Nowosiedliny [nɔvɔɕɛdˈlinɨ] is a village in the administrative district of Gmina Miastkowo, within Łomża County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 7 kilometres (4 mi) west of Miastkowo, 25 km (16 mi) west of Łomża, and 97 km (60 mi) west of the regional capital Białystok.