Ivan Fedorovych Firtsak-Kroton (autonym Firtsak) (Ukrainian: ???´? ??´??????? ??´????-??????; July 28, 1899, Bilky (now Irshava district of Zakarpattia of Ukraine) — November 10, 1970, the same place) — was a Rusyn circus performer, athlete, wrestler, boxer and freestyle wrestler, once said to be the world's strongest man.