Pettenasco is a comune (municipality) in the Province of Novara in the Italian region Piedmont, located about 100 km northeast of Turin and about 40 km northwest of Novara. As of 31 December 2004, it had a population of 1,318 and an area of 7.1 km². The municipality of Pettenasco contains the frazioni (subdivisions, mainly villages and hamlets) Pratolungo, Crabbia, and Poggio Luneglio. Pettenasco borders the following municipalities: Armeno, Miasino, Omegna, and Orta San Giulio.