Radońsk [ˈradɔɲsk] is a village in the administrative district of Gmina Sępólno Krajeńskie, within Sępólno County, Kuyavian-Pomeranian Voivodeship, in north-central Poland. It lies approximately 8 kilometres (5 mi) west of Sępólno Krajeńskie and 53 km (33 mi) north-west of Bydgoszcz.