Kowalewko [kɔvaˈlɛfkɔ] is a village in the administrative district of Gmina Kcynia, within Nakło County, Kuyavian-Pomeranian Voivodeship, in north-central Poland. It lies approximately 10 kilometres (6 mi) north of Kcynia, 14 km (9 mi) south-west of Nakło nad Notecią, and 39 km (24 mi) west of Bydgoszcz.

Kowalewko is the birthplace of Mieczysław Rakowski, the last First Secretary of the Polish United Workers' Party and former Prime Minister of Poland from 1988 to 1989.