Kierz [kʲɛʂ] is a village in the administrative district of Gmina Lidzbark Warmiński, within Lidzbark County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 8 kilometres (5 mi) south of Lidzbark Warmiński and 31 km (19 mi) north of the regional capital Olsztyn.