Karolin [kaˈrɔlin] is a village in the administrative district of Gmina Osięciny, within Radziejów County, Kuyavian-Pomeranian Voivodeship, in north-central Poland. It lies approximately 2 kilometres (1 mi) south-east of Osięciny, 15 km (9 mi) east of Radziejów, and 47 km (29 mi) south of Toruń.