Osetnik [ɔˈsɛtnik] is a village in the administrative district of Gmina Orneta, within Lidzbark County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 14 kilometres (9 mi) north-west of Orneta, 41 km (25 mi) west of Lidzbark Warmiński, and 57 km (35 mi) north-west of the regional capital Olsztyn.