- Marryat, [Captain] Frederick (1792-1848) (stories)
- Born in Westminster; went to sea at 14; author of novels for adults and children.
- Marsh, Howard R(oland) (1893-1974) (stories)
- Explorer, adventurer. Not to be confused with the musical actor of the same name (d. 1969).
- Marshall, Edison (Tesla) (1894-1967) (stories)
- See www.sf-encyclopedia.com/entry/marshall_edison
- Martin, Al(bert Harry) (1895-1971) (stories)
- Born in Wisconsin; died in Los Angeles.
- Martin, Charles M(orris) Chuck (1891-1954) (stories) (assoc.)
- Some stories under this byline written by Charles S. Strong.
- Martin, Ian (1912-1981) (stories)
- Born in Glasgow, Scotland; actor and playwright, especially for radio; died in New York City.
- Martin, Jackson (1874-1946) (stories)
- See www.azcentral.com/community/mesa/articles/20130506powder-river-jack-buried-in-mesa-cemetery.html
- Martin, Neil (1885-1963) (stories)
- See pulpflakes.blogspot.co.uk/2015/07/pulp-reprints-collected-stories-of-sea.html
- Martin, Reginald Alec (1908-1971) (stories)
- See www.reginaldalecmartin.co.uk
- Martin, Robert (Lee) (1908-1976) (stories)
- See www.mysteryfile.com/RMartin/Pronzini.html
- Martinez, Pete [i.e., Pedro Pablo Martinez] (1894-1971) (art)
- See pulpartists.com/Martinez.html
- Martyn, Wyndham; pseudonym of William Henry Martin Hosken (1874-1963) (stories)
- See bearalley.blogspot.co.uk/2007/07/wyndham-martyn-biographical-notes.html
- Marx, Groucho [i.e., Julius Marx] (1895-1977) (stories)
- See en.wikipedia.org/wiki/Groucho_Marx
- Masero, Tony (fl. 1970s-2010s) (art)
- See www.artnillustration.com
- Mason, Elmer Brown (1877-1955) (stories)
- See pulpflakes.blogspot.com/2012/10/ElmerBMason.html
- Mason, (Francis) Van Wyck (1901-1978) (stories)
- Mystery writer. Born in Boston, Massachusetts; died in Bermuda.
- Masur, Harold Q. (1909-2005) (stories)
- See en.wikipedia.org/wiki/Harold_Q._Masur
- Mathers, James (1936-2014) (stories)
- See www.imdb.com/name/nm0558483
- Matheson, Richard (Burton) (1926-2013) (stories)
- See www.sf-encyclopedia.com/entry/matheson_richard
- Mathison, Volney G. (1897-1965) (stories)
- See www.sf-encyclopedia.com/entry/mathison_volney_g
- Matteson, H(erman) H(oward) (1876-1951) (stories)
- Author, ships surgeon, surgeon to Central American explorers and inmates in federal penitentaries; radio broadcaster. Born in Grundy County, Illinois; lived in Los Angeles, California.
- Maupassant, (Henri René Albert) Guy de (1850-1893) (stories)
- See en.wikipedia.org/wiki/Guy_de_Maupassant
- Maury, Magruder (Gordon) (1878-1948) (stories)
- Journalist. Born in Philadelphia, Pennsylvania; died in Bethesda, Maryland.
- Maxon, Rex (Hayden) (1892-1973) (stories) (art)
- See pulpartists.com/Maxon.html
- Mayan, Earl Eugene (1916-2009) (stories) (art)
- See pulpartists.com/Mayan.html
- Mayhar, Ardath (Frances Hurst) (1930-2012) (stories)
- See www.sf-encyclopedia.com/entry/mayhar_ardath
- Maynard, Guy L. (fl. 1920s-1940s) (stories)
- California writer.
- McAbee, K. G. (fl. 1990s-2010s) (stories)
- See kgmcabee.blogspot.co.uk
- McArdle, Jay [i.e., James Nivison McArdle] (1899-1960) (art)
- See pulpartists.com/McArdle.html
- McBlair, Robert (fl. 1910s-1940s) (stories)
- Perhaps the McBlair from New York (1888-1976).
- McCann, Gerald (Patrick) (1916-1995) (art)
- See pulpartists.com/McCannG.html
- McCarthy, Frank (C.) (1924-2002) (art)
- See en.wikipedia.org/wiki/Frank_McCarthy_(artist)
- McCauley, Harold W(illiam) (1913-1977) (art)
- See pulpartists.com/McCauley.html
- McClary, Thomas Calvert (1909-1972) (stories)
- See www.sf-encyclopedia.com/entry/mcclary_thomas_calvert
- McClusky, Thorp (1906-1975) (stories) (assoc.)
- Free-lance writer, former editor of Motor magazine; also wrote juveniles and a book on chiropractics. Studied music at Syracuse University. During the 1960s he lived in Atlantic Highlands, New Jersey. Probably died in Eatontown, Monmouth, New Jersey.
- McCoy, Max (1958- ) (stories)
- See www.sf-encyclopedia.com/entry/mccoy_max
- McCulley, Johnston (1883-1958) (stories)
- Prolific pulp writer, mystery writer, screenwriter, creator and author of Zorro novels. Born in Ottawa, Illinois; died in California.
- McDermott, H. Charles; pseudonym (fl. 1930s-1940s) (stories)
- Wrote detective and western stories while serving 10-20 for robbery.
- McDowell, (Robert) Emmett (1914-1975) (stories)
- See desturmobed.blogspot.co.uk/2011/12/robert-emmett-mcdowell.html
- McFarlane, Arthur E(merson) (1876-1945) (stories)
- Novelist. Born in Islington, Ontario; died in New York City.
- McFarlane, (Charles) Leslie (1902-1977) (stories)
- Newspaperman; prolific hack; also author of Hardy Boys stories under name of Franklin W. Dixon. Born in Carleton Place, Ontario, Canada; died in Whitby, Ontario, Canada.
- McGaughey, Dudley Dean (1909-1986) (stories)
- Born in Rialto, California; died in Laguna Beach, California.
- McGillivray, Ray (fl. 1920s-1940s) (stories)
- Traveller and sportsman. Lived in Citronelle, Alabama.
- McGinnis, Vera (1892-1990) (stories)
- See www.cowgirl.net/portfolios/vera-mcginnis
- McGivern, William P(eter) (1922-1982) (stories)
- See www.sf-encyclopedia.com/entry/mcgivern_william_p
- McGrew, Donald Francis (1886-1955) (stories)
- See pulpflakes.blogspot.com/2019/07/donald-francis-mcgrew-author-journalist.html
- McGuinness, James Kevin (1893-1950) (stories)
- See en.wikipedia.org/wiki/James_Kevin_McGuinness
- McIntyre, John T(homas) (1871-1951) (stories)
- Born and died in Philadelphia.
- McKechnie, N(eil) K(enneth) (1873-1951) (art)
- Born in England; educated in London, Germany and Paris; lived in Toronto.
- McKell, James C(ook) (1884-1956) (art)
- See pulpartists.com/McKell.html
- McKelvey, Nat W. (1914- ) (stories)
- Journalist and writer. From Arizona.
- McKillips, Budd L. (fl. 1920s-1930s) (stories)
- See socialjusticehistory.org/projects/alww/index.php?title=McKILLIPS,_Budd_L.
- McLaren, Alex (fl. 1920s-1930s) (stories)
- Perhaps business agent Alex McLaren (1885-1940).
- McMillan, Duncan (Robert) (1895-1943) (art)
- See pulpartists.com/McMillan.html
- McNagny, Rob(ert) Reed (1884-?) (stories)
- Indiana author.
- McNeil, (Henry) Everett (1862-1929) (stories)
- See www.sf-encyclopedia.com/entry/mcneil_everett
- McNutt, William Slavens (1885-1938) (stories)
- born in Urbana, Illinois; died in La Canada, CA.
- McWilliams, Alden S(purr) (1916-1993) (art)
- See pulpartists.com/McWilliams.html
- Meade, L. T.; pseudonym of Elizabeth Thomasina Meade Smith (1844-1914) (stories)
- See www.sf-encyclopedia.com/entry/meade_l_t
- Means, Elliott (Anderson) (1905-1962) (art)
- Born in Stamford, Texas; died in New York City.
- Meares, Leonard F(rank) (1921-1993) (stories)
- Vastly prolific Australian author, mostly of westerns (over 700 novels).
- Mearson, Lyon (1888-1966) (stories)
- See www.sf-encyclopedia.com/entry/mearson_lyon
- Meeker, Ezra (1830-1928) (stories) (assoc.)
- See en.wikipedia.org/wiki/Ezra_Meeker
- Megargee, Lon [i.e., Alonzo (Lon) Megargee III] (1883-1960) (art)
- See www.a-1beerprints.com/HTML/Lon%20Megargee.html
- Meilink, William (1903-1953) (art)
- See pulpartists.com/Meilink.html
- Meola, John (Constantino) (1916-1993) (art)
- See pulpartists.com/Meola.html
- Merha, Lester Wayne (1912-2000) (stories)
- See rmoa.unm.edu/docviewer.php?docId=wyu-ah07357.xml
- Mérimée, Prosper (1803-1870) (stories)
- See en.wikipedia.org/wiki/Prosper_M%C3%A9rim%C3%A9e
- Merril, Judith [originally Josephine Juliet Grossman] (1923-1997) (stories)
- See www.sf-encyclopedia.com/entry/merril_judith
- Merrill, Harrison R. (fl. 1920s) (stories)
- See www.sf-encyclopedia.com/entry/merrill_harrison_r
- Mersereau, John (1898-1989) (stories)
- See www.ruemorguepress.com/authors/mersereau.html
- Merwin, Sam(uel Kimball), Jr. (1910-1996) (stories)
- See www.sf-encyclopedia.com/entry/merwin_sam_jr
- Merwin, Samuel (Kimball) (1874-1936) (stories)
- Born in Evanston, Illinois, died in New York City; educated at Northwestern University; contributed many short stories and serials to magazines. Father of Sam Merwin, Jr..
- Millard, Joseph J(ohn) (1908-1989) (stories)
- See bearalley.blogspot.co.uk/2010/09/joe-millard.html
- Miller, (Mabel) Elizabeth York (1879-1949) (stories)
- Born in Washington, D.C.; a journalist and writer; became a naturalized British citizen in 1934; died in Maidstone, England.
- Miller, Tevis (1913-1983) (stories)
- Graduate of Western State College, Colorado; died in Portland, Oregon; author of westerns.
- Miller, Warren Hastings (1876-1960) (stories)
- See pulpflakes.blogspot.com/2013/02/biography-of-warren-hastings-miller.html
- Millholland, Ray(mond Albert) (1894-1956) (stories)
- See pulpflakes.blogspot.co.uk/2017/03/ray-millholland-engineer-sailor-author.html
- Milnes, Richard Monckton (, 1st Baron Houghton) (1809-1885) (stories)
- See en.wikipedia.org/wiki/Richard_Monckton_Milnes,_1st_Baron_Houghton
- Milton, John (1608-1674) (stories)
- See en.wikipedia.org/wiki/John_Milton
- Mines, Samuel (1909-1986) (stories)
- See www.sf-encyclopedia.com/entry/mines_samuel
- Mitchell, Arthur (Roy) (1889-1977) (stories) (art)
- See pulpartists.com/Mitchell.html
- Moline, Edward (John) [born Carl John Edwin Moline] (1908-1979) (art)
- See pulpartists.com/Moline.html
- Monahan, P(atrick) J(ohn) (1882-1931) (art)
- See pulpartists.com/Monahan.html
- Moneypenny, D(avid) H(ixon) (1900-1976) (art)
- See pulpartists.com/Moneypenny.html
- Montana, Duke; house pseudonym (1927-2010) (stories)
- See bearalley.blogspot.co.uk/2010/05/richard-conroy.html
- Montgomery, Rutherford (George) (1894-1985) (stories)
- See www.sf-encyclopedia.com/entry/montgomery_rutherford
- Montgomery, Vaida Stewart (née Boyd) (1888-1959) (stories)
- See www.lib.utexas.edu/taro/smu/00175/smu-00175.html
- Moore, [Captain] Frederick Ferdinand (1877-1947) (stories)
- Editor, author, sailor, civilian scout, war correspondent. One of the intelligence officers dispatched by the United States to Siberia in the summer of 1918. Briefly married to Eleanor Gates. Research on this man is difficult, hampered by the presence of author Frederick Moore (1877-1956?). Even the Library of Congress has treated the two men as being the same. Frederick Ferdinand Moore was born in Concord, New Hampshire; apparently still alive in 1954.
- Moore, Samuel Taylor (1893-1974) (stories)
- Author, journalist, retired Air-Force Colonel. Born in Westfield, Massachusetts.
- More, [Sir] Thomas (1478-1535) (stories)
- See www.sf-encyclopedia.com/entry/more_sir_thomas
- Morey, Leo [i.e., Leopoldo Morey y Pena] (1899-1965) (art)
- See pulpartists.com/Morey.html
- Morey, Walt(er Nelson) (1907- ) (stories)
- A writer best known for his animal stories such as Gentle Ben (1965) and Kavik, the Wolf Dog (1968). He was born in Hoquiam, Washington.