Ostrówek [ɔsˈtruvɛk] is a village in the administrative district of Gmina Karczew, within Otwock County, Masovian Voivodeship, in east-central Poland. It lies approximately 10 kilometres (6 mi) south of Karczew, 14 km (9 mi) south of Otwock, and 30 km (19 mi) south-east of Warsaw.