Niewodowo [ɲɛvɔˈdɔvɔ] is a village in the administrative district of Gmina Piątnica, within Łomża County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 9 kilometres (6 mi) south-east of Piątnica, 9 km (6 mi) east of Łomża, and 65 km (40 mi) west of the regional capital Białystok.