Grabnik [ˈɡrabnik] is a village in the administrative district of Gmina Mikołajki, within Mrągowo County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 7 kilometres (4 mi) north-east of Mikołajki, 24 km (15 mi) east of Mrągowo, and 77 km (48 mi) east of the regional capital Olsztyn.