Brzostek [ˈbʐɔstɛk] is a village in the administrative district of Gmina Zaniemyśl, within Środa Wielkopolska County, Greater Poland Voivodeship, in west-central Poland. It lies approximately 4 kilometres (2 mi) north-east of Zaniemyśl, 8 km (5 mi) south-west of Środa Wielkopolska, and 32 km (20 mi) south-east of the regional capital Poznań.