Castelnuovo (Castarnóvo in local dialect) is a comune (municipality) in Trentino in the northern Italian region Trentino-Alto Adige/Südtirol, located about 30 kilometres (19 mi) east of Trento. As of 31 December 2004, it had a population of 926 and an area of 13.5 square kilometres (5.2 sq mi).

Castelnuovo borders the following municipalities: Telve, Scurelle, Carzano, Borgo Valsugana, Villa Agnedo and Asiago.

Demographic evolution