Bielsk

Bielsk may refer to:


 * Bielsk, Kuyavian-Pomeranian Voivodeship (north-central Poland)
 * Bielsk, Masovian Voivodeship (east-central Poland)
 * Bielsk Podlaski in Podlaskie Voivodeship (north-east Poland)
 * Bielsk, Pomeranian Voivodeship (north Poland)
 * Bielsk County, an administrative district whose seat is Bielsk Podlaski
 * Gmina Bielsk Podlaski, an administrative district within Bielsk County
 * Gmina Bielsk, an administrative district whose seat is Bielsk, Masovian Voivodeship