| Fighter | Record | Last Bout |
|---|---|---|
| Klidson Abreu | 15-4-0 (1 NC) | 2020-05-30 |
| Lowell Anderson | 0-1-0 | 1999-09-24 |
| Lucas Alexander | 8-5-0 | 2025-02-01 |
| Lucas Almeida | 15-5-0 | 2025-10-11 |
| Magomed Ankalaev | 22-2-1 (1 NC) | 2026-07-25 |
| Makwan Amirkhani | 17-9-0 | 2023-03-18 |
| Mansur Abdul-Malik | 9-2-1 | 2026-08-15 |
| Marcelo Aguiar | 2-3-1 | 2000-06-09 |
| Marcio Alexandre Junior | 17-4-0 | 2015-12-12 |
| Marcus Aurelio | 22-10-0 | 2009-08-29 |
| Mariya Agapova | 10-5-0 | 2024-07-13 |
| Matt Andersen | 14-8-1 | 1996-05-17 |
| Matt Arroyo | 3-3-0 | 2009-01-31 |
| Megan Anderson | 11-5-0 | 2021-03-06 |
| Melissa Amaya | 8-0-0 | 2026-09-26 |
| Michael Aljarouj | 13-4-0 (2 NC) | 2026-09-05 |
| Michael Aswell Jr. | 11-5-0 | 2026-09-19 |
| Mike van Arsdale | 8-5-0 | 2006-02-04 |
| Mostapha Al-Turk | 6-6-0 | 2010-04-10 |
| Nick Agallar | 24-6-0 | 2003-11-21 |
| Nick Aguirre | 7-2-0 | 2023-11-18 |
| Nurullo Aliev | 12-0-0 | 2026-10-24 |
| Olivier Aubin-Mercier | 11-5-0 | 2019-07-27 |
| Omari Akhmedov | 21-6-1 | 2021-07-10 |
| Ottman Azaitar | 13-3-0 | 2024-12-14 |
| Papy Abedi | 10-4-0 | 2013-08-28 |
| Pat Audinwood | 11-2-1 | 2010-12-11 |
| Pavel Andrusca | 9-0-0 | 2026-09-05 |
| Rafael Alves | 20-12-0 | 2023-02-25 |
| Rafael Dos Anjos | 32-17-0 | 2026-10-03 |
| Raphael Assuncao | 28-10-0 | 2023-03-11 |
| Razak Al-Hassan | 13-5-0 | 2009-10-24 |
| Reese Andy | 7-3-0 | 2008-12-27 |
| Ricardo Abreu | 5-1-0 | 2015-06-06 |
| Ricardo Almeida | 13-5-0 | 2011-03-19 |
| Rich Attonito | 10-5-0 | 2011-12-10 |
| Romie Aram | 7-1-0 | 2003-04-25 |
| Rostem Akman | 6-2-0 | 2019-10-05 |
| Royce Alger | 3-2-0 | 1999-07-16 |
| Sam Adkins | 7-20-2 | 1996-09-20 |
| Sam Alvey | 33-18-1 (1 NC) | 2022-08-06 |
| Sarah Alpar | 9-6-0 | 2021-09-18 |
| Scott Adams | 8-1-0 | 2000-03-10 |
| Scott Askham | 14-4-0 | 2017-03-18 |
| Sean Alvarez | 4-3-0 | 2003-04-25 |
| Shamil Abdurakhimov | 20-8-0 | 2023-01-21 |
| Shinsho Anzai | 10-3-0 | 2018-06-23 |
| Steven Asplund | 8-2-0 | 2026-08-08 |
| Sultan Aliev | 15-3-0 | 2019-04-20 |
| Tahir Abdullayev | 20-3-0 | 2026-06-27 |