| New Teen Titans | — | Cartoon Network | 19 |
| Neznaika on the Moon | — | — | 12 |
| NFL Rush Zone | September 6, 2010 | Nicktoons | 65 |
| Ni Hao, Kai-Lan | February 7, 2008 | Nickelodeon | 42 |
| Nick Knatterton | — | — | — |
| Nico | March 22, 2001 | RTVE | 26 |
| Nigel and Marmalade | — | — | — |
| Night Hood | June 15, 1996 | Canal+ | 26 |
| Nightmare Ned | April 19, 1997 | American Broadcasting Company | 25 |
| Niko and the Sword of Light | July 20, 2017 | — | 23 |
| Nine Songs of the Moving Heavens | March 10, 2016 | — | 60 |
| Ninja Express | July 1, 2021 | — | — |
| Ninjago | January 14, 2011 | Nickelodeon, Cartoon Network, Cartoon Network, YTV | 160 |
| Ninjago: Dragons Rising | June 1, 2023 | — | 40 |
| No Doubt in Us | — | — | — |
| Noah's Island | September 29, 1997 | BBC One | 39 |
| Noddy, Toyland Detective | March 26, 2016 | Super RTL, France 5, Universal Kids, Milkshake! | 52 |
| Nogalo | — | Croatian Radiotelevision | 39 |
| Noodles and Nedd | — | — | — |
| Norman Normal | 2000 | Super RTL, France 3, TG4 | 52 |
| Nouky and Friends | 2006 | RTL Club | 78 |
| Novators | September 13, 2010 | Carousel | 53 |
| Numb Chucks | January 7, 2014 | YTV | 52 |
| Numberblocks | January 23, 2017 | CBeebies | 90 |
| Nussa | November 20, 2018 | — | 73 |
| Nutri Ventures | September 26, 2012 | RTP2 | 102 |
| O (Sur)real Mundo de Any Malu | March 16, 2019 | Cartoon Network | 111 |
| O klukovi z plakátu | 1970 | — | — |
| O loupeznickém synku Cipískovi | 1972 | — | — |
| O loupežníku Rumcajsovi | 1967 | — | 52 |
| O zvířátkách pana Krbce | 1980 | — | 13 |
| Octonauts | September 16, 2010 | British Broadcasting Corporation, CBeebies | 133 |
| Octonauts: Above & Beyond | September 7, 2021 | Netflix | 13 |
| Odd Family | 2002 | TF1 | 26 |
| Odd Job Jack | March 5, 2003 | CTV Comedy Channel | 52 |
| Oddballs | October 7, 2022 | Netflix | 20 |
| Oddbods | 2013 | Disney Channel Asia | 260 |
| Oggy and the Cockroaches | November 28, 1998 | Gulli, France 3 | 501 |
| Oggy and the Cockroaches Next Generation | November 8, 2021 | Gulli | 13 |
| Oh Yeah! Cartoons | July 18, 1998 | Nickelodeon | 75 |
| Oh Yuck! | 2017 | — | — |
| Oishi High School Battle | — | — | 30 |
| OK K.O.! Let's Be Heroes | August 1, 2017 | Cartoon Network | 112 |
| Old Tom | 2002 | ABC Television | 52 |
| Olive the Ostrich | 2011 | Nick Jr. Channel | 104 |
| Olivia | January 24, 2009 | Nick Jr. | 37 |
| Ollie's Pack | April 6, 2020 | Nickelodeon | 27 |
| Olympics with Bolek and Lolek | — | Telewizja Polska | 13 |
| Olympus Guardian | December 11, 2002 | Seoul Broadcasting System | — |
| Omar & Hana | — | — | — |
| On The Edge | February 5, 2021 | — | — |
| Once Upon a Time... Life | December 10, 1986 | Canal+ | 26 |
| Once Upon a Time... Man | 1978 | France Régions 3 | 26 |
| Once Upon a Time... Planet Earth | December 22, 2008 | France 3 | 26 |
| Once Upon a Time... Space | October 2, 1982 | France Régions 3 | 26 |
| Once Upon a Time... The Americas | 1991 | Canal+, France 3 | 26 |
| Once Upon a Time... The Discoverers | January 3, 1994 | France 3 | 26 |
| Once Upon a Time... The Explorers | December 10, 1996 | France 3 | 26 |
| Once Upon a Time... The Objects | — | — | — |
| Oni: Thunder God's Tale | October 21, 2022 | — | 4 |