| Paradox Live: The Animation | October 3, 2023 | — | — |
| Parallel World Pharmacy | July 10, 2022 | — | 12 |
| Paranoia Agent | February 2, 2004 | WOWOW | 13 |
| PaRappa the Rapper | April 14, 2001 | Fuji Television | 30 |
| Parasol Henbē | October 2, 1989 | NHK General TV | 200 |
| Parasyte: The Maxim | October 9, 2014 | — | 24 |
| Pardon the Intrusion, I'm Home! | April 8, 2026 | — | 12 |
| Pass the Monster Meat, Milady! | October 3, 2025 | — | 12 |
| Pastel Memories | January 8, 2019 | — | 12 |
| Pastel Yumi, the Magic Idol | March 7, 1986 | — | 25 |
| Patalliro Saiyūki! | June 5, 2005 | — | 27 |
| Patalliro! | April 8, 1982 | — | 49 |
| Patlabor: The TV Series | October 11, 1989 | — | 47 |
| Patta Potta Monta | August 1, 2006 | Chiba Television Broadcasting | — |
| Paul's Miraculous Adventure | October 3, 1976 | Fuji Television | 50 |
| Peacemaker Kurogane | October 7, 2003 | — | 24 |
| Peach Boy Riverside | July 1, 2021 | — | 12 |
| Peach Girl | January 8, 2005 | TV Tokyo | 25 |
| Penguindrum | July 8, 2011 | — | 24 |
| Perman | April 2, 1967 | — | 54 |
| Perman | April 4, 1983 | — | 526 |
| Peropero Sparkles | — | — | — |
| Persia, the Magic Fairy | July 6, 1984 | — | 48 |
| Persona 4: The Animation | October 7, 2011 | — | 26 |
| Persona 4: The Golden Animation | July 10, 2014 | — | 12 |
| Persona 5: The Animation | April 8, 2018 | — | 26 |
| Persona: Trinity Soul | January 5, 2008 | — | 26 |
| Personal Computer Travel Tanteidan | October 1, 1981 | — | — |
| Pet | January 6, 2020 | — | 13 |
| Pet Shop of Horrors | March 2, 1999 | — | 4 |
| Petals of Reincarnation | April 3, 2026 | — | 13 |
| Peter Grill and the Philosopher's Time | July 11, 2020 | — | 24 |
| Petite Princess Yucie | September 30, 2002 | NHK Satellite 2 Television | 26 |
| Petopeto-san | July 9, 2005 | — | 13 |
| Phantasy Star Online 2 the Animation | January 8, 2016 | — | — |
| Phantasy Star Online 2: Episode Oracle | October 7, 2019 | — | 25 |
| Phantom Busters | 2027 | — | — |
| Phantom in the Twilight | July 10, 2018 | — | 12 |
| Phantom of the Idol | July 1, 2022 | — | 10 |
| Phantom Thief Jeanne | February 13, 1999 | TV Asahi | 44 |
| Phantom: Requiem for the Phantom | April 2, 2009 | — | — |
| Phanton Thief Reinya | January 9, 2010 | — | 12 |
| Phi Brain: Puzzle of God | October 2, 2011 | NHK Educational TV | 75 |
| Phoenix | April 4, 2004 | NHK General TV | 13 |
| Photo Kano | April 5, 2013 | — | 13 |
| Pi Po Pa Po Patrol-kun | December 4, 2000 | — | 65 |
| Piano: The Melody of a Young Girl's Heart | November 11, 2002 | Kids Station | 10 |
| Piccolino no Bōken | April 27, 1976 | TV Asahi | 52 |
| Pikaia! | April 29, 2015 | NHK Educational TV | 13 |
| Pikotaro's Lullaby La La By | August 2, 2017 | — | — |
| Pinch to Punch | September 29, 1969 | Fuji Television | 156 |
| Ping Pong the Animation | April 11, 2014 | Fuji Television | — |
| Pingu in the City | October 7, 2017 | NHK Educational TV | 26 |
| Pink Lady Monogatari: Eikō no Tenshitachi | October 24, 1978 | TV Tokyo | 35 |
| Pino & Shinoby | February 10, 2026 | Rai Yoyo, Yomiuri Telecasting Corporation | 26 |
| Pinocchio: The Series | January 4, 1972 | — | 52 |
| Pita-Ten | April 7, 2002 | TV Tokyo | 26 |
| Place to Place | April 5, 2012 | TBS Television | 12 |
| Planet With | July 8, 2018 | — | 12 |
| Planetes | October 4, 2003 | NHK Satellite 2 Television | 26 |