Avellino (ancient Abellinum), city, southern Italy, capital of Avellino Province, in Campania Region. The city is a marketing and processing center for the agricultural products of the area. Avellino has an academy and a theater and is an episcopal see. It was badly damaged by an earthquake in 1980. Nearby on Monte Vergine is a famous monastery built in 1119 on the ruins of a temple of the goddess Cybele. The abbey is visited every year by thousands of pilgrims. Population (1997 estimate) 56,072.