| Amatørteatret | Amatørteatret | | | |
| Akademičeskij dramatičeskij teatr im. V. F. Komissarževskoj | Akademičeskij dramatičeskij teatr im. V. F. Komissarževskoj (Komissarzhevskaya Theatre) | 2016 | 1 | |
| Arts Club Theatre Company | Arts Club Theatre Company | 2025 | 1 | |
| Asian Contemporary Arts Festival | Asian Contemporary Arts Festival | 2006 | 1 | |
| Associazione Coro e Orchestra Desiderio da Settignano | Associazione Coro e Orchestra Desiderio da Settignano | 2009 | 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 | |
| Agnes Straub | Agnes Straub | 1935 | 1 | |
| Abilene Christian University Department of Theatre | Abilene Christian University Department of Theatre | 2002 | 1 | |
| Atenea | Atenea | 1919 | 1 | |
| Artisti Riuniti | Artisti Riuniti | 2008 | 1 | |
| Apollinaire Theatre Company | Apollinaire Theatre Company | 2025 | 1 | |
| Akademischer Verein für Kunst und Litteratur | Akademischer Verein für Kunst und Literatur (Akademischer Verein für Kunst und Litteratur) | 1902 | 1 | |
| Arendals Dramatiske Selskab | Arendals Dramatiske Selskab | 2011 | 1 | |
| Artists Repertory Theatre | Artists Repertory Theatre | 2019 | 1 | |
| Acting Company Mito Theatre | Acting Company Mito Theatre | 1993 | 1 | |
| Arts and Entertainment Atlanta | Arts and Entertainment Atlanta | 2024 | 1 | |
| Akademischer Studentenverein | Akademischer Studentenverein | 1896 | 1 | |
| Artestudio | Artestudio | 2006 | 1 | |
| Amanti del Teatro Neretino | Amanti del Teatro Neretino | 2024 | 1 | |
| Allan Holubar | Allan Holubar | 1915 | 1 | |
| Antaeus Theatre Company | Antaeus Theatre Company | 2024 | 1 | |
| Arts Victoria | Arts Victoria | 1998 | 1 | |
| Actors from Christiania Theater | Actors from Christiania Theater | 1867 | 1 | |
| Agrupament literari ‘Henrik Ibsen’ | Agrupament literari ‘Henrik Ibsen’ | 1904 | 1 | |
| Alireza Kooshk Jalali's Company | Alireza Kooshk Jalali's Company (Alireza Kooshk Jalali?s Company) | 2010 | 1 | |
| Ariels, The | The Ariels | 2010 | 1 | |
| Albion College Theatre | Albion College Theatre | 2025 | 1 | |
| Amsterdamsch Lyrisch Tooneel | Amsterdamsch Lyrisch Tooneel | 1902 | 1 | |
| Artcraft Photoplay | Artcraft Photoplay | 1918 | 1 | |
| Almasi Collaborative Arts | Almasi Collaborative Arts | 2025 | 1 | |
| Arendalsuka | Arendalsuka | 2013 | 1 | |
| Associazione la Maddalena | Associazione la Maddalena | 1975 | 1 | 1 |
| Akademiske Kvarter, Det | Det Akademiske Kvarter | 2025 | 1 | |
| Agnes Sorma und die Irving Place Theatergesellschaft, N.Y. | Agnes Sorma und die Irving Place Theatergesellschaft, N.Y. | 1898 | 1 | |
| Askø Artist | Askø Artist | 2010 | 1 | |
| Ateneul Tătăraşi | Ateneul Tătăraşi | 2011 | 1 | |
| Ambasciata Norvegese in Italia | Ambasciata Norvegese in Italia | 2020 | 1 | |
| AGADU | AGADU | 1999 | 1 | |
| Attic Collective, The | The Attic Collective | 2023 | 1 | |
| Assitej World Congres | Assitej World Congres | 1999 | 1 | |
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