Brzostki [ˈbʐɔstki] is a village in the administrative district of Gmina Pieniężno, within Braniewo County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 5 kilometres (3 mi) north-west of Pieniężno, 22 km (14 mi) south-east of Braniewo, and 58 km (36 mi) north-west of the regional capital Olsztyn.