Rudnik may refer to:
- Rudnik (mountain), a mountain in central Serbia
- Rudnik (Gornji Milanovac), a small town in the municipality of Gornji Milanovac, Serbia
- Rudnik, Greater Poland Voivodeship (west Poland)
- Rudnik, Gmina Dobczyce in Lesser Poland Voivodeship (south Poland)
- Rudnik, Gmina Sułkowice in Lesser Poland Voivodeship (south Poland)
- Rudnik, Łódź Voivodeship (central Poland)
- Rudnik, Gmina Rudnik in Lublin Voivodeship (east Poland)
- Rudnik, Lublin County in Lublin Voivodeship (east Poland)
- Rudnik, now part of Kąkolewnica, in Radzyń Podlaski County, Lublin Voivodeship
- Rudnik, Łosice County in Masovian Voivodeship (central Poland)
- Rudnik, Mińsk County in Masovian Voivodeship (central Poland)
- Rudnik, Otwock County in Masovian Voivodeship (central Poland)
- Rudnik, Cieszyn County in Silesian Voivodeship (south Poland)
- Rudnik, Racibórz County in Silesian Voivodeship (south Poland)
- Rudnik, Starachowice County in Świętokrzyskie Voivodeship (south-central Poland)
- Rudnik, Włoszczowa County in Świętokrzyskie Voivodeship (south-central Poland)
- Rudnik, Szczecin in Subcarpathian Voivodeship (south-east Poland)
- Rudnik, Kraśnik County in Lublin Voivodeship (south-east Poland)
- Rudnik (Ilidža – Sarajevo), a village in Bosnia and Herzegovina
- Rudnik, Ljubljana, a part of Ljubljana, Slovenia
- Rudnik, Kosovo, a village near Srbica
- Rudnik (surname)
- Rudnik pri Moravčah, a village near Moravče, Slovenia
- Rudnik pri Radomljah, a village near Kamnik, Slovenia
- Rudnik nad Sanem, a town in Subcarpathian Voivodeship
- Rudnik Szlachecki, a village in Lublin Voivodeship
- Senjski Rudnik, a village in Serbia