Nieborzyn [ɲɛˈbɔʐɨn] is a village in the administrative district of Gmina Grudusk, within Ciechanów County, Masovian Voivodeship, in east-central Poland. It lies approximately 9 kilometres (6 mi) south of Grudusk, 14 km (9 mi) north of Ciechanów, and 88 km (55 mi) north of Warsaw.