Bielsk County (Polish: powiat bielski) is a unit of territorial administration and local government (powiat) in Podlaskie Voivodeship, north-eastern Poland. It came into being on 1 January 1999, as a result of the Polish local government reforms passed in 1998. Its administrative seat and largest town is Bielsk Podlaski, which lies 39 kilometres (24 mi) south of the regional capital Białystok. The only other town in the county is Brańsk, lying 25 km (16 mi) west of Bielsk Podlaski.
The county covers an area of 1,385.2 square kilometres (534.8 sq mi). As of 2019 its total population is 54,590, out of which the population of Bielsk Podlaski is 25,290, that of Brańsk is 3,767, and the rural population is 25,533.[1]
On 18 January 1493, Brańsk received a city charter based on Magdeburg rights from the Grand Duke of Lithuania, Alexander Jagiellon. It was the first city in Podlaskie to receive such a charter.
On 5 November 1916, a declaration by the German Empire and the Austro-Hungarian Empire, promised the creation of the Kingdom of Poland in the areas of Poland controlled by the German Empire, including Bielsk County.