Ostrówek may refer to the following places in Poland:
In Greater Poland Voivodeship (west-central Poland): Ostrówek, Kalisz County Ostrówek, Piła County Ostrówek, Słupca County Ostrówek, Turek County Ostrówek, Gmina Sompolno Ostrówek, Gmina Wierzbinek Ostrówek, Gmina Wilczyn Ostrówek, part of the Śródka district of Poznań, formerly a town in its own right
In Kuyavian-Pomeranian Voivodeship (north-central Poland): Ostrówek, Inowrocław County Ostrówek, Sępólno County
In Łódź Voivodeship (central Poland): Ostrówek, Łęczyca County Ostrówek, Wieluń County Ostrówek, Wieruszów County Ostrówek, Zduńska Wola County
In Lublin Voivodeship (east Poland): Ostrówek, Hrubieszów County Ostrówek, Krasnystaw County Ostrówek, Łęczna County Ostrówek, Lubartów County
In Masovian Voivodeship (east-central Poland): Ostrówek, Grójec County Ostrówek, Otwock County Ostrówek, Siedlce County Ostrówek, Sokołów County Ostrówek, Węgrów County Ostrówek, Wyszków County Ostrówek, Gmina Dąbrówka Ostrówek, Gmina Klembów
In Podlaskie Voivodeship (north-east Poland): Ostrówek, Bielsk County Ostrówek, Gmina Sokółka Ostrówek, Gmina Suchowola Ostrówek, Gmina Szudziałowo
In Subcarpathian Voivodeship (south-east Poland): Ostrówek, Mielec County Ostrówek, Stalowa Wola County
Others Ostrówek, Pomeranian Voivodeship (north Poland) Ostrówek, West Pomeranian Voivodeship (northwest Poland)