Ostrów [ˈɔstruf] is a village in the administrative district of Gmina Celestynów, within Otwock County, Masovian Voivodeship, in east-central Poland. It lies approximately 7 kilometres (4 mi) north of Celestynów, 9 km (6 mi) east of Otwock, and 30 km (19 mi) south-east of Warsaw.