List of Professional Fighters League champions

Professional Fighters League (formerly the World Series of Fighting, or "WSOF") is an American mixed martial arts promotion, and the following is a history of its champions in each weight class. As well as championship history for their International promotions WSOF: Canada and WSOF Global Championship.

Men's Championship history (defunct)

 * All WSOF Championships were retired and vacated on June 7, 2018, when the PFL league format began at PFL 1. The PFL crowns seasonal champions as an alternative to recognizing a single lineal champion.

Heavyweight Championship

 * 206 to 265 lbs (93 to 120 kg)

Light Heavyweight Championship

 * 186 to 205 lbs (84 to 93 kg)

Middleweight Championship

 * 171 to 185 lbs (77 to 84 kg)

Welterweight Championship

 * 156 to 170 lbs (70 to 77 kg)

Lightweight Championship

 * 146 to 155 lbs (66 to 70 kg)

Featherweight Championship

 * 136 to 145 lbs (61 to 66 kg)

Bantamweight Championship

 * 126 to 135 lbs (57 to 61 kg)

Flyweight Championship

 * 116 to 125 lbs (53 to 57 kg)

Women's Championship history (defunct)

 * All WSOF Championships were retired and vacated on June 7, 2018 when the PFL league format began at PFL 1. The PFL crowns seasonal champions as an alternative to recognizing a single lineal champion.

Women's Strawweight Championship

 * 106 to 115 lb (48 to 52 kg)

Symbolic Titles

 * All WSOF International Championships were retired and vacated on June 7, 2018 when the PFL league format began at PFL 1. The PFL crowns seasonal champions as an alternative to recognizing a single lineal champion.

Canadian Welterweight Championship

 * 156 to 170 lbs (70 to 77 kg)

Global Heavyweight Championship

 * 206 to 265 lbs (93 to 120 kg)

Global Flyweight Championship

 * 125 lbs (57 kg)

Most wins in title bouts
The following includes all fighters with three or more championship and/or interim championship title fights. Fighters with the same number of title wins are arranged in order of most title bouts. Tournament championships are not included.

Most consecutive title defenses
The following includes all WSOF champions who were able to consecutively defend their title two times or more. Fighters with the same number of title defenses are listed chronologically.

Multi-division champions
Fighters who have won championships in multiple weight classes. Tournament champions are not included.

Simultaneous two division champions
This table, different from the previous one, only counts the periods in which the fighter loaded the titles simultaneously and the defenses in that period of time.

Champions by nationality
Fighters with multiple title reigns in a specific division will be counted once in the Division champions. Interim champions who have never become linear champions will be listed as interim champions.