Ciosaniec [t͡ɕɔˈsaɲɛt͡s] is a village in the administrative district of Gmina Okonek, within Złotów County, Greater Poland Voivodeship, in north-central Poland. It lies approximately 13 kilometres (8 mi) south-west of Okonek, 28 km (17 mi) north-west of Złotów, and 122 km (76 mi) north of the regional capital Poznań.

In the 10th century the area became part of the emering Polish state, and after the country's fragmentation it was part of the Duchy of Pomerania until 1648. Afterwards it was part of Prussia and Germany, before it became again part of Poland following World War II in 1945.