Niewiarowo [ɲɛvjaˈrɔvɔ] is a village in the administrative district of Gmina Trzcianne, within Mońki County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 6 kilometres (4 mi) north-east of Trzcianne, 6 km (4 mi) south-west of Mońki, and 39 km (24 mi) north-west of the regional capital Białystok.