Osowiec [ɔˈsɔvjɛt͡s] is a village in the administrative district of Gmina Zambrów, within Zambrów County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 6 kilometres (4 mi) south of Zambrów and 64 km (40 mi) west of the regional capital Białystok.