William, Duke of Saxe-Weimar

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Wilhelm
Duke of Saxe-Weimar and Jena
Reign	1620–1662
Predecessor	Johann Ernst I
Successor	Johann Ernst II in Saxe-Weimar Bernhard II in Saxe-Jena
Ruler of Saxe-Eisenach
Reign	1644–1662
Predecessor	Albrecht
Successor	Adolf Wilhelm in Saxe-Eisenach Johann Georg in Saxe-Marksuhl
Born	(1598-04-11)11 April 1598 Altenburg
Died	17 May 1662(1662-05-17) (aged 64) Weimar
Spouse	Eleonore Dorothea of Anhalt-Dessau
Issue	Prince Wilhelm, Hereditary Duke of Saxe-Weimar and Jena Johann Ernst II, Duke of Saxe-Weimar Prince Johann Wilhelm Adolf Wilhelm, Duke of Saxe-Eisenach Johann Georg I, Duke of Saxe-Marksuhl Princess Wilhelmine Eleonore Bernhard II, Duke of Saxe-Jena Prince Frederick Dorothea Marie, Duchess of Saxe-Zeitz
House	House of Wettin
Father	Johann, Duke of Saxe-Weimar
Mother	Dorothea Maria of Anhalt
Religion	Lutheran

Wilhelm, Duke of Saxe-Weimar (Altenburg, 11 April 1598 – Weimar, 17 May 1662), was a duke of Saxe-Weimar.

Wilhelm was the fifth (but third surviving) son of Johann, Duke of Saxe-Weimar, and Dorothea Maria of Anhalt. He was brother to Bernard of Saxe-Weimar, a successful Protestant general in the Thirty Years' War, and to Ernest I, Duke of Saxe-Gotha (later Altenburg), a successful and well-regarded ruler known as "The Pious".