Ustrzesz [ˈustʂɛʂ] is a village in the administrative district of Gmina Radzyń Podlaski, within Radzyń Podlaski County, Lublin Voivodeship, in eastern Poland. It lies approximately 6 kilometres (4 mi) east of Radzyń Podlaski and 62 km (39 mi) north of the regional capital Lublin.