Klejniki is a village in the administrative district of Gmina Czyże, within Hajnówka County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 8 kilometres (5 mi) north of Czyże, 18 km (11 mi) north-west of Hajnówka, and 34 km (21 mi) south-east of the regional capital Białystok.