Ostrów [ˈɔstruf] is a village in the administrative district of Gmina Brzeźnio, within Sieradz County, Łódź Voivodeship, in central Poland. It lies approximately 4 kilometres (2 mi) west of Brzeźnio, 17 km (11 mi) south-west of Sieradz, and 70 km (43 mi) south-west of the regional capital Łódź.