| 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 | |
| American Academy of Dramatic Arts | American Academy of Dramatic Arts | 1907 | 2 | |
| Artisti Riuniti | Artisti Riuniti | 2008 | 1 | |
| ARTE TV | ARTE TV | 2003 – 2006 | 8 | |
| Apollinaire Theatre Company | Apollinaire Theatre Company | 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 | |
| Actors Company, The | The Actors Company | 1996 – 2003 | 3 | |
| 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 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 | |
| Amanti del Teatro Neretino | Amanti del Teatro Neretino | 2024 | 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 | |
| Asociación Obrera de Teatro | Asociación Obrera de Teatro | 1927 | 2 | |
| Arts Victoria | Arts Victoria | 1998 | 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 | |
| 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 | |
| Assitej-festivalen | Assitej-festivalen | 1992 – 1993 | 3 | |
| August Lindbergs Sällskap | August Lindbergs Sällskap | 1883 – 1896 | 92 | |
| Agrupament literari ‘Henrik Ibsen’ | Agrupament literari ‘Henrik Ibsen’ | 1904 | 1 | |
| Arts Theatre Club | Arts Theatre Club | 1930 – 1931 | 6 | |
| Artcraft Photoplay | Artcraft Photoplay | 1918 | 1 | |
| Almasi Collaborative Arts | Almasi Collaborative Arts | 2025 | 1 | |
| Amsterdamsch Lyrisch Tooneel | Amsterdamsch Lyrisch Tooneel | 1902 | 1 | |
| Athens Festival | Athens Festival | 2006 – 2010 | 2 | |
| Associate Players | Associate Players | 1922 | 2 | |
| Associazione Culturale 'Gianni Santuccio' | Associazione Culturale 'Gianni Santuccio' | 2000 – 2020 | 5 | |
| August Rasmussens Teaterselskab | August Rasmussens Teaterselskab | 1876 – 1878 | 16 | |
| Akademiske Kvarter, Det | Det Akademiske Kvarter | 2025 | 1 | |
| Albert u. Else Bassermann | Albert u. Else Bassermann | 1933 – 1950 | 13 | |
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