| Result | Record | Opponent | Method | Event | Date | Round | Time | Location | Notes |
| Win | 13-7 | Igor Pokrajac | Decision (Unanimous) | The Ultimate Fighter 12 Finale | December 4, 2010 | 3 | 5:00 | Las Vegas, Nevada, US | Pokrajac and Bonnar both received point-reductions |
| Win | 12–7 | Krzysztof Soszynski | TKO (Knee and Punches) | UFC 116: Lesnar vs. Carwin | July 3, 2010 | 2 | 3:08 | Las Vegas, Nevada, US | Won Fight of the Night Honors |
| Loss | 11–7 | Krzysztof Soszynski | TKO (Cut) | UFC 110: Nogueira vs. Velasquez | February 21, 2010 | 3 | 1:04 | Sydney, Australia | Bonnar's cut was a result of an inadvertent headbutt. |
| Loss | 11–6 | Mark Coleman | Decision (Unanimous) | UFC 100 | July 11, 2009 | 3 | 5:00 | Las Vegas, Nevada, US | |
| Loss | 11–5 | Jon Jones | Decision (Unanimous) | UFC 94: St-Pierre vs. Penn 2 | January 31, 2009 | 3 | 5:00 | Las Vegas, Nevada, US | |
| Win | 11–4 | Eric Schafer | TKO (Strikes) | UFC 77: Hostile Territory | October 20, 2007 | 2 | 2:47 | Cincinnati, Ohio, US | |
| Win | 10–4 | Mike Nickels | Submission (Rear Naked Choke) | UFC 73: Stacked | July 7, 2007 | 1 | 2:14 | Sacramento, California, US | |
| Loss | 9–4 | Forrest Griffin | Decision (Unanimous) | UFC 62: Liddell vs. Sobral | August 26, 2006 | 3 | 5:00 | Las Vegas, Nevada, US | Bonnar tested positive for boldenone after the fight |
| Loss | 9–3 | Rashad Evans | Decision (Majority) | UFC Ultimate Fight Night 5 | June 28, 2006 | 3 | 5:00 | Las Vegas, Nevada, US | |
| Win | 9–2 | Keith Jardine | Decision (Unanimous) | UFC Ultimate Fight Night 4 | April 6, 2006 | 3 | 5:00 | Las Vegas, Nevada, [US | |
| Win | 8–2 | James Irvin | Technical Submission (kimura) | UFC Ultimate Fight Night 3 | January 16, 2006 | 1 | 4:30 | Las Vegas, Nevada, US | |
| Win | 7–2 | Sam Hoger | Decision (Unanimous) | UFC Ultimate Fight Night | August 6, 2005 | 3 | 5:00 | Las Vegas, Nevada, US | |
| Loss | 6–2 | Forrest Griffin | Decision (Unanimous) | The Ultimate Fighter 1 Finale | April 9, 2005 | 3 | 5:00 | Las Vegas, Nevada, US | |
| Win | 6–1 | Sean Sallee | Submission (Triangle Choke) | IHC 7-The Crucible | June 5, 2004 | 1 | 2:28 | Hammond, Indiana, US | |
| Win | 5–1 | William Hill | TKO (Punches) | Total Fight Challenge 1 | April 24, 2004 | 1 | N/A | Hammond, Indiana, US | |
| Win | 4–1 | Brad Lynde | Submission (Rear Naked Choke) | IHC 6: Inferno | November 22, 2003 | 1 | 4:10 | Hammond, Indiana, US | |
| Loss | 3–1 | Lyoto Machida | TKO (Cut) | Jungle Fight 1 | September 13, 2003 | 1 | 4:21 | Manaus, Brazil | |
| Win | 3–0 | Jay Massey | Submission (Guillotine Choke) | UA 1: The Genesis | January 27, 2002 | 1 | 1:09 | Hammond, Indiana, US | |
| Win | 2–0 | Josh Kruger | Submission (Armbar) | IHC 3: Exodus | November 10, 2001 | 1 | 2:55 | Hammond, Indiana, US | |
| Win | 1–0 | Brian Ebersole | Submission (Guillotine Choke) | IHC 3: Exodus | November 10, 2001 | 1 | 0:51 | Hammond, Indiana, US | |
