| 2018-09-22 | UFC Fight Night: Santos vs. Anders | Middleweight | Thales Leites def. Hector Lombard | Decision (unanimous) (29–28, 29–28, 29–28) | 3 | 5:00 |
| 2018-05-12 | UFC 224: Nunes vs. Pennington | Middleweight | Jack Hermansson def. Thales Leites | TKO (punches) | 3 | 2:10 |
| 2017-10-07 | UFC 216: Ferguson vs. Lee | Middleweight | Brad Tavares def. Thales Leites | Decision (unanimous) (30–27, 30–26, 30–26) | 3 | 5:00 |
| 2017-04-22 | UFC Fight Night: Swanson vs. Lobov | Middleweight | Thales Leites def. Sam Alvey | Decision (unanimous) (30–27, 30–27, 30–27) | 3 | 5:00 |
| 2016-11-19 | UFC Fight Night: Bader vs. Nogueira 2 | Middleweight | Krzysztof Jotko def. Thales Leites | Decision (unanimous) (29–27, 30–27, 30–27) | 3 | 5:00 |
| 2016-08-06 | UFC Fight Night: Rodríguez vs. Caceres | Middleweight | Thales Leites def. Chris Camozzi | Submission (rear-naked choke) | 3 | 2:58 |
| 2016-02-27 | UFC Fight Night: Silva vs. Bisping | Middleweight | Gegard Mousasi def. Thales Leites | Decision (unanimous) (30–27, 29–28, 30–27) | 3 | 5:00 |
| 2015-07-18 | UFC Fight Night: Bisping vs. Leites | Middleweight | Michael Bisping def. Thales Leites | Decision (split) (47–48, 49–46, 48–47) | 5 | 5:00 |
| 2015-01-31 | UFC 183: Silva vs. Diaz | Middleweight | Thales Leites def. Tim Boetsch | Technical Submission (arm-triangle choke) | 2 | 3:45 |
| 2014-08-23 | UFC Fight Night: Henderson vs. dos Anjos | Middleweight | Thales Leites def. Francis Carmont | KO (punches) | 2 | 0:20 |
| 2014-04-11 | UFC Fight Night: Nogueira vs. Nelson | Middleweight | Thales Leites def. Trevor Smith | TKO (punches) | 1 | 0:45 |
| 2013-11-16 | UFC 167: St-Pierre vs. Hendricks | Middleweight | Thales Leites def. Ed Herman | Decision (unanimous) (30–27, 30–27, 30–27) | 3 | 5:00 |
| 2013-08-03 | UFC 163: Aldo vs. Korean Zombie | Middleweight | Thales Leites def. Tom Watson | Decision (unanimous) (30–27, 30–27, 30–27) | 3 | 5:00 |
| 2009-08-08 | UFC 101: Declaration | Middleweight | Alessio Sakara def. Thales Leites | Decision (split) (29–28, 27–30, 29–28) | 3 | 5:00 |
| 2009-04-18 | UFC 97: Redemption | Middleweight | Anderson Silva def. Thales Leites title | Decision (unanimous) (49–46, 48–47, 50–46) | 5 | 5:00 |
| 2008-10-25 | UFC 90: Silva vs. Côté | Middleweight | Thales Leites def. Drew McFedries | Submission (rear-naked choke) | 1 | 1:18 |
| 2008-06-07 | UFC 85: Bedlam | Middleweight | Thales Leites def. Nate Marquardt | Decision (split) (28–27, 27–28, 28–27) | 3 | 5:00 |
| 2007-08-25 | UFC 74: Respect | Middleweight | Thales Leites def. Ryan Jensen | Submission (armbar) | 1 | 3:47 |
| 2007-06-23 | The Ultimate Fighter: Team Pulver vs. Team Penn Finale | Middleweight | Thales Leites def. Floyd Sword | Submission (arm-triangle choke) | 1 | 3:50 |
| 2007-04-07 | UFC 69: Shootout | Middleweight | Thales Leites def. Pete Sell | Decision (unanimous) (30–27, 30–27, 30–27) | 3 | 5:00 |
| 2006-11-11 | The Ultimate Fighter: The Comeback Finale | Middleweight | Martin Kampmann def. Thales Leites | Decision (unanimous) (29–28, 29–27, 29–27) | 3 | 5:00 |