Ruś [ruɕ] (German Reussen) is a village in the administrative district of Gmina Morąg, within Ostróda County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 10 kilometres (6 mi) south of Morąg, 15 km (9 mi) north of Ostróda, and 36 km (22 mi) west of the regional capital Olsztyn.