| Animentary: Ketsudan | April 3, 1971 | Nippon Television | 26 |
| Animerama | — | — | — |
| Anisava | — | — | — |
| Anmitsu Hime | October 5, 1986 | — | 51 |
| Anne Happy | April 7, 2016 | — | 12 |
| Anne of Green Gables | January 7, 1979 | Fuji Television | 50 |
| Anne Shirley | April 5, 2025 | NHK Educational TV | 24 |
| Anohana | April 14, 2011 | — | 11 |
| Anonymous Noise | April 11, 2017 | — | 12 |
| Another | January 10, 2012 | — | 12 |
| Anoyo no Subete wa, Obake-gumi! | April 7, 2020 | Chiba Television Broadcasting | 34 |
| Anti-Magic Academy: The 35th Test Platoon | October 7, 2015 | — | 12 |
| Antique Bakery | July 3, 2008 | Fuji Television | 12 |
| Anyamaru Tantei Kiruminzuu | October 5, 2009 | TV Tokyo | 50 |
| Anyway!Anpanman | October 3, 1988 | Nippon Television | — |
| Anyway, I'm Falling in Love with You | January 10, 2025 | — | 24 |
| Ao Haru Ride | July 7, 2014 | — | 12 |
| Ao Haru Ride | August 25, 2014 | — | 2 |
| Ao Oni: The Animation | October 3, 2016 | — | — |
| Ao-chan Can't Study! | April 5, 2019 | — | 12 |
| Aoashi | April 9, 2022 | NHK Educational TV | 24 |
| Aoharu × Machinegun | July 3, 2015 | TBS Television | 12 |
| Aoi Bungaku | October 11, 2009 | — | 12 |
| Aoi Umi no Tristia | — | — | 2 |
| Aokana: Four Rhythm Across the Blue | January 12, 2016 | TV Tokyo | 12 |
| Apache Yakyūgun | October 6, 1971 | — | — |
| Ape Escape | April 2002 | — | 76 |
| Apocalypse Bringer Mynoghra | July 6, 2025 | — | 13 |
| Apocalypse Hotel | April 9, 2025 | — | 12 |
| Apocalypse Zero | 1996 | — | — |
| Appare-Ranman! | April 2020 | — | — |
| Apparently, Disillusioned Adventurers Will Save the World | January 10, 2023 | — | 12 |
| April Showers Bring May Flowers | July 4, 2025 | — | 13 |
| Aqua Kids | — | — | — |
| Aquarian Age: Sign for Evolution | January 4, 2002 | — | 13 |
| Aquarion Evol | January 8, 2012 | — | 26 |
| Aquarion Logos | July 2, 2015 | — | 26 |
| Aquarion: Myth of Emotions | January 10, 2025 | — | 12 |
| Arabian Nights: Sinbad's Adventures | October 1, 1975 | Fuji Television | 52 |
| Araiguma Calcal-dan | April 4, 2025 | — | 12 |
| Arakawa Under the Bridge | April 4, 2010 | — | 26 |
| Arashi no Yoru ni: Himitsu no Tomodachi | April 4, 2012 | TV Tokyo | 26 |
| Arata: The Legend | April 8, 2013 | TV Tokyo | 12 |
| Arc the Lad | April 5, 1999 | WOWOW | 26 |
| Arcade Gamer Fubuki | February 25, 2002 | — | 4 |
| Arcadia of My Youth: Endless Orbit SSX | October 13, 1982 | TBS Television | — |
| Arcanadea | — | — | — |
| Are You a Landmine, Chihara-san? | January 7, 2027 | — | — |
| Are You Lost? | July 2, 2019 | — | 12 |
| Area 88 | February 5, 1985 | — | 3 |
| Area 88 | January 8, 2004 | — | 12 |
| Argento Soma | October 6, 2000 | TV Tokyo | 25 |
| Aria the Animation | October 5, 2005 | — | 13 |
| Aria the Avvenire | — | — | 3 |
| Aria the Natural | April 2, 2006 | — | 26 |
| Aria the Origination | January 8, 2008 | — | 13 |
| Aria the Scarlet Ammo | April 15, 2011 | — | 12 |
| Aria the Scarlet Ammo AA | October 6, 2015 | — | 12 |
| Ariel Deluxe | January 21, 1991 | — | 2 |
| Ariel Visual | July 21, 1989 | — | 2 |