Teresin (Polish pronunciation: [tɛˈrɛɕin]) is a village in Sochaczew County, Masovian Voivodeship, in east-central Poland. It is the seat of the gmina (administrative district) called Gmina Teresin. It lies approximately 13 kilometres (8 mi) east of Sochaczew and 40 km (25 mi) west of Warsaw.