| Date |
Champion |
Defeated |
| 12.27.2008 |
Frank Mir (Interim Title) |
Antônio Rodrigo Nogueira |
| 11.15.2008 |
Brock Lesnar |
Randy Couture |
| 02.02.2008 |
Antônio Rodrigo Nogueira (Interim Title) |
Tim Sylvia |
| 03.03.2007 |
Randy Couture (3) |
Tim Sylvia |
| 04.15.2006 |
Tim Sylvia (2) |
Andrei Arlovski |
| 08.12.2005 |
Andrei Arlovski |
---Promoted To Undisputed Champion |
| 02.05.2005 |
Andrei Arlovski |
Tim Sylvia (Claimed Interim Title After Injury To Mir) |
| 06.19.2004 |
Frank Mir |
Tim Sylvia |
| 09.01.2003 |
***Title Vacated*** |
---Tim Sylvia (Steroids) |
| 02.28.2003 |
Tim Sylvia |
Ricco Rodriguez |
| 09.27.2002 |
Ricco Rodriguez |
Randy Couture |
| 03.23.2002 |
***Title Vacated*** |
---Josh Barnett (Steroids) |
| 03.22.2002 |
Josh Barnett |
Randy Couture |
| 11.17.2000 |
Randy Couture (2) |
Kevin Randleman |
| 11.19.1999 |
Kevin Randleman |
Pete Williams |
| 06.01.1999 |
***Title Vacated*** |
---Bas Rutten (Left UFC) |
| 05.07.1999 |
Bas Rutten |
Kevin Randleman |
| 01.01.1998 |
***Title Vacated*** |
---Randy Couture (Contract Dispute) |
| 12.21.1997 |
Randy Couture |
Maurice Smith |
| 07.27.1997 |
Maurice Smith |
Mark Coleman |
| 02.07.1997 |
Mark Coleman |
Dan Severn |
