Quaregna was a comune (municipality) in the Province of Biella in the Italian region Piedmont, located about northeast of Turin and about northwest of Biella. As of 31 December 2004, it had a population of 1,325 and an area of .
As a comune Quaregna bordered the following municipalities: Cerreto Castello, Cossato, Piatto, Valdengo, Vallanzengo, Valle San Nicolao.
From 1 January 2019 Quaregna was absorbed by the new-born municipality of Quaregna Cerreto.