| 2021-09-25 | UFC 266: Volkanovski vs. Ortega | Middleweight | Robbie Lawler def. Nick Diaz | TKO (retirement) | 3 | 0:44 |
| 2015-01-31 | UFC 183: Silva vs. Diaz | Middleweight | Anderson Silva vs. Nick Diaz | No Contest (overturned) | 5 | 5:00 |
| 2013-03-16 | UFC 158: St-Pierre vs. Diaz | Welterweight | Georges St-Pierre def. Nick Diaz title | Decision (unanimous) (50–45, 50–45, 50–45) | 5 | 5:00 |
| 2012-02-04 | UFC 143: Diaz vs. Condit | Welterweight | Carlos Condit def. Nick Diaz title | Decision (unanimous) (48–47, 49–46, 49–46) | 5 | 5:00 |
| 2011-10-29 | UFC 137: Penn vs. Diaz | Welterweight | Nick Diaz def. B.J. Penn | Decision (unanimous) (29–28, 29–27, 29–28) | 3 | 5:00 |
| 2006-11-18 | UFC 65: Bad Intentions | Welterweight | Nick Diaz def. Gleison Tibau | TKO (punches) | 2 | 2:27 |
| 2006-08-26 | UFC 62: Liddell vs. Sobral | Welterweight | Nick Diaz def. Josh Neer | Submission (kimura) | 3 | 1:42 |
| 2006-04-15 | UFC 59: Reality Check | Welterweight | Sean Sherk def. Nick Diaz | Decision (unanimous) (30–27, 30–27, 30–27) | 3 | 5:00 |
| 2006-02-04 | UFC 57: Liddell vs. Couture 3 | Welterweight | Joe Riggs def. Nick Diaz | Decision (unanimous) (29–28, 29–28, 30–27) | 3 | 5:00 |
| 2005-11-05 | The Ultimate Fighter: Team Hughes vs. Team Franklin Finale | Welterweight | Diego Sanchez def. Nick Diaz | Decision (unanimous) (30–27, 30–27, 30–27) | 3 | 5:00 |
| 2005-06-04 | UFC 53: Heavy Hitters | Welterweight | Nick Diaz def. Koji Oishi | KO (punches) | 1 | 1:24 |
| 2005-02-05 | UFC 51: Super Saturday | Welterweight | Nick Diaz def. Drew Fickett | TKO (punches) | 1 | 4:40 |
| 2004-08-21 | UFC 49: Unfinished Business | Welterweight | Karo Parisyan def. Nick Diaz | Decision (split) (29–28, 30–27, 28–29) | 3 | 5:00 |
| 2004-04-02 | UFC 47: It's On! | Welterweight | Nick Diaz def. Robbie Lawler | KO (punch) | 2 | 1:31 |
| 2003-09-26 | UFC 44: Undisputed | Welterweight | Nick Diaz def. Jeremy Jackson | Submission (armbar) | 3 | 2:04 |