| 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 | 85 | |
| Athens Festival | Athens Festival | 2006 – 2010 | 2 | |
| Atenea | Atenea | 1919 | 1 | |
| Associazione culturale T.E - A.I.A.S.P | Associazione culturale T.E - A.I.A.S.P | 2008 | 4 | |
| Associazione Culturale 'Gianni Santuccio' | Associazione Culturale 'Gianni Santuccio' | 2000 – 2020 | 5 | |
| 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 | |
| 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 Alliance Productions | Arts Alliance Productions | 2006 – 2009 | 11 | |
| Artestudio | Artestudio | 2006 | 1 | |
| Artéria Színházi Társaság | Artéria Színházi Társaság | 2003 – 2004 | 4 | |
| ARTE TV | ARTE TV | 2003 – 2006 | 8 | |
| Artcraft Photoplay | Artcraft Photoplay | 1918 | 1 | |
| Arósio, Garcia & Rangel Produtores e Associados | Arósio, Garcia & Rangel Produtores e Associados | 2001 | 2 | |
| Ariels, The | The Ariels | 2010 | 1 | |
| Arendalsuka | Arendalsuka | 2013 | 1 | |
| Arendals Dramatiske Selskab | Arendals Dramatiske Selskab | 2011 | 1 | |
| Arendal Ballett Center | Arendal Ballett Center | 2010 | 1 | |
| Amsterdamsch Lyrisch Tooneel | Amsterdamsch Lyrisch Tooneel | 1902 | 1 | |
| American Ibsen Theater | American Ibsen Theater | 1983 – 1985 | 5 | |
| American Conservatory Theater | American Conservatory Theater | 1973 – 2007 | 8 | |
| American Academy of Dramatic Arts | American Academy of Dramatic Arts | 1907 | 2 | |
| Amatørteatret | Amatørteatret | | | |
| Almeida Theatre Company, The | The Almeida Theatre Company | 1990 – 2018 | 5 | |
| Allan Holubar | Allan Holubar | 1915 | 1 | |
| Alireza Kooshk Jalali?s Company | Alireza Kooshk Jalali's Company (Alireza Kooshk Jalali?s Company) | 2010 | 1 | |
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