Johann Wilhelm, Duke of Saxe-Jena

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Johann Wilhelm, Duke of Saxe-Jena (b. Jena, 28 March 1675 - d. Jena, 4 November 1690), was a duke of Saxe-Jena.

He was the youngest but only surviving son of Bernhard II, Duke of Saxe-Jena and Marie Charlotte de la Trémoille.

With only three years old (1678) he succeeded his father as duke of Saxe-Jena. In accordance with the testamentary instructions of its father, his uncle, the duke Johann Ernst II of Saxe-Weimar assumed his guardianship and the regency of the duchy; when he died in 1683, his next uncle, the duke Johann Georg I of Saxe-Eisenach, assumed the regency. Three years later (1686), the new regent also died, and the regency was appointed to the duke Wilhelm Ernst of Saxe-Weimar, his cousin (son of the late duke Johann Ernst II) and brother-in-law (he was married with his eldest and only surviving sister, Charlotte Marie).

Johann Wilhelm with only fifteen years and before reaching adulthood, for this, he never governed. With his death the line of the dukes of Saxe-Jena had become extinct, and the duchy was divided between Saxe-Weimar and Saxe-Eisenach.

Preceded by Bernhard II

Duke of Saxe-Jena 1678–1690

Succeeded by Duchy divided between Saxe-Weimar and Saxe-Eisenach