| Ms. Vampire Who Lives in My Neighborhood | October 5, 2018 | AT-X | 12 |
| Muromi-san | April 7, 2013 | — | 13 |
| Musashi Gundoh | 2006 | — | 26 |
| Mutant Turtles: Superman Legend | — | — | — |
| My Deer Friend Nokotan | July 7, 2024 | — | 12 |
| My Neighbor Seki | January 5, 2014 | — | 21 |
| My One-Hit Kill Sister | April 8, 2023 | — | 12 |
| My-Otome | October 6, 2005 | — | 26 |
| My-Otome Zwei | November 24, 2006 | — | 4 |
| Nagi-Asu: A Lull in the Sea | October 3, 2013 | — | 26 |
| Naked Wolves | April 6, 2009 | — | 52 |
| Nanako SOS | April 2, 1983 | Fuji Television | 39 |
| Nanami-chan | May 17, 2004 | — | — |
| Nanana's Buried Treasure | April 10, 2014 | Fuji Television | 11 |
| Naruto | October 2002 | — | 220 |
| Negima! Magister Negi Magi | January 6, 2005 | TV Tokyo | 26 |
| Neko Jockey | May 6, 2021 | — | — |
| Neko Rahmen | December 24, 2006 | — | 13 |
| Nekopara | January 9, 2020 | — | 12 |
| Nerima Daikon Brothers | January 9, 2006 | TV Tokyo | 12 |
| Net Ghost PiPoPa | April 6, 2008 | — | 51 |
| New Dominion Tank Police | October 20, 1993 | — | 6 |
| New Game! | July 4, 2016 | — | 24 |
| NG Knight Lamune & 40 | April 6, 1990 | — | 38 |
| Nichijou | April 3, 2011 | — | 26 |
| Ninja Nonsense | July 8, 2004 | — | 12 |
| Nintama Rantarō | April 10, 1993 | NHK General TV | 2,321 |
| No Game No Life | April 9, 2014 | AT-X | 12 |
| No Longer Allowed in Another World | July 9, 2024 | — | 12 |
| Noa-senpai wa Tomodachi | — | — | — |
| Non Non Biyori | October 8, 2013 | TV Tokyo | 36 |
| Nono-chan | July 7, 2001 | TV Asahi | 61 |
| Noozles | July 7, 1984 | Fuji Television | 26 |
| Norakuro | October 5, 1970 | Fuji Television | 26 |
| Noramimi | January 9, 2008 | — | 24 |
| Nurse Witch Komugi | August 23, 2002 | — | 7 |
| Nurse Witch Komugi-chan R | January 10, 2016 | — | 12 |
| Nyanko Days | January 8, 2017 | — | 12 |
| Obake no Q-tarō | — | — | — |
| Oh My Goddess! | January 6, 2005 | TBS Television | — |
| Oh! Edo Rocket | April 3, 2007 | — | 26 |
| Ohayō! Spank | March 7, 1981 | — | 66 |
| Ojamajo Doremi | February 7, 1999 | — | 201 |
| Ojamanga Yamada-kun | September 28, 1980 | — | 101 |
| Ojarumaru | October 5, 1998 | NHK Educational TV | 1,868 |
| Okojo-san | October 2, 2001 | TV Tokyo | 51 |
| Omishi Magical Theater: Risky Safety | October 5, 1999 | WOWOW | 24 |
| One Piece | December 12, 1999 | Fuji Television | 1,169 |
| One Week Friends | April 6, 2014 | Tokyo MX, AT-X, Nippon BS Broadcasting, TV Aichi, MBS, ANIPLUS | 12 |
| Oneechan ga Kita | January 8, 2014 | — | 12 |
| Onegai My Melody | April 3, 2005 | — | — |
| Onimai | January 5, 2023 | — | 12 |
| Onsen Yōsei Hakone-chan | October 4, 2015 | — | 13 |
| Ooya-san wa Shishunki! | January 10, 2016 | — | 12 |
| Oreimo | February 22, 2011 | — | 4 |
| Oretachi Ijiwaru-kei | December 26, 2004 | — | 14 |
| Oruchuban Ebichu | August 1, 1999 | — | 12 |
| Osomatsu-kun | February 5, 1966 | — | 56 |
| Osomatsu-kun | February 13, 1988 | — | 86 |
| Otaku Elf | April 8, 2023 | — | 12 |