The Sicilian Mafia, also known as simply the Mafia and frequently referred to by members as Cosa Nostra (Italian pronunciation: [ˈkɔsa ˈnɔstra], our thing), is a criminal syndicate in Sicily, Italy. It is a loose association of criminal groups that share a common organisational structure and code of conduct. The basic group is known as a "family", "clan", or "cosca".[1] Each family claims sovereignty over a territory, usually a town or village or a neighbourhood (borgata) of a larger city, in which it operates its rackets. Its members call themselves "men of honour", although the public often refers to them as "mafiosi". The Mafia's core activities are protection racketeering, the arbitration of disputes between criminals, and the organizing and oversight of illegal agreements and transactions.[2][3]

Following waves of emigration, the Mafia has spread to other countries such as the United States and Canada.