|Born||25 November 1908|
|Died||14 November 1966 (aged 57)|
Gustavo Marzi (25 November 1908 – 14 November 1966) was an Italian fencer. He competed in foil and sabre events at the 1928, 1932 and 1936 Olympics and won a gold or silver medal in every event he entered, except for individual sabre in 1928, in which he finished fourth. In total he won two gold and five silver medals.
At the world championships, which were unofficial through 1935, he won 10 titles: two in the individual foil (1935, 1937), seven in team foil (1929–31, 1934–35, 1937–38) and one in team sabre (1938). He died from a lung cancer, aged 57.