Pieńsk [pʲɛɲsk] (German: Penzig) is a town in Zgorzelec County, Lower Silesian Voivodeship, in south-western Poland. It is the seat of the administrative district (gmina) called Gmina Pieńsk, and stands on the east bank of the Lusatian Neisse river, which forms the border between Poland and Germany. (For more information about the history of the region, see Lusatia.)