Here is a full list of the thirteen fighters who became UFC champions whilst still undefeated in their professional MMA careers, in chronological order.
Last update: June 1st, 2021.
| Date fighter became UFC champion | UFC Champion | Record at start of title reign |
| Feb 7, 1997 | Mark Coleman | 6-0 |
| Dec 21, 1997 | Randy Couture | 4-0 |
| Feb 28, 2003 | Tim Sylvia | 15-0 |
| Dec 27, 2008 | Rashad Evans | 13-0-1 |
| May 23, 2009 | Lyoto Machida | 15-0 |
| Oct 23, 2010 | Cain Velasquez | 9-0 |
| Dec 6, 2012 | Ronda Rousey | 6-0 |
| Jul 6, 2013 | Chris Weidman | 10-0 |
| Mar 14, 2015 | Joanna Jędrzejczyk | 9-0 |
| Nov 15, 2015 | Holly Holm | 10-0 |
| Dec 30, 2016 | Cody Garbrandt | 11-0 |
| Apr 7, 2018 | Khabib Nurmagomedov | 26-0 |
| Oct 6, 2019 | Israel Adesanya | 18-0 |
