Karsin is a village in Koà Âcierzyna County, Pomeranian Voivodeship, in northern Poland. It is the seat of the gmina (administrative district) called Gmina Karsin. It is located within the historic region of Pomerania.
Karsin was a royal village of the Polish Crown, administratively located in the Tuchola County in the Pomeranian Voivodeship.