Ostrów Warcki [ˈɔstruf ˈvart͡ski] is a village in the administrative district of Gmina Warta, within Sieradz County, Łódź Voivodeship, in central Poland. It lies approximately 14 kilometres (9 mi) north of Warta, 25 km (16 mi) north of Sieradz, and 56 km (35 mi) west of the regional capital Łódź.