Bienno (Camunian: Bién) is an Italian comune in Val Camonica, province of Brescia, Lombardy. It is one of I Borghi più belli d'Italia ("The most beautiful villages of Italy").

The village is located in Val Grigna, on the northern side of the river Grigna. It is bordered by other towns such as: Bagolino, Berzo Inferiore, Bovegno, Breno, Cividate Camuno, Collio, Prestine.

In 1295 a dispute occurred with the neighbouring village Bovegno regarding some high pastures.

On 25 January 1350 the bishop of Brescia invested iure feuds for a tenth of the rights in the territories of the Municipality of Bienno (vicinia) and men of Bienno. This also happened back in 1295, 1336, and later in 1388, 1423 and 1486.