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| William Ernest | |
|---|---|
 | |
| Duke of Saxe-Weimar | |
| Reign | 1683–1728 |
| Predecessor | Johann Ernst II |
| Successor | Ernst August I |
| Born | 19 October 1662 Weimar |
| Died | 26 August 1728 (aged 65) Weimar |
| Spouse | Charlotte Marie of Saxe-Jena |
| House | House of Wettin |
| Father | Johann Ernst II, Duke of Saxe-Weimar |
| Mother | Princess Christine Elisabeth of Schleswig-Holstein-Sonderburg |
| Religion | Lutheran |
William Ernest, Duke of Saxe-Weimar (19 October 1662 – 26 August 1728) was a duke of Saxe-Weimar.