Hornostaje-Osada [xɔrnɔsˈtajɛ ɔˈsada] is a village in the administrative district of Gmina Mońki, within Mońki County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 1 kilometre (1 mi) north-west of Mońki and 40 km (25 mi) north-west of the regional capital Białystok.