Wiercień [ˈvjɛrt͡ɕɛɲ] is a village in the administrative district of Gmina Boćki, within Bielsk County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 4 kilometres (2 mi) north of Boćki, 15 km (9 mi) south-west of Bielsk Podlaski, and 49 km (30 mi) south of the regional capital Białystok.