Koszalin County () is a unit of territorial administration and local government (powiat) in West Pomeranian Voivodeship, north-western Poland, on the Baltic coast. It came into being on January 1, 1999, as a result of the Polish local government reforms passed in 1998. Its administrative seat is the city of Koszalin, although the city is not part of the county (it constitutes a separate city county). The county contains three towns: Sianów, north-east of Koszalin, Bobolice, south-east of Koszalin, and Polanów, east of Koszalin.