Multi-division champions
Fighters who have won championships in multiple weight classes.[37] Tournament championships and The Ultimate Fighter winners are not included.
Randy Couture is notably the first champion to hold belts in two different divisions, and one of the few to reclaim a title after being defeated. Conor McGregor is notably the first and only fighter thus far to hold multiple titles simultaneously.
| Champion | Division | Won | Lost | Defenses | Reign | Total reign |
|---|---|---|---|---|---|---|
 Randy Couture |
Heavyweight | Dec 21, 1997 (UFC Japan) | Jan ?, 1998 (stripped) | 0 | ? days | 1,478+ days |
| Nov 17, 2000 (UFC 28) | Mar 22, 2002 (UFC 36) | 2 | 490 days | |||
| Light Heavyweight | Sep 26, 2003 (UFC 44) | Jan 31, 2004 (UFC 46) | 0 | 127 days | ||
| Aug 21, 2004 (UFC 49) | Apr 16, 2005 (UFC 52) | 0 | 238 days | |||
| Heavyweight | Mar 3, 2007 (UFC 68) | Nov 15, 2008 (UFC 91) | 1 | 623 days | ||
| B.J. Penn |
Welterweight | Jan 31, 2004 (UFC 46) | May 17, 2004 (stripped) | 0 | 107 days | 919 days |
| Lightweight | Jan 19, 2008 (UFC 80) | Apr 10, 2010 (UFC 112) | 3 | 812 days | ||
 Conor McGregor |
Featherweight | Dec 12, 2015 (UFC 194) | Nov 26, 2016 (stripped) | 0 | 350 days | 644 days (ongoing) |
| Lightweight | Nov 12, 2016 (UFC 205) | – | 0 | 294 days (incumbent) |
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