| Betty Hennings Turne | Betty Hennings Tourneen (Betty Hennings Turne) | 1901 | 13 | |
| Binghamton University Department of Theatre | Binghamton University Department of Theatre | 2004 | 1 | |
| Bird Theatre Company | Bird Theatre Company | 2006 – 2008 | 8 | 2 |
| Birmingham Repertory Theatre Company | Birmingham Repertory Theatre Company | 1915 – 2013 | 54 | 3 |
| BITEF 2003 | BITEF 2003 | 2003 | 1 | |
| Black Box Teater | Black Box Teater | 2009 – 2010 | 2 | 1 |
| Black Debbath | Black Debbath () | 2006 | 1 | 1 |
| Black Hills State University | Black Hills State University | 1999 | 1 | |
| Black Inc. | Black Inc. | 1986 | 1 | |
| Black Ram Theatre Company | Black Ram Theatre Company | 2010 | 15 | |
| Black Swamp Players | Black Swamp Players | 2023 | 1 | |
| Blanche Bates and Company | Blanche Bates and Company | 1901 | 1 | |
| Bloomington Area Arts Council, The | The Bloomington Area Arts Council | 2002 | 1 | |
| Blue Bridge’ | Blue Bridge’ | 2022 | 1 | |
| Bluebird Photoplay | Bluebird Photoplays (Bluebird Photoplay) | 1917 | 1 | |
| Bohurupee | Bohurupee | 1952 – 1958 | 2 | |
| Bombín Teatro | Bombín Teatro | 2025 | 2 | |
| Bonfils Theatre | Bonfils Theatre | 1974 | 1 | |
| Borba Teatro | Borba Teatro | 2024 | 1 | |
| Borgny Hammer and Company | Borgny Hammer and Company | 1920 – 1935 | 12 | |
| Borkmanturnen | Borkmanturnen | 1897 | 9 | |
| Boston Bijou Theatre Company | Boston Bijou Theatre Company | 1907 | 1 | |
| Boulder's Upstart Crow Theatre Company | Boulder's Upstart Crow Theatre Company | 2003 – 2008 | 2 | |
| Box Theatre Company | Box Theatre Company | 2002 | 1 | |
| Bregenzer Festspiele | Bregenzer Festspiele | 1950 – 1978 | 2 | |
| BrianzAcque s.r.l | BrianzAcque s.r.l | 2021 | 6 | |
| Bridgewater College Theatre | Bridgewater College Theatre | 2025 | 1 | |
| Bright China Drama Society | Bright China Drama Society | 1935 | 1 | |
| Brisbane Arts Theatre | Brisbane Arts Theatre | 1990 – 1993 | 3 | |
| Brisbane Festival | Brisbane Festival | 1959 – 2006 | 2 | |
| Brisbane Repertory Theatre | Brisbane Repertory Theatre | 1928 | 1 | |
| Budapesti Thália, A | A Budapesti Thália | | | |
| Buffton Universtiy | Buffton Universtiy | 2023 | 1 | |
| BUL - Spellaget | BUL - Spellaget | 2009 | 2 | |
| Bungei Kyokai (The Literary Society) | Bungei Kyokai (The Literary Society) | 1911 – 1912 | 7 | |
| Bunka-chō | Bunka-chō (Agency for Cultural Affairs) | 2023 | 2 | |
| Burgtheater | Burgtheater | 1884 – 2019 | 9 | |
| Burning Coal Theatre Company | Burning Coal Theatre Company | 2001 | 1 | |
| Burnside Players | Burnside Players | 2009 | 1 | |
| Bühnen der Stadt Essen | Bühnen der Stadt Essen | 1924 – 1937 | 9 | |
| Byks 08 | Byks 08 | 2008 | 1 | |
| Bærum Studiescene | Bærum Studiescene | 1944 | 2 | |
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