Konstantowo [kɔnstanˈtɔvɔ] is a village in the administrative district of Gmina Mrocza, within Nakło County, Kuyavian-Pomeranian Voivodeship, in north-central Poland. It lies approximately 4 kilometres (2 mi) north of Mrocza, 15 km (9 mi) north of Nakło nad Notecią, and 33 km (21 mi) north-west of Bydgoszcz.