Klęśnik [ˈklɛ̃ɕnik] is a settlement in the administrative district of Gmina Szydłowo, within Piła County, Greater Poland Voivodeship, in west-central Poland. It lies approximately 7 kilometres (4 mi) north of Szydłowo, 12 km (7 mi) north-west of Piła, and 93 km (58 mi) north of the regional capital Poznań.