Troszyn [ˈtrɔʂɨn] is a village in Ostrołęka County, Masovian Voivodeship, in east-central Poland. It is the seat of the gmina (administrative district) called Gmina Troszyn. It lies approximately 13 kilometres (8 mi) east of Ostrołęka and 104 km (65 mi) north-east of Warsaw.