| Nick Pace (inactive) | | 1-2-0 | United States | Nov 19, 2011 |
| Angel Pacheco | | 0-2-0 | United States | Feb 28, 2026 |
| Larissa Pacheco (inactive) | | 0-2-0 | Brazil | Mar 14, 2015 |
| Teemu Packalen (inactive) | Pacu | 1-3-0 | Finland | Sep 7, 2019 |
| Chris Padilla | Taco | 5-0-1 | United States | Aug 22, 2026 |
| Fernando Padilla | El Valiente | 2-2-0 | Mexico | Dec 14, 2024 |
| Isabela de Padua (inactive) | Belinha | 0-1-0 | Brazil | Nov 16, 2019 |
| Damacio Page (inactive) | The Angel of Death | 0-3-0 | United States | Jul 11, 2012 |
| Michael Page | Venom | 5-1-0 | United Kingdom | Sep 5, 2026 |
| Dustin Pague (inactive) | The Disciple | 1-5-0 | United States | Oct 19, 2013 |
| Raulian Paiva (inactive) | | 3-4-0 | Brazil | Jun 25, 2022 |
| Fredson Paixao (inactive) | | 0-1-0 | Brazil | Dec 4, 2010 |
| Luis Pajuelo (inactive) | Corazon de Leon | 0-1-0 | Peru | Mar 23, 2024 |
| Bart Palaszewski (inactive) | Bartimus | 1-3-0 | Poland | Apr 13, 2013 |
| Sasha Palatnikov (inactive) | | 1-2-0 | Unknown | Aug 21, 2021 |
| Soa Palelei (inactive) | The Hulk | 4-3-0 | United States | Aug 1, 2015 |
| Rousimar Palhares (inactive) | Toquinho | 8-4-0 | Brazil | Oct 9, 2013 |
| Tulio Palhares (inactive) | | 1-0-0 | Unknown | Oct 16, 1998 |
| Alexandre Pantoja | The Cannibal | 14-5-0 | Brazil | Sep 19, 2026 |
| Jared Papazian (inactive) | The Jackhammer | 0-3-0 | United States | Dec 15, 2012 |
| Joe Pardo (inactive) | | 0-1-0 | Unknown | May 15, 1998 |
| Remco Pardoel (inactive) | Grizzly | 3-2-0 | United States | Sep 8, 1995 |
| Josh Parisian | | 2-5-0 | United States | Mar 9, 2024 |
| Karo Parisyan (inactive) | The Heat | 8-4-0 (1 NC) | Armenia | Nov 20, 2010 |
| HyunSung Park | Peace of Mind | 3-2-0 | South Korea | Oct 18, 2025 |
| JunYong Park | The Iron Turtle | 9-4-0 | South Korea | Oct 25, 2025 |
| Norman Parke (inactive) | Stormin' | 5-3-1 | Ireland | Feb 27, 2016 |
| Ryan Parker (inactive) | | 0-1-0 | Unknown | Sep 8, 1995 |
| Mick Parkin | | 4-2-0 | United Kingdom | Oct 3, 2026 |
| Salahdine Parnasse | Lion of Atlas | 1-0-0 | France | Sep 5, 2026 |
| Jonny Parsons | The Sluggernaut | 1-0-0 | United States | Jul 22, 2023 |
| Preston Parsons (inactive) | Pressure | 2-4-0 | United States | Jan 11, 2025 |
| Onassis Parungao (inactive) | | 1-0-0 | Unknown | Sep 8, 1995 |
| Ramona Pascual (inactive) | | 0-3-0 | United States | Nov 5, 2022 |
| Guilherme Pat | Kong | 1-2-0 | Brazil | Aug 8, 2026 |
| Jorge Patino (inactive) | Macaco | 0-1-0 | United States | Jan 8, 1999 |
| Alan Patrick (inactive) | Nuguette | 5-4-0 (1 NC) | Brazil | May 14, 2022 |
| Claude Patrick (inactive) | The Prince | 3-1-0 | Canada | Dec 10, 2011 |
| Michael Patt (inactive) | | 0-2-0 | United States | Mar 7, 2009 |
| Sam Patterson | | 5-2-0 | United Kingdom | Jul 25, 2026 |
| Zac Pauga (inactive) | The High Chief | 1-3-0 | United States | Feb 10, 2024 |
| Gloria de Paula (inactive) | Glorinha | 1-3-0 | Brazil | Jun 18, 2022 |
| Julio Paulino (inactive) | The Dominican Demon | 0-2-0 | United States | Sep 25, 2010 |
| Sergei Pavlovich | | 9-3-0 | Russia | May 30, 2026 |
| Pawel Pawlak (inactive) | | 1-2-0 | United States | Jul 18, 2015 |
| Estevan Payan (inactive) | El Terrible | 0-3-0 | Unknown | Apr 19, 2014 |
| Roland Payne (inactive) | | 0-1-0 | United States | Sep 9, 1994 |
| Jonathan Pearce (inactive) | JSP | 5-4-0 | United States | Oct 12, 2024 |
| Ross Pearson (inactive) | The Real Deal | 12-13-0 (1 NC) | United Kingdom | Mar 30, 2019 |
| Andre Pederneiras (inactive) | | 0-1-0 | Brazil | Jul 16, 1999 |
| Tyson Pedro (inactive) | | 6-5-0 | Australia | Mar 2, 2024 |
| Trevor Peek | | 2-4-0 | United States | Sep 5, 2026 |
| Filip Pejic (inactive) | | 0-1-0 | Croatia | Apr 10, 2016 |
| Kurt Pellegrino (inactive) | Batman | 7-5-0 | United States | Mar 19, 2011 |
| Julianna Pena | The Venezuelan Vixen | 8-4-0 | United States | Jun 7, 2025 |
| Luis Pena (inactive) | Violent Bob Ross | 5-3-0 | Italy | Apr 17, 2021 |
| Sherman Pendergarst (inactive) | The Tank | 0-1-0 | United States | Nov 18, 2006 |
| Cathal Pendred (inactive) | The Punisher | 4-2-0 | United States | Oct 24, 2015 |
| BJ Penn (inactive) | The Prodigy | 12-13-2 | United States | May 11, 2019 |
| Jessica Penne (inactive) | | 3-6-0 | United States | Oct 19, 2024 |
| Nick Penner (inactive) | The Quiet Assassin | 0-2-0 | Canada | Dec 14, 2012 |
| Raquel Pennington | Rocky | 13-6-0 | United States | Oct 5, 2024 |
| Tecia Pennington (inactive) | Tiny Tornado | 11-8-0 | United States | Nov 8, 2025 |
| Godofredo Pepey (inactive) | | 5-6-0 | Unknown | Jan 27, 2018 |
| Robert Peralta (inactive) | Problems | 4-3-0 (1 NC) | United States | Apr 4, 2015 |
| Alex Pereira | Poatan | 10-3-0 | Brazil | Jun 14, 2026 |
| Alice Pereira | Golden Girl | 1-1-0 | Brazil | Apr 4, 2026 |
| Michel Pereira (inactive) | Demolidor | 10-6-0 | Brazil | Jun 27, 2026 |
| Viviane Pereira (inactive) | Sucuri | 2-2-0 | Brazil | Jun 23, 2018 |
| Ailin Perez | Fiona | 7-1-0 | Argentina | Sep 26, 2026 |
| Alejandro Perez (inactive) | Turbo | 8-4-1 | Mexico | Feb 26, 2022 |
| Alex Perez | | 8-7-0 (1 NC) | United States | Aug 29, 2026 |
| Erik Perez (inactive) | Goyito | 7-2-0 | Mexico | Nov 5, 2016 |
| Frankie Perez (inactive) | | 1-3-0 | United States | Jul 22, 2017 |
| Markus Perez (inactive) | Maluko | 2-5-0 | Brazil | Jan 20, 2021 |
| Rodolfo Rubio Perez (inactive) | Fito | 0-1-0 | Unknown | Nov 8, 2014 |
| Brando Pericic | The Balkan Bear | 3-0-0 | Australia | May 2, 2026 |
| Anthony Perosh (inactive) | The Hippo | 5-7-0 | Australia | Nov 14, 2015 |
| Hernani Perpetuo (inactive) | | 0-2-0 | Brazil | Jul 26, 2014 |
| Thiago Perpetuo (inactive) | Bodao | 1-2-0 | Brazil | Mar 23, 2014 |
| Jay Perrin (inactive) | The Joker | 0-3-0 | United States | Dec 10, 2022 |
| Mike Perry (inactive) | Platinum | 7-8-0 | United States | Apr 10, 2021 |
| Raphael Pessoa (inactive) | Bebezao | 1-2-0 | Unknown | Jul 25, 2020 |
| Viktor Pesta (inactive) | | 1-4-0 | Unknown | Jan 15, 2017 |
| Tony Petarra (inactive) | | 0-1-0 | Unknown | May 7, 1999 |
| Thomas Petersen | The Train | 3-4-0 | United States | Jul 25, 2026 |
| Steven Peterson (inactive) | Ocho | 3-5-0 | United States | Mar 25, 2023 |
| Vitor Petrino | | 8-2-0 | Brazil | Aug 22, 2026 |
| Andre Petroski | | 8-5-0 | United States | May 16, 2026 |
| Armen Petrosyan (inactive) | Superman | 3-4-0 | Russia | Mar 8, 2025 |
| Ivana Petrovic (inactive) | | 1-3-0 | Germany | May 3, 2025 |
| Seth Petruzelli (inactive) | The Silverback | 0-4-0 | United States | Nov 13, 2010 |
| Anthony Pettis (inactive) | Showtime | 11-9-0 | United States | Dec 19, 2020 |
| Sergio Pettis (inactive) | | 9-5-0 | United States | Sep 21, 2019 |
| Forrest Petz (inactive) | The Meat Cleaver | 2-5-0 | United States | Sep 15, 2010 |
| Cody Pfister (inactive) | The Fist | 1-3-0 | United States | Jul 13, 2016 |
| Nam Phan (inactive) | | 2-6-0 | United States | Mar 1, 2014 |
| Constantinos Philippou (inactive) | | 6-4-0 | United States | May 16, 2015 |
| Aaron Phillips (inactive) | The Dragon | 0-4-0 | United States | Apr 15, 2023 |
| Elizabeth Phillips (inactive) | | 1-3-0 | United States | Aug 20, 2016 |
| John Phillips (inactive) | The Welsh Wrecking Machine | 1-5-0 | United Kingdom | Oct 17, 2020 |
| Kyler Phillips | The Matrix | 6-4-0 | United States | Apr 18, 2026 |
| Vinc Pichel (inactive) | From Hell | 7-5-0 | United States | Mar 29, 2025 |
| Brad Pickett (inactive) | One Punch | 5-9-0 | United Kingdom | Mar 18, 2017 |
| Jamie Pickett (inactive) | The Night Wolf | 2-7-0 | United States | Mar 2, 2024 |
| Aaron Pico | | 1-1-0 | United States | Apr 11, 2026 |
| Oskar Piechota (inactive) | Imadlo | 2-3-0 (1 NC) | Poland | Jun 20, 2020 |
| Mike Pierce (inactive) | | 9-5-0 | United States | Dec 11, 2015 |
| Joao Pierini (inactive) | | 0-1-0 | United States | Jun 22, 2002 |
| Sean Pierson (inactive) | The Punisher | 4-2-0 | Canada | Jun 15, 2013 |
| Domingo Pilarte (inactive) | Son of Fire | 0-2-0 (1 NC) | United States | Aug 21, 2021 |
| Paddy Pimblett | The Baddy | 8-1-0 | United Kingdom | Jul 11, 2026 |
| Damian Pinas | The Baba Yaga | 3-0-0 | Suriname | Oct 3, 2026 |
| Daniel Pineda (inactive) | The Pit | 5-8-0 (1 NC) | United States | Oct 19, 2024 |
| Jesus Pinedo (inactive) | El Mudo | 1-1-0 | Peru | Mar 23, 2019 |
| Luana Pinheiro | | 3-4-0 | Brazil | May 17, 2025 |
| Mario Pinto | | 4-0-0 | Portugal | Sep 5, 2026 |
| Gaetano Pirrello (inactive) | El Tigre | 0-2-0 | Belgium | Oct 2, 2021 |
| Patricio Pitbull | | 2-2-0 | Unknown | Sep 19, 2026 |
| Maki Pitolo (inactive) | Coconut Bombz | 1-5-0 | United States | Dec 4, 2021 |
| Dricus Du Plessis | Stillknocks | 10-1-0 | South Africa | Jul 18, 2026 |
| Jamal Pogues (inactive) | | 2-2-0 | United States | Feb 1, 2025 |
| Ross Pointon (inactive) | The Gladiator | 0-2-0 | United Kingdom | Jan 25, 2007 |
| Dustin Poirier | The Diamond | 22-9-0 (1 NC) | United States | Jul 19, 2025 |
| Igor Pokrajac (inactive) | The Duke | 4-8-0 (1 NC) | Croatia | Apr 10, 2016 |
| John Polakowski (inactive) | Buckets of Blood | 0-1-0 | United States | Dec 13, 2008 |
| Julia Polastri | Psycho | 3-3-0 | Brazil | Aug 29, 2026 |
| Santiago Ponzinibbio | Argentine Dagger | 12-9-0 | Argentina | Jul 25, 2026 |
| Grigory Popov (inactive) | | 0-2-0 | Russia | Nov 9, 2019 |
| Alexander Poppeck | Ironside | 0-1-0 | Unknown | Aug 1, 2026 |
| Parker Porter | | 4-4-0 | United States | Aug 26, 2023 |
| Ihor Potieria (inactive) | Duelist | 2-6-0 | Ukraine | Jan 11, 2025 |
| Callan Potter (inactive) | The Rockstar | 1-2-0 | Australia | Feb 22, 2020 |
| Ruan Potts (inactive) | Fangzz | 0-3-0 | South Africa | Feb 28, 2015 |
| Devin Powell (inactive) | | 1-3-0 | United States | Nov 17, 2018 |
| Marcin Prachnio (inactive) | | 4-7-0 | Poland | Jul 19, 2025 |
| Francisco Prado | | 1-5-0 | Argentina | Apr 11, 2026 |
| Wagner Prado (inactive) | Caldeirao | 0-2-0 (1 NC) | Unknown | Jan 19, 2013 |
| Trevor Prangley (inactive) | | 2-2-0 | South Africa | Apr 6, 2006 |
| Carlo Prater (inactive) | Neo | 1-2-0 | Brazil | Oct 5, 2012 |
| Carlos Prates | The Nightmare | 7-1-0 | Brazil | May 2, 2026 |
| Michel Prazeres (inactive) | Tractor | 10-4-0 | Brazil | Jun 26, 2021 |
| Kyle Prepolec | Killshot | 0-5-0 | Canada | Aug 1, 2026 |
| Ovince Saint Preux (inactive) | | 15-13-0 | United States | Oct 5, 2024 |
| Chris Price (inactive) | The Exorcist | 0-2-0 | United States | Jan 25, 2007 |
| Dorian Price (inactive) | | 0-1-0 | United States | Dec 8, 2007 |
| Niko Price | The Hybrid | 8-11-0 (2 NC) | United States | Mar 28, 2026 |
| Shane Primm (inactive) | | 0-1-0 | United States | Dec 13, 2008 |
| Jiri Prochazka | | 6-3-0 | Czechia | Apr 11, 2026 |
| Lara Procopio (inactive) | | 1-2-0 | Brazil | Jun 19, 2021 |
| Joe Proctor (inactive) | | 4-4-0 | United States | Apr 22, 2017 |
| Lucie Pudilova | | 3-8-0 | Czechia | Jul 20, 2024 |
| Claudio Puelles | Prince of Peru | 5-4-0 | Peru | Sep 13, 2025 |
| Juan Manuel Puig (inactive) | Fenix | 0-2-0 | Mexico | Nov 22, 2014 |
| Jens Pulver (inactive) | Little Evil | 6-2-1 | United States | Jun 23, 2007 |
| Andrey Pulyaev | | 1-4-0 | Russia | Oct 3, 2026 |
| CM Punk (inactive) | | 0-1-0 (1 NC) | United States | Jun 9, 2018 |
| Joe Pyfer | Bodybagz | 7-1-0 | United States | Mar 28, 2026 |
| Mike Pyle (inactive) | Quicksand | 10-9-0 | United States | Mar 3, 2018 |