Tufo is a town and comune in the province of Avellino, Campania, southern Italy.

[3] The name of the town derives from the tuff,[4] the volcanic rock that is widely present in the subsoil of the whole area of the country.

Situated in the geographical region of Irpinia, it has an area of approximately 5 square kilometres (2 sq mi) and a population density of 190 people per square kilometer.

Tufo is bordered by the municipalities Altavilla Irpina, Petruro Irpino, Prata di Principato Ultra, Santa Paolina and Torrioni.

The Sabato river flows south of the town.