Słonin [ˈswɔnin] is a village in the administrative district of Gmina Czempiń, within Kościan County, Greater Poland Voivodeship, in west-central Poland. It lies approximately 6 kilometres (4 mi) south of Czempiń, 8 km (5 mi) north-east of Kościan, and 34 km (21 mi) south of the regional capital Poznań.