Hajnówka is a town and a powiat seat in north-eastern Poland with 21,442 inhabitants (2014). It is the capital of Hajnówka County. The town is also notable for its proximity to the Białowieża Forest, the biggest primaeval forest in Europe. Through Hajnówka flows the river Leśna Prawa. It is one of the centres of Orthodox faith and a notable centre of Belarusian culture in Poland.
Belarusians comprised 26.4% of the town's population in 2002.