| Monkart: Legend of Monster Kart | August 28, 2017 | — | 26 |
| Monster Buster Club | June 2, 2008 | Jetix, Gulli, YTV | 52 |
| Monster Farm | 1998 | — | — |
| Monster High | May 5, 2010 | YouTube | 182 |
| Monster High | October 6, 2022 | Nickelodeon | 33 |
| Monster Mania | September 11, 1995 | Broadcast syndication, CITV | 26 |
| Monster Math Squad | May 7, 2012 | CBC Kids | 50 |
| Monster Shaker | July 8, 2024 | Gulli, Clan | 51 |
| Monsters at Work | 2021 | Disney+ | 20 |
| Monsters vs. Aliens | March 23, 2013 | Nickelodeon | 26 |
| Monsuno | February 23, 2012 | Nicktoons | 65 |
| Moonzy | September 1, 2006 | Russia-1, Russia-K, Carousel, Mult | 572 |
| Moral Orel | December 13, 2005 | Adult Swim | 43 |
| Moriki-Doriki | 2018 | — | 26 |
| Mork & Mindy/Laverne & Shirley/Fonz Hour | September 25, 1982 | American Broadcasting Company | 27 |
| Mort and Phil | January 14, 1995 | Antena 3 | 26 |
| Mot | May 30, 1995 | Canal+, France 3 | 26 |
| Motorcity | April 30, 2012 | Disney XD | 20 |
| Mouk | September 19, 2011 | France 5 | 104 |
| Mr. Baby | May 3, 2009 | France 3 | 48 |
| Mr. Bean: The Animated Series | January 5, 2002 | ITV1 | 130 |
| Mr. Bogus | January 1, 1991 | Broadcast syndication | 58 |
| Mr. Freeman | March 6, 2010 | 2×2 | 17 |
| Mr. Pickles | September 21, 2014 | Adult Swim | 20 |
| My Big Big Friend | 2010 | Treehouse TV, Discovery Kids | 52 |
| My Friends Tigger & Pooh | May 12, 2007 | Playhouse Disney, Disney Channel, Disney Jr. | 44 |
| My Gym Partner's a Monkey | December 26, 2005 | Cartoon Network | 52 |
| My Life as a Teenage Robot | August 1, 2003 | Nickelodeon | 40 |
| My Little Pony | September 15, 1986 | Broadcast syndication | 65 |
| My Little Pony: Friendship Is Magic | October 10, 2010 | Discovery Family, Hub Network | 222 |
| My Two Cents | 2026 | Netflix | — |
| Nailoong VS Bombloong | — | Tencent Video | 26 |
| Napoleon Dynamite | January 15, 2012 | Fox Broadcasting Company | 6 |
| Nate Is Late | 2018 | Super RTL, Nine Network | 156 |
| Nature Cat | November 25, 2015 | PBS Kids | 91 |
| Naughty Nuts | — | EBS 1TV | 26 |
| Neighbors from Hell | June 7, 2010 | TBS | 10 |
| New Jungle Emperor, Go Ahead Leo! | October 5, 1966 | Fuji Television | — |
| New Looney Tunes | September 21, 2015 | Boomerang, Cartoon Network | 102 |
| NFL Rush Zone | September 6, 2010 | Nicktoons | 65 |
| Nightmare Ned | April 19, 1997 | American Broadcasting Company | 25 |
| Ninja Express | July 1, 2021 | — | — |
| Noodles and Nedd | — | — | — |
| Norman Normal | 2000 | Super RTL, France 3, TG4 | 52 |
| Numb Chucks | January 7, 2014 | YTV | 52 |
| Nutri Ventures | September 26, 2012 | RTP2 | 102 |
| Oddballs | October 7, 2022 | Netflix | 20 |
| Oddbods | 2013 | Disney Channel Asia | 260 |
| Oggy and the Cockroaches | November 28, 1998 | Gulli, France 3 | 501 |
| OK K.O.! Let's Be Heroes | August 1, 2017 | Cartoon Network | 112 |
| Olivia | January 24, 2009 | Nick Jr. | 37 |
| Once Upon a Time... Life | December 10, 1986 | Canal+ | 26 |
| Once Upon a Time... The Discoverers | January 3, 1994 | France 3 | 26 |
| Orange Moo-Cow | September 5, 2018 | — | 208 |
| Ori-Princess | — | CCTV-14 Children, Haha-Toonmax TV | — |
| Ormhildur the Brave | January 3, 2026 | RÚV | 26 |
| Orson and Olivia | February 8, 1994 | Canal+ | 26 |
| Oscar's Oasis | February 28, 2011 | Canal+ | 78 |
| Oscar, der Ballonfahrer | 2010 | — | 26 |
| Oswaldo | October 11, 2017 | Cartoon Network | 13 |