Authors
- Kyoko M.
- Jonathan Maberry
- G. R. Macallister
- Ralph Macchio
- Carmen Maria Machado
- Helen MacInnes
- David Alan Mack
- Bracken MacLeod
- Patrick Macnee
- Paul Magrs
- Jim Mahfood
- Tim Major
- Josh Malerman
- Ronald Malfi
- Usman T. Malik
- Michael Mallory
- Leonard Maltin
- Barry N. Malzberg
- Nick Mamatas
- Emily St John Mandel
- George Mann
- Matthew K. Manning
- Pablo Marcos
- David Marcum
- Daniel Marcus
- Phillip Margolin
- Jerry Margolin
- Juliet Marillier
- Jeff Mariotte
- Robert Markham
- Ari Marmell
- Margaret Maron
- Emma Marriott
- Ed W Marsh
- Philip Marsh
- Todd Marshall
- Helen Marshall
- Yann Martel
- Raul Martin
- Alan C. Martin
- George R.R. Martin
- Alan Martin
- George R. R. Martin
- Stephan Martinière
- Marvel
- Rhonda Mason
- Nathan Massengill
- Elizabeth Massie
- Marcos Mateu-Mestre
- Hannah Mathewson
- Brett Matthews
- Hugh Matthews
- Susan R. Matthews
- Ann Maulina
- Laura Mauro
- Kim May
- Bob Mayer
- William Patrick Maynard
- Andrew Mayne
- Kwame Mbalia
- Curt McAloney
- Paul McAuley
- Ed McBain
- Bob McCabe
- Helen McCarthy
- Una McCormack
- John McCrea
- Val McDermid
- Jack McDevitt
- Gregory Mcdonald
- Ian McDonald
- Chris McDonnell
- Robert E McGinnis
- Jon McGoran
- Tom McGrath
- Seanan McGuire
- Maura McHugh
- Maureen F. McHugh
- Gina McIntyre
- Dave McKean
- L.L. McKinney
- Jack McKinney
- Jesse McLean
- Anna-Marie McLemore
- John McLusky
- Jennifer McMahon
- Mike McMahon
- Steve McNiven
- Andy McVittie
- Syd Mead
- Denis Meikle
- William Meikle
- Ryan Meinerding
- Liane Merciel
- David Messina
- William Messner-Loebs
- Chris Metzen
- Gustav Meyrink
- J. Michael Straczynski
- Kara Mickelson
- China Miéville
- Mike Mignola
- John Milius
- Mark Millar
- Wade Miller
- Matthew Miller
- Ian Miller
- Steve Miller
- David Miller
- Tracey Miller-Zarneke
- Peter Milligan
- Tony Millionaire
- Pat Mills
- Denise Mina
- Rob Minkoff
- D. Thomas Minton
- Glen Mitchell
- Ken Mogg
- Premee Mohamed
- Jose Molina
- Stephen Molstad
- Hillary Monahan
- Mondo
- Michele Monro
- Chelsea Monroe-Cassel
- Elizabeth Moon
- Brian Mooney
- Michael Moorcock
- Warren Moore
- Alison Moore
- James A. Moore
- C.L. Moore
- Don Moore
- Stuart Moore
- Barbara Moore
- Donna Moore
- Alan Moore
- Jodi Moran
- Daniel Keys Moran
- Gus Moreno
- Kate Moretti
- Peter Morfoot
- Christopher Morgan
- Mark Morris
- Marcus Morris
- Brittney Morris
- Kim Moses
- Dirk W. Mosig
- Tara Moss
- Olly Moss