World Series of Fighting 25: Lightweight Tournament was a mixed martial arts event held November 20, 2015 (2015-11-20) in Phoenix, Arizona, United States.

This event aired on NBCSN in the U.S and on Fight Network in Canada.

This event featured a one night only 8 Man Lightweight tournament to crown a number one contender for the WSOF Lightweight Championship.

[1] On August 24, 2015, it was announced that The field of eight included Islam Mamedov, Mike Ricci, Joáo Zeferino, Rich Patishnock, Jorge Patino, Brian Cobb, Brian Foster and Luis Palomino.

[2] Joe Condon replaced Brian Cobb.