Rudnia may refer to the following places:
Poland 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 Rudnia (Kaniava), a village in Kaniava eldership, Varėna district municipality, Alytus County
Ukraine
Verkhnia Rudnia, Zhytomyr Oblast
See also Rudnya (disambiguation)