|Frank Shamrock||December 21, 1997||Yokohama, Japan||-a-|
|Tito Ortiz||April 14, 2000||Tokyo, Japan||-b-|
|Randy Couture||June 6, 2003||Las Vegas, Nevada||-c-|
|Vitor Belfort||January 31, 2004||Las Vegas, Nevada|
|Randy Couture ||August 21, 2004||Las Vegas, Nevada|
|Chuck Liddell||April 16, 2005||Las Vegas, Nevada|
|Quinton Jackson||May 26, 2007||Las Vegas, Nevada|
|Forrest Griffin||July 5, 2008||Las Vegas, Nevada|
|Rashad Evans||December 27, 2008||Las Vegas, Nevada|
-a- Defeated Kevin Jackson to win title. Retires as champion.
-b- Defeated Vanderlei Silva for vacant title.
-c- Defeated Chuck Liddell for the belt. Liddell was the #1 contender to Tito Ortiz, title held up after Ortiz was repeatedly unavailable for the Liddell fight.