Alessandro "Dado" Ruspoli, 9th Prince of Cerveteri (Italian pronunciation: [alesˈsandro ˈdaːdo ˈruspoli]; 9 December 1924 – 11 January 2005) was an occasional actor and a playboy and eccentric aristocrat, the 9th Prince of Cerveteri, 9th Marquess of Riano, 14th Count of Vignanello and Prince of the Roman Papal States.

His mother, his father's first wife Claudia dei Conti Matarazzo, who died when he was 9, was heiress to one of the largest fortunes in Brazil.

His father Francesco Ruspoli, 8th Prince of Cerveteri, later a poet, fought in both World Wars.

He was friends with Brigitte Bardot, Salvador Dalí, Truman Capote, Roger Vadim, Roman Polanski, Emmanuelle Arsan and many others.

[citation needed] Ruspoli's first marriage, in Rome on 8 December 1947, was to Nobile Francesca dei Baroni Blanc (Rome, 27 June 1920 – Milan, 27 February 1962), daughter of Nobile Mario dei Baroni Blanc and wife Anita Felici.