Calogero "Don Calò" Vizzini (Italian: [kaˈlɔːdʒero vitˈtsiːni]; 24 July 1877 – 10 July 1954) was a Sicilian Mafia boss of Villalba in the Province of Caltanissetta, Sicily. Vizzini was considered to be one of the most influential and legendary Mafia bosses of Sicily after World War II until his death in 1954. In the media, he was often depicted as the "boss of bosses" – although such a position does not exist in the loose structure of Cosa Nostra.