Ariano Irpino (until 1930 Ariano di Puglia), or simply Ariano, is a comune (municipality) in the province of Avellino, in the Italian region of Campania. With a territory of 186.74 km2 and a population of 22,535 (2017), it is one of the largest settlements in the Irpinia historical district and the modern province. Located 264 km east-southeast of Rome and 104 km east-northeast of Naples, the comune was granted the official status of città ("city") by a presidential decree of 1952, October 26; it has been recognized as an arts town, too.