Klucznik [ˈklut͡ʂɲik] is a village in the administrative district of Gmina Barczewo, within Olsztyn County, Warmian-Masurian Voivodeship, in northern Poland.

[1] It lies approximately 11 kilometres (7 mi) south-east of Barczewo and 19 km (12 mi) east of the regional capital Olsztyn.

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