Prusak [ˈprusak] is a village in the administrative district of Gmina Sokolniki, within Wieruszów County, Łódź Voivodeship, in central Poland. It lies approximately 3 kilometres (2 mi) north-east of Sokolniki, 16 km (10 mi) east of Wieruszów, and 93 km (58 mi) south-west of the regional capital Łódź.