Ostre Bardo [ˈɔstrɛ ˈbardɔ] (German: Klingenberg) is a village in the administrative district of Gmina Sępopol, within Bartoszyce County, Warmian-Masurian Voivodeship, in northern Poland, close to the border with the Kaliningrad Oblast of Russia. It lies approximately 10 kilometres (6 mi) north of Sępopol, 17 km (11 mi) north-east of Bartoszyce, and 71 km (44 mi) north-east of the regional capital Olsztyn.
Before 1945 the area was part of Germany (East Prussia). Following World War II the native German populace was expelled and replaced by Poles.
Coordinates: 54°20′41″N 20°59′17″E / 54.3447°N 20.9881°E