Białowierśnie [bjawɔˈvjɛrɕɲɛ], is a village in the administrative district of Gmina Giby, within Sejny County, Podlaskie Voivodeship, in north-eastern Poland, close to the borders with Belarus and Lithuania. It lies approximately 7 kilometres (4 mi) south-west of Sejny and 106 km (66 mi) north of the regional capital Białystok.