| Manster Mansion | — | EBS 1TV | 52 |
| Manu | March 3, 1990 | La Cinq | 104 |
| Manyu Scroll | July 12, 2011 | — | 12 |
| Mao | April 4, 2026 | — | 26 |
| Mao Mao: Heroes of Pure Heart | July 1, 2019 | Cartoon Network | 40 |
| Maoyu | January 5, 2013 | Tokyo MX | 12 |
| Maple Town | January 19, 1986 | TV Asahi | 52 |
| MapleStory | October 7, 2007 | TV Tokyo | 26 |
| Marathon Prince | — | CCTV-14 Children | 52 |
| Marblegen | — | — | — |
| Marcelino Bread and Wine | August 29, 2001 | RAI, Grupo Televisa, TF1, Televisión Española | 78 |
| March Comes In Like a Lion | October 8, 2016 | NHK General TV | 44 |
| Mardock Scramble | — | — | — |
| Marginal #4: Kiss kara Tsukuru Big Bang | January 12, 2017 | — | — |
| Marginal Prince | October 1, 2006 | — | 13 |
| Maria Holic | January 4, 2009 | — | 24 |
| Maria the Virgin Witch | January 11, 2015 | — | 12 |
| Maria-sama ga Miteru | January 7, 2004 | TV Tokyo | 44 |
| Marianna | — | — | — |
| Marias barn | December 1, 1987 | SVT1 | 24 |
| Marie & Gali | March 31, 2009 | NHK Educational TV | — |
| Marika's Love Meter Malfunction | April 6, 2026 | — | 8 |
| Marine Boy | October 6, 1966 | Fuji Television, TBS Television | — |
| Mario Netas | — | — | — |
| Marmalade Boy | March 13, 1994 | TV Asahi | 76 |
| Marriagetoxin | April 7, 2026 | — | 13 |
| Mars Daybreak | April 1, 2004 | — | 26 |
| Mars Red | April 6, 2021 | — | 13 |
| Marsupilami | September 18, 1993 | CBS | 29 |
| Martha Speaks | September 1, 2008 | PBS Kids, TVO Media Education Group | 96 |
| Martian Successor Nadesico | October 1, 1996 | TV Tokyo | 26 |
| Martin Morning | August 25, 2003 | France 3 | 104 |
| Martin Mystery | October 1, 2003 | Rai 2, YTV, M6 | 66 |
| Martine | August 27, 2012 | M6 | 52 |
| Marude Dameo | November 2, 1991 | — | 47 |
| Marvel Anime | October 1, 2010 | Animax, G4 | 48 |
| Marvel Disk Wars: The Avengers | April 2, 2014 | — | 51 |
| Marvel Future Avengers | July 22, 2017 | — | — |
| Marvel Super Hero Adventures | October 13, 2017 | — | — |
| Marvel Zombies | September 24, 2025 | Disney+ | 4 |
| Marvel's Avengers Assemble | May 26, 2013 | Disney XD | 127 |
| Marvel's Spider-Man | August 19, 2017 | Disney XD | 58 |
| Marvelous Melmo | October 3, 1971 | — | 26 |
| Marvin the Tap-Dancing Horse | March 5, 2000 | Cartoon Network, PBS Kids | 26 |
| Mary Shelley's Frankenhole | June 27, 2010 | Adult Swim, Cartoon Network | 20 |
| Mary, Mungo and Midge | October 7, 1969 | BBC One | 13 |
| Mary-Kate and Ashley in Action! | October 20, 2001 | American Broadcasting Company | 26 |
| Maryoku Yummy | October 11, 2010 | Discovery Family | 26 |
| Masameer | — | — | — |
| Masameer County | July 1, 2021 | Netflix | 8 |
| Masamune Datenicle | May 2, 2016 | — | 6 |
| Masamune-kun's Revenge | January 5, 2017 | — | 24 |
| Masha and the Bear | January 7, 2009 | Russia-1 | 200 |
| Masha's Spooky Stories | 2014 | — | — |
| Masha's Tales | January 1, 2012 | — | — |
| Mashin Creator Wataru | January 12, 2025 | TX Network | — |
| Mashin Hero Wataru | April 15, 1988 | Nippon Television | 45 |
| Mashin Hero Wataru 2 | March 9, 1990 | — | 46 |
| Mashin Hero Wataru The Seven Spirits of Ryujinmaru | — | — | — |
| Mashiroiro Symphony | October 5, 2011 | — | 12 |