Osieczek may refer to the following places: Osieczek, Inowrocław County in Kuyavian-Pomeranian Voivodeship (north-central Poland) Osieczek, Wąbrzeźno County in Kuyavian-Pomeranian Voivodeship (north-central Poland) Osieczek, Masovian Voivodeship (east-central Poland) Osieczek, Lubusz Voivodeship (west Poland)