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| John Ernest III | |
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| Duke of Saxe-Weimar | |
| Reign | 1683–1707 |
| Predecessor | Johann Ernst II |
| Successor | Ernst August I |
| Born | 22 June 1664 Weimar |
| Died | 10 May 1707 (aged 42) Weimar |
| Spouse | Sophie Auguste of Anhalt-Zerbst Charlotte Dorothea Sophia of Hesse-Homburg |
| Issue | Prince Johann Wilhelm, Hereditary Duke of Saxe-Weimar Ernst August I Princess Eleonore Christiane Princess Johanna Auguste Princess Johanna Charlotte Prince Karl Frederick Prince Johann Ernst Princess Marie Luise Princess Christiane Sophie |
| House | House of Wettin |
| Father | Johann Ernst II, Duke of Saxe-Weimar |
| Mother | Christine Elisabeth of Schleswig-Holstein-Sonderburg |
| Religion | Lutheran |
John Ernest III (22 June 1664 in Weimar – 10 May 1707 in Weimar), was a duke of Saxe-Weimar.