- Mantley, John (Truman) (1920-2003) (items) (chron.)
- See www.sf-encyclopedia.com/entry/mantley_john
- Manuel, Derek (fl. 2010s) (items) (chron.)
- See www.dmthewriter.com
- Manukyan, Alexandra (fl. 1990s-2010s) (items) (chron.)
- See www.alexandramanukyan.com
- Manusos, Lyndsie (fl. 2010s-2020s) (items) (chron.)
- See lyndsiekay.wordpress.com
- Manvell, (Arnold) Roger (1909-1987) (items)
- See www.sf-encyclopedia.com/entry/manvell_roger
- Manyukhin, Vladimir (fl. 2010s-2020s) (items) (chron.)
- See mvn78.artstation.com
- Manzarek, Ray(mond Daniel, Jr.) (1939-2013) (items)
- See en.wikipedia.org/wiki/Ray_Manzarek
- Manzetti, Alessandro (fl. 2010s-2020s) (items) (chron.)
- See www.alessandromanzetti.net
- Manzieri, Maurizio (fl. 1990s-2020s) (items) (chron.)
- See www.manzieri.com
- Maor, Edith (fl. 2010s) (items) (chron.)
- See grantvillegazette.com/author/maor_e
- Map, Walter; [i.e., Gualteri Mapes] (1137-1209) (items)
- See en.wikipedia.org/wiki/Walter_Map
- Mar, Kathy (1951- ) (items)
- See en.wikipedia.org/wiki/Kathy_Mar
- Mar, Valeria Rodríguez (fl. 2010s) (items) (chron.)
- See valeriarodriguezmar.blogspot.co.uk
- Marbais, Amanda (fl. 2010s) (items) (chron.)
- See www.amandamarbais.com
- Marbarger, John P(orter) (1916-2006) (items)
- See www.findagrave.com/memorial/16545671/marbarger
- Marbel, Yoshira (c1984- ) (items) (chron.)
- See www.smashwords.com/profile/view/yoshiramarbel
- Marchand, Joy (fl. 2000s) (items) (chron.)
- See www.joymarchand.com
- Marchand, Richard (fl. 2000s) (items) (chron.)
- See richardmarchand.tumblr.com
- Marchese, Anthony (fl. 2010s) (items) (chron.)
- See alphaverse.blogspot.co.uk
- Marchetti, Lou(is J.) (1920-1992) (items) (chron.)
- See loumarchetti.com
- Marchioni, Mark; [i.e., Marco Enrico Marchioni] (1901-1987) (items) (chron.)
- See pulpartists.com/Marchioni.html
- March-Russell, Paul (fl. 2010s-2020s) (items) (chron.)
- See www.kent.ac.uk/secl/complit/staff/march-russell.html
- Marcinek, Jaroslaw (fl. 2010s) (items) (chron.)
- See yar0.deviantart.com
- Marckx, Eugene (fl. 2010s) (items) (chron.)
- See sites.google.com/a/newmyths.com/nmwebsite/contributors/eugene-marckx
- Marco, John (fl. 1990s-2010s) (items)
- See en.wikipedia.org/wiki/John_Marco
- Marconette, Walter E(arl) (1919-1988) (items) (chron.)
- See fancyclopedia.org/walter-e-marconette
- Marcotte, J(ill) N. (fl. 2010s) (items) (chron.)
- See jillmarcotte.wordpress.com
- Marcus, Daniel (L.) (fl. 1990s-2020s) (items) (chron.)
- See en.wikipedia.org/wiki/Daniel_Marcus
- Marcus, Daryl (fl. 2010s) (items) (chron.)
- See darylmarcus.wordpress.com
- Marcus, Jerry (1924-2005) (items) (chron.)
- See en.wikipedia.org/wiki/Jerry_Marcus
- Marek, Kurt W(ilhelm) (1915-1972); used pseudonym C. W. Ceram (items)
- See en.wikipedia.org/wiki/C._W._Ceram
- Margroff, Robert E(rvien) (1930-2015) (items) (chron.)
- See www.sf-encyclopedia.com/entry/margroff_robert_e
- Margulies, Leo (J.) (1900-1975) (items) (chron.)
- See en.wikipedia.org/wiki/Leo_Margulies
- Maria, Theresa “Mahella” (fl. 2010s) (items) (chron.)
- See unlaceddreams.yolasite.com
- Marie, Xtina (fl. 2010s) (items) (chron.)
- See xtinamarie746334456.wordpress.com
- Mariella, [Dr.] Raymond Peel (, Sr.) (1919-2010) (items) (chron.)
- See file770.com/?p=4030
- Marietta, Becky (fl. 2010s) (items) (chron.)
- See thebeckymarietta.blogspot.co.uk
- Marillier, Juliet (1948- ) (items) (chron.)
- See en.wikipedia.org/wiki/Juliet_Marillier
- Marin, Augusto (1921-2011) (items) (chron.)
- See articles.philly.com/2011-04-15/news/29421448_1_painter-lung-infection-murals
- Marín, Rafael; [i.e., Rafael Marín Trechera] (1959- ) (items) (chron.)
- See en.wikipedia.org/wiki/Rafael_Marín
- Mariner, Scott; pseudonym of C. M. Kornbluth & Frederik Pohl (fl. 1940s) (items) (chron.)
- See www.sf-encyclopedia.com/entry/mariner_scott
- Marins, José Mojica (1936-2020) (items)
- See en.wikipedia.org/wiki/José_Mojica_Marins
- Marion, Elizabeth; [i.e., Dora Elizabeth Marion Saunders] (1916-1989) (items) (chron.)
- Born in Washington state.
- Mariotte, Jeff(rey J.) (1955- ) (items) (chron.)
- See en.wikipedia.org/wiki/Jeff_Mariotte
- Marius, Soare (c1979- ) (items) (chron.)
- See www.runner44.deviantart.com
- Mark, Jan(et Marjorie) (1943-2006) (items)
- See www.sf-encyclopedia.com/entry/mark_jan
- Markham, (Charles) Edwin (Anson) (1852-1940) (items) (chron.)
- See en.wikipedia.org/wiki/Edwin_Markham
- Markham, Roylston (Miller) (1885-1950) (items) (chron.)
- See tellersofweirdtales.blogspot.com/2023/07/weird-tales-april-1923-part-two.html
- Markotin, Dimitri (fl. 2010s) (items) (chron.)
- See www.steamypunk.net/authors/dimitri_markotin/
- Markov, Georgi (c1980- ) (items) (chron.)
- See hofarts.deviantart.com
- Markov, Haralambi (fl. 2000s-2020s) (items) (chron.)
- See haralambimarkov.com
- Marks, C(hris) S. (fl. 2010s) (items)
- See www.csmarks.com
- Marley, Louise (née Campbell) (1952- ) (items) (chron.)
- See www.louisemarley.com
- Marlow, Gregory (fl. 2010s-2020s) (items) (chron.)
- See www.gregmarlow.com
- Marlow, Max; joint pseudonym of Diana Mary Bachmann & Christopher Nicole (items)
- See www.sf-encyclopedia.com/entry/marlow_max
- Marlowe, Spike (fl. 2010s) (items) (chron.)
- See spikemarlowe.wordpress.com
- Marlowe, Stephen; [born Milton Lesser] (1928-2008); previously known as Milton Lesser; used pseudonyms Adam Chase & S. M. Tenneshaw (items) (chron.)
- See en.wikipedia.org/wiki/Stephen_Marlowe
- Marlyn, John (1912-2005) (items) (chron.)
- See en.wikipedia.org/wiki/John_Marlyn
- Marmell, Ari (1974- ) (items) (chron.)
- See www.sf-encyclopedia.com/entry/marmell_ari
- Marmor, Arnold (1927-1988) (items) (chron.)
- Born and died in New York City.
- Marmur, Jacland (1901-1970) (items) (chron.)
- Author and explorer. Born in Sosnowiec, Poland; came to the United States in 1918; died in San Rafael, California (?).
- Maroon, Everett (fl. 2010s) (items) (chron.)
- See transplantportation.com
- Marquez, R. (fl. 2010s) (items) (chron.)
- See www.r-marquez.com
- Marquitz, Tim (fl. 2010s) (items) (chron.)
- See www.tmarquitz.com
- Marr, Melissa (1972- ) (items) (chron.)
- See en.wikipedia.org/wiki/Melissa_Marr
- Marriott, (Norman) Ronald (1922-1972) (items)
- See www.imdb.com/name/nm0550198/
- Marrs, John (fl. 2020s) (items)
- See www.johnmarrsauthor.com