| Reborn to Master the Blade: From Hero-King to Extraordinary Squire | January 10, 2023 | — | 12 |
| Reborn to Master the Blade: From Hero-King to Extraordinary Squire | November 7, 2020 | — | 2 |
| Reborn! | October 7, 2006 | TV Tokyo | 203 |
| Rebuild of Evangelion | — | — | — |
| Rebuild World | — | — | — |
| Rec | February 3, 2006 | — | 9 |
| Recently, My Sister Is Unusual | January 4, 2014 | — | 12 |
| Recess | September 13, 1997 | American Broadcasting Company | 129 |
| Recommendations from Iwamoto-senpai | July 4, 2026 | — | 12 |
| Record of Grancrest War | January 6, 2018 | — | 24 |
| Record of Lodoss War | June 30, 1990 | — | 13 |
| Record of Lodoss War: Chronicles of the Heroic Knight | April 1, 1998 | TV Tokyo | 27 |
| Record of Ragnarok | June 17, 2021 | — | — |
| Recorded by Arizal | July 13, 2020 | — | 4 |
| Recorder and Randsell | January 6, 2012 | — | 13 |
| Recovery of an MMO Junkie | October 6, 2017 | — | 10 |
| Red Baron | April 5, 1994 | Nippon Television | 49 |
| Red Bicycle | — | KBS 1TV | — |
| Red Cat Ramen | July 4, 2024 | — | 12 |
| Red Data Girl | March 16, 2013 | — | 12 |
| Red Fox | May 19, 2025 | Laftel | 10 |
| Red Garden | October 3, 2006 | — | 22 |
| Red Riding Hood: A Detective Story | 2027 | — | — |
| Red River | July 8, 2026 | — | — |
| Redakai: Conquer the Kairu | July 9, 2011 | Canal J | 52 |
| Redo of Healer | January 13, 2021 | — | 12 |
| Redwall | April 12, 1999 | France 3 | 39 |
| Regal Academy | May 22, 2016 | Rai Gulp | 26 |
| Regalia: The Three Sacred Stars | July 7, 2016 | — | — |
| Reggae Rabbits | — | — | — |
| Regular Show | September 6, 2010 | Cartoon Network | 261 |
| Regular Show: The Lost Tapes | May 11, 2026 | Cartoon Network | — |
| Reideen | March 3, 2007 | — | — |
| Reideen the Brave | April 4, 1975 | TV Asahi | 50 |
| Reign of the Seven Spellblades | July 8, 2023 | — | 15 |
| Reign: The Conqueror | September 14, 1999 | — | — |
| Reincarnated as a Dragon Hatchling | January 10, 2026 | — | — |
| Reincarnated as a Neglected Noble | July 6, 2025 | — | 12 |
| Reincarnated as a Sword | October 5, 2022 | — | 12 |
| Reincarnated as the Daughter of the Legendary Hero and the Queen of Spirits | October 5, 2025 | — | 12 |
| Reincarnated in a Mafia Dating Sim | — | — | — |
| Reincarnation in the Game World Dan-Katsu | January 2027 | — | — |
| Reiwa no Di Gi Charat | October 7, 2022 | — | 16 |
| Rekkit Rabbit | March 16, 2011 | TF1 | 104 |
| Reksio | 1967 | Telewizja Polska | 65 |
| Release the Spyce | October 7, 2018 | — | 12 |
| ReLIFE | July 2, 2016 | — | 13 |
| Remake Our Life! | July 3, 2021 | — | 12 |
| Remi | October 7, 1979 | AVRO | 50 |
| Remi, Nobody's Girl | September 1, 1996 | Fuji Television | 26 |
| Remy & Boo | May 1, 2020 | Universal Kids | — |
| Ren & Stimpy | July 1, 2024 | Comedy Central | 10 |
| Ren & Stimpy "Adult Party Cartoon" | June 26, 2003 | Spike TV | 6 |
| Renada | October 5, 1998 | — | 72 |
| Renai Flops | October 12, 2022 | — | 12 |
| Renegade Immortal (Donghua) | — | — | — |
| Renkin 3-kyū Magical? Pokān | April 4, 2006 | — | 12 |
| Rent-A-Girlfriend | July 11, 2020 | — | 60 |
| Rental Magica | October 7, 2007 | — | 24 |
| Reporter Blues | 1991 | RAI | 52 |