Don Carlo Caracciolo, 9th Prince of Castagneto, 4th Duke of Melito (Florence, 23 October 1925 – Rome, 15 December 2008) was an Italian publisher. He created Gruppo Editoriale L’Espresso, one of Italy's leading publishing groups. He was known as "the editor prince," referring to his aristocratic birth and elegant manner.
The oldest of three children, Caracciolo was born in Florence to Filippo Caracciolo, 8th Principe di Castagneto, 3rd Duca di Melito and American heiress Margaret Clarke. He was an older brother to Marella Agnelli, the wife of Fiat chairman Gianni Agnelli and half-sibling of film producer Ettore Rosboch von Wolkenstein (whose daughter Bloomberg journalist Elisabetta "Lili", Carlo's goddaughter, married Prince Amedeo of Belgium, Archduke of Austria-Este). At 18, he fought in the Italian resistance in World War II. After the war he attended Harvard Law School and worked for a New York law firm that had as a partner Allen Dulles, future head of the CIA. In the United States he began to show a serious interest in publishing.
In 1951, he moved into publishing in Milan, and in 1955 set up the N.E.R. (Nuove Edizioni Romane) publishing house with the progressive industrialist Adriano Olivetti, manufacturer of Olivetti typewriters. In October 1955 the company founded the news magazine L'Espresso with editors Arrigo Benedetti and Eugenio Scalfari.
Caracciolo was a man of the liberal left. He disdained his aristocratic title, but betrayed it in his elegance of dress and manner. He believed that a modern postwar Italian republic should be run on lay rather than religious principles, and his news outlets campaigned for reform of the laws governing divorce and abortion.