Piastów [ˈpjastuf] is a village in the administrative district of Gmina Żelechów, within Garwolin County, Masovian Voivodeship, in east-central Poland. It lies approximately 8 kilometres (5 mi) west of Żelechów, 15 km (9 mi) south-east of Garwolin, and 71 km (44 mi) south-east of Warsaw.