| Fighter | Record | Last Bout |
|---|---|---|
| Rodrigo Vera | 22-1-1 | 2026-05-30 |
| Rodrigo de Lima | 8-3-1 | 2015-02-14 |
| Roger Bowling | 12-6-0 (1 NC) | 2013-12-14 |
| Roger Gracie | 8-2-0 | 2013-07-06 |
| Roger Hollett | 13-5-0 | 2013-05-18 |
| Roger Huerta | 23-9-1 (1 NC) | 2009-09-16 |
| Roger Narvaez | 8-3-0 | 2015-03-14 |
| Roger Zapata | 4-2-0 | 2015-09-26 |
| Rogerio Bontorin | 16-4-0 (2 NC) | 2022-01-15 |
| Rogerio Nogueira | 23-10-0 | 2020-07-25 |
| Roland Delorme | 9-5-0 (1 NC) | 2014-08-23 |
| Roland Payne | 0-1-0 | 1994-09-09 |
| Rolando Bedoya | 14-5-0 | 2025-09-27 |
| Rolando Delgado | 11-6-1 | 2009-11-14 |
| Rolando Dy | 9-7-1 (1 NC) | 2018-06-23 |
| Roldan Sangcha'an | 4-2-0 | 2015-05-16 |
| Rolles Gracie | 8-4-0 | 2010-02-06 |
| Roman Bogatov | 10-1-0 | 2020-07-11 |
| Roman Dolidze | 15-6-0 | 2026-08-22 |
| Roman Kopylov | 15-5-0 | 2026-10-03 |
| Roman Mitichyan | 8-3-0 | 2008-04-02 |
| Roman Salazar | 10-6-0 (1 NC) | 2015-08-08 |
| Romie Aram | 7-1-0 | 2003-04-25 |
| Ron Faircloth | 33-20-0 (1 NC) | 2005-10-07 |
| Ron Stallings | 14-8-0 (1 NC) | 2015-09-05 |
| Ron Waterman | 16-6-2 | 2000-04-14 |
| Ron van Clief | 0-1-0 | 1994-12-16 |
| Ronald Jhun | 24-26-2 | 2004-08-21 |
| Ronaldo Rodriguez | 17-3-0 | 2025-03-29 |
| Ronda Rousey | 12-2-0 | 2016-12-30 |
| Rongzhu | 28-6-0 | 2026-09-12 |
| Ronnie Lawrence | 8-2-0 (1 NC) | 2023-06-17 |
| Ronny Markes | 17-5-0 | 2014-03-23 |
| Rony Jason | 14-7-0 (1 NC) | 2017-03-11 |
| Ronys Torres | 35-5-0 | 2010-03-31 |
| Roosevelt Roberts | 12-6-0 (1 NC) | 2024-09-28 |
| Roque Martinez | 15-8-2 | 2021-06-19 |
| Rory MacDonald | 19-4-0 | 2016-06-18 |
| Rory Markham | 17-6-0 | 2010-03-27 |
| Rory Singer | 11-9-0 | 2007-06-16 |
| Rose Namajunas | 15-8-0 | 2026-01-24 |
| Rosi Sexton | 13-5-0 | 2013-10-26 |
| Ross Pearson | 20-16-0 (1 NC) | 2019-03-30 |
| Ross Pointon | 6-17-0 | 2007-01-25 |
| Rostem Akman | 6-2-0 | 2019-10-05 |
| Rousimar Palhares | 19-8-0 | 2013-10-09 |
| Roxanne Modafferi | 25-21-0 | 2022-02-12 |
| Roy Nelson | 22-14-0 | 2017-04-15 |
| Royce Alger | 3-2-0 | 1999-07-16 |
| Royce Gracie | 15-2-3 | 2006-05-27 |