|Ken Shamrock||July 14, 1995||Casper, Wyoming||-a-|
|Dan Severn||May 17, 1996||Detroit, Michigan||-b-|
|Mark Coleman||February 7, 1997||Dothan, Alabama|
|Maurice Smith||July 27, 1997||Birmingham, Alabama||-c-|
|Randy Couture||December 21, 1997||Yokohama, Japan||-d-|
|Bas Rutten||May 7, 1999||Birmingham, Alabama||-e-|
|Kevin Randleman||November 14, 1999||Yokohama, Japan||-f-|
|Randy Couture ||November 17, 2000||Atlantic City, New Jersey|
|Josh Barnett||March 30, 2002||Las Vegas, Nevada||-g-|
|Ricco Rodriguez||September 27, 2002||Uncasville, Connecticut||-h-|
|Tim Sylvia||February 28, 2003||Atlantic City, New Jersey||-i-|
|Frank Mir||June 19, 2004||Las Vegas, Nevada|
|Andrei Arlovsky||February 5, 2005||Las Vegas, Nevada||-j-|
|Tim Sylvia ||April 15, 2006||Anaheim, California|
|Randy Couture ||March 3, 2007||Columbus, Ohio|
|Antonio Rodrigo Nogueira||February 2, 2008||Las Vegas, Nevada||-k-|
|Brock Lesnar||November 15, 2008||Las Vegas, Nevada||-l-|
|Frank Mir ||December 27, 2008||Las Vegas, Nevada||-m-|
-a- Defeated Dan Severn to win the title.
-b- Won via split decision.
-c- Won via split decision.
-d- Won via split decision. Title vacated on October 18, 1998 due to lack of defenses.
-e- Defeated Kevin Randleman via split decision to win vacant belt. Title then vacated.
-f- Defeated Pete Williams via unanimous decision to win vacant title.
-g- Stripped of the title due to steroid usage.
-h- Defeated Randy Couture to win vacant title.
-i- Tests positive for steroids at UFC 45. Vacates the belt upon being suspended.
-j- Defeated Tim Sylvia on February 5, 2005 for "interim" heavyweight title. Promoted to "undisputed" champ on August 12, 2006.
-k- Defeated Tim Sylvia for interim title.
-l- Defeated Couture.
-m- Defeated Nogueria for the interim title.