- Marie Louise of Austria, Archduchess [i.e., Maria Ludovica Leopoldina Franziska Therese Josepha Lucia] (1791-1847) (stories)
- See en.wikipedia.org/wiki/Marie_Louise,_Duchess_of_Parma
- Marie of Rumania, Queen [i.e., Marie Alexandra Victoria, previously Princess Marie of Edinburgh] (1875-1938) (stories) (assoc.)
- See en.wikipedia.org/wiki/Marie_of_Romania
- Mariella, [Dr.] Raymond Peel (, Sr.) (1919-2010) (stories)
- See file770.com/?p=4030
- Marietta, Becky (fl. 2010s) (stories)
- See thebeckymarietta.blogspot.co.uk
- Marillier, Juliet (1948- ) (stories) (assoc.)
- See en.wikipedia.org/wiki/Juliet_Marillier
- Marin, Augusto (1921-2011) (art)
- See articles.philly.com/2011-04-15/news/29421448_1_painter-lung-infection-murals
- Marín, Rafael [i.e., Rafael Marín Trechera] (1959- ) (stories)
- See en.wikipedia.org/wiki/Rafael_Mar%C3%ADn
- Mariner, Scott; pseudonym of C. M. Kornbluth (1923-1958) & Frederik Pohl (1919-2013) (stories)
- See www.sf-encyclopedia.com/entry/mariner_scott
- Marino, Andy (fl. 2000s-2010s) (stories)
- See andy-marino.com
- Mario, Alberto (1825-1883) (stories)
- See it.wikipedia.org/wiki/Alberto_Mario
- Marion, Elizabeth [i.e., Dora Elizabeth Marion Saunders] (1916-1989) (stories)
- Born in Washington state.
- Mariotte, Jeff(rey J.) (1955- ) (stories)
- See en.wikipedia.org/wiki/Jeff_Mariotte
- Maritano, Adela (Kalousek) (1918-2002) (stories)
- Born in Chicago; died in Santa Cruz, California.
- Marius, Soare ({c}1979- ) (art)
- See www.runner44.deviantart.com
- Mark, Jan(et Marjorie) (1943-2006) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/mark_jan
- Markey, Morris (1899-1950) (stories) (assoc.)
- Born in Alexandria, Virginia.
- Markham, [Admiral Sir] A(lbert) H(astings) (1841-1918) (stories) (assoc.)
- See en.wikipedia.org/wiki/Albert_Hastings_Markham
- Markham, [Sir] Clements (Robert) (1830-1916) (stories) (assoc.)
- See en.wikipedia.org/wiki/Clements_Markham
- Markham, (Charles) Edwin (Anson) (1852-1940) (stories)
- See en.wikipedia.org/wiki/Edwin_Markham
- Markham, Gervase ({c}1568-1637) (stories) (assoc.)
- See en.wikipedia.org/wiki/Gervase_Markham
- Markham, Violet R(osa) (1872-1959) (stories)
- See en.wikipedia.org/wiki/Violet_Markham
- Markino, Yoshio (1869-1956) (stories) (art)
- See www.askart.com/artist/Yoshio_Markino/11005433/Yoshio_Markino.aspx
- Marko, Zekial [born Marvin Leroy Schmoker] (1933-2008) (stories)
- Born in Monterey, California; died in Centralia, Washington. Brother of Kenn Davis.
- Markotin, Dimitri (fl. 2010s) (stories)
- See www.steamypunk.net/authors/dimitri_markotin/
- Markov, Georgi ({c}1980- ) (art)
- See hofarts.deviantart.com
- Markov, Haralambi (fl. 2010s) (stories)
- See haralambimarkov.com
- Markowitz, Jeff (1950s- ) (stories) (assoc.)
- See www.jeffmarkowitz.com
- Marks, C(hris) S. (fl. 2010s) (stories) (assoc.)
- See www.csmarks.com
- Marks, E(lmer) L. ({c}1894-?) (stories)
- Born in Illinois; worked in the yards as a shipbuilder in Los Angeles, California.
- Marks, Jeffrey (1960- ) (stories)
- See en.wikipedia.org/wiki/Jeffrey_Marks
- Marks, Paul D. (fl. 1990s-2010s) (stories)
- See www.pauldmarks.com
- Marks, Percy (1891-1956) (stories)
- Born in Covelo, California; educated at University of California and at Harvard; instructor in English at several universities.
- Markson, David (Merrill) (1927-2010) (stories)
- See www.sf-encyclopedia.com/entry/markson_david
- Markwick, Edward; pseudonym of Edward Markwick Johnson (1851-1921) (stories)
- See www.sf-encyclopedia.com/entry/markwick_edward
- Marlborough, Duke of [i.e., Charles Richard John Spencer-Churchill, 9th Duke of Marlborough] (1871-1934) (stories) (assoc.)
- See en.wikipedia.org/wiki/Charles_Spencer-Churchill,_9th_Duke_of_Marlborough
- Marlborough, The Duchess of [i.e., Consuelo Spencer-Churchill, Duchess of Marlborough, née Vanderbilt] (1877-1964) (stories)
- See en.wikipedia.org/wiki/Consuelo_Vanderbilt
- Marlett, Melba (Balmat Grimes) (1909-1994) (stories)
- Born in Ohio; graduate of Univ. of Michigan; taught English in Detroit for some years.
- Marley, Louise (née Campbell) (1952- ) (stories) (assoc.)
- See www.louisemarley.com
- Marlon, Brandon (fl. 2010s) (stories)
- See www.brandonmarlon.com
- Marlow, Gregory (fl. 2010s) (stories)
- See www.gregmarlow.com
- Marlow, Louis; pseudonym of Louis Wilkinson (1881-1966) (stories)
- See www.sf-encyclopedia.com/entry/marlow_louis
- Marlow, Max; joint pseudonym of Diana Mary Bachmann (1950- ) & Christopher Nicole (1930- ) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/marlow_max
- Marlowe, Christopher (1564-1593) (stories) (assoc.)
- See en.wikipedia.org/wiki/Christopher_Marlowe
- 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, Julia [born Sarah Frances Frost] (1865-1950) (stories) (assoc.)
- Born Sarah Frances Frost; her father changed the family name to Brough in 1870; she changed her name to Julia Marlowe in 1885.
- Marlowe, Spike (fl. 2010s) (stories)
- See spikemarlowe.wordpress.com
- Marlowe, Stephen [born Milton Lesser] (1928-2008) (stories)
- See en.wikipedia.org/wiki/Stephen_Marlowe
- Marmell, Ari (1974- ) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/marmell_ari
- Marmor, Arnold (1927-1988) (stories)
- Born and died in New York City.
- Marmur, Jacland (1901-1970) (stories) (assoc.)
- 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
- Maroon, Everett (fl. 2010s) (stories)
- See transplantportation.com
- Marot, Clément (1496-1544) (stories)
- See en.wikipedia.org/wiki/Cl%C3%A9ment_Marot
- Marquand, Henry G(urdon) (1819-1902) (stories) (assoc.)
- See en.wikipedia.org/wiki/Henry_Gurdon_Marquand
- Marquez, R. (fl. 2010s) (stories)
- See www.r-marquez.com
- Marquis, Frederick (James, 1st Earl of Woolton) (1883-1964) (stories) (assoc.)
- See en.wikipedia.org/wiki/Frederick_Marquis,_1st_Earl_of_Woolton
- Marquis, George Bruce (1879-?) (stories)
- Writer. Born in Kansas; lived in Walla Walla, Washington.
- Marquis, Samuel (fl. 2010s) (stories)
- See samuelmarquisbooks.com
- Marquitz, Tim (fl. 2010s) (stories) (assoc.)
- See www.tmarquitz.com
- Marr, John S(tuart), M.D. (1940- ) (stories) (assoc.)
- Has served as director and principal epidemiologist for the New York City Department of Health; living in Connecticut.
- Marr, Melissa (1972- ) (stories) (assoc.)
- See en.wikipedia.org/wiki/Melissa_Marr
- Marriott, Charles (1869-1957) (stories)
- Born in Bristol; qualified as a pharmacist; art critic and novelist; also a photographer; photographer and druggist at a mental hospital 1889-1901.
- Marriott, Crittenden (1867-1932) (stories)
- See www.sf-encyclopedia.com/entry/marriott_crittenden
- Marriott, James William (1884-1953) (stories)
- Born in Codnor; educated at Sevenoaks School; lecturer and freelance journalist; book reviewer and editor of collections plays.
- Marriott, (Norman) Ronald (1922-1972) (stories) (assoc.)
- See www.imdb.com/name/nm0550198/
- Marryat, Florence [i.e., Florence Marryat Church Lean] (1837-1899) (stories)
- Born in Brighton.
- Marryat, [Captain] Frederick (1792-1848) (stories) (assoc.)
- Born in Westminster; went to sea at 14; author of novels for adults and children.
- Mars, Alastair (Campbell Gillespie) (1915-1985) (stories) (assoc.)
- See en.wikipedia.org/wiki/Alastair_Mars
- Mars, Chris(topher Edward) (1961- ) (stories) (art) (assoc.)
- See en.wikipedia.org/wiki/Chris_Mars
- Marsden, Walter R. (fl. 1920s) (stories)
- Sportsman. Born in New York.
- Marsh, Anne [i.e., Anne Marsh-Caldwell] (1791-1874) (stories)
- Born in Staffordshire, daughter of the countys Deputy Lieutenant; married banker Arthur Marsh in 1817.
- Marsh, [Sir] Edward Howard (1872-1953) (stories)
- See en.wikipedia.org/wiki/Edward_Marsh_(polymath)
- Marsh, George Tracy (1876-1945) (stories)
- Born in Lansingburgh, N.Y.; educated at Yale and Harvard; a lawyer and author in Rhode Island; died in Providence.
- 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, Reginald (1898-1954) (art)
- See en.wikipedia.org/wiki/Reginald_Marsh_(artist)
- Marsh, Richard; pseudonym of Richard B. Heldmann (1857-1915) (stories) (assoc.)
- See en.wikipedia.org/wiki/Richard_Marsh_(author)
- Marsh, Richard (fl. 1970s-2010s) (stories)
- See richardmarshauthor.wordpress.com
- Marsh, Richard (1851-1933) (stories)
- See en.wikipedia.org/wiki/Richard_Marsh_(horseman)
- Marsh, Willard (N.) (1922-1970) (stories)
- See www.lib.uiowa.edu/scua/msc/tomsc800/msc794/msc794.html
- Marshack, Alexander (1918-2004) (stories) (assoc.)
- See en.wikipedia.org/wiki/Alexander_Marshack
- Marshak, Sondra (1940?- ) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/marshak_sondra
- Marshall, Alex; pseudonym of Jesse Bullington (fl. 2000s-2010s) (stories)
- See www.hachettebookgroup.com/authors/alex-marshall/
- Marshall, Alfred (1842-1924) (stories) (assoc.)
- See en.wikipedia.org/wiki/Alfred_Marshall
- Marshall, Archibald; pseudonym of Arthur Hammond Marshall (1866-1934) (stories)
- See www.sf-encyclopedia.com/entry/marshall_archibald
- Marshall, Arthur (1910-1989) (stories) (assoc.)
- See en.wikipedia.org/wiki/Arthur_Marshall_(broadcaster)
- Marshall, Arthur Hammond (1866-1934) (stories)
- Born in London; educated at Cambridge; editor and special correspondent.
- Marshall, (Emma) Beatrice (1861-1944) (stories)
- See www.victorianresearch.org/atcl/show_author.php?aid=2967
- Marshall, (Claude Cunningham) Bruce (1899-1987) (stories) (art) (assoc.)
- See www.sf-encyclopedia.com/entry/marshall_bruce
- Marshall, Denny E. (fl. 1990s-2010s) (stories) (art)
- See www.dennymarshall.com
- Marshall, Edison (Tesla) (1894-1967) (stories) (assoc.)
- See www.sf-encyclopedia.com/entry/marshall_edison
- Marshall, (Davis) Edward (1870-1933) (stories)
- Born in Enfield Center, N.Y.; held various editorial posts on New York newspapers from 1885; founded own syndicate in 1914.
- Marshall, Mrs. Frances Bridges [born Fanny Maria Bridges] (1837-1920) (stories)
- Born in Lambeth, London and educated in Essex and Cambridge; journalist, then novelist; variously lived in Torquay, Surrey, Herefordshire and Norfolk, where she died.