Avellino (ävāl-lē´nō), city (1991 pop. 55,662), capital of Avellino prov., Campania, S Italy. It is an agricultural and light manufacturing center. Although damaged by earthquakes in 1930 and 1980, the city has retained much of its medieval aspect. Of note are the 12th-century cathedral and the ruins of a castle (9th–10th cent.). Near Avellino is the Benedictine convent and pilgrimage shrine of Monte Vergine (founded early 12th cent.).