Stefano Casiraghi (August 9, 1960 – October 3, 1990) was a sportsman and heir to an Italian oil fortune. He was a son of Fernanda and Giancarlo Casiraghi. His was best known as the second husband of Princess Caroline of Monaco.

On December 29 , 1983 he married the princess as her second husband. The couple had three children: Andrea born 1984, Charlotte born 1986 and Pierre born in 1987. They are, respectively, second, fourth and third in the line of succession to the Monegasque throne, after their mother, who is now HRH the Princess of Hanover, Hereditary Princess of Monaco.

He was killed in a speed boating accident off the coast of Monaco on October 3, 1990 and is buried in the Chapelle de la Paix in Monaco, which is also the resting place of his wife's paternal grandfather, Prince Pierre of Monaco.