Ciernie [ˈt͡ɕɛrɲɛ] is a village in the administrative district of Gmina Prostki, within Ełk County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 10 kilometres (6 mi) west of Prostki, 17 km (11 mi) south of Ełk, and 119 km (74 mi) east of the regional capital Olsztyn.