Pleśnik [ˈplɛɕnik] is a village in the administrative district of Gmina Bisztynek, within Bartoszyce County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 12 kilometres (7 mi) east of Bisztynek, 25 km (16 mi) south-east of Bartoszyce, and 51 km (32 mi) north-east of the regional capital Olsztyn.