Marusy [maˈrusɨ] is a village in the administrative district of Gmina Sońsk, within Ciechanów County, Masovian Voivodeship, in east-central Poland. It lies approximately 2 kilometres (1 mi) east of Sońsk, 12 km (7 mi) south-east of Ciechanów, and 66 km (41 mi) north of Warsaw.