Mario Ruspoli, 2nd Prince of Poggio Suasa (d. 1963)

Mario dei Principi Ruspoli (October 16, 1867 – January 16, 1963) was an Italian prince, son of Emanuele Ruspoli, 1st Prince of Poggio Suasa and first wife Princess Caterina Vogoride-Conachi. He was the 2nd Prince of Poggio Suasa and Prince of the Holy Roman Empire.

He was responsible for the brief development of Chatsworth, New Jersey as a resort in the early 20th century.