Adamowo-Zastawa [adaˈmɔvɔ zasˈtava] is a village in the administrative district of Gmina Mielnik, within Siemiatycze County, Podlaskie Voivodeship, in north-eastern Poland, close to the border with Belarus. It lies approximately 6 kilometres (4 mi) north-east of Mielnik, 19 km (12 mi) east of Siemiatycze, and 84 km (52 mi) south of the regional capital Białystok. Through the village runs Voivodeship road 640 as well as Druzhba pipeline.