Rostki [ˈrɔstki] is a village in the administrative district of Gmina Troszyn, within Ostrołęka County, Masovian Voivodeship, in east-central Poland. It lies approximately 4 kilometres (2 mi) south of Troszyn, 15 km (9 mi) south-east of Ostrołęka, and 101 km (63 mi) north-east of Warsaw.