Żardeniki [ʐardɛˈniki] is a village in the administrative district of Gmina Jeziorany, within Olsztyn County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 5 kilometres (3 mi) east of Jeziorany and 30 km (19 mi) north-east of the regional capital Olsztyn.

Before 1772 the area was part of Kingdom of Poland, and in 1772–1945 it belonged to Prussia and Germany (East Prussia).