Dunajek [duˈnajɛk] is a village in the administrative district of Gmina Gołdap, within Gołdap County, Warmian-Masurian Voivodeship, in northern Poland, close to the border with the Kaliningrad Oblast of Russia. It lies approximately 16 kilometres (10 mi) south of Gołdap and 123 km (76 mi) east of the regional capital Olsztyn.