- Lyon, Richard (Elmer) (1913-2002) (art)
- See pulpartists.com/Lyon.html
- Lyons, David (fl. 1970s-2010s) (stories)
- See www.davidlyonsauthor.com
- Lyons, Lynda (1949- ) (stories)
- See www.sf-encyclopedia.com/entry/lyons_lynda
- Maberry, Jonathan (1958- ) (stories) (assoc.)
- See en.wikipedia.org/wiki/Jonathan_Maberry
- MacArthur, Jodi (fl. 2000s-2010s) (stories)
- See www.jodimacarthur.blogspot.co.uk
- MacBird, Bonnie (1951- ) (stories)
- See en.wikipedia.org/wiki/Bonnie_MacBird
- MacBride, Stuart (1969- ) (stories) (assoc.)
- See en.wikipedia.org/wiki/Stuart_MacBride
- MacCreagh, Gordon (1886-1953) (stories)
- See pulpflakes.blogspot.com/2012/08/gordon-maccreagh-adventurer-explorer.html
- MacDonald, A(lexander) B(lack) (1871-1942) (stories)
- See www.revolvy.com/page/A.-B.-MacDonald
- MacDonald, John D(ann) (1916-1986) (stories) (assoc.)
- See en.wikipedia.org/wiki/John_D._MacDonald
- MacDonald, Philip (1900-1980) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/macdonald_philip
- Macdonald, W. A. (fl. 1910s-1930s) (stories)
- Newspaperman; editor of the Boston Evening Transcript.
- MacDonald, (Allan) William Colt (1891-1968) (stories)
- Born in Michigan; lived most of his life in the West; prolific author of westerns.
- Macfadden, Bernarr (1868-1955) (stories)
- See www.sf-encyclopedia.com/entry/macfadden_bernarr
- Macgowan, Kenneth (1888-1963) (stories)
- See en.wikipedia.org/wiki/Kenneth_Macgowan
- MacHarg, William B(riggs) (1872-1951) (stories)
- See www.sf-encyclopedia.com/entry/macharg_william
- Machen, Arthur; pseudonym of Arthur Llewellyn Jones (1863-1947) (stories) (assoc.)
- See en.wikipedia.org/wiki/Arthur_Machen
- MacIntyre, F(eargus) Gwynplaine (1949?-2010) (stories)
- See www.sf-encyclopedia.com/entry/macintyre_f_gwynplaine
- MacIsaac, Fred(erick John) (1886-1940) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/macisaac_fred
- Mack, Thomas (Daniel) (1891-?) (stories)
- Born in Rochester, New York; author and salesman; death not traced.
- Mackall, Dandi Daley (fl. 2010s) (stories)
- See en.wikipedia.org/wiki/Dandi_Daley_Mackall
- Mackay, Lewis Hugh (1897-1963) (stories)
- Born in Bengal, India. Husband of Barbara James.
- MacKaye, Harold Steele (1866-1928) (stories)
- See www.sf-encyclopedia.com/entry/mackaye_harold_steele
- MacKenzie, W(illiam) A(ndrew) (1870-1942) (stories)
- Born in Invergordon, Scotland.
- MacLean, Alistair (Stuart) (1922-1987) (stories) (assoc.)
- See en.wikipedia.org/wiki/Alistair_MacLean
- MacLean, Robinson (1910-1960) (stories)
- Born in Idaho; magazine writer, author of biography of Haile Selassie, war correspondent, aircraft specifications engineer. Died in Tujunga, California (?).
- MacLeod, Adam Gordon (1883-1945) (stories)
- Born in Inverness, Scotland; died in Dorchester, Dorset, England.
- MacMurdy, Natalie [née Hillman] (1901-1979) (stories)
- See www.newspapers.com/clip/31875490/the_times_leader/
- MacNeal, Susan Elia (fl. 2010s) (stories) (assoc.)
- See www.susaneliamacneal.com
- MacNichol, Kenneth (Hartley) (1887-1955) (stories)
- See tellersofweirdtales.blogspot.co.uk/2013/11/om-cabral-1887-1955.html
- MacPherson, Catriona (fl. 2010s) (stories)
- See catrionamcpherson.com
- MacRae, Andrew (fl. 2010s) (stories) (assoc.)
- See www.murdermisdirected.com
- Madden, (Jerry) David (1933- ) (stories)
- See en.wikipedia.org/wiki/David_Madden_(novelist)
- Maddock, Larry; pseudonym of Jack Jardine (1931-2009) (stories)
- See www.sf-encyclopedia.com/entry/maddock_larry
- Madeleine, Julia (fl. 2010s) (stories)
- See www.goodreads.com/author/show/1421418.Julia_Madeleine
- Maffini, Mary Jane (1947- ) (stories)
- Librarian turned mystery bookstore owner in Ottawa.
- Mağden, Perihan (1960- ) (stories)
- See en.wikipedia.org/wiki/Perihan_Ma%C4%9Fden
- Maginn, William (1793-1842) (stories)
- See www.sf-encyclopedia.com/entry/maginn_william
- Maguire, Robert (A.) (1921-2005) (art)
- See en.wikipedia.org/wiki/Robert_Maguire
- Mahaffay, Robert E(rvine) (1890-1967) (stories)
- Interested in railroads.
- Mahannah, Floyd (1911-1976) (stories)
- Also wrote mysteries.
- Mahjoub, Jamal (1966- ) (stories)
- See en.wikipedia.org/wiki/Jamal_Mahjoub
- Mailer, Norman (Kingsley) (1923-2007) (stories)
- Major novelist, short story writer, poet, essayist, playwright, media figure. Born in Long Branch, New Jersey. Husband of Norris Church Mailer.
- Mailer, Norris Church (1949-2010) (stories)
- Wife of Norman Mailer.
- Mainwaring, Daniel (Geoffrey) (1902-1977) (stories)
- Born near Dunlap, California; graduate of Fresno State College in 1926; reporter for the Fresno Bee, crime reporter for the Los Angeles Herald, Los Angeles Daily News, and Los Angeles Express.
- Maitland, Barry (1941- ) (stories) (assoc.)
- Born in Scotland; educated at Cambridge; retired Professor of Architecture in Australia.
- Major, (John) Dagney (1875-1937) (stories)
- See www.sf-encyclopedia.com/entry/hayward_dagney
- Major, J. Michael (fl. 1980s-2010s) (stories)
- See jmichaelmajor.com
- Major, Tim (fl. 2010s) (stories)
- See cosycatastrophes.wordpress.com
- Makgill, [Sir] George (1868-1926) (stories)
- Father of J. D. Makgill.
- Makgill, J(ohn) D(onald Alexander Arthur) (1899-1986) (stories)
- Son of Sir George Makgill.
- Makin, William J(ames) (1894-1944) (stories)
- See www.sf-encyclopedia.com/entry/makin_william_j
- Makovesky, Tess (fl. 2010s) (stories)
- See tessmakovesky.wordpress.com
- Malafarina, Thomas M. (fl. 2010s) (stories) (assoc.)
- See thomasmmalafarina.com
- Maldonado, Isabella (fl. 2010s) (stories) (assoc.)
- See isabellamaldonado.com
- Malliet, G. M. (fl. 2000s-2010s) (stories)
- See gmmalliet.com
- Malone, Thomas J. (fl. 1920s-1930s) (stories)
- Not the dealer in wholesale fish (1859-1920).
- Maltby, H(enry) F(rancis) (1880-1963) (stories)
- Born in Cape of Good Hope, South Africa; bank clerk, then actor, first appearing on stage in 1899 in the U.K.; prolific playwright.
- Malzberg, Barry N(athaniel) (1939- ) (stories)
- See www.sf-encyclopedia.com/entry/malzberg_barry_n
- Mamatas, Nick [i.e., Nicholas Mamatas] (1972- ) (stories) (art)
- See www.sf-encyclopedia.com/entry/mamatas_nick
- Manfredo, Lou (fl. 2000s-2010s) (stories)
- See www.loumanfredo.com
- Mangeot, Robert (fl. 2010s) (stories)
- See robertmangeot.com
- Mankell, Henning (1948-2015) (stories) (assoc.)
- See en.wikipedia.org/wiki/Henning_Mankell
- Mann, E(dward) B(everly) (1902- ) (stories)
- Author of westerns, editor. Born in Hollis, Kansas.
- Manners, David X. (1912-2007) (stories)
- According to his son Tim he wasnt actually David X. Manners but was David X Manners as the X was his whole name and not an initial.
- Manners, William [born William Rosenberg] (1907-1994) (stories)
- Born in Butler, Pennsylvania.
- Mannetti, Lisa (fl. 2000s-2010s) (stories) (assoc.)
- See www.lisamannetti.com/about.htm
- Manso, Leo [born Leo Jacob Mansowitz] (1914-1993) (art)
- See www.nytimes.com/1993/02/09/arts/leo-manso-dies-collagist-painter-and-teacher-78.html
- Mantchev, Lisa (fl. 2000s-2010s) (stories)
- See en.wikipedia.org/wiki/Lisa_Mantchev
- Manteufel, M. B.; pseudonym (fl. 2010s) (stories)
- See www.smashwords.com/profile/view/mbmanteufel
- Marbais, Amanda (fl. 2010s) (stories)
- See www.joylandmagazine.com/authors/amanda-marbais
- Marchetti, Lou(is J.) (1920-1992) (art)
- See loumarchetti.com
- Marcin, Max [born Max Schlamjack] (1879-1948) (stories)
- See en.wikipedia.org/wiki/Max_Marcin
- Marcus, Carl (Edward) (1921-1998) (stories)
- Born in Cody, Wyoming; served in army military intelligence in WWII; private investigator; died in Hemet, California.
- Marcus, Ken(neth J.) (1952-2010) (stories)
- See www.legacy.com/obituaries/latimes/obituary.aspx?n=Kenneth-Marcus&pid=149046463
- Mariner, Scott; pseudonym of C. M. Kornbluth (1923-1958) & Frederik Pohl (1919-2013) (stories)
- See www.sf-encyclopedia.com/entry/mariner_scott
- Mariotte, Jeff(rey J.) (1955- ) (stories)
- See en.wikipedia.org/wiki/Jeff_Mariotte
- Marko, Zekial [born Marvin Leroy Schmoker] (1933-2008) (stories)
- Born in Monterey, California; died in Centralia, Washington. Brother of Kenn Davis.
- Markowitz, Jeff (1950s- ) (stories) (assoc.)
- See www.jeffmarkowitz.com
- Marks, Jeffrey (1960- ) (stories)
- See en.wikipedia.org/wiki/Jeffrey_Marks
- Marks, Paul D. (fl. 1990s-2010s) (stories)
- See www.pauldmarks.com
- Marlett, Melba (Balmat Grimes) (1909-1994) (stories)
- Born in Ohio; graduate of Univ. of Michigan; taught English in Detroit for some years.
- Marlowe, Dan(iel) J(ames, Jr.) (1914-1986) (stories) (assoc.)
- Mystery writer. Born in Lowell, Massachusetts; resident in Michigan; died in Los Angeles. Note: William C. Odell, 1915- , was reportedly the uncredited co-author of a dozen or more novels after The Raven Is a Blood Red Bird (1967), on which he was credited.
- Marlowe, Francis (Joseph) (1870-1944) (stories)
- Died in Kensington, London.
- Marlowe, Stephen [born Milton Lesser] (1928-2008) (stories)
- See en.wikipedia.org/wiki/Stephen_Marlowe
- Marmor, Arnold (1927-1988) (stories)
- Born and died in New York City.
- Marmur, Jacland (1901-1970) (stories)
- Author and explorer. Born in Sosnowiec, Poland; came to the United States in 1918; died in San Rafael, California (?).
- Maron, Margaret (Elizabeth Brown) (1938- ) (stories) (assoc.)
- See en.wikipedia.org/wiki/Margaret_Maron
- Marquez, R. (fl. 2010s) (stories)
- See www.r-marquez.com
- Marquis, George Bruce (1879-?) (stories)
- Writer. Born in Kansas; lived in Walla Walla, Washington.
- Marquis, Samuel (fl. 2010s) (stories)
- See samuelmarquisbooks.com
- Marriott, Crittenden (1867-1932) (stories)
- See www.sf-encyclopedia.com/entry/marriott_crittenden
- Marsh, Howard R(oland) (1893-1974) (stories)
- Explorer, adventurer. Not to be confused with the musical actor of the same name (d. 1969).
- Marsh, Paul (1931- ) (stories)
- Architect turned writer in England.
- Marsh, Richard; pseudonym of Richard B. Heldmann (1857-1915) (stories)
- See en.wikipedia.org/wiki/Richard_Marsh_(author)
- Marsh, Willard (N.) (1922-1970) (stories)
- See www.lib.uiowa.edu/scua/msc/tomsc800/msc794/msc794.html
- Marshall, (Claude Cunningham) Bruce (1899-1987) (art)
- See www.sf-encyclopedia.com/entry/marshall_bruce