Gudniki [ɡudˈniki] (German Gudnick) is a village in the administrative district of Gmina Miłakowo, within Ostróda County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 5 kilometres (3 mi) north-west of Miłakowo, 36 km (22 mi) north of Ostróda, and 42 km (26 mi) north-west of the regional capital Olsztyn.