|Olympic medal record|
|Men's Water Polo|
|1960 Rome||Team competition|
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.
He is married from 1968 with the Italian fencer Olympic Champion Antonella Ragno.
- Evans, Hilary; Gjerde, Arild; Heijmans, Jeroen; Mallon, Bill. "Gianni Lonzi". Olympics at Sports-Reference.com. Sports Reference LLC. Archived from the original on 2012-10-07.
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