The Duchy of Saxe-Jena was one of the Saxon Duchies 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 on the extinction of Bernhard's line in 1690.
Dukes of Saxe-Jena Bernhard II (1672–1678) Johann Wilhelm (1678–1690) Reincorporated into Saxe-Weimar.
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