Sosnowiec (pronounced [sɔsˈnɔvjɛts] ) is a village in the administrative district of Gmina Miastkowo, within Łomża County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 4 kilometres (2 mi) south of Miastkowo, 20 km (12 mi) west of Łomża, and 92 km (57 mi) west of the regional capital Białystok.