Avellino is a town and comune, capital of the province of Avellino in the Campania region of southern Italy. It is situated in a plain surrounded by mountains 42 km (19 mi) north-east of Naples and is an important hub on the road from Salerno to Benevento.

Some ruins of the ancient Abellinum can be seen near the modern village of Atripalda, 4 km (2.5 mi) East of modern Avellino.
The Cathedral, with its Romanesque crypt, stands on the site of a rich and famous Roman villa which was built around 129 BC and abandoned after the eruption of Vesuvius and associated earthquake in 346.
There are some remains of the Lombard castle in Piazza Castello (Castle Square).