- Läckberg, Camilla
- Lagrange, Pierre
- Lamballe, Marie
- Lambdin, Dewey
- Landy, Derek
- Lane, Andrew
- Lange, Kathrin
- Lange, Roland
- Langer, Siegfried
- Lansdale, Joe R.
- Lapidus, Jens
- Lark, Sarah
- Larson, Sara B.
- Larsson, Åsa
- Larsson, Stieg
- Lasky, Kathryn
- Laureen, Anne
- Laurin, Ruben
- Lawhead, Stephen
- Lawrence, Mark
- Laymon, Richard
- Le Guin, Ursula, K.
- Lee, Geneva
- Leibig, Timo
- Lehmann, Christine
- Lehmann, Ralf
- Lehtolainen, Leena
- Leix, Bernd
- Lenth, Lars
- Leon, Donna
- Lewis, C. S.
- Ley, Rosanna
- Lima, Mario
- Lind, Hera
- Lindell, Unni
- Lindqvist, John Ajvide
- Lindstein, Mariette
- Link, Charlotte
- Lisle, Holly
- Liu, Cixin
- Locke, Attica
- Lode, Christoph
| - Lorentz, Iny
- Lorenz, Janina
- Lorne, Mac P.
- Losbohm, Nadja
- Low, Robert
- Löffler, Rainer
- Löhnig, Inge
- Lucas, Emilia
- Lucas, George
- Ludlum, Robert
- Ludwig, Stephan
- Lukianenko, Sergej
- Lumley, Brian
- Lunde, Maja
- Lupano, Wilfrid
- Lustbader, Eric van
- Lynch, Scott
- Lynn, J.
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