Koszelówka [kɔʂɛˈlufka] is a village in the administrative district of Gmina Łąck, within Płock County, Masovian Voivodeship, in east-central Poland. It lies approximately 8 kilometres (5 mi) south-east of Łąck, 13 km (8 mi) south of Płock, and 91 km (57 mi) west of Warsaw. It lies on the shore of Zdworskie Lake.