- Llewellyn, Edward; pseudonym of Edward Llewellyn-Thomas (1917-1984) (items) (chron.)
- See www.sf-encyclopedia.com/entry/llewellyn_edward
- Llewellyn, Livia (fl. 2000s-2020s) (items) (chron.)
- See liviallewellyn.com
- Llewellyn, [Sir] (Samuel Henry) William (1858-1941) (items) (chron.)
- See en.wikipedia.org/wiki/William_Llewellyn
- Lloyd, John Uri (1849-1936) (items) (chron.)
- See www.sf-encyclopedia.com/entry/lloyd_john_uri
- Lloyd, Rebecca (fl. 1990s-2010s) (items) (chron.)
- See anakimwriter.blogspot.co.uk
- Lloyd, Rebecca (fl. 1990s-2020s) (items) (chron.)
- See www.beccalloyd.org
- Loader, Claire (fl. 2010s-2020s) (items) (chron.)
- See www.allthefallingstones.com
- Lobo, Douglas P. (fl. 2010s-2020s) (items) (chron.)
- See www.artstation.com/water_in_black
- LoBrutto, Patrick (1948- ) (items)
- See en.wikipedia.org/wiki/Pat_LoBrutto
- Locicero, Thomas (fl. 2010s) (items) (chron.)
- See www.goodreads.com/author/show/6469595.Thomas_Locicero
- Locke, Dave (1944-2012) (items) (chron.)
- See fancyclopedia.org/Dave_Locke
- Locke, George (Walter) (1936-2019) (items) (chron.)
- See www.sf-encyclopedia.com/entry/locke_george
- Locke, Richard Adams (1800-1871) (items) (chron.)
- See www.sf-encyclopedia.com/entry/locke_richard_adams
- Lockemann, Georg (1871-1959) (items)
- See en.wikipedia.org/wiki/Georg_Lockemann
- Lockhart, E.; pseudonym of Emily Jenkins (1967- ) (items)
- See en.wikipedia.org/wiki/E._Lockhart
- Lockwood, (Walter) Scammon (c1878-1955) (items) (chron.)
- Born in Brooklyn, circulation manager of Current Opinion, advertising manager, died in Manhattan.
- Lodge, [Sir] Oliver (Joseph) (1851-1940) (items) (chron.)
- See en.wikipedia.org/wiki/Oliver_Lodge
- Lodi, Edward (fl. 1980s-2020s) (items) (chron.)
- See www.pw.org/content/edward_lodi_1
- Loehle, Richard E(dward) (1923-2011) (items) (chron.)
- See loehleart.com/
- Loenen-Ruiz, Rochita (fl. 2000s-2020s) (items) (chron.)
- See rcloenenruiz.com
- Loewen, (Craig) Alan (1954- ) (items) (chron.)
- See literary-equine.livejournal.com
- Lofficier, Jean-Marc (1954- ) (items) (chron.)
- See www.sf-encyclopedia.com/entry/lofficier_jean-marc
- Lofficier, Randy (1953- ) (items) (chron.)
- See en.wikipedia.org/wiki/Jean-Marc_Lofficier
- Lofgren, Eric (fl. 2020s) (items) (chron.)
- See www.artstation.com/ericlofgren
- Loftus, Peter (C.) (fl. 2000s-2010s) (items) (chron.)
- See irishcomics.wikia.com/wiki/Peter_C._Loftus
- Logan, Sean (fl. 1990s-2010s) (items) (chron.)
- See www.cometpress.us/authors/#slogan
- Logsdon, Syd (1950?- ) (items) (chron.)
- See www.sf-encyclopedia.com/entry/logsdon_syd
- Lohrman, Paul (fl. 1950s); house pseudonym used by Richard S. Shaver (1907-1975) (items) (chron.)
- See www.sf-encyclopedia.com/entry/lohrman_paul
- Lombardi, Nicola (fl. 2010s-2020s) (items) (chron.)
- See www.nicolalombardi.com
- London, Jack; [born John Griffith Chaney] (1876-1916) (items) (chron.)
- See en.wikipedia.org/wiki/Jack_London
- London, Jordan Hamessley (fl. 2010s) (items) (chron.)
- See www.publishingcrawl.com/team-member/jordan-hamessley-london/
- London, Matt (fl. 2010s) (items) (chron.)
- See themattlondon.com
- Long, Amelia Reynolds (1904-1978) (items) (chron.)
- See tellersofweirdtales.blogspot.co.uk/2015/03/amelia-reynolds-long-1904-1978.html
- Long, Beth Adele (fl. 2000s) (items) (chron.)
- See www.bethadele.com
- Long, Charles R(ussell) (1904-1978) (items)
- See www.sf-encyclopedia.com/entry/long_charles_r
- Long, Cynthia June (fl. 2010s) (items) (chron.)
- See cynthiajunelong.wordpress.com
- Long, Duncan (Eugene) (1949- ) (items) (chron.)
- See www.sf-encyclopedia.com/entry/long_duncan
- Long, Frank Belknap (Jr.) (1903-1994) (items) (chron.)
- See www.sf-encyclopedia.com/entry/long_frank_belknap
- Long, Gabrielle M(argaret) V(ere) (1885-1952); previously known as Margaret Campbell (items) (chron.)
- Born in Hayling; birth registered as Margaret Gabrielle Vere Campbell. Daughter of Mrs. Vere Campbell.
- Long, James (fl. 2000s-2010s) (items) (chron.)
- See www.sf-encyclopedia.com/entry/long_james
- Long, Jeff(rey B.) (1951- ) (items) (chron.)
- See www.sf-encyclopedia.com/entry/long_jeff
- Long, Julius (W.) (1907-1955) (items) (chron.)
- Magazine writer. Born in Ohio; studied law; admitted to the Ohio bar and practiced law in that state.
- Long, Nathan (Alling) (fl. 1990s-2020s) (items) (chron.)
- See blogs.stockton.edu/longn
- Long, Steven M. (fl. 2010s) (items) (chron.)
- See stevenmlong.com
- Longenecker, George (fl. 2020s) (items) (chron.)
- See www.greenmountainclub.org/about/board-of-directors/george-longenecker
- Long-Ewing, Kimberley (fl. 2000s-2010s) (items) (chron.)
- See kim.mysticsheepstudios.com
- Longfellow, Henry Wadsworth (1807-1882) (items) (chron.)
- See en.wikipedia.org/wiki/Henry_Wadsworth_Longfellow
- Longhorn, David (fl. 1990s-2020s) (items) (chron.)
- See suptales.blogspot.co.uk
- Longstreet, Stephen; [born Chauncey Weiner] (1907-2002) (items) (chron.)
- See www.stephenlongstreet.com/
- Longstreth, T(homas) Morris (1886-1975) (items)
- See www.sf-encyclopedia.com/entry/longstreth_t_morris
- Longworth, Toby (fl. 1980s-2010s) (items)
- See en.wikipedia.org/wiki/Toby_Longworth
- Longyear, Barry B(rookes) (1942- ) (items) (chron.)
- See www.sf-encyclopedia.com/entry/longyear_barry_b
- Loomis, (Charles) Battell (, III) (1889-1961) (items) (chron.)
- Son of Charles Battell Loomis.
- Loomis, Noel (Miller) (1905-1969) (items) (chron.)
- See www.sf-encyclopedia.com/entry/loomis_noel
- Looney, Jack (fl. 1960s-1980s) (items)
- Has also done books on games. Probably pseudonymous.
- Loory, Ben (1971- ) (items) (chron.)
- See en.wikipedia.org/wiki/Ben_Loory
- Lopatin, Jackie Britton (fl. 2010s) (items) (chron.)
- See grantvillegazette.com/author/lopatin_j
- Lopez, A., Jr. (fl. 2010s) (items) (chron.)
- See alopezjr.com
- Lopez, Arnaldo, Jr. (fl. 1990s-2010s) (items) (chron.)
- See arnaldolopezjr.com
- Lopez, Aurelio Rico, III (fl. 2000s-2010s) (items) (chron.)
- See www.goodreads.com/author/show/1323116.Aurelio_Rico_Lopez_III
- Lopez, Lore (fl. 2020s) (items) (chron.)
- See lorefiend.com
- Lopez, Lori R. (fl. 2010s-2020s) (items) (chron.)
- See fairyflyentertainment.com
- López, (Campo) Ricardo Burgos (1966- ) (items) (chron.)
- See www.serpienteemplumada.com/campo_burgos.htm
- Lord, Karen (1968- ) (items) (chron.)
- See www.sf-encyclopedia.com/entry/lord_karen
- Lord, Mark (fl. 2010s-2020s) (items) (chron.)
- See marklord.info
- Lords, Traci; [born Nora Louise Kuzma] (1968- ) (items)
- See en.wikipedia.org/wiki/Traci_Lords
- Lorien, Serena (1982- ) (items)
- See www.imdb.com/name/nm2161732