| Fighter | Record | Last Bout |
|---|---|---|
| Wu Yanan | 13-6-0 | 2022-08-20 |
| Wulijiburen | 20-9-0 | 2019-02-09 |
| Xavier Foupa-Pokam | 32-22-0 | 2009-05-23 |
| Xiao Long | 27-12-0 | 2026-08-29 |
| Xiong Jingnan | 19-4-0 | 2026-08-29 |
| 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 |
| Yohan Lainesse | 9-3-0 | 2024-01-20 |
| Yoislandy Izquierdo | 10-4-0 | 2012-07-07 |
| Yoji Anjo | 0-5-1 | 2000-12-16 |
| Yorgan De Castro | 6-3-0 | 2021-04-10 |
| Yosdenis Cedeno | 10-6-1 | 2015-07-11 |
| Yoshihiro Akiyama | 14-6-0 (2 NC) | 2015-11-28 |
| Yoshiki Takahashi | 30-27-3 (1 NC) | 1997-02-07 |
| Yoshinori Horie | 8-2-0 | 2019-07-27 |
| Yoshiyuki Yoshida | 18-9-0 | 2010-05-08 |
| Yousri Belgaroui | 10-3-0 | 2026-09-12 |
| Youssef Zalal | 18-6-1 | 2026-04-25 |
| Yui Chul Nam | 18-8-1 | 2015-11-28 |
| Yuki Kondo | 60-33-9 | 2001-06-29 |
| Yuki Sasaki | 25-22-2 | 2006-08-17 |
| Yuneisy Duben | 6-2-0 (1 NC) | 2026-06-06 |
| Yuri Vaulin | 0-1-0 | 1997-07-27 |
| Yuri Villefort | 10-5-0 | 2013-09-04 |
| Yusaku Kinoshita | 6-3-0 | 2023-08-26 |
| Yushin Okami | 34-12-0 | 2018-12-01 |
| Yusuke Kasuya | 9-3-0 | 2016-11-26 |
| Yuta Sasaki | 21-6-2 | 2018-11-17 |
| Yves Edwards | 42-22-1 (1 NC) | 2014-11-22 |
| Yves Jabouin | 20-11-0 | 2015-08-23 |
| Zabit Magomedsharipov | 18-1-0 | 2019-11-09 |
| Zac Pauga | 7-3-0 | 2024-02-10 |
| Zach Light | 9-11-0 | 2002-06-22 |
| Zach Makovsky | 20-8-0 | 2016-12-10 |
| Zach Reese | 10-4-0 (1 NC) | 2026-07-11 |
| Zachary Scroggin | 7-1-0 | 2024-11-09 |