Bieno (Bién in local dialect) is a comune (municipality) in Trentino in the northern Italian region Trentino-Alto Adige/Südtirol, located about east of Trento. As of 31 December 2004, it had a population of 447 and an area of .
Bieno borders the following municipalities: Pieve Tesino, Scurelle, and Strigno.