Yianni Diakomihalis (born John Michael Diakomihalis; April 11, 1999) is an American freestyle and folkstyle wrestler who competes at 65 kilograms and 141 pounds. In freestyle, he was the 2020 Pan American champion, 2019 US Open National Champion and a two-time age-group World Champion. As a collegiate wrestler, Diakomihalis is a two-time NCAA Division I National Champion and two-time EIWA champion out of Cornell University.