Szostaki [ʂɔsˈtaki] is a village in the administrative district of Gmina Sidra, within Sokółka County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 6 kilometres (4 mi) north of Sidra, 23 km (14 mi) north of Sokółka, and 57 km (35 mi) north of the regional capital Białystok.