Trześń [tʂɛɕɲ] is a village in the administrative district of Gmina Niwiska, within Kolbuszowa County, Subcarpathian Voivodeship, in south-eastern Poland. It lies approximately 5 kilometres (3 mi) east of Niwiska, 9 km (6 mi) south-west of Kolbuszowa, and 32 km (20 mi) north-west of the regional capital Rzeszów.