| Landmark Theatre, The | The Landmark Theatre | England, Ilfracombe, Promenade | 2011-05-03 | 2014-11-08 | 2011–2014 | 2 | |
| Lancaster Grand Theatre | Lancaster Grand Theatre | England, Lancaster, Saint Leonard's Gate, Town Centre | 2014-10-30 | 2014-10-30 | 2014 | 1 | |
| Loft Theatre - Main House, The | The Loft Theatre - Main House | England, Leamington Spa, Victoria Terrace, Town Centre | 2007-10-17 | 2018-04-07 | 2007–2018 | 2 | |
| Leicester Haymarket Theatre | Leicester Haymarket Theatre | England, Leicester, Belgrave Gate | 1975-10-22 | 2000-10-07 | 1975–2000 | 3 | |
| Lichfield Garrick Theatre | Lichfield Garrick Theatre | England, Lichfield, Castle Dyke | 1901-05-13 | 2010-02-13 | 1901–2010 | 3 | |
| Liskeard School & Community College | Liskeard School & Community College | England, Liskeard, Luxstowe, | 2013-10-22 | 2013-10-23 | 2013 | 1 | |
| Liverpool | Liverpool | England, Liverpool | -- | -- | | | |
| LIPA - Sennheiser Studio Theatre | LIPA - Sennheiser Studio Theatre | England, Liverpool, Pilgrim st / Mount st | 2009-05-14 | 2009-05-14 | 2009 | 1 | |
| Liverpool Playhouse | Liverpool Playhouse | England, Liverpool, Williamson Square | 1928-03-24 | 2006-04-15 | 1928–2006 | 4 | |
| London | London | England, London | 1923-12-03 | -- | 1923–1985 | 3 | |
| Little Theatre, The | The Little Theatre | England, London | 1911-03-28 | -- | 1911–1935 | 2 | |
| London Central Y.M.C.A. | London Central Y.M.C.A. | England, London, 112 Great Russell St | 1927-11-15 | -- | 1927 | 1 | |
| Leighton House Museum | Leighton House Museum | England, London, 12 Holland Park Road, Holland Park, | 2014-04-01 | 2014-04-02 | 2014 | 1 | |
| London Theatre, The | The London Theatre | England, London, 443 New Cross Rd | 2014-01-21 | 2014-01-26 | 2014 | 1 | |
| Landor Theatre | Landor Theatre | England, London, 70 Landor Rd, | 2000-04-19 | 2000-05-06 | 2000 | 1 | |
| London School of Economics Dramatic Society | London School of Economics Dramatic Society | England, London, Houghton St | 1928-03-23 | -- | 1928 | 1 | |
| Linbury Theatre | Linbury Theatre | England, London, Royal Opera House, Bow St | 2005-09-22 | 2006-06-10 | 2005–2006 | 2 | |
| Lyric Theatre | Lyric Theatre | England, London, Shaftesbury Avenue | 1925-02-02 | -- | 1925 | 1 | |
| Lyttelton Theatre | Lyttelton Theatre | England, London, Upper Ground | 1976-03-17 | 2017-03-21 | 1976–2016 | 5 | |
| Lost Theatre | Lost Theatre | England, London, Vauxhall, 208 Wandsworth Road | 2010-07-27 | 2010-11-11 | 2010 | 2 | |
| Loughborough Town Hall Theatre | Loughborough Town Hall Theatre | England, Loughborough, Leicestershire, Market Place | 2014-10-21 | 2014-10-21 | 2014 | 1 | |
| Luton Library Theatre | Luton Library Theatre | England, Luton, Bridge St | 1985-01-30 | 1993-10-02 | 1985–1993 | 2 | |
| Library Theatre | Library Theatre | England, Manchester, Central Library, St Peter's Square | 1996-03-19 | 1996-03-23 | 1996 | 1 | |
| Lace Market Theatre, The | The Lace Market Theatre | England, Nottingham, Halifax Pl, | 2012-05-07 | 2012-05-23 | 2012 | 1 | |
| Lighthouse Theatre | Lighthouse Theatre | England, Poole, Dorset, 21 Kingland Rd | 2006-05-23 | 2006-05-27 | 2006 | 1 | |
| Lowry Centre | Lowry Centre | England, Salford Quays, Pier 8 | 2000-10-24 | 2019-10-19 | 2000–2019 | 6 | |
| Lyceum Theatre | Lyceum Theatre | England, Sheffield, 55 Norfolk Street | 1903-06-15 | 1910-06-02 | 1903–1913 | 9 | |
| Lower Glasshouse Theatre | Lower Glasshouse Theatre | England, Stourbridge, Wollaston Rd | 2005-06-17 | 2005-07-24 | 2005 | 1 | |
| Lahden Kaupunginteatteri | Lahden Kaupunginteatteri | Finland, Lahti, Kirkkokatu 14 | 1954-09-30 | 2012-03-24 | 1954–2011 | 6 | |
| Lappeenranta | Lappeenranta | Finland, Lappeenranta | 1973-08-01 | -- | 1973 | 1 | |
| Lappeenrannan Kaupunginteatteri | Lappeenrannan Kaupunginteatteri | Finland, Lappeenranta, 56, Valtakatu | 1926-- | 2006-05-10 | 1926–2006 | 4 | |
| Lieksa | Lieksa | Finland, Lieksa | -- | -- | | | |
| Lohjan Teatteri | Lohjan Teatteri | Finland, Lohja, Suurlohjankatu 12 | 1953-- | 1954-- | 1953 | 1 | |
| Lac de la Triouzoune | Neuvic - Lac de la Triouzoune | France | 2023-07-21 | 2023-07-21 | 2023 | 2 | |
| Lafage-sur-Sombre - Place de l'Oratoire | Lafage-sur-Sombre - Place de l'Oratoire | France | 2023-08-05 | 2023-07-21 | 2023 | 2 | |
| Le Théâtre | Le Théâtre | France, Auxerre, 54 Rue Joubert | 1999-03-27 | -- | 1999 | 1 | |
| L'Ange, Théâtre De | Théâtre De L'Ange | France, Avignon, 15 Rue des Teinturiers | 2018-07-15 | 2018-07-28 | 2018 | 1 | |
| La Maison du Conte | La Maison du Conte | France, Chevilly-Larue, 8 Rue Albert Thuret | 1999-03-26 | 1999-03-28 | 1999 | 1 | |
| La Coupole (Sénart) | La Coupole (Sénart) | France, Combs-la-Ville, 107 Rue Jean François Millet | 1999-03-12 | 2013-04-03 | 1999–2013 | 2 | |
| La Faïencerie | Théâtre La Faïencerie | France, Creil, Allée Nelson, 60100 | 2024-11-07 | 2024-11-08 | 2024 | 1 | |
| Le Prisme | Le Prisme | France, Elancourt, Quartier Des Sept Mares | 1999-04-07 | 1999-04-09 | 1999 | 1 | |
| Le Salmanazar | Le Salmanazar | France, Épernay, 8 Rue de Reims | 2014-02-11 | -- | 2014 | 1 | |
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