| Lizotte, Geneviève | Geneviève Lizotte | Designer | 2022 | 1 | |
| Leach, Tim | Tim Leach | Designer | 2022 | 1 | |
| Lang, Albert | Albert Lang (Albert Lang) | Designer, Director | 2003 - 2006 | 4 | |
| Lovejoy, Robin | Robin Lovejoy (Robin Lovejoy) | Designer, Director | 1967 - 1982 | 2 | |
| Luna, Phil | Phil Luna | Designer, Director | 2009 | 2 | |
| Lenz, Philipp | Philipp Lenz | Designer, Director | 1995 | 4 | |
| Lindqvist, Olof | Olof Lindqvist | Designer, Director | 2005 | 2 | |
| Lindfors, Jorma | Jorma Lindfors | Designer, Director | 1968 | 2 | |
| Lemaitre, Laurene | Laurene Lemaitre | Designer, Director | 2014 - 2020 | 6 | |
| Ladurner, Rudolf | Rudolf Ladurner | Designer, Director | 2019 | 2 | |
| Lago, Xúlio | Xúlio Lago (Xúlio Lago) | Designer, Director, Dramaturg, Lighting Designer | 1995 - 1998 | 12 | |
| León, Juan | Juan León | Designer, Dramaturg, Set Designer | 1958 - 2008 | 15 | |
| Lopez, Ramon | Ramon Lopez (Ramon Lopez) | Designer, Lighting Designer | 1973 - 1981 | 7 | |
| Lee, Eugene | Eugene Lee | Designer, Lighting Designer | 1968 - 2013 | 9 | |
| Leone, Leon Di | Leon Di Leone | Designer, Lighting Designer | 1984 | 2 | |
| Leff, Thomas | Thomas Leff | Designer, Lighting Designer | 1982 | 2 | |
| Lucas, John R. | John R. Lucas | Designer, Lighting Designer | 1971 - 1998 | 3 | |
| Luna, Alejandro | Alejandro Luna | Designer, Lighting Designer | 2017 - 2020 | 10 | |
| Lange, Laurent | Laurent Lange | Designer, Lighting Designer | 2017 | 2 | |
| Lund, Mark | Mark Lund | Designer, Sound Designer | 2005 | 2 | |
| Lockwood, Jennifer | Jennifer Lockwood (Jennifer Lockwood) | Director | 2001 | 1 | |
| Lackner, Peter | Peter Lackner (Peter Lackner) | Director | 2001 | 1 | |
| Laffan, Patrick | Patrick Laffan (Patrick Laffan) | Director | 1975 - 1984 | 3 | |
| Lahti, Katariina | Katariina Lahti (Katariina Lahti) | Director | 1978 - 2002 | 2 | |
| Langham, Michael | Michael Langham (Michael Langham) | Director | 1957 - 1996 | 2 | |
| Larthe, Paul | Paul Larthe (Paul Larthe) | Director | 1941 | 1 | |
| Law, Caroline | Caroline Law (Caroline Law) | Director | 2004 | 1 | |
| Lazier, Gil | Gil Lazier (Gil Lazier) | Director | 2003 - 2010 | 3 | |
| Leder, Peter | Peter Leder (Peter Leder) | Director | 1969 | 1 | |
| Legband, Dr. Paul | Paul Legband (Dr. Paul Legband) | Director | 1912 - 1938 | 3 | |
| Lehrman, Mike | Mike Lehrman (Mike Lehrman) | Director | 1975 | 1 | |
| Lhota, Karel | Karel Lhota (Karel Lhota) | Director | 1957 | 1 | |
| Lidon, Christophe | Christophe Lidon (Christophe Lidon) | Director | 2003 | 2 | |
| Liebens, Marc | Marc Liebens (Marc Liebens) | Director | 1975 - 1977 | 10 | |
| Liljeberg, Jorg | Jorg Liljeberg (Jorg Liljeberg) | Director | 1986 | 1 | |
| Linden, Gustaf | Gustaf Linden (Gustaf Linden) | Director | 1914 - 1925 | 5 | |
| Linke, Sybille | Sybille Linke (Sybille Linke) | Director | 1998 | 1 | |
| Lloyd, Matthew | Matthew Lloyd (Matthew Lloyd) | Director | 2005 - 2006 | 3 | |
| Löffler, Peter | Peter Löffler (Peter Löffler) | Director | 1961 - 1972 | 2 | |
| Lowrey, Sara | Sara Lowrey (Sara Lowrey) | Director | 1928 | 2 | |
| Lynn, Jack | Jack Lynn (Jack Lynn) | Director | 1950 - 1953 | 2 | |
| Lyon, Marianne | Marianne Lyon (Marianne Lyon) | Director | 2005 | 1 | |
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