The Carabinieri are the national gendarmerie of Italy who primarily carry out domestic and foreign policing duties. It is one of Italy's main law enforcement agencies, alongside the Polizia di Stato and the Guardia di Finanza. As with the Guardia di Finanza but in contrast to the Polizia di Stato, the Carabinieri are a military force. As the fourth branch of the Italian Armed Forces, they come under the authority of the Ministry of Defence; for activities related to inland public order and security, they functionally depend on the Ministry of the Interior. In practice, there is a significant overlap between the jurisdiction of the Polizia di Stato and Carabinieri, although both of them are contactable through 112, the European Union's Single Emergency number. Unlike the Polizia di Stato, the Carabinieri have responsibility for policing the military, and a number of members regularly participate in military missions abroad.

A gendarmerie is a military force with law enforcement duties among the civilian population. The term gendarme is derived from the medieval French expression gens d'armes, which translates to "men-at-arms". In France and some Francophone nations, the gendarmerie is a branch of the armed forces that is responsible for internal security in parts of the territory, with additional duties as military police for the armed forces. It was introduced to several other Western European countries during the Napoleonic conquests. In the mid-twentieth century, a number of former French mandates and colonial possessions adopted a gendarmerie after independence. A similar concept exists in Eastern Europe in the form of Internal Troops, which are present in many countries of the former Soviet Union and its former allied countries.