022 | 1 | |
| Arendal Ballett Center | Arendal Ballett Center | 2010 | 1 | |
| Akademičeskij dramatičeskij teatr im. V. F. Komissarževskoj | Akademičeskij dramatičeskij teatr im. V. F. Komissarževskoj (Komissarzhevskaya Theatre) | 2016 | 1 | |
| Associazione Coro e Orchestra Desiderio da Settignano | Associazione Coro e Orchestra Desiderio da Settignano | 2009 | 1 | |
| Arts Club Theatre Company | Arts Club Theatre Company | 2025 | 1 | |
| Asian Contemporary Arts Festival | Asian Contemporary Arts Festival | 2006 | 1 | |
| Akademičeskij Maly dramatičeskij teatr – Teatr Evropy | Akademičeskij Maly dramatičeskij teatr – Teatr Evropy (Academic Maly Drama Theatre – Theatre of Europe) | 2011 | 1 | |
| Argot produzioni | Argot produzioni | 2012 | 1 | 1 |
| Alan Kadıköy | Alan Kadıköy | 2025 | 1 | |
| Amatørteatret | Amatørteatret | | | |
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