- Matlock, Mark (1963- ) (items) (chron.)
- See www.deviantart.com/matlocktheartist
- Matos, Melissa (fl. 2010s) (items) (chron.)
- See momtoast.com
- Matsuoka, Yoko (fl. 2010s) (items) (chron.)
- See www.m-y-designs.com
- Matsuura, Thersa (fl. 2010s-2020s) (items) (chron.)
- See www.thersamatsuura.com
- Matte, A(rianne) M(axine) (fl. 1990s-2010s) (items) (chron.)
- See www.ammatte.ca
- Matte, Andrew (fl. 2010s) (items)
- See bullspec.com/2009/11/27/sneak-peek-larchitecture-de-la-lune-the-french-translation-of-joe-menos-the-architecture-of-the-moon/
- Matteson, H(erman) H(oward) (1876-1951) (items) (chron.)
- Author, ship’s surgeon, surgeon to Central American explorers and inmates in federal penitentaries; radio broadcaster. Born in Grundy County, Illinois; lived in Los Angeles, California.
- Matthews, Araminta Star (fl. 2010s) (items) (chron.)
- See aramintastar.com
- Matthews, (James) Brander (1852-1929) (items) (chron.)
- See en.wikipedia.org/wiki/Brander_Matthews
- Matthews, G(eoff) R. (fl. 2020s) (items)
- See www.grmatthews.com
- Matthews, Jason (1951-2021) (items) (chron.)
- See en.wikipedia.org/wiki/Jason_Matthews_(novelist)
- Matthews, Patricia (Anne Klein) (1927-2006) (items) (chron.)
- See en.wikipedia.org/wiki/Patricia_Matthews
- Matthey, Cécile (1973- ) (items) (chron.)
- See www.caeciliana.ch
- Mattila, D(eborah) L. (fl. 2010s-2020s) (items) (chron.)
- See www.pw.org/content/deborah_l_mattila
- Maugham, W(illiam) Somerset (1874-1965) (items) (chron.)
- See en.wikipedia.org/wiki/W._Somerset_Maugham
- Maughan, Tim (fl. 2010s-2020s) (items) (chron.)
- See timmaughanbooks.com
- Maupassant, (Henri René Albert) Guy de (1850-1893) (items) (chron.)
- See en.wikipedia.org/wiki/Guy_de_Maupassant
- Mauro, Laura (fl. 2010s-2020s) (items) (chron.)
- See crunchyblanket.wordpress.com
- Mavin, John (fl. 2000s-2020s) (items) (chron.)
- See www.johnmavin.com
- Mavor, Elinor (c1936- ) (items) (chron.)
- See en.wikipedia.org/wiki/Elinor_Mavor
- Mavor, James W(att), Jr. (1923-2008) (items)
- See www.whoi.edu/main/obituaries/archive?tid=3622&cid=15786
- Mawhinney, Pete (fl. 2010s) (items) (chron.)
- See www.bookofpete.com/about
- Maxfield, Mary (fl. 2020s) (items) (chron.)
- See www.marymaxfield.com
- Maxon, P(ercy) B(urden) (1887-1941) (items) (chron.)
- Born in New Brunswick, Canada; died in Detroit; a reporter.
- Maxwell, Ann (Elizabeth Lowell) (1944- ) (items)
- See www.sf-encyclopedia.com/entry/maxwell_ann
- Maxwell, Everina (fl. 2020s) (items) (chron.)
- See everinamaxwell.com
- Maxwell, William (Keepers, Jr.) (1908-2000) (items)
- See en.wikipedia.org/wiki/William_Keepers_Maxwell_Jr.
- May, Edna; [i.e., Edna May Pettie] (1878-1948) (items) (chron.)
- See en.wikipedia.org/wiki/Edna_May
- May, Julian (Clare) (1931-2017); also known as Julian May Dikty (items) (chron.)
- See www.sf-encyclopedia.com/entry/may_julian
- May, Kim (fl. 2010s-2020s) (items) (chron.)
- See ninjakeyboard.blogspot.co.uk
- Mayakovsky, Vladimir (Vladimirovich) (1893-1930) (items) (chron.)
- See www.sf-encyclopedia.com/entry/mayakovsky_vladimir
- Mayan, Earl Eugene (1916-2009) (items) (chron.)
- See pulpartists.com/Mayan.html
- Mayer, Douglas W. F. (1919-1976) (items) (chron.)
- See fancyclopedia.wikidot.com/douglas-w-f-mayer
- Mayerik, Val (1950- ) (items) (chron.)
- See en.wikipedia.org/wiki/Val_Mayerik
- Mayers, Dan E. (1922-2014) (items) (chron.)
- See www.shakuhachi.com/LL-Mayers.html
- Mayette, Robert (P.) (fl. 2020s) (items) (chron.)
- See www.robertmayette.com
- Mayhar, Ardath (Frances Hurst) (1930-2012) (items) (chron.)
- See www.sf-encyclopedia.com/entry/mayhar_ardath
- Mayhew, Joseph (Thomas) (1942-2000) (items) (chron.)
- See fancyclopedia.org/Joe_Mayhew
- Maynard, L(en) H. (1953-2023); used pseudonym Maynard Sims (items) (chron.)
- See www.infinityplus.co.uk/misc/mands.htm
- Mayorga, Gabriel (Humberto) (1911-1988) (items) (chron.)
- See www.pulpartists.com/Mayorga.html
- Mayr, Dallas William (1946-2018); used pseudonym Jack Ketchum (items) (chron.)
- See en.wikipedia.org/wiki/Jack_Ketchum
- Mayr, Suzette (1967- ) (items) (chron.)
- See www.sf-encyclopedia.com/entry/mayr_suzette
- Mays, Thomas Allen (fl. 2000s-2010s) (items) (chron.)
- See grantvillegazette.com/author/mays_t
- Maysi, Kadra (1890-1969) (items) (chron.)
- See tellersofweirdtales.blogspot.com/2012/03/kadra-maysi-1890-1969.html
- Mazur, Carly Janine (fl. 2010s) (items) (chron.)
- See carlyjanine.com
- Mazza, Joan (fl. 1990s-2020s) (items) (chron.)
- See www.joanmazza.com
- Mbalia, Kwame (fl. 2020s) (items) (chron.)
- See www.kwamembalia.com
- Meacham, Beth (Ann) (1951- ) (items) (chron.)
- See www.sf-encyclopedia.com/entry/meacham_beth
- Mead, Harold (Charles Hugh) (1910-1997) (items) (chron.)
- See www.sf-encyclopedia.com/entry/mead_harold
- Mead, Michelle M. (fl. 2000s-2020s) (items) (chron.)
- See michellemmead.wordpress.com
- Mead, (Edward) Shepherd (1914-1994) (items)
- See www.sf-encyclopedia.com/entry/mead_shepherd
- Mead, Syd (1933-2019) (items)
- See en.wikipedia.org/wiki/Syd_Mead
- Meade, Malcolm (fl. 1950s) (items) (chron.)
- possibly a pseudonym.
- Meador, Amber Neko (fl. 2010s) (items) (chron.)
- See amberneko.com
- Meadows, Foz (fl. 2010s-2020s) (items) (chron.)
- See fozmeadows.wordpress.com
- Meadows, Patrick (1934-2017) (items) (chron.)
- See www.patrick-meadows.com/obituary-english/
- Meaker, Marijane (Agnes) (1927-2022); used pseudonym Mary James (items)
- See en.wikipedia.org/wiki/Marijane_Meaker
- Meaney, John (1957- ) (items) (chron.)
- See www.sf-encyclopedia.com/entry/meaney_john
- Mears, Stefon (fl. 2010s-2020s) (items) (chron.)
- See www.stefonmears.com
- Mearson, Lyon (1888-1966) (items) (chron.)
- See www.sf-encyclopedia.com/entry/mearson_lyon
- Mechem, Kirke (Field) (1889-1985) (items) (chron.)
- See tellersofweirdtales.blogspot.co.uk/2017/05/kirke-mechem-1889-1985.html
- Meconis, Dylan (fl. 2000s-2010s) (items) (chron.)
- See www.dylanmeconis.com
- Medawar, P(eter) B(rian) (1915-1987) (items)
- See en.wikipedia.org/wiki/Peter_Medawar
- Medhurst, Richard G(eorge) (1920-1971) (items) (chron.)
- See psi-encyclopedia.spr.ac.uk/articles/psi-researchers-ii#George_Medhurst_1920-1971
- Medley, Guy (fl. 2010s-2020s) (items) (chron.)
- See guymedleyfiction.blogspot.com
- Medlock, Sandra L. (fl. 2020s) (items)
- See www.simonandschuster.com/authors/Sandra-L-Medlock/172933264
- Medney, Matthew (fl. 2020s) (items) (chron.)
- See www.heroprojects.io/about