Dziadyk [ˈd͡ʑadɨk] is a village in the administrative district of Gmina Ostróda, within Ostróda County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 10 kilometres (6 mi) south of Ostróda and 39 km (24 mi) south-west of the regional capital Olsztyn.