Ostałówek [ɔstaˈwuvɛk] is a village in the administrative district of Gmina Chlewiska, within Szydłowiec County, Masovian Voivodeship, in east-central Poland. It lies approximately 8 kilometres (5 mi) north-east of Chlewiska, 8 km (5 mi) north of Szydłowiec, and 103 km (64 mi) south of Warsaw.