| Ambasciata Norvegese in Italia | Ambasciata Norvegese in Italia | 2020 | 1 | |
| American Academy of Dramatic Arts | American Academy of Dramatic Arts | 1907 | 2 | |
| American Conservatory Theater | American Conservatory Theater | 1973 – 2007 | 8 | |
| American Ibsen Theater | American Ibsen Theater | 1983 – 1985 | 6 | |
| Amsterdamsch Lyrisch Tooneel | Amsterdamsch Lyrisch Tooneel | 1902 | 1 | |
| Antaeus Theatre Company | Antaeus Theatre Company | 2024 | 1 | |
| Antiklimax | Antiklimax | 2022 | 1 | |
| Antrepriza D. I. Basmanova | Antrepriza D. I. Basmanova (D. I. Basmanov's Enterprise) | 1907 | 1 | |
| Apollinaire Theatre Company | Apollinaire Theatre Company | 2025 | 1 | |
| Archivio Zeta | Archivio Zeta | 2013 – 2014 | 8 | 1 |
| Arendal Ballett Center | Arendal Ballett Center | 2010 | 1 | |
| Arendals Dramatiske Selskab | Arendals Dramatiske Selskab | 2011 | 1 | |
| Arendalsuka | Arendalsuka | 2013 | 1 | |
| Argot produzioni | Argot produzioni | 2012 | 1 | 1 |
| Ariels, The | The Ariels | 2010 | 1 | |
| Arósio, Garcia & Rangel Produtores e Associados | Arósio, Garcia & Rangel Produtores e Associados | 2001 | 2 | |
| Artcraft Photoplay | Artcraft Photoplay | 1918 | 1 | |
| ARTE TV | ARTE TV | 2003 – 2006 | 8 | |
| Artéria Színházi Társaság | Artéria Színházi Társaság | 2003 – 2004 | 4 | |
| Artestudio | Artestudio | 2006 | 1 | |
| Artisti Riuniti | Artisti Riuniti | 2008 | 1 | |
| Artists Collaborative Theatre | Artists Collaborative Theatre | 2025 | 1 | |
| Artists Repertory Theatre | Artists Repertory Theatre | 2019 | 1 | |
| Arts Alliance Productions | Arts Alliance Productions | 2006 – 2009 | 11 | |
| Arts and Entertainment Atlanta | Arts and Entertainment Atlanta | 2024 | 1 | |
| Arts Club Theatre Company | Arts Club Theatre Company | 2025 | 1 | |
| Arts Theatre Club | Arts Theatre Club | 1930 – 1931 | 6 | |
| Arts Theatre of Cambridge, The | The Arts Theatre of Cambridge | 1936 | 4 | |
| Arts Victoria | Arts Victoria | 1998 | 1 | |
| ArtsEd | ArtsEd | 2025 | 1 | |
| ARW Prosjektteater | ARW Prosjektteater | 2006 | 4 | |
| Asian Contemporary Arts Festival | Asian Contemporary Arts Festival | 2006 | 1 | |
| Askepott-Teateret | Askepott-Teateret | 2006 | 7 | |
| Askø Artist | Askø Artist | 2010 | 1 | |
| Asociación Obrera de Teatro | Asociación Obrera de Teatro | 1927 | 2 | |
| Assitej World Congres | Assitej World Congres | 1999 | 1 | |
| Assitej-festivalen | Assitej-festivalen | 1992 – 1993 | 3 | |
| Associate Players | Associate Players | 1922 | 2 | |
| Association Franco-Norvégienne | Association Franco-Norvégienne | 1929 | 1 | |
| Associazione Coro e Orchestra Desiderio da Settignano | Associazione Coro e Orchestra Desiderio da Settignano | 2009 | 1 | |
| Associazione Culturale 'Gianni Santuccio' | Associazione Culturale 'Gianni Santuccio' | 2000 – 2020 | 5 | |
| Associazione culturale Extravagarte | Associazione culturale Extravagarte | 2005 – 2022 | 6 | 2 |
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