Brzóstków [ˈbʐustkuf] is a village in the administrative district of Gmina Żerków, within Jarocin County, Greater Poland Voivodeship, in west-central Poland. It lies approximately 4 kilometres (2 mi) north of Żerków, 16 km (10 mi) north of Jarocin, and 57 km (35 mi) south-east of the regional capital Poznań.