| Mashle | April 8, 2023 | — | 24 |
| Mask Masters | April 20, 2013 | KBS 1TV | 52 |
| Massugu ni Ikō: Go Forward. | August 18, 2003 | — | 9 |
| Master Keaton | October 6, 1998 | Nippon Television | 24 |
| Master of Epic: The Animation Age | 2007 | — | — |
| Master of Martial Hearts | October 29, 2008 | — | 5 |
| Master Raindrop | 2008 | Seven Network | 26 |
| Masters of the Universe: Revelation | July 23, 2021 | Netflix | 15 |
| Masters of the Universe: Revolution | January 25, 2024 | Netflix | — |
| Masters of the Universe: Tales from Eternia | — | YouTube | — |
| Masyanya | — | — | 157 |
| Matchless Raijin-Oh | April 3, 1991 | TV Tokyo | 51 |
| Mating Season | May 22, 2026 | — | — |
| Matoi the Sacred Slayer | October 4, 2016 | — | 12 |
| Matsurika Kanriden | January 2027 | — | — |
| Matt Hatter Chronicles | October 31, 2011 | CITV | 52 |
| Matt's Monsters | December 20, 2008 | Rai 2, M6, Canal+ Family | 52 |
| Matty's Funday Funnies | October 11, 1959 | — | — |
| Mau Makan Apa? | — | — | 9 |
| Max & Ruby | May 3, 2002 | Treehouse TV | 130 |
| Max & the Midknights | October 30, 2024 | Nickelodeon | 10 |
| Max Steel | February 26, 2000 | Cartoon Network, The WB | 36 |
| Max Steel | March 25, 2013 | Disney XD | 54 |
| Max Steel Turbo Missions | — | — | — |
| MaXi | November 4, 2017 | TFO | 26 |
| Maxi Cat | 1971 | — | 24 |
| Maxie's World | September 14, 1987 | Broadcast syndication | 32 |
| Maxipes Fik | 1975 | — | 3 |
| May I Ask for One Final Thing? | October 4, 2025 | — | 13 |
| Maya & Miguel | October 11, 2004 | PBS, PBS Kids Go! | 65 |
| Maya and the Three | October 22, 2021 | Netflix | 9 |
| Maya the Bee | September 5, 2012 | ZDF, Universal Kids, NBC Kids, Sprout | 130 |
| Maya the Honey Bee | April 1, 1975 | TV Asahi | 104 |
| Mayo Chiki! | July 7, 2011 | TBS Television | 13 |
| Mayoi Neko Overrun! | April 6, 2010 | — | 13 |
| Mayonaka Punch | July 8, 2024 | — | 12 |
| Maze | July 24, 1996 | — | 2 |
| Maze | April 2, 1997 | — | 25 |
| Mazinger Edition Z: The Impact! | April 4, 2009 | — | — |
| Mazinger Z | December 3, 1972 | Fuji Television | 92 |
| Mały Pingwin Pik-Pok | — | TVP1 | — |
| Me & Mickey | — | — | — |
| Me & Roboco | December 4, 2022 | TX Network | 28 |
| Me and My Robot | — | France 3, EBS 1TV | 52 |
| Me and the Alien MuMu | April 10, 2025 | — | 24 |
| Meatballs & Spaghetti | September 18, 1982 | CBS | 21 |
| Mebius Dust | July 9, 2026 | — | 12 |
| Mecard Ball | — | MBC TV | 26 |
| Mech Cadets | August 10, 2023 | Netflix | 10 |
| Mecha Builders | — | Cartoon Network, HBO Max | — |
| Mechamato | — | Cartoon Network, SIC K, Astro Prima, HBO Go | — |
| Mechander Robo | March 3, 1977 | — | 35 |
| Mechanical Arms | October 4, 2024 | — | 12 |
| Mechanical Marie | October 5, 2025 | — | 12 |
| MechaNick | October 5, 2003 | ITV | 32 |
| Medabots | July 2, 1999 | — | 52 |
| Medaka Box | April 5, 2012 | — | 12 |
| Medaka Kuroiwa Is Impervious to My Charms | January 7, 2025 | TX Network | 12 |
| Medalist | January 5, 2025 | — | 22 |
| Meekah | 2022 | — | 66 |