Słońsk is a village in Sulęcin County of the Lubusz Voivodeship, in western Poland. The village borders the Ujście Warty National Park. It had town privileges from 1808 to 1947. During the Second World War, Słońsk was the site of a former Nazi concentration camp (now a museum). The village lies about 25 kilometres (or 16 miles) northwest of Sulęcin and 36 kilometres southwest of Gorzów Wielkopolski.