Radziucie [raˈd͡ʑut͡ɕɛ] is a village in the administrative district of Gmina Sejny, within Sejny County, Podlaskie Voivodeship, in north-eastern Poland, close to the border with Lithuania. It lies approximately 9 kilometres (6 mi) north-east of Sejny and 120 km (75 mi) north of the regional capital Białystok.