Ostrówek [ɔsˈtruvɛk] is a village in the administrative district of Gmina Wyrzysk, within Piła County, Greater Poland Voivodeship, in west-central Poland. It lies approximately 6 kilometres (4 mi) south-east of Wyrzysk, 41 km (25 mi) east of Piła, and 86 km (53 mi) north of the regional capital Poznań.