Gruszczyn [ˈɡruʂt͡ʂɨn] is a village in the administrative district of Gmina Magnuszew, within Kozienice County, Masovian Voivodeship, in east-central Poland. It lies approximately 8 kilometres (5 mi) north-west of Magnuszew, 31 km (19 mi) north-west of Kozienice, and 50 km (31 mi) south-east of Warsaw.