Reino is a comune (municipality) in the Province of Benevento in the Italian region Campania, located about 70 km northeast of Naples and about 15 km north of Benevento. As of 1 November 2023, it had a population of 1,085 and an area of 23.59 km<sup>2</sup>.
Reino borders the following municipalities: Circello, Colle Sannita, Fragneto l'Abate, Pesco Sannita, San Marco dei Cavoti.