Gmina Niwiska is a rural gmina (administrative district) in Kolbuszowa County, Subcarpathian Voivodeship, in south-eastern Poland. Its seat is the village of Niwiska, which lies approximately 12 kilometres (7 mi) west of Kolbuszowa and 36 km (22 mi) north-west of the regional capital Rzeszów.

The gmina covers an area of 95.192 square kilometres (36.75 sq mi), and as of 2006 its total population is 5,780.

Gmina Niwiska contains the villages and settlements of Hucina, Hucisko, Kosowy, Leszcze, Niwiska, Przyłęk, Siedlanka, Trześń and Zapole.

Gmina Niwiska is bordered by the gminas of Cmolas, Kolbuszowa, Mielec, Ostrów, Przecław and Sędziszów Małopolski.

• Polish official population figures 2006