Ostrówek is a name of 31 villages in Poland, including:
* Ostrówek, Inowrocław County in Kuyavian-Pomeranian Voivodeship (north-central Poland)
* Ostrówek, Sępólno County in Kuyavian-Pomeranian Voivodeship (north-central Poland)
* Ostrówek, Hrubieszów County in Lublin Voivodeship (east Poland)
* Ostrówek, Krasnystaw County in Lublin Voivodeship (east Poland)
* Ostrówek, Lubartów County in Lublin Voivodeship (east Poland)
* Ostrówek, Bielsk County in Podlaskie Voivodeship (north-east Poland)
* Ostrówek, Gmina Sokółka in Podlaskie Voivodeship (north-east Poland)
* Ostrówek, Gmina Suchowola in Podlaskie Voivodeship (north-east Poland)
* Ostrówek, Gmina Szudziałowo in Podlaskie Voivodeship (north-east Poland)
* Ostrówek, Łęczyca County in Łódź Voivodeship (central Poland)
* Ostrówek, Wieluń County in Łódź Voivodeship (central Poland)
* Ostrówek, Wieruszów County in Łódź Voivodeship (central Poland)
* Ostrówek, Zduńska Wola County in Łódź Voivodeship (central Poland)
* Ostrówek, Łęczna County in Lublin Voivodeship (east Poland)
* Ostrówek, Mielec County in Subcarpathian Voivodeship (south-east Poland)