Słucz [swut͡ʂ] is a village in the administrative district of Gmina Radziłów, within Grajewo County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 6 kilometres (4 mi) north-west of Radziłów, 26 km (16 mi) south of Grajewo, and 66 km (41 mi) north-west of the regional capital Białystok.