Koszalin County (Polish: powiat koszaliński) 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.

The county covers an area of 1,669.09 square kilometres (644.4 sq mi).

The county is subdivided into eight gminas (three urban-rural and five rural).

These are listed in the following table, in descending order of population.