'young man'; Christian name: Ioann; also John or Ivan; c. 1300 – after 1366) was Grand Duke of Lithuania after his father Gediminas died in 1341 until he was deposed by his elder brothers Algirdas and Kęstutis in 1345.

Some suggested that he was an acceptable compromise between pagan (Algirdas and Kęstutis) and Orthodox (Narimantas, Karijotas, Liubartas) sons of Gediminas.

[3] His brothers were much more active: Algirdas attacked Mozhaysk, Livonian Order, defended Pskov, Kęstutis was helping Liubartas in succession disputes in Galicia–Volhynia.

[4] The Bychowiec Chronicle mentions that Jaunutis was supported by Jaunė, the presumed wife of Gediminas and mother of his children.

[5] Jaunutis was supported by his brother Narimantas, who traveled to Jani Beg, Khan of the Golden Horde, to form an alliance against Algirdas and Kęstutis.

There Jaunutis was baptized as Ioann, but failed to solicit help (possibly because his sister Aigusta, wife of Simeon, died the same year).