- MacMahon, William Marcus (1876-1931) (items) (chron.)
- See www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=89270900
- MacMillan, Ian (Travis) (1941-2008) (items)
- See en.wikipedia.org/wiki/Ian_MacMillan_(author)
- McMillan, P. L. (fl. 2010s-2020s) (items) (chron.)
- See plmcmillan.com
- McMillion-Nering, Deborah (fl. 1990s-2010s) (items) (chron.)
- See www.hotelmidnight.com
- McMonigal, Rob (fl. 2010s) (items) (chron.)
- See www.panelpatter.com
- McMullen, Catherine S. (c1989- ) (items) (chron.)
- See www.goodreads.com/author/show/7250927.C_S_McMullen
- McMullen, Sean (Christopher) (1948- ); used pseudonym Roger Wilcox (items) (chron.)
- See www.sf-encyclopedia.com/entry/mcmullen_sean
- McMyne, Mary (fl. 2010s) (items) (chron.)
- See marymcmyne.com
- MacNab, Brynn (fl. 2010s) (items) (chron.)
- See www.brynnmacnab.blogspot.com
- McNabb, Jamie (fl. 2010s-2020s) (items) (chron.)
- See jamiemcnabb.com
- McNabb, Vincent (1868-1943) (items)
- See en.wikipedia.org/wiki/Vincent_McNabb
- McNail, Stanley (Duane) (1918-1995) (items) (chron.)
- See desturmobed.blogspot.com/2021/04/stanley-mcnail.html
- Macnair, Ben (fl. 2000s-2010s) (items) (chron.)
- See atlanteanpublishing.fandom.com/wiki/Ben_Macnair
- McNamara, Alena (fl. 2010s) (items) (chron.)
- See aamcnamara.livejournal.com
- McNamee, Paul R. (fl. 2000s-2020s) (items) (chron.)
- See paulmcnamee.blogspot.co.uk
- McNaughton, Brian (1935-2004) (items) (chron.)
- See en.wikipedia.org/wiki/Brian_McNaughton
- MacNaughton, Laurence (fl. 2010s) (items) (chron.)
- See laurencemacnaughton.com
- MacNeil, Colin (fl. 1990s) (items) (chron.)
- See en.wikipedia.org/wiki/Colin_MacNeil
- McNeil, (Henry) Everett (1862-1929) (items) (chron.)
- See www.sf-encyclopedia.com/entry/mcneil_everett
- McNeil, John (fl. 2020s) (items) (chron.)
- See www.johnmcneil.me
- McNeile, H(erman) C(yril) (1888-1937) (items) (chron.)
- See en.wikipedia.org/wiki/H._C._McNeile
- McNeill, Graham (c1971- ) (items) (chron.)
- See www.sf-encyclopedia.com/entry/mcneill_graham
- McNeill, Warren A(lbert) (1903-1998) (items) (chron.)
- See archives.library.vcu.edu/repositories/5/resources/94
- McNeilly, Sara K. (fl. 2010s) (items) (chron.)
- See plus.google.com/+SaraKMcNeilly
- McNelly, [Dr.] Willis E(verett) (1920-2003) (items) (chron.)
- See www.sf-encyclopedia.com/entry/mcnelly_willis_e
- McNevin, Don (fl. 2010s) (items) (chron.)
- See donswordsphere.wordpress.com
- MacNichol, Kenneth (Hartley) (1887-1955) (items) (chron.)
- See tellersofweirdtales.blogspot.co.uk/2013/11/om-cabral-1887-1955.html
- McNish, Cliff (1962- ) (items) (chron.)
- See en.wikipedia.org/wiki/Cliff_McNish
- MacNutt, Toby (fl. 2010s-2020s) (items) (chron.)
- See www.tobymacnutt.com
- McPhail, Daniel (Lawrence) (1916-1984) (items) (chron.)
- See fancyclopedia.org/dan-mcphail
- McPhail, Mike (fl. 2000s-2010s) (items)
- See www.mcp-concepts.com
- McPhee, John (Angus) (1931- ) (items)
- See en.wikipedia.org/wiki/John_McPhee
- McPheeters, Sam (1969- ) (items)
- See en.wikipedia.org/wiki/Sam_McPheeters
- Macpherson, Hector Copland (1888-1956) (items)
- See en.wikipedia.org/wiki/Hector_Macpherson_(astronomer)
- MacQuarrie, Peter (1969- ) (items) (chron.)
- See petermacquarrie.com
- McQuay, Mike; [i.e., Michael Dennis McQuay] (1949-1995) (items) (chron.)
- See www.sf-encyclopedia.com/entry/mcquay_mike
- McQue, Ian (fl. 2010s) (items) (chron.)
- See mcqueconcept.blogspot.co.uk
- McQueen, James (Stuart) (1934-1998) (items) (chron.)
- Born and died in Tasmania.
- McQuinn, Donald E. (1930- ) (items)
- See www.sf-encyclopedia.com/entry/mcquinn_donald_e
- McQuiston, Rick (fl. 2000s-2020s) (items) (chron.)
- See many-midnights.webs.com
- MacRae, Andrew (fl. 2010s) (items) (chron.)
- See www.murdermisdirected.com
- McRae, Bruce (1954- ) (items) (chron.)
- See www.poetrymagazine.com/editors_choice/summer12/bruce_mcrae_page1.htm
- MacRae, Michael (fl. 2010s) (items) (chron.)
- See themichaelmacrae.deviantart.com
- McRae, Nick (fl. 2010s) (items) (chron.)
- See www.nickmcrae.com
- McRob, Blaze (fl. 2010s) (items) (chron.)
- See www.blazemcrob.com
- McSherry, Quinn (fl. 2010s) (items) (chron.)
- See www.mcsherryillustration.com
- McSwain, Ryan (fl. 2010s) (items) (chron.)
- See ryanmcswain.com
- McSweeney, Madison (fl. 2010s-2020s) (items) (chron.)
- See madisonmcsweeney.com
- Macumber, Justin R. (fl. 2000s-2010s) (items) (chron.)
- See www.justinmacumber.com
- McVey, Alex (fl. 2000s-2010s) (items) (chron.)
- See en.wikipedia.org/wiki/Alex_McVey
- McVey, David (fl. 1990s-2010s) (items) (chron.)
- See www.david-mcvey.co.uk
- MacWalter, Thom (1887-1963); used pseudonym Victor MacClure (items) (chron.)
- See www.sf-encyclopedia.com/entry/macclure_victor
- McWhorter, Greg (fl. 2010s-2020s) (items) (chron.)
- See gregmcwhorter.blogspot.com
- McWilliams, Alden S(purr) (1916-1993) (items) (chron.)
- See pulpartists.com/McWilliams.html
- Madden, (Jerry) David (1933- ) (items) (chron.)
- See en.wikipedia.org/wiki/David_Madden_(novelist)
- Madden, Sean (fl. 1990s-2010s); used pseudonym Spiffopops (items) (chron.)
- See www.seanmaddenart.com
- Maddock, Larry; pseudonym of Jack Jardine (1931-2009) (items) (chron.)
- See www.sf-encyclopedia.com/entry/maddock_larry
- Maddox, Mark (1961- ) (items) (chron.)
- See maddoxplanet.com
- Maddox, Tom; [i.e., Daniel Thomas Maddox] (1945-2022) (items) (chron.)
- See www.sf-encyclopedia.com/entry/maddox_tom
- Maddren, Gerry; [i.e., Geraldine Stowell Maddren] (1924-2020) (items) (chron.); name also given as Jerry Maddren.
- See www.dignitymemorial.com/obituaries/burbank-ca/geraldine-maddren-9217056
- Maddux, Rachel (1912-1983) (items) (chron.)
- See www.sf-encyclopedia.com/entry/maddux_rachel
- MA|DE; pseudonym of Mark Laliberte & Jade Wallace (fl. 2020s) (items) (chron.)
- See ma-de.ca
- Madeleine, Julia (fl. 2010s) (items) (chron.)
- See www.goodreads.com/author/show/1421418.Julia_Madeleine
- Madle, Robert A(lbert) (1920-2022) (items) (chron.)
- See fancyclopedia.org/bob-madle
- Madrigano, Clara (fl. 2020s) (items) (chron.)
- See thedarkmagazine.com/authors/clara-madrigano
- Madsen, Axel (1930-2007) (items)
- See www.sf-encyclopedia.com/entry/madsen_axel
- Mae, Samuel (fl. 2010s) (items) (chron.)
- See www.samuelmae.info