Pęza [ˈpɛ̃za] is a village in the administrative district of Gmina Piątnica, within Łomża County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 6 kilometres (4 mi) north of Piątnica, 8 km (5 mi) north of Łomża, and 75 km (47 mi) west of the regional capital Białystok.