The Duchy of Saxe-Jena was one of the

Saxon Duchies The Ernestine duchies (), also known as the Saxon duchies (, although the Albertine appanage duchies of Weissenfels, Merseburg and Zeitz were also "Saxon duchies" and adjacent to several Ernestine ones), were a group of small states whose numb ...

held by the Ernestine line of the Wettin Dynasty. Established in 1672 for Bernhard, fourth son of Wilhelm, Duke of Saxe-Weimar, Saxe-Jena was reincorporated into

Saxe-Weimar Saxe-Weimar (german: Sachsen-Weimar) was one of the Saxon duchies held by the Ernestine branch of the Wettin dynasty in present-day Thuringia. The chief town and capital was Weimar. The Weimar branch was the most genealogically senior extant bra ...

on the extinction of Bernhard's line in 1690.

Dukes of Saxe-Jena

* Bernhard (1672–1678) * Johann Wilhelm (1678–1690) ''Reincorporated into

'' {{Coord missing, Thuringia 1672 establishments in the Holy Roman Empire 1690 disestablishments in the Holy Roman Empire States and territories established in 1672 Jena