| Akademisch-Dramatischer Verein | Akademisch-Dramatischer Verein (Akademische-Dramatische Verein) | 1893 | 4 | |
| Akademi for scenekunst | Akademi for scenekunst | 2006 – 2009 | 5 | |
| Arts Theatre of Cambridge, The | The Arts Theatre of Cambridge | 1936 | 4 | |
| Akademičeskij dramatičeskij teatr im. V. F. Komissarževskoj | Akademičeskij dramatičeskij teatr im. V. F. Komissarževskoj (Komissarzhevskaya Theatre) | 2016 | 1 | |
| Adelaide University Theatre Guild | Adelaide University Theatre Guild | 1960 – 1986 | 5 | |
| Associazione culturale T.E - A.I.A.S.P | Associazione culturale T.E - A.I.A.S.P | 2008 | 4 | |
| Asian Contemporary Arts Festival | Asian Contemporary Arts Festival | 2006 | 1 | |
| Amatørteatret | Amatørteatret | | | |
| Agrupació Peer Gynt | Agrupació Peer Gynt | 1908 | 2 | |
| Australia Council for the Arts | Australia Council for the Arts | 1970 – 1998 | 5 | |
| August-Kurz-Ensemble, Das | Das August-Kurz-Ensemble | 1896 | 2 | |
| Almeida Theatre Company, The | The Almeida Theatre Company | 1990 – 2018 | 5 | |
| Albert Ranfts Sällskap | Albert Ranfts Sällskap | 1885 – 1900 | 21 | |
| Akademičeskij Maly dramatičeskij teatr – Teatr Evropy | Akademičeskij Maly dramatičeskij teatr – Teatr Evropy (Academic Maly Drama Theatre – Theatre of Europe) | 2011 | 1 | |
| Arósio, Garcia & Rangel Produtores e Associados | Arósio, Garcia & Rangel Produtores e Associados | 2001 | 2 | |
| ARTE TV | ARTE TV | 2003 – 2006 | 8 | |
| Agnes Straub | Agnes Straub | 1935 | 1 | |
| Abilene Christian University Department of Theatre | Abilene Christian University Department of Theatre | 2002 | 1 | |
| Atenea | Atenea | 1919 | 1 | |
| American Academy of Dramatic Arts | American Academy of Dramatic Arts | 1907 | 2 | |
| Acting Company Mito Theatre | Acting Company Mito Theatre | 1993 | 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 | |
| Actors Company, The | The Actors Company | 1996 – 2003 | 3 | |
| Artists Repertory Theatre | Artists Repertory Theatre | 2019 | 1 | |
| Allan Holubar | Allan Holubar | 1915 | 1 | |
| Akademischer Studentenverein | Akademischer Studentenverein | 1896 | 1 | |
| Arts Alliance Productions | Arts Alliance Productions | 2006 – 2009 | 11 | |
| Artestudio | Artestudio | 2006 | 1 | |
| Amanti del Teatro Neretino | Amanti del Teatro Neretino | 2024 | 1 | |
| Actors from Christiania Theater | Actors from Christiania Theater | 1867 | 1 | |
| Askepott-Teateret | Askepott-Teateret | 2006 | 7 | |
| August Lindbergs turnéer | August Lindbergs turnéer | 1887 – 1897 | 37 | |
| Asociación Obrera de Teatro | Asociación Obrera de Teatro | 1927 | 2 | |
| Arts Victoria | Arts Victoria | 1998 | 1 | |
| Abbey Theatre | Abbey Theatre | 2005 – 2023 | 4 | 1 |
| Agder Teater | Agder Teater | 1993 – 2015 | 70 | 7 |
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