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- Mercedes Lackey, (born 1950) author of the Velgarth/Valdemar novels
- R.A. Lafferty, (1914–2002)
- Sterling E. Lanier, (1927–2007)
- Josh Lanyon
- Rick Law, (born 1969)
- Stephen R. Lawhead, (born 1950)
- Tanith Lee, (born 1947) author of the Tales from the Flat Earth series
- Lee Yeongdo, (born 1972) author of the Dragon Raja
- Ursula K. Le Guin, (born 1929) author of the Earthsea novels
- Fritz Leiber, (1910–1992) author of the Fafhrd and the Gray Mouser stories
- Valery Leith, (born 1968) pseudonym of Tricia Sullivan
- Madeleine L'Engle, (1918–2007) author of A Wrinkle in Time
- C.S. Lewis, (1898–1963) author of The Chronicles of Narnia series, The Space Trilogy, and The Screwtape Letters
- Astrid Lindgren, (1907–2002), author of Pippi Longstocking
- Megan Lindholm, (born 1952) pseudonym of Margaret Astrid Lindholm Ogden who also writes as Robin Hobb
- David Lindsay, (1876–1945)
- Jane Lindskold, author of the Firekeeper saga
- Holly Lisle, (born 1960) author of The Secret Texts and Korre series
- Ian Livingstone, (co)author of many Fighting Fantasy books
- Massimo Lo Jacono
- H. P. Lovecraft, (1890–1937) author of the Cthulhu mythos stories
- Helen Lowe, author of the Heir of Night series
- Lois Lowry, (born 1937) author of The Giver and Gathering Blue
- Elizabeth A. Lynn
- Scott Lynch, (born 1978) author of The Gentleman Bastard sequence
Read more about this topic: List Of Fantasy Authors