| Litten, Dr. Heinz Wolfgang | Heinz Wolfgang Litten (Dr. Heinz Wolfgang Litten) | Director | 1930 - 1932 | 2 | |
| Lietzau, Hans | Hans Lietzau | Director | 1949 - 1989 | 2 | 1 |
| Lier, František | František Lier | Director | 1906 | 1 | |
| Lindberg, Per | Per Lindberg | Director | 1918 - 1943 | 9 | |
| Lepre, Gianni | Gianni Lepre | Director | 1978 | 2 | 1 |
| Lengyel, György | György Lengyel | Director | 1965 - 1994 | 6 | 1 |
| Lynn, Heery | Heery Lynn | Director | 1978 | 1 | 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 | 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 | 1 |
| Langhoff, Thomas | Thomas Langhoff | Director | 1980 - 2008 | 16 | 1 |
| 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 | |
| Löbach, Dieter | Dieter Löbach | Director | 1986 | 1 | |
| Lassalle, Jacques | Jacques Lassalle | Director | 1987 | 1 | 1 |
| Lürssen, Günter | Günter Lürssen | Director | 1984 | 1 | |
| Lennerts, Kirilee | Kirilee Lennerts | Director | 2012 | 1 | |
| Lee, Stephen | Stephen Lee | Director | 2012 | 1 | |
| Lane, Harry | Harry Lane | Director | 1990 | 1 | |
| Laukšteins, Herberts | Herberts Laukšteins | Director | 1993 | 1 | 1 |
| Lewis, Irene | Irene Lewis | Director | 1994 | 1 | 1 |
| Lyall-Watson, Katherine | Katherine Lyall-Watson | Director | 1994 | 1 | |
| Laskowska, Wanda | Wanda Laskowska | Director | 1980 | 1 | |
| Laurin, František | František Laurin | Director | 1979 - 2000 | 3 | |
| Lundén, Bobo | Bobo Lundén | Director | 1997 | 1 | 1 |
| Lamude, Terence | Terence Lamude | Director | 1997 | 1 | |
| Lipus, Radovan | Radovan Lipus | Director | 1995 | 1 | |
| Latchinian, Sewan | Sewan Latchinian | Director | 1995 - 2015 | 7 | 1 |
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