| Athens Festival | Athens Festival | 2006 – 2010 | 2 | |
| Associazione Culturale 'Gianni Santuccio' | Associazione Culturale 'Gianni Santuccio' | 2000 – 2020 | 5 | |
| August Rasmussens Teaterselskab | August Rasmussens Teaterselskab | 1876 – 1878 | 16 | |
| Albert u. Else Bassermann | Albert u. Else Bassermann | 1933 – 1950 | 13 | |
| Arendalsuka | Arendalsuka | 2013 | 1 | |
| Ateneul Tătăraşi | Ateneul Tătăraşi | 2011 | 1 | |
| Alfredo B. Crevenna | Alfredo B. Crevenna | 1954 | 2 | |
| Ambasciata Norvegese in Italia | Ambasciata Norvegese in Italia | 2020 | 1 | |
| Agnes Sorma und die Irving Place Theatergesellschaft, N.Y. | Agnes Sorma und die Irving Place Theatergesellschaft, N.Y. | 1898 | 1 | |
| Askø Artist | Askø Artist | 2010 | 1 | |
| AGADU | AGADU | 1999 | 1 | |
| Attic Collective, The | The Attic Collective | 2023 | 1 | |
| Australian Elizabethan Theatre Trust, The | The Australian Elizabethan Theatre Trust | 1970 | 3 | |
| August Sandberg Sällskap | August Sandberg Sällskap | 1878 – 1880 | 5 | |
| ARW Prosjektteater | ARW Prosjektteater | 2006 | 4 | |
| Assitej World Congres | Assitej World Congres | 1999 | 1 | |
| Agrupació Avenir | Agrupació Avenir | 1905 | 1 | |
| Adelaide Repertory Theatre Incorporated | Adelaide Repertory Theatre Incorporated | 1917 – 1964 | 3 | |
| Aesthetic Realism Theatre Company, The | The Aesthetic Realism Theatre Company | 2001 | 2 | |
| Antrepriza D. I. Basmanova | Antrepriza D. I. Basmanova (D. I. Basmanov's Enterprise) | 1907 | 1 | |
| American Conservatory Theater | American Conservatory Theater | 1973 – 2007 | 8 | |
| Association Franco-Norvégienne | Association Franco-Norvégienne | 1929 | 1 | |
| Afternoon Theatre, The | The Afternoon Theatre | 1909 | 2 | |
| Adelaide Festival of Arts | Adelaide Festival of Arts | 2006 | 1 | |
| Artéria Színházi Társaság | Artéria Színházi Társaság | 2003 – 2004 | 4 | |
| Azad Teater | Azad Teater | 1992 | 1 | |
| Alexander Moissi | Alexander Moissi | 1933 | 2 | |
| Aarohan Theatre Group | Aarohan Theatre Group | 2003 – 2007 | 11 | |
| Albert Ranfts dramatiska turné | Albert Ranfts dramatiska turné | 1919 | 1 | |
| American Ibsen Theater | American Ibsen Theater | 1983 – 1985 | 6 | |
| Antiklimax | Antiklimax | 2022 | 1 | |
| Akosha | Akosha | 1976 | 3 | |
| Agnes Sorma Ensemble | Agnes Sorma Ensemble | 1900 | 11 | |
| Arendal Ballett Center | Arendal Ballett Center | 2010 | 1 | |
| Arts Theatre of Cambridge, The | The Arts Theatre of Cambridge | 1936 | 4 | |
| Akademičeskij dramatičeskij teatr im. V. F. Komissarževskoj | Akademičeskij dramatičeskij teatr im. V. F. Komissarževskoj (Komissarzhevskaya Theatre) | 2016 | 1 | |
| Adelaide University Theatre Guild | Adelaide University Theatre Guild | 1960 – 1986 | 5 | |
| Akademisch-Dramatischer Verein | Akademisch-Dramatischer Verein (Akademische-Dramatische Verein) | 1893 | 4 | |
| Akademi for scenekunst | Akademi for scenekunst | 2006 – 2009 | 5 | |
| Argot produzioni | Argot produzioni | 2012 | 1 | 1 |
| Associazione Culturale Nati Domani | Associazione Culturale Nati Domani | 2021 | 1 | 1 |
| Associazione la Maddalena | Associazione la Maddalena | 1975 | 1 | 1 |
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