Youngest champions: since 2020
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.
41 fighters.
| # | Fighter | Age | Division | Won | Ended |
|---|---|---|---|---|---|
| 1 | Joshua Van | 24 years, 57 days | Flyweight | Dec 6, 2025 | Champion |
| 2 | Ilia Topuria | 27 years, 27 days | Featherweight | Feb 17, 2024 | Apr 12, 2025 |
| 3 | Petr Yan | 27 years, 151 days | Bantamweight | Jul 11, 2020 | Mar 6, 2021 |
| 4 | Brandon Moreno | 27 years, 187 days | Flyweight | Jun 12, 2021 | Jan 22, 2022 |
| 5 | Jack Della Maddalena | 28 years, 242 days | Welterweight | May 10, 2025 | Nov 15, 2025 |
| =6 | Rose Namajunas | 28 years, 299 days | Women's Strawweight | Apr 24, 2021 | May 7, 2022 |
| =6 | Sean O'Malley | 28 years, 299 days | Bantamweight | Aug 19, 2023 | Sep 14, 2024 |
| 8 | Alexa Grasso | 29 years, 207 days | Women's Flyweight | Mar 4, 2023 | Sep 14, 2024 |
| 9 | Jiri Prochazka | 29 years, 240 days | Light Heavyweight | Jun 11, 2022 | Dec 10, 2022 |
| 10 | Natalia Silva | 29 years, 242 days | Women's Flyweight | Oct 3, 2026 | Champion |
| 11 | Dricus Du Plessis | 30 years, 6 days | Middleweight | Jan 20, 2024 | Aug 16, 2025 |
| =12 | Leon Edwards | 30 years, 360 days | Welterweight | Aug 20, 2022 | Jul 27, 2024 |
| =12 | Islam Makhachev | 30 years, 360 days | Lightweight | Oct 22, 2022 | Jun 28, 2025 |
| 14 | Khamzat Chimaev | 31 years, 107 days | Middleweight | Aug 16, 2025 | May 9, 2026 |
| 15 | Charles Oliveira | 31 years, 210 days | Lightweight | May 15, 2021 | Oct 22, 2022 |
| 16 | Aljamain Sterling | 31 years, 218 days | Bantamweight | Mar 6, 2021 | Aug 19, 2023 |
| 17 | Jamahal Hill | 31 years, 247 days | Light Heavyweight | Jan 21, 2023 | Nov 11, 2023 |
| 18 | Julianna Pena | 32 years, 114 days | Women's Bantamweight | Dec 11, 2021 | Jul 30, 2022 |
| 19 | Sean Strickland | 32 years, 194 days | Middleweight | Sep 9, 2023 | Jan 20, 2024 |
| 20 | Tom Aspinall | 32 years, 197 days | Heavyweight | Oct 25, 2025 | Champion |
| 21 | Deiveson Figueiredo | 32 years, 213 days | Flyweight | Jul 18, 2020 | Jun 12, 2021 |
| 22 | Mackenzie Dern | 32 years, 215 days | Women's Strawweight | Oct 25, 2025 | Champion |
| 23 | Magomed Ankalaev | 32 years, 279 days | Light Heavyweight | Mar 8, 2025 | Oct 4, 2025 |
| 24 | Alexandre Pantoja | 33 years, 83 days | Flyweight | Jul 8, 2023 | Dec 6, 2025 |
| 25 | Zhang Weili | 33 years, 91 days | Women's Strawweight | Nov 12, 2022 | Oct 25, 2025 |
| 26 | Merab Dvalishvili | 33 years, 248 days | Bantamweight | Sep 14, 2024 | Dec 6, 2025 |
| 27 | Israel Adesanya | 33 years, 260 days | Middleweight | Apr 8, 2023 | Sep 9, 2023 |
| 28 | Amanda Nunes | 34 years, 61 days | Women's Bantamweight | Jul 30, 2022 | Jan 20, 2024 |
| 29 | Francis Ngannou | 34 years, 203 days | Heavyweight | Mar 27, 2021 | Mar 4, 2023 |
| 30 | Carla Esparza | 34 years, 209 days | Women's Strawweight | May 7, 2022 | Nov 12, 2022 |
| 31 | Kayla Harrison | 34 years, 340 days | Women's Bantamweight | Jun 7, 2025 | Champion |
| 32 | Alex Pereira | 35 years, 128 days | Middleweight | Nov 12, 2022 | Apr 8, 2023 |
| 33 | Raquel Pennington | 35 years, 137 days | Women's Bantamweight | Jan 20, 2024 | Oct 5, 2024 |
| 34 | Carlos Ulberg | 35 years, 155 days | Light Heavyweight | Apr 11, 2026 | Champion |
| 35 | Jon Jones | 35 years, 228 days | Heavyweight | Mar 4, 2023 | Oct 25, 2025 |
| 36 | Belal Muhammad | 36 years, 18 days | Welterweight | Jul 27, 2024 | May 10, 2025 |
| 37 | Valentina Shevchenko | 36 years, 191 days | Women's Flyweight | Sep 14, 2024 | Oct 3, 2026 |
| 38 | Alexander Volkanovski | 36 years, 195 days | Featherweight | Apr 12, 2025 | Champion |
| 39 | Justin Gaethje | 37 years, 212 days | Lightweight | Jun 14, 2026 | Champion |
| 40 | Jan Blachowicz | 37 years, 215 days | Light Heavyweight | Sep 26, 2020 | Oct 30, 2021 |
| 41 | Glover Teixeira | 42 years, 2 days | Light Heavyweight | Oct 30, 2021 | Jun 11, 2022 |