| Maggie and the Ferocious Beast | August 26, 2000 | Cartoon Network | 39 |
| Magi-Nation | September 8, 2007 | Rai 1, Rai 2, CBC Television, Rai Gulp, Boing | 52 |
| Magical Girl Friendship Squad | September 26, 2020 | Syfy | — |
| Make Way for Noddy | September 2, 2002 | PBS, PBS Kids | 100 |
| Malo Korrigan | — | M6 | 26 |
| Manu | March 3, 1990 | La Cinq | 104 |
| Mao Mao: Heroes of Pure Heart | July 1, 2019 | Cartoon Network | 40 |
| Marsupilami | September 18, 1993 | CBS | 29 |
| Martha Speaks | September 1, 2008 | PBS Kids, TVO Media Education Group | 96 |
| Martin Morning | August 25, 2003 | France 3 | 104 |
| Martin Mystery | October 1, 2003 | Rai 2, YTV, M6 | 66 |
| Martine | August 27, 2012 | M6 | 52 |
| 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 |
| Masameer County | July 1, 2021 | Netflix | 8 |
| Masha's Tales | January 1, 2012 | — | — |
| Masyanya | — | — | 157 |
| Mating Season | May 22, 2026 | — | — |
| 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 Steel | March 25, 2013 | Disney XD | 54 |
| Max Steel Turbo Missions | — | — | — |
| Maxipes Fik | 1975 | — | 3 |
| Mały Pingwin Pik-Pok | — | TVP1 | — |
| Meatballs & Spaghetti | September 18, 1982 | CBS | 21 |
| Meekah | 2022 | — | 66 |
| Mega Man | September 11, 1994 | Broadcast syndication | 27 |
| Megas XLR | 2002 | Cartoon Network | 26 |
| Men in Black: The Series | October 11, 1997 | CBS, The WB | 53 |
| Merrie Melodies Starring Bugs Bunny & Friends | September 17, 1990 | Broadcast syndication | 65 |
| Metalocalypse | August 6, 2006 | Adult Swim, Cartoon Network | 63 |
| Miaunel and Balanel | 1974 | — | 60 |
| Michel Strogoff | — | France 3 | 26 |
| Mickey Mouse | June 28, 2013 | Disney Channel | 96 |
| Mickey Mouse Clubhouse | May 5, 2006 | Playhouse Disney, Disney Channel, Disney Jr. | 125 |
| Mickey Mouse Clubhouse+ | July 21, 2025 | Disney Jr. | 20 |
| Mickey Mouse Works | May 1, 1999 | American Broadcasting Company | 25 |
| Middlemost Post | July 9, 2021 | Nickelodeon | 33 |
| Mighty Ducks | September 6, 1996 | American Broadcasting Company | 26 |
| Mike the Knight | September 8, 2011 | Treehouse TV | 128 |
| Mike Tyson Mysteries | October 27, 2014 | Adult Swim, Cartoon Network | 30 |
| Mike, Lu & Og | November 12, 1999 | Cartoon Network | 26 |
| Milo Murphy's Law | October 3, 2016 | Disney XD | 35 |
| Mini-Jon and Mini-Maple | — | Canadian Broadcasting Corporation, ICI Radio-Canada Télé | 104 |
| Minnie's Bow-Toons | November 14, 2011 | Disney Channel, Disney Jr. | 40 |
| Minuscule | October 18, 2006 | Disney Channel, France 2, MBC 2, JeemTV | 78 |
| Mio Mao | 1974 | Rai 1 | 78 |
| Miracles in Guslyar | 1988 | — | 6 |
| Miraculous: Tales of Ladybug & Cat Noir | September 1, 2015 | TF1, EBS 1TV | 183 |
| Mission: Magic! | September 8, 1973 | American Broadcasting Company | 16 |
| Mixels | February 12, 2014 | Cartoon Network | 31 |
| Moby Dick and the Secret of Mu | April 16, 2005 | TF1 | 26 |
| Mofli, the last koala | September 3, 1987 | Televisión Española | 13 |
| Moka's Fabulous Adventures! | January 4, 2020 | Gulli | 78 |
| Molang | January 2, 2016 | Disney Jr. | 306 |
| Molly of Denali | July 15, 2019 | PBS, PBS Kids | 67 |
| Momo | November 3, 2003 | — | 26 |
| Mongo Wrestling Alliance | January 23, 2011 | Adult Swim, Cartoon Network | 10 |
| Monk Little Dog | June 16, 2009 | Canal+ | 52 |