| Library Theatre Company | Library Theatre Company | 2011 | 4 | 4 |
| La Gilda delle Arti | La Gilda delle Arti | 2021 | 16 | 2 |
| Laboratorio Minimo Teatro | Laboratorio Minimo Teatro | 2010 | 2 | 2 |
| L' Accademia Gaetano Marziali di Seveso | L' Accademia Gaetano Marziali di Seveso | 2024 | 4 | 2 |
| Le Cercle Rouge | Le Cercle Rouge | 2013 | 8 | 2 |
| La compagnia il Rubino | La compagnia il Rubino | 2018 | 4 | 2 |
| La Famiglia Mastorna | La Famiglia Mastorna | 2014 | 3 | 1 |
| LaSpring | LaSpring | 2013 – 2014 | 3 | 1 |
| La Compagnia Teatrale “VI luglio” | La Compagnia Teatrale “VI luglio” | 2016 | 2 | 1 |
| Lyric Hammersmith Theatre, The | The Lyric Hammersmith Theatre | 1994 – 2025 | 5 | 1 |
| La compagnia di Giuseppe Schirillo | La compagnia di Giuseppe Schirillo | 2024 | 1 | 1 |
| La compagnia teatrale Il Barattolo | La compagnia teatrale Il Barattolo | 2017 | 1 | 1 |
| Le Nuvole-Teatro Stabile di Innovazione per Ragazzi | Le Nuvole-Teatro Stabile di Innovazione per Ragazzi | 2012 | 1 | 1 |
| La Compagnia Dell'Eclissi | La Compagnia Dell'Eclissi | 2013 | 1 | 1 |
| L’Altro Teatro | L’Altro Teatro | 2017 | 1 | 1 |
| Landesbühne Hannover | Landesbühne Hannover | 1963 – 1965 | 4 | |
| LIFT | LIFT | 1995 | 1 | |
| Lincoln Center Theater | Lincoln Center Theater | 2025 | 1 | |
| Lydia Yavorskas (princess Bariatinsky) Matinees | Lydia Yavorskas (princess Bariatinsky) Matinees | 1909 – 1911 | 2 | |
| London Haymarket Theatre Company | London Haymarket Theatre Company | 1895 | 3 | |
| Luzége Festival Company | Luzége Festival Company | 2023 | 9 | |
| Lorentz Lundgrens sällskap | Lorentz Lundgrens sällskap | 1885 – 1887 | 4 | |
| Livros Cotovia | Livros Cotovia | 2020 | 2 | |
| 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 | |
| Laboratorio N.C.T. Verona | Laboratorio N.C.T. Verona | 2016 – 2022 | 20 | |
| Lynchburg College Theatre | Lynchburg College Theatre | 2005 | 1 | |
| Lillehammer Amatørteater | Lillehammer Amatørteater | 2006 | 1 | |
| Live Theatre Workshop | Live Theatre Workshop | 2025 | 1 | |
| Loft Theatre Company, The | The Loft Theatre Company | 2007 – 2018 | 2 | |
| Lessing-Gesellschaft | Lessing-Gesellschaft | 1903 | 1 | |
| La Comédie de Reims, centre dramatique national | La Comédie de Reims, centre dramatique national | 2008 | 1 | |
| La Caja de Fósforos | La Caja de Fósforos | 2023 | 1 | |
| Lotten Dorschs sällskap | Lotten Dorschs sällskap | 1892 | 2 | |
| Landmark Productions | Landmark Productions | 2023 | 1 | |
| L.A. Theatre Works | L.A. Theatre Works | 1997 – 2011 | 3 | |
| Landestheater Linz (Kleine Bühne) | Landestheater Linz (Kleine Bühne) | 1919 – 1920 | 4 | |
| 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 | |
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