Kalsko [ˈkalskɔ] (formerly German Kalzig) is a village in the administrative district of Gmina Międzyrzecz, within Międzyrzecz County, Lubusz Voivodeship, in western Poland. It lies approximately 8 kilometres (5 mi) north of Międzyrzecz, 36 km (22 mi) south-east of Gorzów Wielkopolski, and 64 km (40 mi) north of Zielona Góra.