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, Lithuania

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