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''For the genus of tilt-legged flies, see '' Crosa (fly).

Crosa is a comune (municipality) in the Province of Biella in the Italian region Piedmont, located about northeast of Turin and about northeast of Biella. As of 31 December 2004, it had a population of 332 and an area of .

Crosa borders the following municipalities: Casapinta, Cossato, Lessona, Strona.