John Caldwell (7 May 1938 in Belfast – 10 July 2009) was an Irish boxer who won the bronze medal in the flyweight (– 51 kg) division at the 1956 Summer Olympics in Melbourne. Caldwell was considered a supreme fighter whose class and skill saw him claim a medal in 1956 and the world bantamweight crown in 1961. He enjoyed a magnificent career as an amateur and professional in which he contested 275 bouts, winning on all but ten occasions.