Kwasowo [kfaˈsɔvɔ] (German Quatzow) is a village in the administrative district of Gmina Sławno, within Sławno County, West Pomeranian Voivodeship, in north-western Poland. It lies approximately 5 kilometres (3 mi) south of Sławno and 172 km (107 mi) north-east of the regional capital Szczecin.

For the history of the region, see History of Pomerania.

The village has a population of 519.