William, Duke of Saxe-Weimar
| Wilhelm | |
|---|---|
Engraving by Peter Isselburg, 1624 | |
| Duke of Saxe-Weimar and Duke of Saxe-Jena | |
| Reign | 1620–1662 |
| Predecessor | John Ernest I |
| Successor | John Ernest II in Saxe-Weimar Bernhard II in Saxe-Jena |
| Ruler of Saxe-Eisenach | |
| Reign | 1644–1662 |
| Predecessor | Albrecht |
| Successor | Adolf William in Saxe-Eisenach John George I in Saxe-Marksuhl |
| Born | 11 April 1598 Altenburg |
| Died | 17 May 1662 (aged 64) Weimar |
| Spouse | |
| Issue Detail |
|
| House | Wettin (Ernestine line) |
| Father | Johann II, Duke of Saxe-Weimar |
| Mother | Dorothea Maria of Anhalt |
| Religion | Lutheranism |
William, Duke of Saxe-Weimar (German: Wilhelm von Sachsen-Weimar; 11 April 1598 – 17 May 1662) was a duke of Saxe-Weimar. He was the fifth child, but the third surviving son of Johann II, Duke of Saxe-Weimar, and Dorothea Maria of Anhalt. He was the brother of Bernard of Saxe-Weimar, a prominent Protestant military leader during the Thirty Years' War, and of Ernest I, Duke of Saxe-Gotha-Altenburg, later known as "The Pious".