| Work | Description | Characters |
|---|---|---|
| Mario Clash | 1995 video game released by Nintendo for the virtual boy | 1 |
| Mario franchise | video game franchise | 5 |
| Mario Golf | 1999 sports game | 1 |
| Mario Golf | sports video game series | 1 |
| Mario Golf: Advance Tour | 2004 sports game | 1 |
| Mario Golf: Toadstool Tour | 2003 sports video game | 1 |
| Mario Golf: World Tour | 2014 sports game | 1 |
| Mario Is Missing! | 1993 video game | 2 |
| Mario Kart 64 | 1996 racing video game | 4 |
| Mario Kart 7 | 2011 racing video game | 2 |
| Mario Kart 8 | 2014 racing video game | 3 |
| Mario Kart 8 Deluxe | re-release of the Mario Kart 8 video game | 2 |
| Mario Kart Arcade GP | 2005 video game | 1 |
| Mario Kart Arcade GP 2 | 2007 video game | 1 |
| Mario Kart: Double Dash | 2003 racing video game | 2 |
| Mario Kart DS | 2005 racing video game | 1 |
| Mario Kart: Super Circuit | 2001 racing video game | 5 |
| Mario Kart Wii | 2008 racing video game by Nintendo | 2 |
| Mario & Luigi | video game series | 1 |
| Mario & Luigi: Bowser's Inside Story | 2009 video game | 1 |
| Mario & Luigi: Dream Team | 2013 video game | 1 |
| Mario & Luigi: Paper Jam | 2015 video game | 1 |
| Mario & Luigi: Partners in Time | 2005 video game | 1 |
| Mario & Luigi: Superstar Saga | 2003 video game | 1 |
| Mario no Photopi | video game | 1 |
| Mario Party | 1998 party video game | 3 |
| Mario Party 10 | 2015 party video game | 3 |
| Mario Party 2 | 1999 party video game | 3 |
| Mario Party 3 | 2000 party video game | 3 |
| Mario Party 4 | 2002 party video game | 3 |
| Mario Party 5 | 2003 party video game | 3 |
| Mario Party 6 | 2004 party video game | 3 |
| Mario Party 7 | 2005 party video game | 3 |
| Mario Party 8 | 2007 party video game | 3 |
| Mario Party 9 | 2012 party video game | 3 |
| Mario Party Advance | 2005 party video game | 1 |
| Mario Party DS | 2007 party video game | 2 |
| Mario Party: Island Tour | 2013 party video game | 2 |
| Mario Party: Star Rush | 2016 party video game | 2 |
| Mario Party: The Top 100 | 2017 video game | 2 |
| Mario & Sonic at the London 2012 Olympic Games | 2011 video game | 1 |
| Mario & Sonic at the Olympic Games | video game | 3 |
| Mario & Sonic at the Olympic Winter Games | 2009 sports video game | 1 |
| Mario & Sonic at the Rio 2016 Olympic Games | 2016 video game | 1 |
| Mario & Sonic at the Sochi 2014 Olympic Winter Games | 2013 sports video game | 1 |
| Mario's Picross | 1995 Game Boy game | 1 |
| Mario Sports Mix | 2011 sports video game | 1 |
| Mario Sports Superstars | 2017 video game | 1 |
| Mario Superstar Baseball | 2005 video game | 1 |
| Mario & Wario | 1993 video game | 2 |
| Marooned | Book by Christie Golden, from 1997 | 6 |
| Married... with Children | American television sitcom (1987-1997) | 1 |
| Martin Eden | novel by the American author Jack London | 1 |
| Martyr | Book by Peter David, from 1998 | 3 |
| Marvel Anime | 2010 anime series | 5 |
| Marvel Contest of Champions | free-to-play mobile game | 1 |
| Marvel Disk Wars: The Avengers | television anime series produced by Toei Animation and Walt Disney Japan, based on the Marvel Comics universe | 3 |
| Marvel Heroes | 2013 video game | 1 |
| Marvel Puzzle Quest | 2013 video game | 1 |
| Marvel's Avengers Assemble | animated series (2013-2019) | 2 |
| Marvel's Spider-Man | American superhero animated series | 1 |
| Marvel Strike Force | 2018 video game | 1 |
| Marvel Studios: Legends | 2021 television series produced by Marvel Studios | 4 |
| Marvel Super Heroes | 1995 video game | 2 |
| Marvel Super Heroes 4D | 2010 film | 1 |
| Marvel Super Heroes In War of the Gems | 1996 video game | 1 |
| Marvel Super Heroes vs. Street Fighter | 1997 video game | 1 |
| Marvel Super Hero Squad: The Infinity Gauntlet | 2010 video game | 1 |
| Marvel: Ultimate Alliance | 2006 video game | 3 |
| Marvel: Ultimate Alliance 2 | 2009 video game | 4 |
| Marvel vs. Capcom | a series of crossover fighting games | 2 |
| Marvel vs. Capcom 2: New Age of Heroes | video game | 11 |
| Marvel vs. Capcom 3: Fate of Two Worlds | video game | 5 |
| Marvel vs. Capcom: Clash of Super Heroes | 1998 video game | 2 |
| Marvel vs. Capcom: Infinite | video game | 7 |
| Mary, Queen of Scots | 2013 movie directed by Thomas Imbach | 1 |
| Masamune-kun's Revenge | Japanese manga series | 1 |
| Masamune-kun's Revenge | Japanese anime television series | 1 |
| Masks | episode of Avatar: The Last Airbender (S1 E6) | 1 |
| Masks | Book by John Vornholt | 5 |
| Mass Effect | 2007 video game | 3 |
| Mass Effect | video game series | 3 |
| Mass Effect 2 | 2010 video game | 4 |
| Mass Effect 2: Lair of the Shadow Broker | 2010 downloadable content | 1 |
| Mass Effect 3 | 2012 video game | 4 |
| Mass Effect Galaxy | 2009 video game | 1 |
| Master and Apprentice | novel by Claudia Gray | 1 |
| Masters of the Universe | American media franchise | 1 |
| Matilda | 1988 children's book by Roald Dahl | 1 |
| Matilda | 1996 American fantasy film by Danny DeVito | 1 |
| Matilda the Musical | 2011 musical | 1 |
| Max Payne | 2008 film by John Moore | 1 |
| Max Payne | 2001 third-person shooter video game | 1 |
| Max Payne 2: The Fall of Max Payne | 2003 video game | 1 |
| Max Payne 3 | 2012 video game | 1 |
| Mean Girls | Musical based on the 2004 film Mean Girls | 1 |
| Mean Girls | 2004 American teen comedy film directed by Mark Waters | 5 |
| Megamind | 2010 American 3D computer-animated superhero comedy film directed by Tom McGrath | 2 |
| Megamind | 2010 video game | 2 |
| Megamind: Mega Team Unite | 2010 video game | 2 |