Poluńce is a village in the administrative district of Gmina Puńsk, within Sejny County, Podlaskie Voivodeship, in north-eastern Poland, close to the border with Lithuania. It lies approximately 9 kilometres (6 mi) east of Puńsk, 16 km (10 mi) north of Sejny, and 127 km (79 mi) north of the regional capital Białystok.