| Fighter | Record | Last Bout |
|---|---|---|
| Ray Rodriguez | 16-8-0 | 2021-03-13 |
| Ray Wizard | 0-1-0 | 1994-03-11 |
| Razak Al-Hassan | 13-5-0 | 2009-10-24 |
| Reese Andy | 7-3-0 | 2008-12-27 |
| Reginaldo Vieira | 13-5-0 | 2017-02-19 |
| Remco Pardoel | 9-6-1 (2 NC) | 1995-09-08 |
| Renan Barao | 34-9-0 (1 NC) | 2019-11-16 |
| Renato Sobral | 37-11-0 | 2007-08-25 |
| Renato Verissimo | 7-5-0 (1 NC) | 2004-10-22 |
| Renee Forte | 8-4-0 | 2014-03-15 |
| Renzo Gracie | 13-7-1 (1 NC) | 2010-04-10 |
| Reuben Duran | 11-7-1 | 2013-03-16 |
| Rex Holman | 4-2-0 | 2007-03-03 |
| Reza Madadi | 14-6-0 | 2017-05-28 |
| Reza Nasri | 0-1-0 | 1996-09-20 |
| Ricardo Abreu | 5-1-0 | 2015-06-06 |
| Ricardo Almeida | 13-5-0 | 2011-03-19 |
| Ricardo Funch | 9-6-0 | 2012-06-22 |
| Ricardo Lamas | 20-8-0 | 2020-08-29 |
| Ricardo Romero | 11-3-0 | 2011-09-24 |
| Ricco Rodriguez | 53-25-0 (1 NC) | 2003-11-21 |
| Rich Attonito | 10-5-0 | 2011-12-10 |
| Rich Clementi | 45-23-1 | 2009-02-07 |
| Rich Franklin | 29-7-0 (1 NC) | 2012-11-10 |
| Richard Crunkilton | 19-4-0 | 2003-04-25 |
| Richard Walsh | 9-5-0 | 2016-11-26 |
| Richardson Moreira | 7-4-0 | 2015-01-31 |
| Richie Hightower | 8-4-0 (1 NC) | 2007-12-08 |
| Richie Smullen | 3-1-1 | 2018-07-06 |
| Richie Vaculik | 10-4-0 | 2015-11-14 |
| Rick Davis | 3-1-1 | 2006-05-27 |
| Rick Story | 19-9-0 | 2016-08-20 |
| Ricky Glenn | 22-9-2 | 2024-08-17 |
| Ricky Rainey | 12-6-0 | 2018-11-30 |
| Riki Fukuda | 24-9-0 (1 NC) | 2013-03-02 |
| Rin Nakai | 19-2-1 | 2016-03-19 |
| Roan Carneiro | 21-11-0 | 2017-02-11 |
| Rob Broughton | 16-7-1 | 2011-11-05 |
| Rob Emerson | 18-12-0 (1 NC) | 2010-03-31 |
| Rob Kimmons | 25-9-0 | 2011-03-03 |
| Rob MacDonald | 5-4-0 | 2006-08-26 |
| Rob Wilkinson | 11-2-0 | 2018-02-10 |
| Rob Yundt | 9-5-0 | 2008-06-21 |
| Robbie Lawler | 30-16-0 (1 NC) | 2023-07-08 |
| Robert Drysdale | 7-0-0 (1 NC) | 2014-07-06 |
| Robert Lucarelli | 0-1-0 | 1994-03-11 |
| Robert McDaniel | 28-10-0 | 2014-03-15 |
| Robert Peralta | 18-8-0 (1 NC) | 2015-04-04 |
| Robert Sanchez | 8-2-0 | 2018-09-08 |
| Robert Whiteford | 14-4-0 | 2016-04-10 |