| Lindsley, Charles F. | Charles F. Lindsley (Charles F. Lindsley) | Director | 1951 | 1 | |
| Lasoń, Władysław | Władysław Lasoń (Władysław Lasoń) | Director | 1955 | 1 | |
| Larsen, Johannes Anker | Johannes Anker Larsen (Johannes Anker Larsen) | Director | 1936 - 1943 | 3 | |
| Lacina, František | František Lacina (František Lacina) | Director | 1902 - 1936 | 2 | |
| Leicester, Emilie | Emilie Leicester (Emilie Leicester) | Director | 1891 | 1 | |
| Lehmann, Hans Dieter | Hans Dieter Lehmann (Hans Dieter Lehmann) | Director | 1973 | 1 | |
| Levick, Jemima | Jemima Levick (Jemima Levick) | Director | 2010 | 1 | |
| Loy, Frances | Frances Loy (Frances Loy) | Director | 2011 | 1 | |
| Laading, Herman | Herman Laading (Herman Laading) | Director | 1853 - 1861 | 4 | 1 |
| Lebrun, Theodor | Theodor Lebrun (Theodor Lebrun) | Director | 1888 | 1 | |
| Léon, Viktor | Viktor Léon (Viktor Léon) | Director | 1898 | 1 | |
| Lehmann, Julius | Julius Lehmann (Julius Lehmann) | Director | 1899 - 1900 | 2 | |
| Lewinger, Ernst | Ernst Lewinger (Ernst Lewinger) | Director | 1897 - 1920 | 24 | |
| Linsemann, Paul | Paul Linsemann (Paul Linsemann) | Director | 1903 - 1913 | 16 | |
| Lert, Dr. Ernst | Ernst Lert (Dr. Ernst Lert) | Director | 1920 | 2 | |
| Litten, Dr. Heinz Wolfgang | Heinz Wolfgang Litten (Dr. Heinz Wolfgang Litten) | Director | 1930 - 1932 | 2 | |
| Lietzau, Hans | Hans Lietzau (Hans Lietzau) | Director | 1949 - 1989 | 2 | |
| Lier, František | František Lier (František Lier) | Director | 1906 | 1 | |
| Lindberg, Per | Per Lindberg (Per Lindberg) | Director | 1918 - 1943 | 9 | |
| Lepre, Gianni | Gianni Lepre | Director | 1978 | 2 | |
| Lengyel, György | György Lengyel | Director | 1965 - 1994 | 6 | |
| Lynn, Heery | Heery Lynn | Director | 1978 | 1 | |
| Larson, Philip | Philip Larson | Director | 1973 - 1983 | 2 | |
| Lau, Patrick | Patrick Lau | Director | 1979 | 2 | |
| Loy, John | John Loy | Director | 1975 | 1 | |
| Linins, Arnolds | Arnolds Linins | Director | 1975 | 1 | |
| Langer, Günter | Günter Langer | Director | 1979 | 2 | |
| Lukas-Kindermann, Heinz | Heinz Lukas-Kindermann | Director | 1981 | 1 | |
| Lewis, Leo, R. | Leo R. Lewis | Director | 1913 | 1 | |
| Lahdensuo, Jalmari | Jalmari Lahdensuo | Director | 1916 | 1 | |
| Lichtenstein, Wolfgang | Wolfgang Lichtenstein | Director | 1981 | 1 | |
| Lhotzky, Georg | Georg Lhotzky | Director | 1961 | 1 | |
| Lüdi, Peter | Peter Lüdi | Director | 1972 | 1 | |
| Landefort, Lisbeth | Lisbeth Landefort | Director | 1983 | 1 | |
| Lichard, Ivan | Ivan Lichard | Director | 1955 | 1 | |
| Littler, Tom | Tom Littler | Director | 2005 | 2 | |
| Leveaux, David | David Leveaux | Director | 1992 - 2008 | 4 | |
| Langhoff, Thomas | Thomas Langhoff | Director | 1980 - 2008 | 16 | |
| Langfield, Angela | Angela Langfield | Director | 1977 - 1984 | 2 | |
| Lucia, Emma | Emma Lucia | Director | 2012 - 2014 | 4 | |
| Liimatta, Jeremy | Jeremy Liimatta | Director | 2012 | 1 | |
| Laporte, Eva | Eva Laporte | Director | 2013 | 1 | |
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