Pentti Olavi Hämäläinen (19 December 1929 – 11 December 1984) was a Finnishboxer. He competed at the 1952 and 1956 Olympics and won a gold and a bronze medal, respectively. He won two more bronze medals at European championships in 1951 and 1955. Domestically he won six Finnish titles between 1951 and 1956, two in flyweight, two in bantamweight and two in featherweight division. After the 1956 Olympics he turned professional and won five consecutive bouts. He lost his sixth bout in 1959 and retired from boxing, after which he worked as a mechanic and a policeman. Four of his brothers also competed in boxing at the national level.