Ernest Augustus I
Duke of Saxe-Weimar
Reign	1707–1748
Predecessor	Wilhelm Ernst with John Ernst III
Successor	Ernest Augustus II
Co-ruler	Wilhelm Ernst
Duke of Saxe-Eisenach
Reign	1741–1748
Predecessor	Wilhelm Heinrich
Successor	Ernest Augustus II
Born	(1688-04-19)19 April 1688 Weimar
Died	19 January 1748(1748-01-19) (aged 59) Eisenach
Spouse	Eleonore Wilhelmine of Anhalt-Köthen Sophie Charlotte of Brandenburg-Bayreuth
Issue	Wilhelm Ernst, Hereditary Prince of Saxe-Weimar Princess Wilhelmine Auguste Johann Wilhelm, Hereditary Prince of Saxe-Weimar Princess Charlotte Agnes Leopoldina Princess Johanna Eleonore Henriette Ernestine Albertine, Countess of Lippe-Alverdissen Bernhardina, Princess of Schwarzburg-Rudolstadt Prince Emmanuel Frederick Karl August Eugen, Hereditary Prince of Saxe-Weimar Ernest Augustus II, Duke of Saxe-Weimar-Eisenach Princess Eleonore Christiane Princess Johanna Auguste Ernestine, Duchess of Saxe-Hildburghausen Prince Ernst Adolf
House	House of Saxe-Weimar-Eisenach
Father	Johann Ernst III, Duke of Saxe-Weimar
Mother	Sophie Auguste of Anhalt-Zerbst
Religion	Lutheranism

Ernest Augustus I, Duke of Saxe-Weimar (German: Ernst August I; 19 April 1688 – 19 January 1748) was a duke of Saxe-Weimar. In 1741, he became the duke of Saxe-Weimar-Eisenach.

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