John Alexander Duha (February 16, 1875 – January 21, 1940) was an American gymnast and track and field athlete who competed in the 1904 Summer Olympics. He died in Chicago. In 1904 he won the bronze medals in the parallel bars event and team competition. In the 1904 Summer Olympics he participated in the following events: * Gymnastics combined - fourth place * Gymnastics triathlon - 22nd place * Gymnastics all-around - 24th place * Athletics triathlon - 36th place * Horizontal bar - result unknown * Vault - result unknown * Pommel horse - result unknown