Świętnik (Polish: [ˈɕfjɛntɲik]) is a village in the administrative district of Gmina Lidzbark Warmiński, within Lidzbark County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 4 kilometres (2 mi) south-east of Lidzbark Warmiński and 37 km (23 mi) north of the regional capital Olsztyn.