| Fighter | Record | Last Bout |
|---|---|---|
| Paul Rodriguez | 10-9-2 | 2001-06-29 |
| Paul Sass | 14-2-0 | 2013-02-16 |
| Paul Taylor | 11-6-1 (1 NC) | 2011-02-05 |
| Paul Varelans | 9-9-0 | 1996-12-07 |
| Paulo Santos | 0-3-0 | 1998-10-16 |
| Paulo Thiago | 18-9-0 | 2014-09-13 |
| Pawel Pawlak | 12-3-0 | 2015-07-18 |
| Pearl Gonzalez | 6-3-0 | 2017-10-07 |
| Pedro Nobre | 18-4-2 (1 NC) | 2013-01-19 |
| Pedro Rizzo | 20-11-0 | 2003-11-21 |
| Peggy Morgan | 4-4-0 | 2013-11-30 |
| Per Eklund | 14-5-1 | 2009-02-21 |
| Pete Rodriguez | 5-2-0 | 2024-02-03 |
| Pete Sell | 10-7-0 | 2009-03-07 |
| Pete Spratt | 25-23-0 | 2007-06-12 |
| Pete Williams | 12-6-0 | 2002-03-22 |
| Peter Barrett | 11-5-0 | 2020-12-12 |
| Peter Sobotta | 17-7-1 | 2020-07-25 |
| Phil Baroni | 15-18-0 | 2011-01-01 |
| Phil Davis | 17-4-0 (1 NC) | 2015-01-24 |
| Phil Harris | 22-12-0 (2 NC) | 2014-07-19 |
| Phil Hawes | 12-6-0 | 2024-01-13 |
| Phil Johns | 30-14-1 | 2001-02-23 |
| Philip De Fries | 12-6-0 (1 NC) | 2013-04-06 |
| Philipe Lins | 18-5-0 | 2024-03-09 |
| Phillip Miller | 16-0-0 | 2002-11-22 |
| Phillipe Nover | 11-8-1 | 2017-02-11 |
| Pingyuan Liu | 13-7-0 | 2019-12-21 |
| Piotr Hallmann | 18-6-0 | 2015-11-07 |
| Poliana Botelho | 8-5-0 | 2022-06-04 |
| Ramona Pascual | 6-5-0 | 2022-11-05 |
| Raphael Pessoa | 10-2-0 | 2020-07-25 |
| Raulian Paiva | 21-5-0 | 2022-06-25 |
| Remco Pardoel | 9-6-1 (2 NC) | 1995-09-08 |
| Robert Peralta | 18-8-0 (1 NC) | 2015-04-04 |
| Rodolfo Rubio Perez | 10-16-1 | 2014-11-08 |
| Roland Payne | 0-1-0 | 1994-09-09 |
| Ross Pearson | 20-16-0 (1 NC) | 2019-03-30 |
| 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 |
| Sasha Palatnikov | 6-4-0 | 2021-08-21 |
| Sean Pierson | 14-6-0 | 2013-06-15 |
| 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 |