Słójka [ˈswui̯ka] is a village in the administrative district of Gmina Szudziałowo, within Sokółka County, Podlaskie Voivodeship, in north-eastern Poland, close to the border with Belarus. It lies approximately 4 kilometres (2 mi) west of Szudziałowo, 14 km (9 mi) south-east of Sokółka, and 37 km (23 mi) north-east of the regional capital Białystok.