Kupin [ˈkupin] is a village in the administrative district of Gmina Zalewo, within Iława County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 2 kilometres (1 mi) east of Zalewo, 29 km (18 mi) north of Iława, and 58 km (36 mi) west of the regional capital Olsztyn.