| Fighter | Record | Last Bout |
|---|---|---|
| Ross Pointon | 6-17-0 | 2007-01-25 |
| Rousimar Palhares | 19-8-0 | 2013-10-09 |
| Ruan Potts | 11-6-0 | 2015-02-28 |
| Ryan Parker | 0-1-0 | 1995-09-08 |
| Salahdine Parnasse | 24-2-0 | 2026-09-05 |
| Sam Patterson | 15-3-1 | 2026-07-25 |
| Santiago Ponzinibbio | 31-10-0 | 2026-07-25 |
| Sasha Palatnikov | 6-4-0 | 2021-08-21 |
| Sean Pierson | 14-6-0 | 2013-06-15 |
| Sergei Pavlovich | 21-3-0 | 2026-05-30 |
| Sergio Pettis | 18-5-0 | 2019-09-21 |
| Seth Petruzelli | 14-8-0 | 2010-11-13 |
| Shane Primm | 5-5-0 | 2008-12-13 |
| Sherman Pendergarst | 11-18-0 (1 NC) | 2006-11-18 |
| Soa Palelei | 22-5-0 | 2015-08-01 |
| Steven Peterson | 19-11-0 | 2023-03-25 |
| Tecia Pennington | 15-8-0 | 2025-11-08 |
| Teemu Packalen | 8-3-0 | 2019-09-07 |
| Thiago Perpetuo | 9-4-1 | 2014-03-23 |
| Thomas Petersen | 11-5-0 | 2026-07-25 |
| Tony Petarra | 2-3-1 | 1999-05-07 |
| Trevor Peek | 9-4-0 (1 NC) | 2026-09-05 |
| Trevor Prangley | 34-11-2 | 2006-04-06 |
| Tulio Palhares | 2-16-0 | 1998-10-16 |
| Tyson Pedro | 10-5-0 | 2024-03-02 |
| Viktor Pesta | 10-4-0 | 2017-01-15 |
| Vinc Pichel | 14-5-0 | 2025-03-29 |
| Vitor Petrino | 15-2-0 | 2026-08-22 |
| Viviane Pereira | 13-2-0 | 2018-06-23 |
| Wagner Prado | 12-3-0 (1 NC) | 2013-01-19 |
| Zac Pauga | 7-3-0 | 2024-02-10 |