Rupin [ˈrupin] is a village in the administrative district of Gmina Baranowo, within Ostrołęka County, Masovian Voivodeship, in east-central Poland. It lies approximately 6 kilometres (4 mi) west of Baranowo, 26 km (16 mi) north-west of Ostrołęka, and 107 km (66 mi) north of Warsaw.