Piasek [ˈpʲasɛk] is a village in the administrative district of Gmina Grębów, within Tarnobrzeg County, Subcarpathian Voivodeship, in south-eastern Poland. It lies approximately 2 kilometres (1 mi) east of Grębów, 15 km (9 mi) east of Tarnobrzeg, and 61 km (38 mi) north of the regional capital Rzeszów.