Aldo Nadi (29 April 1899 – 10 November 1965) was an Italian fencing champion.
Nadi emigrated to the United States in 1935. He taught fencing in New York City from 1935 to 1943, and in 1943 published a book On Fencing. Also in 1943, he relocated to Los Angeles, California, where he continued to teach fencing in his own school, in addition to occasionally coaching actors for fencing scenes in films.
Nadi was known for his real-life duels. At the 1920 Olympics, he fought Italian weightlifter Filippo Bottino with a riding whip, while Bottino used a wooden beam. The duel ended very quickly as Nadi struck Bottino's hand, causing him to drop the weapon. Later Nadi fought and severely injured a journalist who had mocked him. He also challenged a fellow fencing champion Edoardo Mangiarotti because he felt that Mangiarotti was favored over him by the Italian Olympic Committee. Nadi proposed to use pistols, which Mangiarotti declined.
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