Jadwiżyn [jadˈviʐɨn] is a village in the administrative district of Gmina Sadki, within Nakło County, Kuyavian-Pomeranian Voivodeship, in north-central Poland. It lies approximately 7 kilometres (4 mi) south-west of Sadki, 16 km (10 mi) west of Nakło nad Notecią, and 43 km (27 mi) west of Bydgoszcz.