| Aarohan Theatre Group | Aarohan Theatre Group | 2003 – 2007 | 11 | |
| Azad Teater | Azad Teater | 1992 | 1 | |
| Australian Elizabethan Theatre Trust, The | The Australian Elizabethan Theatre Trust | 1970 | 3 | |
| Australia Council for the Arts | Australia Council for the Arts | 1970 – 1998 | 5 | |
| August-Kurz-Ensemble, Das | Das August-Kurz-Ensemble | 1896 | 2 | |
| August Sandberg Sällskap | August Sandberg Sällskap | 1878 – 1880 | 5 | |
| August Rasmussens Teaterselskab | August Rasmussens Teaterselskab | 1876 – 1878 | 16 | |
| August Lindbergs turnéer | August Lindbergs turnéer | 1887 – 1897 | 37 | |
| August Lindbergs Sällskap | August Lindbergs Sällskap | 1883 – 1896 | 92 | |
| Attic Collective, The | The Attic Collective | 2023 | 1 | |
| Athens Festival | Athens Festival | 2006 – 2010 | 2 | |
| Ateneul Tătăraşi | Ateneul Tătăraşi | 2011 | 1 | |
| Atenea | Atenea | 1919 | 1 | |
| ATE: Associazione Teatro Europa | ATE: Associazione Teatro Europa | 2011 – 2013 | 4 | 2 |
| Associazione TLLT - Teatro Libero Liberi Teatri | Associazione TLLT - Teatro Libero Liberi Teatri | 2015 | 1 | 1 |
| Associazione TeRRRe | Associazione TeRRRe | 2019 | 3 | 3 |
| Associazione la Maddalena | Associazione la Maddalena | 1975 | 1 | 1 |
| Associazione culturale T.E - A.I.A.S.P | Associazione culturale T.E - A.I.A.S.P | 2008 | 4 | |
| Associazione Culturale Nati Domani | Associazione Culturale Nati Domani | 2021 | 1 | 1 |
| Associazione Culturale Fuoridaltunnel | Associazione Culturale Fuoridaltunnel | 2023 | 2 | 1 |
| Associazione culturale Extravagarte | Associazione culturale Extravagarte | 2005 – 2022 | 6 | 2 |
| Associazione Culturale 'Gianni Santuccio' | Associazione Culturale 'Gianni Santuccio' | 2000 – 2020 | 5 | |
| Associazione Coro e Orchestra Desiderio da Settignano | Associazione Coro e Orchestra Desiderio da Settignano | 2009 | 1 | |
| Association Franco-Norvégienne | Association Franco-Norvégienne | 1929 | 1 | |
| Associate Players | Associate Players | 1922 | 2 | |
| Assitej-festivalen | Assitej-festivalen | 1992 – 1993 | 3 | |
| Assitej World Congres | Assitej World Congres | 1999 | 1 | |
| Asociación Obrera de Teatro | Asociación Obrera de Teatro | 1927 | 2 | |
| Askø Artist | Askø Artist | 2010 | 1 | |
| Askepott-Teateret | Askepott-Teateret | 2006 | 7 | |
| Asian Contemporary Arts Festival | Asian Contemporary Arts Festival | 2006 | 1 | |
| ARW Prosjektteater | ARW Prosjektteater | 2006 | 4 | |
| Arts Victoria | Arts Victoria | 1998 | 1 | |
| Arts Theatre of Cambridge, The | The Arts Theatre of Cambridge | 1936 | 4 | |
| Arts Theatre Club | Arts Theatre Club | 1930 – 1931 | 6 | |
| Arts and Entertainment Atlanta | Arts and Entertainment Atlanta | 2024 | 1 | |
| Arts Alliance Productions | Arts Alliance Productions | 2006 – 2009 | 11 | |
| Artists Repertory Theatre | Artists Repertory Theatre | 2019 | 1 | |
| Artisti Riuniti | Artisti Riuniti | 2008 | 1 | |
| Artestudio | Artestudio | 2006 | 1 | |
| Artéria Színházi Társaság | Artéria Színházi Társaság | 2003 – 2004 | 4 | |
| ARTE TV | ARTE TV | 2003 – 2006 | 8 | |
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