Gianni Lonzi is an Italian water polo player who competed in the 1960 Summer Olympics, in the 1964 Summer Olympics, and in the 1968 Summer Olympics. He was born in Florence. In 1960 he was a member of the Italian water polo team which won the gold medal. He played five matches. Four years later he finished fourth with the Italian team in the water polo competition at the Tokyo Games. He played six matches. At the 1968 Games he was part of the Italian team which finished again fourth in the Olympic water polo tournament. He played all nine matches. 

August 4th, 1938 in Florence (Age 86)