| Almeida Theatre Company, The | The Almeida Theatre Company | 1990 – 2018 | 5 | |
| Atenea | Atenea | 1919 | 1 | |
| American Academy of Dramatic Arts | American Academy of Dramatic Arts | 1907 | 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 | |
| Actors Company, The | The Actors Company | 1996 – 2003 | 3 | |
| 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 | |
| Artestudio | Artestudio | 2006 | 1 | |
| Allan Holubar | Allan Holubar | 1915 | 1 | |
| Akademischer Studentenverein | Akademischer Studentenverein | 1896 | 1 | |
| Arts Alliance Productions | Arts Alliance Productions | 2006 – 2009 | 11 | |
| August Lindbergs turnéer | August Lindbergs turnéer | 1887 – 1897 | 37 | |
| Attic Collective, The | The Attic Collective | 2023 | 1 | |
| Arts Victoria | Arts Victoria | 1998 | 1 | |
| Actors from Christiania Theater | Actors from Christiania Theater | 1867 | 1 | |
| Askepott-Teateret | Askepott-Teateret | 2006 | 7 | |
| August Lindbergs Sällskap | August Lindbergs Sällskap | 1883 – 1896 | 85 | |
| Agrupació Avenir | Agrupació Avenir | 1905 | 1 | |
| Alireza Kooshk Jalali's Company | Alireza Kooshk Jalali's Company (Alireza Kooshk Jalali?s Company) | 2010 | 1 | |
| Ariels, The | The Ariels | 2010 | 1 | |
| Assitej-festivalen | Assitej-festivalen | 1992 – 1993 | 3 | |
| Associate Players | Associate Players | 1922 | 2 | |
| Arts Theatre Club | Arts Theatre Club | 1930 – 1931 | 6 | |
| Artcraft Photoplay | Artcraft Photoplay | 1918 | 1 | |
| Amsterdamsch Lyrisch Tooneel | Amsterdamsch Lyrisch Tooneel | 1902 | 1 | |
| Athens Festival | Athens Festival | 2006 – 2010 | 2 | |
| Abbey Theatre | Abbey Theatre | 2005 – 2023 | 4 | 1 |
| Agder Teater | Agder Teater | 1993 – 2015 | 70 | 7 |
|
|
