Trzeciewnica [tʂɛt͡ɕɛvˈnit͡sa] is a village in the administrative district of Gmina Nakło nad Notecią, within Nakło County, Kuyavian-Pomeranian Voivodeship, in north-central Poland. It lies approximately 5 kilometres (3 mi) north-east of Nakło nad Notecią and 25 km (16 mi) west of Bydgoszcz.