See a complete list of (WSOF) World Series of Fighting title holders for each weight division. WSOF was renamed Professional Fighters League in April 2017.
- World Series of Fighting (WSOF) was formed in 2012.
- World Series of Fighting (WSOF) changed their name to Professional Fighters League in April 2017.
- The WSOF uses a ten-sided (Decagon) cage for their events.
World Series of Fighting Champions:
|Blagoy Ivanov||Heavyweight||250lb (113 kg)||Bulgaria|
|Vacant||Light Heavyweight||205lb (93 kg)|
|Vacant||Middleweight||185lb (84 kg)|
|Jon Fitch||Welterweight||170lb (77 kg)||USA|
|Vacant||Lightweight||155lb (70 kg)|
|Andre Harrison||Featherweight||145lb (66 kg)||USA|
|Bekbulat Magomedov||Bantamweight||135lb (61 kg)||Russia|
|Vacant||Flyweight||125lb (57 kg)|