Bioglio is a comune (municipality) in the Province of Biella in the Italian region Piedmont, located about 90 kilometres (56 mi) northeast of Turin and about 9 kilometres (6 mi) northeast of Biella. As of 31 December 2004, it had a population of 1,049 and an area of 17.8 square kilometres (6.9 sq mi).

Bioglio borders the following municipalities: Callabiana, Camandona, Mosso, Pettinengo, Piatto, Piedicavallo, Tavigliano, Ternengo, Vallanzengo, Valle Mosso, Valle San Nicolao, Veglio.