Cavaglià (Italian: [kavaʎˈʎa]; Piedmontese: Cavajà) is a comune (municipality) in the Province of Biella in the Italian region of Piedmont , located about 50 kilometres (31 mi) northeast of Turin and about 20 kilometres (12 mi) south of Biella.

Cavaglià borders the following municipalities: Alice Castello , Carisio , Dorzano , Roppolo , Salussola , Santhià . Sights include Rondolino Castle, the Baroque church of St. Michael Archangel, the neo-Renaissance church of Santa Maria di Babilone, and an archaeological site with menhirs from as early as the Iron Age.