| Fighter | Record | Last Bout |
|---|---|---|
| Abdul Rakhman Yakhyaev | 10-0-0 | 2026-10-24 |
| Adam Yandiev | 9-1-0 | 2018-09-15 |
| Adrian Yanez | 18-6-1 | 2026-07-11 |
| Alexander Yakovlev | 24-10-1 | 2020-10-24 |
| Ashley Yoder | 8-9-0 | 2023-10-14 |
| Besam Yousef | 7-4-0 | 2013-04-06 |
| Cale Yarbrough | 8-3-0 | 2008-07-19 |
| Dongi Yang | 13-3-0 | 2015-11-28 |
| Eddie Yagin | 16-7-1 | 2012-04-21 |
| Emmanuel Yarborough | 1-2-0 | 1994-09-09 |
| Gauge Young | 11-4-0 | 2026-08-22 |
| Gilbert Yvel | 39-16-1 (1 NC) | 2010-10-23 |
| Hu Yaozong | 3-3-0 | 2021-10-30 |
| Jamie Yager | 8-4-0 | 2010-06-19 |
| Jason Young | 9-6-0 | 2012-09-29 |
| Ji Yeon Kim | 9-7-2 | 2023-05-13 |
| Jianping Yang | 11-4-1 | 2014-08-23 |
| Jinh Yu Frey | 11-10-0 | 2023-10-21 |
| John Yannis | 10-5-0 | 2026-06-06 |
| JooSang Yoo | 9-1-0 | 2026-09-19 |
| Keiichiro Yamamiya | 45-35-10 | 1999-11-19 |
| Kenichi Yamamoto | 5-12-2 | 2000-12-16 |
| Masutatsu Yano | 2-4-1 | 1999-11-19 |
| Mohammad Yahya | 12-6-0 | 2025-07-26 |
| Norifumi Yamamoto | 18-6-0 (2 NC) | 2015-02-28 |
| Petr Yan | 20-5-0 | 2026-10-24 |
| Rani Yahya | 28-12-1 (1 NC) | 2024-04-27 |
| Rob Yundt | 9-5-0 | 2008-06-21 |
| Shane Young | 13-8-0 | 2023-09-09 |
| Shanna Young | 9-6-0 | 2022-11-05 |
| Sodiq Yusuff | 13-5-0 | 2025-05-17 |
| Song Yadong | 24-9-1 (1 NC) | 2026-08-29 |
| SuYoung You | 16-4-0 (2 NC) | 2026-03-14 |
| Wu Yanan | 13-6-0 | 2022-08-20 |
| Yadier del Valle | 11-1-0 | 2026-08-08 |
| Yair Rodriguez | 21-6-0 (1 NC) | 2025-04-12 |
| Yan Cabral | 13-3-0 | 2016-05-08 |
| Yan Xiaonan | 19-6-0 (1 NC) | 2026-08-29 |
| Yana Santos | 17-8-0 (1 NC) | 2025-10-04 |
| Yanal Ashmouz | 8-2-0 | 2025-06-07 |
| Yancy Medeiros | 15-8-0 (1 NC) | 2021-06-26 |
| Yanis Ghemmouri | 12-3-0 | 2024-06-29 |
| Yao Zhikui | 2-4-0 | 2016-11-26 |
| Yaotzin Meza | 21-11-0 (1 NC) | 2016-02-27 |
| Yaroslav Amosov | 30-1-0 | 2026-05-09 |
| Yasuhiro Urushitani | 21-8-6 | 2012-11-10 |
| Yazmin Jauregui | 11-2-0 | 2026-09-26 |
| YiSak Lee | 8-2-0 | 2026-05-30 |
| Yizha | 26-6-0 | 2026-01-31 |
| Yoel Romero | 13-5-0 | 2020-03-07 |