Osowiec [ɔˈsɔvjɛt͡s] is a village in the administrative district of Gmina Zbójna, within Łomża County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 5 kilometres (3 mi) south-west of Zbójna, 25 km (16 mi) west of Łomża, and 97 km (60 mi) west of the regional capital Białystok.