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, and 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.

They were originally founded as the police force of the Kingdom of Sardinia, the forerunner of the Kingdom of Italy. During the process of Italian unification, the Carabinieri were appointed as the "First Force" of the new national military organization. Although the Carabinieri assisted in the suppression of opposition during the rule of Benito Mussolini, they were also responsible for his downfall and many units were disbanded during World War II by Nazi Germany, which resulted in large numbers of Carabinieri joining the Italian resistance movement.

In 2000, they were separated from the Army to become a separate branch of the Italian Armed Forces. Carabinieri have policing powers that can be exercised at any time and in any part of the country, and they are always permitted to carry their assigned weapon as personal equipment (Beretta 92FS pistols).

The Carabinieri are often referred to as "La Benemerita" (The Reputable or The Meritorious) as they are a trusted and prestigious law enforcement institution in Italy. The first official account of the use of this term to refer to the Carabinieri dates back to 24 June 1864.

Inspired by the French gendarmerie, the corps was created by King Victor Emmanuel I of Sardinia with the aim of providing the Savoyard state of the Kingdom of Sardinia with a police corps. After French soldiers had occupied Turin at the end of the 18th century and later abandoned it to the Kingdom of Sardinia, the Royal Carabinieri Corps was instituted under the Royal Patents of 13 July 1814. The name is derived from the French word carabinier, meaning "soldier armed with a carbine."

The new force was divided into divisions on the scale of one division for each province. The divisions were further divided into companies and subdivided into lieutenancies, which commanded and coordinated the local police stations and were distributed throughout the national territory in direct contact with the public.

In 1868, the Cuirassiers Regiment or Corazzieri was formed, initially as a cavalry escort of honour for the sovereign, and since 1946 for the President of the Republic. The Italian unification saw the number of divisions increased, and on 24 January 1861, the Carabinieri were appointed the "First Force" of the new national military organization.

In May 1915, Italian troops marched to encompass South Tyrol, a territory of their former allies Austria-Hungary, in the Italian front . The defenders had sufficient time to prepare strong fortifications there, and at the Karst Plateau to the east. The Italians, under the overall command of General Luigi Cadorna, found themselves repeatedly repulsed in harsh fighting. The role of the Carabinieri was to act as barrier troops, setting up machine gun posts to control the rear of the attacking regiments and prevent desertion.