Gmina Kamień Krajeński is an urban-rural gmina in Sępólno County, Kuyavian-Pomeranian Voivodeship, in north-central Poland. Its seat in the historic Krajna region is the town of Kamień Krajeński, which lies approximately 10 kilometres (6 mi) north of Sępólno Krajeńskie and 56 km (35 mi) north-west of Bydgoszcz.