Gostomia [ɡɔsˈtɔmja] is a village in the administrative district of Gmina Nowe Miasto nad Pilicą, within Grójec County, Masovian Voivodeship, in east-central Poland. It lies approximately 6 kilometres (4 mi) east of Nowe Miasto nad Pilicą, 30 km (19 mi) south-west of Grójec, and 70 km (43 mi) south of Warsaw.