Ostrowik may refer to the following places: Ostrowik, Podlaskie Voivodeship (north-east Poland) Ostrowik, Otwock County in Masovian Voivodeship (east-central Poland) Ostrowik, Wołomin County in Masovian Voivodeship (east-central Poland) Ostrówik, Masovian Voivodeship (east-central Poland)