Frigyes Mezei (Friedrich Wiesner; 26 September 1887 in Mór – 22 March 1938 in Budapest) was a Hungarian athlete. He competed at the 1908 Summer Olympics in London and at the 1912 Summer Olympics in Stockholm. Mezei was a member of the bronze medal Hungarian medley relay team. He was the second runner on the squad, running 200 metres. He followed Pál Simon and was followed by József Nagy and Ödön Bodor.