Ostrówek [ɔsˈtruvɛk] is a village in the administrative district of Gmina Orchowo, within Słupca County, Greater Poland Voivodeship, in west-central Poland. It lies approximately 3 kilometres (2 mi) north-west of Orchowo, 28 km (17 mi) north of Słupca, and 74 km (46 mi) east of the regional capital Poznań.