- London, Matt (fl. 2010s) (stories)
- See themattlondon.com
- Long Lance, Chief Buffalo Child [born Sylvester Clark Long] (1890-1932) (stories)
- See en.wikipedia.org/wiki/Chief_Buffalo_Child_Long_Lance
- Long, Amelia Reynolds (1904-1978) (stories) (assoc.)
- See tellersofweirdtales.blogspot.co.uk/2015/03/amelia-reynolds-long-1904-1978.html
- Long, Beth Adele (fl. 2000s) (stories)
- See www.bethadele.com
- Long, Christopher E. (fl. 2010s) (stories)
- See christopherelong.com
- Long, Cynthia June (fl. 2010s) (stories)
- See cynthiajunelong.wordpress.com
- Long, Duncan (Eugene) (1949- ) (stories) (art) (assoc.)
- See www.sf-encyclopedia.com/entry/long_duncan
- Long, Elgen (Marion) (1927- ) (stories) (assoc.)
- See en.wikipedia.org/wiki/Elgen_Long
- Long, Frank Belknap (Jr.) (1903-1994) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/long_frank_belknap
- Long, Gabrielle M(argaret) V(ere, née Campbell) (1885-1952) (stories)
- Born in Hayling; birth registered as Margaret Gabrielle Vere Campbell. Daughter of Mrs. Vere Campbell.
- Long, H(erbert) Kingsley (1890-1964) (stories)
- Born in India.
- Long, Haniel (Clark) (1888-1956) (stories)
- See oac.cdlib.org/findaid/ark:/13030/kt2779n7p1/entire_text/
- Long, Huey (Pierce, Jr.) (1893-1935) (stories) (assoc.)
- See en.wikipedia.org/wiki/Huey_Long
- Long, James (fl. 2000s-2010s) (stories)
- See www.sf-encyclopedia.com/entry/long_james
- Long, James Parker (1890?-1970) (stories)
- Insurance executive. Born in Rangoon, Burma; died in Naples, New York.
- Long, Jeff(rey B.) (1951- ) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/long_jeff
- Long, Julius (W.) (1907-1955) (stories)
- Magazine writer. Born in Ohio; studied law; admitted to the Ohio bar and practiced law in that state.
- Long, Lily Augusta (1860-1927) (stories)
- Born in St. Paul, Minnesota.
- Long, Manning (1906- ) (stories)
- Born in Chase City, Virginia, on 3/4/1906; married Peter Wentworth Williams on 5/23/1944. No further details found. Note: Her husband Peter Wentworth Williams was a noted ceramist who designed the Mystery Writers of Americas Edgar Award.
- Long, Nat(haniel John) (1893-1955) (art)
- See bearalley.blogspot.com/2018/09/nat-long.html
- Long, Nathan (Alling) (fl. 1990s-2010s) (stories) (assoc.)
- See blogs.stockton.edu/longn
- Long, (William) Ray (1878-1935) (stories)
- See en.wikipedia.org/wiki/Ray_Long
- Long, Richard (fl. 2010s) (stories) (assoc.)
- See www.thebookofpaul.com/about-me
- Long, Robert (Edward) Crozier (1872-1938) (stories)
- See en.wikipedia.org/wiki/Robert_Edward_Crozier_Long
- Long, Steven M. (fl. 2010s) (stories)
- See stevenmlong.com
- Long-Ewing, Kimberley (fl. 2000s-2010s) (stories)
- See kim.mysticsheepstudios.com
- Longden, Ray (fl. 1960s) (stories)
- Probably pseudonymous.
- Longenbach, James (1959- ) (stories)
- See en.wikipedia.org/wiki/James_Longenbach
- Longenbaugh, John (fl. 2010s) (stories)
- See johnlongenbaugh.com
- Longfellow, Henry Wadsworth (1807-1882) (stories) (assoc.)
- See en.wikipedia.org/wiki/Henry_Wadsworth_Longfellow
- Longfellow, (Margaret) Isabelle Bryans (1905-1997) (stories)
- See www.obitcentral.com/obitsearch/obits/tn/tn-knox33.htm
- Longfellow, Samuel (1819-1892) (stories)
- See en.wikipedia.org/wiki/Samuel_Longfellow
- Longhorn, David (fl. 1990s-2010s) (stories) (assoc.)
- See suptales.blogspot.co.uk
- Longhurst, Henry (Carpenter) (1909-1978) (stories)
- See en.wikipedia.org/wiki/Henry_Longhurst
- Longhurst, Percy (William) (1874-1959) (stories)
- Born in Hackney, London, England; died in Battersea, London.
- Longman, Thomas Norton (1771-1842) (stories) (assoc.)
- See www.rc.umd.edu/node/104626
- Longrigg, Roger (Erskine) (1929-2000) (stories) (assoc.)
- See en.wikipedia.org/wiki/Roger_Longrigg
- Longstreet, James (1821-1904) (stories)
- See en.wikipedia.org/wiki/James_Longstreet
- Longstreet, Stephen [born Chauncey Weiner] (1907-2002) (stories) (art)
- See www.stephenlongstreet.com/
- Longstreth, T(homas) Morris (1886-1975) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/longstreth_t_morris
- Longtine, Gene (fl. 1950s-1960s) (stories)
- Apparently a real person and an expert on sports.
- Longworth, Alice (Lee) Roosevelt (1884-1980) (stories) (assoc.)
- See en.wikipedia.org/wiki/Alice_Roosevelt_Longworth
- Longworth, Toby (fl. 1980s-2010s) (stories) (assoc.)
- See en.wikipedia.org/wiki/Toby_Longworth
- Longyear, Barry B(rookes) (1942- ) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/longyear_barry_b
- Loomis, Noel (Miller) (1905-1969) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/loomis_noel
- Looney, Jack (fl. 1960s-1980s) (stories) (assoc.)
- Has also done books on games. Probably pseudonymous.
- Loos, Anita (1889-1981) (stories)
- See en.wikipedia.org/wiki/Anita_Loos
- Lopes, [Sir] Henry Charles, 1st Baron Ludlow (1828-1899) (stories) (assoc.)
- See en.wikipedia.org/wiki/Henry_Lopes,_1st_Baron_Ludlow
- Lopez, Antony (1950- )
- See bearalley.blogspot.co.uk/2012/05/antony-lopez.html
- Lopez, Aurelio Rico, III (fl. 2000s-2010s) (stories) (art)
- See www.goodreads.com/author/show/1323116.Aurelio_Rico_Lopez_III
- Lopez, J. Estanislao (fl. 2010s) (stories)
- See www.pw.org/content/j_estanislao_lopez
- Lopez, Lori R. (fl. 2010s) (stories)
- See fairyflyentertainment.com
- López, (Campo) Ricardo Burgos (1966- ) (stories)
- See www.serpienteemplumada.com/campo_burgos.htm
- Lopresti, Robert (fl. 1970s-2010s) (stories) (assoc.)
- See home.nas.com/lopresti
- Loraine, Robert (Bilcliffe) (1876-1935) (stories) (assoc.)
- See en.wikipedia.org/wiki/Robert_Loraine
- Lord, Daniel A(loysius) (1888-1955) (stories)
- Born in Chicago.
- Lord, Frederic I(ves) (1897-1967) (stories) (assoc.)
- See en.wikipedia.org/wiki/Frederic_Ives_Lord
- Lord, Gabrielle (Craig) (1946- ) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/lord_gabrielle
- Lord, Graham (John) (1943-2015) (stories)
- See www.sf-encyclopedia.com/entry/lord_graham
- Lord, Jeffrey; house pseudonym (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/lord_jeffrey
- Lord, Karen (1968- ) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/lord_karen
- Lord, Mark (fl. 2010s) (stories)
- See marklord.info
- Lorimer, George Horace (1868-1937) (stories)
- See www.sf-encyclopedia.com/entry/lorimer_george_horace
- Lorimer, Graeme (1903-1983) (stories)
- Born in Wyncote, Pennsylvania.
- Lorimer, Janet (G.) (1945- ) (stories)
- All titles about 60 pp. and intended for adults learning to read.
- Lorimer, Norma (Octavia) (1864-1948) (stories)
- Born in Perthshire; her father was a Manxman, and she grew up and was educated on the Isle of Man; traveled widely in later life, and lived in Italy.
- Lorimer, Sarah (Moss) (1906-2000) (stories)
- Born in a suburb of Philadelphia.
- Lörinczy, Judit (fl. 2010s) (stories) (assoc.)
- See judlorin.blogspot.com
- Loring, Emilie (née Baker) (1866-1951) (stories)
- Born in Boston.
- Loring, Jennifer (fl. 1990s-2010s) (stories)
- See jenniferloring.wordpress.com
- Lorrah, Jean (1940- ) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/lorrah_jean
- Lorrain, Claude [born Claude Gellée] ({c}1600-1683) (art)
- See en.wikipedia.org/wiki/Claude_Lorrain
- Lorraine, Lilith; pseudonym of Mary M. Wright (1894-1967) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/lorraine_lilith
- Lory, Robert (Edward) (1936- ) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/lory_robert
- Loschütz, Gert (1946- ) (stories) (assoc.)
- See de.wikipedia.org/wiki/Gert_Losch%C3%BCtz
- Loscocco, Amethyst (fl. 2010s) (stories)
- See www.amethystloscocco.com
- Lossing, Benson J(ohn), LL.D. (1813-1891) (stories)
- See en.wikipedia.org/wiki/Benson_John_Lossing
- Lostetter, Marina J. (fl. 2010s) (stories)
- See www.lostetter.net
- Lostutter, Melvin (Simmons) (1895-1958) (stories)
- Columbus, Indiana newspaperman; wrote pulp stories of WWI while belatedly attending U of New Mexico; ended career as professor of journalism at Michigan State; died on vacation in Canada.
- Lotaryov, Igor Vasilyevich (1887-1941) (stories)
- See en.wikipedia.org/wiki/Igor_Severyanin
- Lott, (R.) Bret(ley) (1958- ) (stories)
- See en.wikipedia.org/wiki/Bret_Lott
- Lott, D. Lee (fl. 2010s) (stories)
- See www.smashwords.com/profile/view/dleelott
- Lott, S. Makepeace [i.e., Stanley Makepeace-Lott] (1920-1991) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/lott_s_makepeace
- Lotz, Sarah (fl. 2000s-2010s) (stories) (assoc.)
- See sarahlotz.com
- Loubet, Émile (François) (1838-1929) (stories) (assoc.)
- See en.wikipedia.org/wiki/%C3%89mile_Loubet
- Loud, Lingard (1891-1981) (stories)
- See norman.hrc.utexas.edu/bookshopdoor/signature.cfm?item=116#1
- Louderback, Walt (1887-1941) (art)
- See artcontrarian.blogspot.co.uk/2013/12/walt-louderback-painterly-illustrator.html
- Loudon, Agnes ({c}1832-1864) (stories)
- See www.djo.org.uk/indexes/authors/agnes-loudon.html
- Louganis, Greg(ory Efthimios) (1960- ) (stories) (assoc.)
- See en.wikipedia.org/wiki/Greg_Louganis
- Lough, Glenn Dale (1906-1991) (stories)
- See www.mysteryfile.com/GLow/Author.html
- Loughborough, Dwight Logan (fl. 1910s) (stories)
- Probably the father of inventor Dwight L. Loughborough (1912-?).
- Loughead, Flora Haines (Apponyi) (1855-1943) (stories)
- Born in Milwaukee; educated at Lincoln University, Illinois; contributor to many magazines; special and editorial writer for San Francisco Chronicle, 1878-1909, then for San Francisco Examiner.
- Lougheed, R. E. (fl. 1940s) (art)
- Born in Massie, Ontario, Canada; lives in Santa Fe, New Mexico.
- Loughran, Rob(ert J.) (fl. 1990s-2010s) (stories)
- See foulmouthedbard.blogspot.co.uk
- Louinet, Patrice (1967- ) (stories) (art)
- See www.barbariankeep.com/louinet.html
- Louise of Denmark, Queen [i.e., Louise Wilhelmine Frederikke Caroline Auguste Julie] (1817-1898) (stories) (assoc.)
- See en.wikipedia.org/wiki/Louise_of_Hesse-Kassel
- Louise of Prussia, Queen [i.e., Luise Auguste Wilhelmine Amalie, Duchess of Mecklenburg-Strelitz] (1776-1810) (stories) (assoc.)
- See en.wikipedia.org/wiki/Louise_of_Mecklenburg-Strelitz