Joshua L. 'Josh' Barnett (born November 10, 1977, in Seattle, Washington) is an American heavyweight mixed martial arts (MMA) fighter and a professional wrestler.

Since his contract with World Victory Road is not exclusive, Barnett can join other MMA events. Barnett participated in the inaugural MMA event held by Affliction Entertainment, a division of a United States-based clothing company, in July 2008. Seven years after his only knockout loss to Pedro Rizzo, he avenged that loss at Affliction: Banned with a knockout of his own in the second round.

In January 2009, Barnett fought Pride veteran Gilbert Yvel at Affliction: Day of Reckoning. Barnett defeated Yvel by a submission resulting from strikes in the third round. His next match-up is likely to be a title shot against Fedor Emelianenko for the World Alliance of Mixed Martial Arts (WAMMA) Heavyweight Championship, probably at the next Affliction event.