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| Johann Wilhelm | |
|---|---|
| Duke of Saxe-Jena | |
| Reign | 1678–1690 |
| Predecessor | Bernhard II |
| Successor | Duchy divided between Saxe-Weimar and Saxe-Eisenach |
| Born | 28 March 1675 Jena |
| Died | 4 November 1690 (aged 15) Jena |
| House | House of Wettin |
| Father | Bernhard II, Duke of Saxe-Jena |
| Mother | Marie Charlotte de la Trémoille |
| Religion | Lutheran |
Johann Wilhelm, Duke of Saxe-Jena (28 March 1675 in Jena – 4 November 1690 in Jena), was a duke of Saxe-Jena.
He was the youngest but sole surviving son of Bernhard II, Duke of Saxe-Jena by his wife Marie Charlotte, daughter of Henry de La Trémoille, 3rd Duke of Thouars, 2nd Duke of La Tremoille, and Prince of Talmond and Taranto.