| Assitej World Congres | Assitej World Congres | 1999 | 1 | |
| Asociación Obrera de Teatro | Asociación Obrera de Teatro | 1927 | 2 | |
| Adelaide Repertory Theatre Incorporated | Adelaide Repertory Theatre Incorporated | 1917 – 1964 | 3 | |
| Aesthetic Realism Theatre Company, The | The Aesthetic Realism Theatre Company | 2001 | 2 | |
| Adelaide Festival of Arts | Adelaide Festival of Arts | 2006 | 1 | |
| Agrupament literari ‘Henrik Ibsen’ | Agrupament literari ‘Henrik Ibsen’ | 1904 | 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 | |
| Albert Ranfts dramatiska turné | Albert Ranfts dramatiska turné | 1919 | 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 | |
| Arendal Ballett Center | Arendal Ballett Center | 2010 | 1 | |
| American Ibsen Theater | American Ibsen Theater | 1983 – 1985 | 5 | |
| Akosha | Akosha | 1976 | 3 | |
| Agnes Sorma Ensemble | Agnes Sorma Ensemble | 1900 | 11 | |
| Arts Theatre of Cambridge, The | The Arts Theatre of Cambridge | 1936 | 4 | |
| 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 | |
| Amatørteatret | Amatørteatret | | | |
| Australia Council for the Arts | Australia Council for the Arts | 1970 – 1998 | 5 | |
| Associazione culturale T.E - A.I.A.S.P | Associazione culturale T.E - A.I.A.S.P | 2008 | 4 | |
| Asian Contemporary Arts Festival | Asian Contemporary Arts Festival | 2006 | 1 | |
| Albert Ranfts Sällskap | Albert Ranfts Sällskap | 1885 – 1900 | 21 | |
| Agrupació Avenir | Agrupació Avenir | 1905 | 1 | |
| Arósio, Garcia & Rangel Produtores e Associados | Arósio, Garcia & Rangel Produtores e Associados | 2001 | 2 | |
| August-Kurz-Ensemble, Das | Das August-Kurz-Ensemble | 1896 | 2 | |
| Almeida Theatre Company, The | The Almeida Theatre Company | 1990 – 2018 | 5 | |
| Abilene Christian University Department of Theatre | Abilene Christian University Department of Theatre | 2002 | 1 | |
| Atenea | Atenea | 1919 | 1 | |
| American Academy of Dramatic Arts | American Academy of Dramatic Arts | 1907 | 2 | |
| ARTE TV | ARTE TV | 2003 – 2006 | 8 | |
| Agnes Straub | Agnes Straub | 1935 | 1 | |
| Arendals Dramatiske Selskab | Arendals Dramatiske Selskab | 2011 | 1 | |
| Actors Company, The | The Actors Company | 1996 – 2003 | 3 | |
| Acting Company Mito Theatre | Acting Company Mito Theatre | 1993 | 1 | |
| Akademischer Verein für Kunst und Litteratur | Akademischer Verein für Kunst und Literatur (Akademischer Verein für Kunst und Litteratur) | 1902 | 1 | |
| Artestudio | Artestudio | 2006 | 1 | |
| Allan Holubar | Allan Holubar | 1915 | 1 | |
|
|
