Stefano Casiraghi (8 September 1960 – 3 October 1990) was an Italian speedboat racer, socialite, and businessman.
He was the son of Giancarlo Casiraghi and Fernanda Biffi, and became the second husband of Princess Caroline of Monaco.
He was famous for having set a speed record in speedboat racing and was, at the time of his death in a racing accident, the world champion of offshore powerboat racing.