Jadwiżyn, Kuyavian-Pomeranian Voivodeship  Jadwiżyn () is a village in the administrative district of Gmina Sadki, within Nakło County, Kuyavian-Pomeranian Voivodeship, in north-central Poland. It lies approximately south-west of Sadki, west of Nakło nad Notecią, and west of Bydgoszcz. The village has a population of 210.