| Martin Morning | August 25, 2003 | France 3 | 104 |
| Martin Mystery | October 1, 2003 | Rai 2, YTV, M6 | 66 |
| Martine | August 27, 2012 | M6 | 52 |
| 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 |
| 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 County | July 1, 2021 | Netflix | 8 |
| Masha and the Bear | January 7, 2009 | Russia-1 | 200 |
| Masha's Spooky Stories | 2014 | — | — |
| Masha's Tales | January 1, 2012 | — | — |
| Mask Masters | April 20, 2013 | KBS 1TV | 52 |
| 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 | — |
| Mating Season | May 22, 2026 | — | — |
| 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 | — | — |
| 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 |
| 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 |
| Mały Pingwin Pik-Pok | — | TVP1 | — |
| Me & Mickey | — | — | — |
| Me and My Robot | — | France 3, EBS 1TV | 52 |
| Meatballs & Spaghetti | September 18, 1982 | CBS | 21 |
| 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 | — |
| MechaNick | October 5, 2003 | ITV | 32 |
| Meekah | 2022 | — | 66 |
| Mega Babies | October 10, 1999 | Fox Kids | 38 |
| Mega Man | September 11, 1994 | Broadcast syndication | 27 |
| Mega Man: Fully Charged | August 5, 2018 | Cartoon Network, WildBrainTV | 26 |
| Megas XLR | 2002 | Cartoon Network | 26 |
| Meine Freundin Conni | June 13, 2012 | KiKA | 52 |
| Melatie | May 20, 2025 | Yle Areena | 4 |
| Men in Black: The Series | October 11, 1997 | CBS, The WB | 53 |
| Meow Magic | April 14, 2021 | Carousel | 78 |
| Merlin the Magical Puppy | — | — | — |
| Merrie Melodies Starring Bugs Bunny & Friends | September 17, 1990 | Broadcast syndication | 65 |
| Metal Cardbot | — | Daekyo Kids TV | 26 |
| Metalheads | September 1, 2003 | — | 26 |
| Metalions | — | — | 104 |
| Metalocalypse | August 6, 2006 | Adult Swim, Cartoon Network | 63 |