Hajnówka County is a unit of territorial administration and local government (powiat) in Podlaskie Voivodeship, north-eastern Poland, on the border with Belarus. It came into being on January 1, 1999, as a result of the Polish local government reforms passed in 1998. Its administrative seat and largest town is Hajnówka, which lies south-east of the regional capital Bialystok. The only other town in the county is Kleszczele, lying south-west of Hajnówka.