Rudnia may refer to the following places:
Poland[edit]
- Rudnia, Gmina Czarna Białostocka in Podlaskie Voivodeship, north-east Poland
- Rudnia, Gmina Michałowo in Podlaskie Voivodeship, north-east Poland
- Rudnia, Warmian-Masurian Voivodeship, north Poland
- Rudnia River, a tributary in Poland of the Narew
Lithuania[edit]
- Rudnia (Kaniava), a village in Kaniava eldership, Varėna district municipality, Alytus County
Ukraine[edit]
- Verkhnia Rudnia, Zhytomyr Oblast