Teresin (Polish pronunciation: [tɛˈrɛɕin]) is a village in the administrative district of Gmina Kołbiel, within Otwock County, Masovian Voivodeship, in east-central Poland. It lies approximately 5 kilometres (3 mi) north-east of Kołbiel, 18 km (11 mi) east of Otwock, and 38 km (24 mi) east of Warsaw.