| 2012-07-07 | UFC 148: Silva vs. Sonnen II | Light Heavyweight | Forrest Griffin def. Tito Ortiz | Decision (unanimous) (29–28, 29–28, 29–28) | 3 | 5:00 |
| 2011-12-10 | UFC 140: Jones vs. Machida | Light Heavyweight | Antônio Rogério Nogueira def. Tito Ortiz | TKO (punches and elbows to the body) | 1 | 3:15 |
| 2011-08-06 | UFC 133: Evans vs. Ortiz | Light Heavyweight | Rashad Evans def. Tito Ortiz | TKO (knee to the body and punches) | 2 | 4:48 |
| 2011-07-02 | UFC 132: Cruz vs. Faber | Light Heavyweight | Tito Ortiz def. Ryan Bader | Submission (guillotine choke) | 1 | 1:56 |
| 2010-10-23 | UFC 121: Lesnar vs. Velasquez | Light Heavyweight | Matt Hamill def. Tito Ortiz | Decision (unanimous) (29–28, 29–28, 30–27) | 3 | 5:00 |
| 2009-11-21 | UFC 106: Ortiz vs. Griffin 2 | Light Heavyweight | Forrest Griffin def. Tito Ortiz | Decision (split) (28–29, 30–27, 29–28) | 3 | 5:00 |
| 2008-05-24 | UFC 84: Ill Will | Light Heavyweight | Lyoto Machida def. Tito Ortiz | Decision (unanimous) (30–27, 30–27, 30–27) | 3 | 5:00 |
| 2007-07-07 | UFC 73: Stacked | Light Heavyweight | Tito Ortiz vs. Rashad Evans | Draw (unanimous) (28–28, 28–28, 28–28) | 3 | 5:00 |
| 2006-12-30 | UFC 66: Liddell vs. Ortiz | Light Heavyweight | Chuck Liddell def. Tito Ortiz title | TKO (punches) | 3 | 3:59 |
| 2006-10-10 | UFC Fight Night 6.5 | Light Heavyweight | Tito Ortiz def. Ken Shamrock | TKO (punches) | 1 | 2:23 |
| 2006-07-08 | UFC 61: Bitter Rivals | Light Heavyweight | Tito Ortiz def. Ken Shamrock | TKO (elbows) | 1 | 1:18 |
| 2006-04-15 | UFC 59: Reality Check | Light Heavyweight | Tito Ortiz def. Forrest Griffin | Decision (split) (30–27, 28–29, 29–27) | 3 | 5:00 |
| 2005-02-05 | UFC 51: Super Saturday | Light Heavyweight | Tito Ortiz def. Vitor Belfort | Decision (split) (29–28, 28–29, 29–28) | 3 | 5:00 |
| 2004-10-22 | UFC 50: The War of '04 | Light Heavyweight | Tito Ortiz def. Patrick Côté | Decision (unanimous) (30–27, 30–26, 30–26) | 3 | 5:00 |
| 2004-04-02 | UFC 47: It's On! | Light Heavyweight | Chuck Liddell def. Tito Ortiz | KO (punches) | 2 | 0:38 |
| 2003-09-26 | UFC 44: Undisputed | Light Heavyweight | Randy Couture def. Tito Ortiz title | Decision (unanimous) (50–44, 50–44, 50–45) | 5 | 5:00 |
| 2002-11-22 | UFC 40: Vendetta | Light Heavyweight | Tito Ortiz def. Ken Shamrock title | TKO (corner stoppage) | 3 | 5:00 |
| 2001-09-28 | UFC 33: Victory in Vegas | Light Heavyweight | Tito Ortiz def. Vladimir Matyushenko title | Decision (unanimous) (50–43, 50–44, 50–44) | 5 | 5:00 |
| 2001-06-29 | UFC 32: Showdown in the Meadowlands | Light Heavyweight | Tito Ortiz def. Elvis Sinosic title | TKO (punches and elbows) | 1 | 3:32 |
| 2001-02-23 | UFC 30: Battle on the Boardwalk | Light Heavyweight | Tito Ortiz def. Evan Tanner title | KO (slam) | 1 | 0:30 |
| 2000-12-16 | UFC 29: Defense of the Belts | Light Heavyweight | Tito Ortiz def. Yuki Kondo title | Submission (cobra choke) | 1 | 1:52 |
| 2000-04-14 | UFC 25: Ultimate Japan 3 | Light Heavyweight | Tito Ortiz def. Wanderlei Silva title | Decision (unanimous) | 5 | 5:00 |
| 1999-09-24 | UFC 22: Only One Can be Champion | Middleweight | Frank Shamrock def. Tito Ortiz title | TKO (submission to punches) | 4 | 4:42 |
| 1999-03-05 | UFC 19: Ultimate Young Guns | Middleweight | Tito Ortiz def. Guy Mezger | TKO (punches) | | 9:56 |
| 1999-01-08 | UFC 18: The Road to the Heavyweight Title | Middleweight | Tito Ortiz def. Jerry Bohlander | TKO (cut) | | 14:31 |
| 1997-05-30 | UFC 13: The Ultimate Force | Lightweight | Guy Mezger def. Tito Ortiz | Submission (guillotine choke) | | 3:00 |
| 1997-05-30 | UFC 13: The Ultimate Force | Lightweight | Tito Ortiz def. Wes Albritton | TKO (corner stoppage) | | 0:31 |