Jon Hess (born 1969) is an American martial artist, early mixed martial arts competitor^[1] and the co-founder of the Scientifically Aggressive Fighting Technology of America, or S.A.F.T.A., a martial art with roots in San Soo Kung Fu.

Hess, along with S.A.F.T.A. co-founder Lew Hicks, were students of Jerry Peterson, the founder of S.C.A.R.S. They took their San Soo Kung Fu black belt test together in 1993, and Hicks was chosen by Hess to corner him for the UFC.

Hess's mixed martial arts debut came in the Ultimate Fighting Championship 5 tournament, where he defeated Andy Anderson by TKO at one minute twenty-two seconds into the fight.^[1] The fight is regarded as one of the dirtiest in UFC history,^[2] and Hess was ultimately fined $2,000 for two violations of the rules against eye gouging.^[3] Hess has defended his actions, citing that "The UFC billed itself as no rules," and therefore there were no rules to break.^[2] However, despite the marketing slogan, early UFC events did have a limited list of forbidden techniques, though infractions could only result in a fine.^[4] After victory over Anderson, Hess withdrew from the tournament with a hand injury.^[3]

After his appearance in the UFC, Hess struggled to find another fight, despite publicly challenging dominant early UFC competitor Royce Gracie. Hess believes that this is because he was blacklisted by UFC promoter Art Davie.^[2] After an attempt to gain public support for a return to the UFC via opinions published in Inside Kung Fu magazine,^[3] Hess fought Vitor Belfort at SB 2-SuperBrawl 2, where he lost by KO in 12 seconds.^[1] Hess has not fought professionally since this loss, but has stated he took the Belfort fight on short notice, that if he was allowed to come back he would be "world champ", and that Belfort was "on steroids" when he beat him.^[2]

On April 25, 2010 Hess cornered Team Quest fighter Steven Tobias at Gladiator Challenge, where Tobias won his first pro fight. Since 2007, Hess has made several efforts to get into fighting shape and has suffered a number of injuries, including breaking three toes and an ankle. As of December 2014, Hess is 9-0 cornering fighters with 8 KO's and one submission.^{[citation needed]}

• Professional MMA record for Jon Hess from Sherdog
• Jon Hess at UFC