Ostrówek [ɔsˈtruvɛk] is a village in the administrative district of Gmina Warka, within Grójec County, Masovian Voivodeship, in east-central Poland. It lies approximately 9 kilometres (6 mi) north-east of Warka, 27 km (17 mi) east of Grójec, and 45 km (28 mi) south-east of Warsaw.