Zieleniec may refer to: * Josef Zieleniec, a Czech Member of the European Parliament and the following places in Poland: * Zieleniec, a district of the town of Duszniki-Zdrój * Zieleniec, a district of the town of Gorzów Wielkopolski * Zieleniec, Kuyavian-Pomeranian Voivodeship (north-central Poland) * Zieleniec, Łódź Voivodeship (central Poland) * Zieleniec, Lublin Voivodeship (east Poland) * Zieleniec, Gostynin County in Masovian Voivodeship (east-central Poland) * Zieleniec, Kozienice County in Masovian Voivodeship (east-central Poland) * Zieleniec, Węgrów County in Masovian Voivodeship (east-central Poland) * Zieleniec, Greater Poland Voivodeship (west-central Poland) * Zieleniec, Lubusz Voivodeship (west Poland) * Zieleniec, Opole Voivodeship (south-west Poland) * Zieleni