Bartki [ˈbartki] is a village in the administrative district of Gmina Kozłowo, within Nidzica County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 8 kilometres (5 mi) east of Kozłowo, 9 km (6 mi) south of Nidzica, and 56 km (35 mi) south of the regional capital Olsztyn.