Ulnowo [ulˈnɔvɔ] is a village in the administrative district of Gmina Grunwald, within Ostróda County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 30 kilometres (19 mi) south-east of Ostróda and 42 km (26 mi) south-west of the regional capital Olsztyn.