Jamnica [jamˈɲit͡sa] is a village in the administrative district of Gmina Grębów, within Tarnobrzeg County, Subcarpathian Voivodeship, in south-eastern Poland. It lies approximately 4 kilometres (2 mi) north-east of Grębów, 17 km (11 mi) east of Tarnobrzeg, and 62 km (39 mi) north of the regional capital Rzeszów.