Karczyn [ˈkart͡ʂɨn] is a village in the administrative district of Gmina Kruszwica, within Inowrocław County, Kuyavian-Pomeranian Voivodeship, in north-central Poland. It lies approximately 8 kilometres (5 mi) north-east of Kruszwica, 11 km (7 mi) south-east of Inowrocław, and 37 km (23 mi) south-west of Toruń.