Kościuki [kɔɕˈt͡ɕuki] is a village in the administrative district of Gmina Choroszcz, within Białystok County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 5 kilometres (3 mi) south-west of Choroszcz and 15 km (9 mi) west of the regional capital Białystok.