Witunia [viˈtuɲa] is a village in the administrative district of Gmina Więcbork, within Sępólno County, Kuyavian-Pomeranian Voivodeship, in north-central Poland. It lies approximately 2 kilometres (1 mi) north-west of Więcbork, 10 km (6 mi) south of Sępólno Krajeńskie, and 45 km (28 mi) north-west of Bydgoszcz.