Kłośnik [ˈkwɔɕnik] is a settlement in the administrative district of Gmina Postomino, within Sławno County, West Pomeranian Voivodeship, in north-western Poland. It lies approximately 3 kilometres (2 mi) south of Postomino, 12 km (7 mi) north of Sławno, and 184 km (114 mi) north-east of the regional capital Szczecin.

For the history of the region, see History of Pomerania.