| Fighter | Record | Last Bout |
|---|---|---|
| Adam Yandiev | 9-1-0 | 2018-09-15 |
| 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 |
| 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 |
| Keiichiro Yamamiya | 45-35-10 | 1999-11-19 |
| Kenichi Yamamoto | 5-12-2 | 2000-12-16 |
| Masutatsu Yano | 2-4-1 | 1999-11-19 |
| Norifumi Yamamoto | 18-6-0 (2 NC) | 2015-02-28 |
| 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 |
| Wu Yanan | 13-6-0 | 2022-08-20 |
| Yan Cabral | 13-3-0 | 2016-05-08 |
| 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 |
| Yasuhiro Urushitani | 21-8-6 | 2012-11-10 |
| 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 |
| 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 |
| 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 |