| Mega Babies | October 10, 1999 | Fox Kids | 38 |
| Mega Man | September 11, 1994 | Broadcast syndication | 27 |
| Mega Man Star Force | October 5, 2006 | TV Tokyo | — |
| Mega Man: Fully Charged | August 5, 2018 | Cartoon Network, WildBrainTV | 26 |
| Megalobox | April 6, 2018 | — | 26 |
| MegaMan NT Warrior | March 4, 2002 | — | 209 |
| Meganebu! | October 6, 2013 | — | 12 |
| Megas XLR | 2002 | Cartoon Network | 26 |
| Megaton Musashi | October 1, 2021 | — | 28 |
| Megazone 23 | — | — | — |
| Meiji Gekken: 1874 | January 14, 2024 | — | 10 |
| Meiji Tokyo Renka | April 9, 2019 | — | 12 |
| Meimon! Daisan Yakyū-bu | October 20, 1988 | — | 40 |
| Meine Freundin Conni | June 13, 2012 | KiKA | 52 |
| Meine Liebe | November 4, 2004 | — | 26 |
| Mekakucity Actors | April 12, 2014 | — | 12 |
| Melatie | May 20, 2025 | Yle Areena | 4 |
| Melody of Oblivion | April 6, 2004 | — | 24 |
| Melody of the Boundary | — | — | — |
| Men in Black: The Series | October 11, 1997 | CBS, The WB | 53 |
| Meow Magic | April 14, 2021 | Carousel | 78 |
| Mera×Death: Shinigami to Boku no Ijō na Koi | January 5, 2027 | — | — |
| Merc Storia: The Apathetic Boy and the Girl in a Bottle | October 11, 2018 | — | 12 |
| Mercedes and the Waning Moon | January 2027 | — | — |
| Merlin the Magical Puppy | — | — | — |
| Mermaid Melody Pichi Pichi Pitch | April 5, 2003 | TV Aichi | 91 |
| Mermaid's Forest | October 4, 2003 | — | 11 |
| Merman in My Tub | October 6, 2014 | — | 13 |
| Merrie Melodies Starring Bugs Bunny & Friends | September 17, 1990 | Broadcast syndication | 65 |
| Meshimase Lodoss-tō Senki: Sorette Oishii no? | April 6, 2014 | — | 13 |
| Metal Armor Dragonar | February 7, 1987 | — | 48 |
| Metal Cardbot | — | Daekyo Kids TV | 26 |
| Metal Family | — | — | — |
| Metal Fighter Miku | July 8, 1994 | TV Tokyo | 13 |
| Metalheads | September 1, 2003 | — | 26 |
| Metalions | — | — | 104 |
| Metallic Rouge | January 11, 2024 | Fuji Television | 13 |
| Metalocalypse | August 6, 2006 | Adult Swim, Cartoon Network | 63 |
| MeteoHeroes | 2022 | Cartoonito | 104 |
| Mewkledreamy | April 5, 2020 | — | — |
| Mezzo DSA | January 4, 2004 | — | 13 |
| MF Ghost | October 2, 2023 | — | 37 |
| Miami Guns | February 5, 2000 | — | 13 |
| Miaunel and Balanel | 1974 | — | 60 |
| Mica | — | France 5 | — |
| Michel Strogoff | — | France 3 | 26 |
| Michiko & Hatchin | October 16, 2008 | — | 22 |
| Mickey and the Roadster Racers | — | — | — |
| Mickey Mouse | June 28, 2013 | Disney Channel | 96 |
| Mickey Mouse and Friends | 1994 | — | — |
| Mickey Mouse Clubhouse | May 5, 2006 | Playhouse Disney, Disney Channel, Disney Jr. | 125 |
| Mickey Mouse Clubhouse+ | July 21, 2025 | Disney Jr. | 20 |
| Mickey Mouse Funhouse | August 20, 2021 | Disney Jr. | 85 |
| Mickey Mouse Mixed-Up Adventures | January 15, 2017 | Disney Jr. | 87 |
| Mickey Mouse Works | May 1, 1999 | American Broadcasting Company | 25 |
| Mickey's Mouse Tracks | November 2, 1992 | — | — |
| Microid S | April 7, 1973 | — | 26 |
| Micronauts | — | — | 52 |
| Middle School Moguls | September 2, 2019 | Nickelodeon | — |
| Middlemost Post | July 9, 2021 | Nickelodeon | 33 |