Pniewiski [pɲɛˈviski] is a village in the administrative district of Gmina Przesmyki, within Siedlce County, Masovian Voivodeship, in east-central Poland. It lies approximately 5 kilometres (3 mi) north-west of Przesmyki, 25 km (16 mi) north-east of Siedlce, and 107 km (66 mi) east of Warsaw.