| Res. | Record | Opponent | Method | Event | Date | Round | Time | Location | Notes |
| Loss | 38–14 | Fedor Emelianenko | TKO (punches) | Bellator 237 | December 29, 2019 | 1 | 2:44 | Saitama, Japan | |
| Win | 38–13 | Wanderlei Silva | TKO (punches) | Bellator 206 | September 29, 2018 | 2 | 4:32 | San Jose, California, United States | |
| Loss | 37–13 | Chael Sonnen | Decision (unanimous) | Bellator 192 | January 20, 2018 | 3 | 5:00 | Inglewood, California, United States | Bellator Heavyweight World Grand Prix Quarterfinal. |
| Loss | 37–12 | Muhammed Lawal | Decision (unanimous) | Bellator 175 | March 31, 2017 | 3 | 5:00 | Rosemont, Illinois, United States | |
| Win | 37–11 | Satoshi Ishii | Decision (split) | Bellator 157: Dynamite 2 | June 24, 2016 | 3 | 5:00 | St. Louis, Missouri, United States | Return to Heavyweight. |
| Win | 36–11 | Fábio Maldonado | Decision (unanimous) | UFC 186 | April 25, 2015 | 3 | 5:00 | Montreal, Quebec, Canada | Catchweight (215 lbs) bout. |
| Win | 35–11 | Muhammed Lawal | Decision (unanimous) | Bellator 120 | May 17, 2014 | 3 | 5:00 | Southaven, Mississippi, United States | Won the Bellator Season 10 Light Heavyweight Tournament. |
| Win | 34–11 | Christian M'Pumbu | KO (punches) | Bellator 110 | February 28, 2014 | 1 | 4:34 | Uncasville, Connecticut, United States | Bellator Season 10 Light Heavyweight Tournament Semifinal. |
| Win | 33–11 | Joey Beltran | TKO (punches) | Bellator 108 | November 15, 2013 | 1 | 4:59 | Atlantic City, New Jersey, United States | Catchweight (210 lbs) bout. |
| Loss | 32–11 | Glover Teixeira | Decision (unanimous) | UFC on Fox: Johnson vs. Dodson | January 26, 2013 | 3 | 5:00 | Chicago, Illinois, United States | |
| Loss | 32–10 | Ryan Bader | Decision (unanimous) | UFC 144 | February 26, 2012 | 3 | 5:00 | Saitama, Japan | Catchweight (211 lbs) bout; Jackson missed weight. |
| Loss | 32–9 | Jon Jones | Submission (rear-naked choke) | UFC 135 | September 24, 2011 | 4 | 1:14 | Denver, Colorado, United States | For the UFC Light Heavyweight Championship. Fight of the Night. |
| Win | 32–8 | Matt Hamill | Decision (unanimous) | UFC 130 | May 28, 2011 | 3 | 5:00 | Las Vegas, Nevada, United States | |
| Win | 31–8 | Lyoto Machida | Decision (split) | UFC 123 | November 20, 2010 | 3 | 5:00 | Auburn Hills, Michigan, United States | |
| Loss | 30–8 | Rashad Evans | Decision (unanimous) | UFC 114 | May 29, 2010 | 3 | 5:00 | Las Vegas, Nevada, United States | |
| Win | 30–7 | Keith Jardine | Decision (unanimous) | UFC 96 | March 7, 2009 | 3 | 5:00 | Columbus, Ohio, United States | Fight of the Night. |
| Win | 29–7 | Wanderlei Silva | KO (punch) | UFC 92 | December 27, 2008 | 1 | 3:21 | Las Vegas, Nevada, United States | Knockout of the Night. |
| Loss | 28–7 | Forrest Griffin | Decision (unanimous) | UFC 86 | July 5, 2008 | 5 | 5:00 | Las Vegas, Nevada, United States | Lost the UFC Light Heavyweight Championship. Fight of the Night. Fight of the Year (2008). |
| Win | 28–6 | Dan Henderson | Decision (unanimous) | UFC 75 | September 8, 2007 | 5 | 5:00 | London, England | Defended the UFC Light Heavyweight Championship; Unified with the Pride Middleweight Championship. |
| Win | 27–6 | Chuck Liddell | KO (punches) | UFC 71 | May 26, 2007 | 1 | 1:53 | Las Vegas, Nevada, United States | Won the UFC Light Heavyweight Championship. Knockout of the Night. |
| Win | 26–6 | Marvin Eastman | KO (punches) | UFC 67 | February 3, 2007 | 2 | 3:49 | Las Vegas, Nevada, United States | |
| Win | 25–6 | Matt Lindland | Decision (split) | WFA: King of the Streets | July 22, 2006 | 3 | 5:00 | Los Angeles, California, United States | |
| Win | 24–6 | Yoon Dong-sik | Decision (unanimous) | Pride 31 – Dreamers | February 26, 2006 | 3 | 5:00 | Saitama, Japan | |
| Win | 23–6 | Hirotaka Yokoi | TKO (punches and stomps) | Pride 30 | October 23, 2005 | 1 | 4:05 | Saitama, Japan | |
| Loss | 22–6 | Maurício Rua | TKO (soccer kicks) | Pride Total Elimination 2005 | April 23, 2005 | 1 | 4:47 | Osaka, Japan | 2005 Pride Middleweight Grand Prix Opening Round. |
| Win | 22–5 | Murilo Rua | Decision (split) | Pride 29 | February 20, 2005 | 3 | 5:00 | Saitama, Japan | |
| Loss | 21–5 | Wanderlei Silva | KO (knees) | Pride 28 | October 31, 2004 | 2 | 3:26 | Saitama, Japan | For the Pride Middleweight Championship. |
| Win | 21–4 | Ricardo Arona | KO (slam) | Pride Critical Countdown 2004 | June 20, 2004 | 1 | 7:32 | Saitama, Japan | |
| Win | 20–4 | Ikuhisa Minowa | TKO (punches) | Pride Shockwave 2003 | December 31, 2003 | 2 | 1:05 | Saitama, Japan | |
| Loss | 19–4 | Wanderlei Silva | TKO (knees) | Pride Final Conflict 2003 | November 9, 2003 | 1 | 6:28 | Tokyo, Japan | 2003 Pride Middleweight Grand Prix Final. |
| Win | 19–3 | Chuck Liddell | TKO (corner stoppage) | 2 | 3:10 | 2003 Pride Middleweight Grand Prix Semifinal. |
| Win | 18–3 | Murilo Bustamante | Decision (split) | Pride Total Elimination 2003 | August 10, 2003 | 3 | 5:00 | Saitama, Japan | 2003 Pride Middleweight Grand Prix Quarterfinal. |
| Win | 17–3 | Mikhail Ilyukhin | TKO (submission to knee to the body) | Pride 26 | June 8, 2003 | 1 | 6:26 | Yokohama, Japan | |
| Win | 16–3 | Kevin Randleman | KO (knee and punches) | Pride 25 | March 16, 2003 | 1 | 6:58 | Yokohama, Japan | |
| Win | 15–3 | Igor Vovchanchyn | TKO (injury) | Pride 22 | September 29, 2002 | 1 | 7:17 | Nagoya, Japan | |
| Win | 14–3 | Sean Gray | TKO (punches) | KOTC 13 – Revolution | May 17, 2002 | 3 | 0:37 | Reno, Nevada, United States | |
| Win | 13–3 | Masaaki Satake | TKO (slam) | Pride 20 | April 28, 2002 | 1 | 7:07 | Yokohama, Japan | |
| Loss | 12–3 | Daijiro Matsui | DQ (knee to groin) | Pride 18 | December 23, 2001 | 1 | 0:14 | Fukuoka, Japan | |
| Win | 12–2 | Yuki Ishikawa | KO (punches) | Pride 17 | November 3, 2001 | 1 | 1:52 | Tokyo, Japan | |
| Win | 11–2 | Alexander Otsuka | TKO (doctor stoppage) | BattlArts: BattlArts vs. the World | October 14, 2001 | 2 | 5:00 | Tokyo, Japan | |
| Loss | 10–2 | Kazushi Sakuraba | Submission (rear-naked choke) | Pride 15 | July 29, 2001 | 1 | 5:41 | Saitama, Japan | |
| Win | 10–1 | Kenneth Williams | Submission (rear-naked choke) | Gladiator Challenge 4 | June 17, 2001 | 1 | 4:40 | Colusa, California, United States | |
| Win | 9–1 | Bryson Haubrick | TKO (submission to punches) | KOTC 8 – Bombs Away | April 29, 2001 | 1 | 1:48 | Williams, California, United States | Won the KOTC Light Heavyweight Superfight Championship. |
| Win | 8–1 | Dennis Henderson | Submission (kimura) | Gladiator Challenge 3 | April 7, 2001 | 2 | 1:15 | Friant, California, United States | |
| Win | 7–1 | Dave Taylor | TKO (corner stoppage) | Gladiator Challenge 2 | February 18, 2001 | 1 | 5:00 | Colusa, California, United States | |
| Win | 6–1 | Charlie West | Decision (unanimous) | Gladiator Challenge 1 | December 9, 2000 | 3 | 5:00 | San Jacinto, California, United States | |
| Win | 5–1 | Rob Smith | Decision (unanimous) | KOTC 6 – Road Warriors | November 29, 2000 | 2 | 5:00 | Mt. Pleasant, Michigan, United States | |
| Win | 4–1 | Warren Owsley | Submission (armbar) | Dangerzone: Night of the Beast | October 28, 2000 | 1 | 6:04 | Lynchburg, Virginia, United States | |
| Win | 3–1 | Ron Rumpf | TKO (punches) | Continental Freefighting Alliance 2 | July 19, 2000 | 1 | 1:18 | Corinth, Mississippi, United States | |