Kosmaty Borek [kɔsˈmatɨ ˈbɔrɛk] is a village in the administrative district of Gmina Czarna Białostocka, within Białystok County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 6 kilometres (4 mi) west of Czarna Białostocka and 23 km (14 mi) north of the regional capital Białystok.