| Fighter | Record | Last Bout |
|---|---|---|
| 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 |
| 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 |
| Zak Cummings | 25-7-0 | 2023-04-15 |
| Zak Ottow | 17-7-0 | 2019-03-09 |
| Zane Frazier | 4-11-0 | 1996-05-17 |
| Zarah Fairn | 6-6-0 | 2023-09-02 |
| Zarrukh Adashev | 4-4-0 | 2022-06-04 |
| Zelim Imadaev | 8-3-0 | 2020-09-05 |
| Zhalgas Zhumagulov | 14-9-0 | 2023-06-24 |
| Zhang Lipeng | 23-9-1 | 2015-05-16 |
| Zhang Tiequan | 15-4-0 | 2012-11-10 |
| Zubaira Tukhugov | 20-6-1 | 2023-02-11 |
| Zviad Lazishvili | 13-1-0 | 2021-10-23 |
| Zygimantas Ramaska | 9-3-0 | 2024-09-07 |