Radunek [raˈdunɛk] is a village in the administrative district of Gmina Jeziora Wielkie, within Mogilno County, Kuyavian-Pomeranian Voivodeship, in north-central Poland. It lies approximately 5 kilometres (3 mi) north of Jeziora Wielkie, 24 km (15 mi) south-east of Mogilno, 57 km (35 mi) south-west of Toruń, and 64 km (40 mi) south of Bydgoszcz.