János Mogyorósi-Klencs (31 March 1922 – 22 July 1997) was a Hungarian gymnast, born in Debrecen.
He competed in gymnastics events at the 1948 Summer Olympics and the 1952 Summer Olympics.
He won a bronze medal with the Hungarian team at the 1948 Summer Olympics, as well as an individual silver medal in floor exercise, and a bronze medal in horse vault.