Youngest champions: since 2010
Youngest fighters to win an undisputed UFC title, by age on the day.
Reigns are derived from championship bouts. When a belt was vacated or stripped outside a title fight, the reign is shown ending at the next title fight in that division, so a few run long; a title awarded without a fight (José Aldo's in 2010, for one) starts at the champion's first UFC title fight.
78 fighters.
| # | Fighter | Age | Division | Won | Ended |
|---|---|---|---|---|---|
| 1 | Jon Jones | 23 years, 243 days | Light Heavyweight | Mar 19, 2011 | May 23, 2015 |
| 2 | Joshua Van | 24 years, 57 days | Flyweight | Dec 6, 2025 | Champion |
| 3 | Jose Aldo | 24 years, 233 days | Featherweight | Apr 30, 2011 | Dec 12, 2015 |
| 4 | Rose Namajunas | 25 years, 128 days | Women's Strawweight | Nov 4, 2017 | May 11, 2019 |
| 5 | Cody Garbrandt | 25 years, 176 days | Bantamweight | Dec 30, 2016 | Nov 4, 2017 |
| 6 | Max Holloway | 25 years, 181 days | Featherweight | Jun 3, 2017 | Dec 14, 2019 |
| 7 | Ronda Rousey | 26 years, 22 days | Women's Bantamweight | Feb 23, 2013 | Nov 14, 2015 |
| 8 | Demetrious Johnson | 26 years, 40 days | Flyweight | Sep 22, 2012 | Aug 4, 2018 |
| 9 | Dominick Cruz | 26 years, 115 days | Bantamweight | Jul 2, 2011 | Feb 1, 2014 |
| 10 | Anthony Pettis | 26 years, 216 days | Lightweight | Aug 31, 2013 | Mar 14, 2015 |
| 11 | Renan Barao | 27 years, 1 day | Bantamweight | Feb 1, 2014 | May 24, 2014 |
| 12 | Ilia Topuria | 27 years, 27 days | Featherweight | Feb 17, 2024 | Apr 12, 2025 |
| 13 | Carla Esparza | 27 years, 63 days | Women's Strawweight | Dec 12, 2014 | Mar 14, 2015 |
| =14 | Conor McGregor | 27 years, 151 days | Featherweight | Dec 12, 2015 | Jun 3, 2017 |
| =14 | Petr Yan | 27 years, 151 days | Bantamweight | Jul 11, 2020 | Mar 6, 2021 |
| 16 | Brandon Moreno | 27 years, 187 days | Flyweight | Jun 12, 2021 | Jan 22, 2022 |
| 17 | Joanna Jedrzejczyk | 27 years, 208 days | Women's Strawweight | Mar 14, 2015 | Nov 4, 2017 |
| 18 | Jessica Andrade | 27 years, 228 days | Women's Strawweight | May 11, 2019 | Aug 31, 2019 |
| 19 | Junior Dos Santos | 27 years, 286 days | Heavyweight | Nov 12, 2011 | Dec 29, 2012 |
| 20 | Amanda Nunes | 28 years, 40 days | Women's Bantamweight | Jul 9, 2016 | Dec 11, 2021 |
| 21 | Cain Velasquez | 28 years, 87 days | Heavyweight | Oct 23, 2010 | Nov 12, 2011 |
| 22 | Benson Henderson | 28 years, 101 days | Lightweight | Feb 25, 2012 | Aug 31, 2013 |
| 23 | TJ Dillashaw | 28 years, 106 days | Bantamweight | May 24, 2014 | Jan 17, 2016 |
| 24 | Mauricio Rua | 28 years, 164 days | Light Heavyweight | May 8, 2010 | Mar 19, 2011 |
| 25 | Frankie Edgar | 28 years, 176 days | Lightweight | Apr 10, 2010 | Feb 25, 2012 |
| 26 | Jack Della Maddalena | 28 years, 242 days | Welterweight | May 10, 2025 | Nov 15, 2025 |
| 27 | Sean O'Malley | 28 years, 299 days | Bantamweight | Aug 19, 2023 | Sep 14, 2024 |
| 28 | Nicco Montano | 28 years, 350 days | Women's Flyweight | Dec 1, 2017 | Dec 8, 2018 |
| 29 | Chris Weidman | 29 years, 19 days | Middleweight | Jul 6, 2013 | Dec 12, 2015 |
| 30 | Khabib Nurmagomedov | 29 years, 199 days | Lightweight | Apr 7, 2018 | May 15, 2021 |
| 31 | Miesha Tate | 29 years, 200 days | Women's Bantamweight | Mar 5, 2016 | Jul 9, 2016 |
| 32 | Alexa Grasso | 29 years, 207 days | Women's Flyweight | Mar 4, 2023 | Sep 14, 2024 |
| 33 | Jiri Prochazka | 29 years, 240 days | Light Heavyweight | Jun 11, 2022 | Dec 10, 2022 |
| 34 | Natalia Silva | 29 years, 242 days | Women's Flyweight | Oct 3, 2026 | Champion |
| 35 | Dricus Du Plessis | 30 years, 6 days | Middleweight | Jan 20, 2024 | Aug 16, 2025 |
| 36 | Zhang Weili | 30 years, 18 days | Women's Strawweight | Aug 31, 2019 | Apr 24, 2021 |
| 37 | Israel Adesanya | 30 years, 75 days | Middleweight | Oct 5, 2019 | Nov 12, 2022 |
| 38 | Rafael Dos Anjos | 30 years, 139 days | Lightweight | Mar 14, 2015 | Jul 7, 2016 |
| 39 | Johny Hendricks | 30 years, 184 days | Welterweight | Mar 15, 2014 | Dec 6, 2014 |
| 40 | Valentina Shevchenko | 30 years, 276 days | Women's Flyweight | Dec 8, 2018 | Mar 4, 2023 |
| =41 | Leon Edwards | 30 years, 360 days | Welterweight | Aug 20, 2022 | Jul 27, 2024 |
| =41 | Islam Makhachev | 30 years, 360 days | Lightweight | Oct 22, 2022 | Jun 28, 2025 |
| 43 | Luke Rockhold | 31 years, 56 days | Middleweight | Dec 12, 2015 | Jun 4, 2016 |
| 44 | Alexander Volkanovski | 31 years, 76 days | Featherweight | Dec 14, 2019 | Feb 17, 2024 |
| 45 | Khamzat Chimaev | 31 years, 107 days | Middleweight | Aug 16, 2025 | May 9, 2026 |
| 46 | Henry Cejudo | 31 years, 176 days | Flyweight | Aug 4, 2018 | Jul 18, 2020 |
| 47 | Charles Oliveira | 31 years, 210 days | Lightweight | May 15, 2021 | Oct 22, 2022 |
| 48 | Aljamain Sterling | 31 years, 218 days | Bantamweight | Mar 6, 2021 | Aug 19, 2023 |
| 49 | Jamahal Hill | 31 years, 247 days | Light Heavyweight | Jan 21, 2023 | Nov 11, 2023 |
| 50 | Kamaru Usman | 31 years, 295 days | Welterweight | Mar 2, 2019 | Aug 20, 2022 |