| Work | Description | Characters |
|---|---|---|
| Monty Python’s Life of Brian | 1979 British comedy film directed by Terry Jones | 1 |
| Moomin comic strips | 1 | |
| Moomins | illustrated children's novels series by Tove Jansson | 1 |
| Moomins | picture books series by Tove Jansson | 1 |
| Moominsummer Madness | book by Tove Jansson | 1 |
| Moominvalley in November | book by Tove Jansson | 1 |
| Moonlight | 2016 film by Barry Jenkins | 1 |
| Moonraker | 1979 James Bond film by Lewis Gilbert | 1 |
| Moral Orel | American animated television series | 1 |
| More Fun Comics | comic | 1 |
| More Pep | 1936 film by Dave Fleischer | 1 |
| More Tribbles, More Troubles | episode of the animated Star Trek TV series | 6 |
| Moriarty | book by Anthony Horowitz | 1 |
| Moriarty the Patriot | Japanese anime television series | 1 |
| Moriarty the Patriot | Japanese manga series | 1 |
| Morning, Noon and Night | 1933 film by Dave Fleischer | 1 |
| Mortal Kombat | 2011 video game | 3 |
| Mortal Kombat | 1995 US action film directed by Paul W. S. Anderson | 4 |
| Mortal Kombat | video game series | 5 |
| Mortal Kombat | 1992 video game | 3 |
| Mortal Kombat 11 | 2019 fighting video game developed by NetherRealm Studios | 5 |
| Mortal Kombat 4 | video game | 1 |
| Mortal Kombat: Annihilation | 1997 US action film directed by John R. Leonetti | 3 |
| Mortal Kombat Arcade Kollection | 2011 video game | 1 |
| Mortal Kombat: Armageddon | video game | 3 |
| Mortal Kombat: Conquest | television series | 1 |
| Mortal Kombat: Deadly Alliance | video game | 1 |
| Mortal Kombat: Deception | video game | 1 |
| Mortal Kombat: Defenders of the Realm | television series | 1 |
| Mortal Kombat Gold | 1999 video game | 1 |
| Mortal Kombat II | 1993 competitive fighting game | 2 |
| Mortal Kombat: Legacy | television series | 2 |
| Mortal Kombat: Shaolin Monks | video game | 1 |
| Mortal Kombat Trilogy | 1996 video game | 4 |
| Mortal Kombat vs. DC Universe | video game | 5 |
| Mortal Kombat X | 2015 fighting video game | 5 |
| Mortynight Run | episode of Rick and Morty (S2 E2) | 1 |
| Mosaic | Book by Jeri Taylor, from 1996 | 7 |
| Mosè in Egitto | opera by Gioachino Rossini | 1 |
| Moses | opera by Myroslav Skoryk | 1 |
| Moses | opera by Anton Rubinstein | 1 |
| Moses | 1995 miniseries directed by Roger Young | 1 |
| Moses | poem by Ivan Franko | 1 |
| Moses, Man of the Mountain | novel by Zora Neale Hurston | 1 |
| Moses the Lawgiver | book by Thomas Keneally | 1 |
| Moses the Lawgiver | 1974 film by Gianfranco De Bosio | 1 |
| Moses und Aron | 1975 film by Straub-Huillet | 1 |
| Moses und Aron | opera by Arnold Schönberg | 1 |
| Mostly Harmless | 1992 book by Douglas Adams | 1 |
| Mother Goose Land | 1933 film by Dave Fleischer | 1 |
| Mountain of Faith | 2007 video game | 1 |
| Mowgli: Legend of the Jungle | 2018 film directed by Andy Serkis | 4 |
| Mr. Bean | British comedy television series | 1 |
| Mr. Bean | an animated television series of Mr. Bean | 1 |
| Mr. Bean's Holiday | 2007 British comedy film directed by Steve Bendelack | 1 |
| Mr. Incredible and Pals | 2005 animated short film directed by Roger Gould | 1 |
| Mr. Robot | American drama–thriller television series | 16 |
| Mrs McGinty's Dead | book | 1 |
| Much Ado About Boimler | episode of Star Trek: Lower Decks | 1 |
| Mudd in Your Eye | Book by Jerry Oltion, from 1997 | 5 |
| Mudd's Women | 1966 episode of Star Trek: The Original Series (S1 E6) directed by Harvey Hart | 6 |
| Mufasa: The Lion King | 2024 CGI film directed by Barry Jenkins | 1 |
| Muhteşem Yüzyıl | Turkish telenovela | 2 |
| Mulan | 1998 American animated musical action-comedy-drama film produced by Walt Disney Feature Animation | 2 |
| MultiVersus | upcoming 2022 video game developed by Player First Games | 2 |
| Muppet Treasure Island | 1996 film directed by Brian Henson | 1 |
| Murder in Mesopotamia | book | 1 |
| Murder on the Links | murder-mystery novel by Agatha Christie | 1 |
| Murder on the Orient Express | Novel by Agatha Christie | 1 |
| Mushishi | Japanese manga series | 2 |
| Mushoku Tensei | Japanese manga series | 1 |
| Mushoku Tensei | Japanese anime television series | 1 |
| Mushoku Tensei | Japanese light novel series | 1 |
| Musical Mountaineers | 1939 film by Dave Fleischer | 1 |
| Mutant Turtles: Superman Legend | Japanese original video animation series | 1 |
| Mutiny on the Enterprise | book by Robert E. Vardeman | 4 |
| My Enemy, My Ally | book by Diane Duane | 4 |
| My Fair Lady | musical based upon George Bernard Shaw's Pygmalion | 1 |
| My Friend the Monkey | 1939 film by Dave Fleischer | 1 |
| My Hero Academia | Japanese anime television series | 31 |
| My Hero Academia | Japanese media franchise | 1 |
| My Hero Academia | Japanese manga series | 20 |
| My Hero Academia: Heroes Rising | 2019 Japanese anime film | 2 |
| My Hero Academia: Two Heroes | 2018 Japanese animated superhero film | 4 |
| My Little Monster | Japanese manga series | 1 |
| My Little Monster | Japan anime television series | 1 |
| My Little Pony: A New Generation | 2021 film directed by Robert Cullen and José Luis Ucha | 1 |
| My Little Pony: Equestria Girls | 2013 animated movie directed by Jayson Thiessen | 1 |
| My Little Pony: Friendship Is Magic | Canadian-American television series based on the Hasbro franchise | 7 |
| My Love Story!! | Japanese manga series | 1 |
| My Love Story!! | 2015 Japanese film directed by Hayato Kawai | 3 |
| My Neighbor Seki | Japanese anime television series | 1 |
| My Neighbor Seki | Japanese manga series | 1 |
| My Neighbor Totoro | 1988 film directed by Hayao Miyazaki | 1 |
| Myriad Colors Phantom World | Japanese light novel series | 1 |
| Myriad Colors Phantom World | Japanese anime television series | 1 |
| My So-Called Life | American teen drama television series | 1 |
| Mystery of Mamo | 1978 animated film by Sōji Yoshikawa | 1 |
| Mystic Square | The fifth game of the Touhou Project, a series of bullet hell shoot-em-ups. | 2 |
| My Sweet Tyrant | Japanese anime television series | 1 |