Brzostówka [bʐɔsˈtufka] is a village in the administrative district of Gmina Serniki, within Lubartów County, Lublin Voivodeship, in eastern Poland. It lies approximately 9 kilometres (6 mi) east of Serniki, 14 km (9 mi) east of Lubartów, and 26 km (16 mi) north-east of the regional capital Lublin.