László Papp

László Papp (25 March 1926 – 16 October 2003) was a Hungarian professional boxer from Budapest. He was left-handed and won gold medals in the 1948 Summer Olympics in London, the 1952 Summer Olympics in Helsinki, and the 1956 Summer Olympics held in Melbourne, Australia. In his final Olympic competition he became the first boxer in Olympic history to win three successive gold medals. He won 12 of his 13 Olympic fights without losing a round, dropping only one, in his last Olympic final, to American boxer José Torres.

There was not another triple gold medalist for 20 years, when Teófilo Stevenson won three, followed by Félix Savón as the third of the three men to accomplish the feat. His biography at Hungary.hu

Boxing record for László Papp from BoxRec (registration required)

International Boxing Hall of Fame Bio

Amateur Record at the Wayback Machine (archived October 27, 2009)