The middleweight division in mixed martial arts refers to different weight classes:
- The UFC's middleweight division, which groups competitors within 171 to 185 lb (77.5 to 84 kg)
- The Shooto's middleweight class, which refers to competitors between 155 and 170 lb (70.3 and 77.1 kg)
- The ONE Championship's middleweight division follows the Pride FC model, with an upper limit of 93 kg (205 lb)
- The Road FC's middleweight division, with an upper limit of 185 lb (84 kg)
Ambiguity and clarification
For the sake of uniformity, many mixed martial arts websites refer to competitors between 171 and 185 lb (77.5 and 84 kg) as middleweights. This encompasses Shooto's light heavyweight division of the same weight limit.
The middleweight limit, as defined by the Nevada State Athletic Commission and the Association of Boxing Commissions is 185 lb (84 kg).
Professional champions
Current champions
Table accurate as of April 2023.
- Active title reign
| Organization | Reign Began | Champion | Record | Defenses |
|---|---|---|---|---|
| UFC | April 8, 2023 |
 Israel Adesanya
|
24–2 (16KO 0SUB) | 0 |
| Bellator MMA | June 24, 2022 |
 Johnny Eblen
|
13–0 (5KO 1SUB) | 1 |
| ONE Championship | October 30, 2020 |
 Reinier de Ridder
|
16–1 (3KO 11SUB) | 2 |
| Fight Nights Global | September 9, 2020 |
 Vladimir Mineev
|
16–1–1 (9KO 3SUB) | 0 |
| KSW | Vacant | |||
| Cage Warriors | April 2, 2022 |
 Christian Leroy Duncan
|
8–0 (6KO 1SUB) | 1 |
| ACA | April 9, 2021 |
Magomedrasul Gasanov
|
18–2 (5KO 1SUB) | 2 |
| Road FC | July 3, 2021 |
 In Su Hwang
|
6–1 (6KO 0SUB) | 0 |
| Legacy Fighting Alliance |
 Lucas Fernando
|
9–1 (5KO 2SUB) | 0 | |
| URCC | January 7, 2017 |
 Chris Hofmann
|
8–1 (7KO) | 1 |