Yianni Diakomihalis (born John Michael Diakomihalis; April 11, 1999) is an American freestyle and folkstyle wrestler who competes at 65 kilograms and 149 pounds. In freestyle, he is a 2022 World Silver Medalist, a two-time US World Team member (2021 and 2022) and 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 three-time NCAA Division I National Champion and three-time EIWA champion out of Cornell University.