Paruzzaro is a comune in the Province of Novara in the Italian region of Piedmont, located about 100 kilometres northeast of Turin and about 30 kilometres north of Novara. Paruzzaro borders the following municipalities: Arona, Gattico-Veruno, Invorio, and Oleggio Castello. The municipal territory is home to the Romanesque church of San Marcello. There is a fresco cycle by 15th–16th-century local artists in the church.