Pieńków [ˈpjɛɲkuf] is a village in the administrative district of Gmina Czosnów, within Nowy Dwór County, Masovian Voivodeship, in east-central Poland. It lies approximately 7 kilometres (4 mi) east of Czosnów, 12 km (7 mi) southeast of Nowy Dwór Mazowiecki, and 21 km (13 mi) northwest of Warsaw.