| Lancaster University Theatre Group | Lancaster University Theatre Group | 2005 | 1 | |
| Landestheater Meiningen | Landestheater Meiningen | 1923 | 1 | |
| Leipziger Stadttheater | Leipziger Stadttheater | 1893 – 1914 | 34 | |
| Leikfelag Reykjavikur | Leikfelag Reykjavikur | 1903 – 2002 | 15 | |
| Landesbühne Rhein-Main | Landesbühne Rhein-Main | 1963 | 2 | |
| Landmark Productions | Landmark Productions | 2023 | 1 | |
| Lynet | Lynet | 2010 | 2 | |
| Liepājas Latviešu teātris | Liepājas Latviešu teātris | 1913 | 1 | |
| Lena Ashwell Players, The | The Lena Ashwell Players | 1923 | 3 | |
| Lindland natur og natur | Lindland natur og natur | 2009 | 1 | |
| Landesbühne Hannover | Landesbühne Hannover | 1963 – 1965 | 4 | |
| LIFT | LIFT | 1995 | 1 | |
| Lydia Yavorskas (princess Bariatinsky) Matinees | Lydia Yavorskas (princess Bariatinsky) Matinees | 1909 – 1911 | 2 | |
| London Haymarket Theatre Company | London Haymarket Theatre Company | 1895 | 3 | |
| Lorentz Lundgrens sällskap | Lorentz Lundgrens sällskap | 1885 – 1887 | 4 | |
| LaFil Orchestra | LaFil Orchestra | 2023 | 1 | |
| LeArt | LeArt | 2006 – 2007 | 3 | |
| Latviešu Pagaidu Nacionālais teātris | Latviešu Pagaidu Nacionālais teātris | 1918 | 6 | |
| Little Theatre of New Haven, The | The Little Theatre of New Haven | 1931 | 1 | |
| Lindesnes fyr | Lindesnes fyr | 2011 | 1 | |
| Lynchburg College Theatre | Lynchburg College Theatre | 2005 | 1 | |
| Lillehammer Amatørteater | Lillehammer Amatørteater | 2006 | 1 | |
| Loft Theatre Company, The | The Loft Theatre Company | 2007 – 2018 | 2 | |
| Lessing-Gesellschaft | Lessing-Gesellschaft | 1903 | 1 | |
| Lotten Dorschs sällskap | Lotten Dorschs sällskap | 1892 | 2 | |
| Luzége Festival Company | Luzége Festival Company | 2023 | 9 | |
| L.A. Theatre Works | L.A. Theatre Works | 1997 – 2011 | 3 | |
| Landestheater Linz (Kleine Bühne) | Landestheater Linz (Kleine Bühne) | 1919 – 1920 | 4 | |
| Livros Cotovia | Livros Cotovia | 2020 | 2 | |
| Lantern Theater Company, The | The Lantern Theater Company | 1999 – 2005 | 2 | |
| Lwowski Teatr Ludowy | Lwowski Teatr Ludowy | 1912 | 1 | |
| Louisiana Players' Guild | Louisiana Players' Guild | 1937 | 1 | |
| Lillehammer Ballettskole | Lillehammer Ballettskole | 2006 | 1 | |
| Library Theatre Company | Library Theatre Company | 2011 | 4 | 4 |
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