Zastocze [zasˈtɔt͡ʂɛ] is a village in the administrative district of Gmina Krypno, within Mońki County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 5 kilometres (3 mi) north of Krypno, 10 km (6 mi) south of Mońki, and 31 km (19 mi) north-west of the regional capital Białystok.