Nienaszów [ɲɛˈnaʂuf] is a village in the administrative district of Gmina Nowy Żmigród, within Jasło County, Subcarpathian Voivodeship, in south-eastern Poland. It lies approximately 5 kilometres (3 mi) north-east of Nowy Żmigród, 16 km (10 mi) south-east of Jasło, and 54 km (34 mi) south-west of the regional capital Rzeszów.