Jewna (Lithuanian: Jaunė, literally, young woman; born c. 1280 in Polatsk – ied c. 1344) was wife of Gediminas, the Grand Duke of Lithuania, Ruthenia and Samogitia (1316–1341). She was daughter of Prince Ivan of Polatsk. She is mentioned only once in the Bychowiec Chronicle, a late and unreliable source. Therefore some historians seriously doubt her existence, but modern reference works still widely cite her as the ancestress of the Gediminids dynasty.