Smolany Dąb, is a village in the administrative district of Gmina Krasnopol, within Sejny County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 2 kilometres (1 mi) south of Krasnopol, 10 km (6 mi) west of Sejny, and 110 km (68 mi) north of the regional capital Białystok.