Głuszyn [ˈɡwuʂɨn], is a village in the administrative district of Gmina Krasnopol, within Sejny County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 5 kilometres (3 mi) south-east of Krasnopol, 10 km (6 mi) south-west of Sejny, and 107 km (66 mi) north of the regional capital Białystok.