Ernest I, Duke of Saxe-Gotha

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Ernest I
Duke of Saxe-Gotha and Altenburg
Reign	14 April 1672 – 26 March 1675
Successors	Frederick in Saxe-Gotha-Altenburg Albrecht in Saxe-Coburg Bernhard in Saxe-Meiningen Heinrich in Saxe-Römhild Christian in Saxe-Eisenberg Ernst in Saxe-Hildburghausen Johann Ernst in Saxe-Saalfeld
Duke of Saxe-Gotha
Reign	26 February 1640 – 26 March 1675
Predecessor	New creation
Duke of Saxe-Altenburg
Reign	14 April 1672 – 26 March 1675
Predecessor	Friedrich Wilhelm III
Born	(1601-12-25)25 December 1601 Altenburg, Duchy of Saxe-Weimar, Holy Roman Empire
Died	26 March 1675(1675-03-26) (aged 73) Schloss Friedenstein, Gotha, Saxe-Gotha, Holy Roman Empire
Spouse	Elisabeth Sophie of Saxe-Altenburg ​ ​ (m. 1636)​
Issue	Johann Ernest Elisabeth Dorothea, Landgravine of Hesse-Darmstadt Johann Ernest Christian Sophie Johanna Frederick I, Duke of Saxe-Gotha-Altenburg Albert, Duke of Saxe-Coburg Bernhard I, Duke of Saxe-Meiningen Henry, Duke of Saxe-Römhild Christian, Duke of Saxe-Eisenberg Princess Dorothea Maria Ernest, Duke of Saxe-Hildburghausen Johann Philip Johann Ernest IV, Duke of Saxe-Coburg-Saalfeld Johanna Elisabeth Johann Philip Sophie Elisabeth
House	House of Wettin
Father	Johann II, Duke of Saxe-Weimar
Mother	Dorothea Maria of Anhalt
Religion	Lutheran

Ernest I, called "Ernest the Pious" (25 December 1601 – 26 March 1675) was a duke of Saxe-Gotha and Saxe-Altenburg. The duchies were later merged into Saxe-Gotha-Altenburg.

He was the ninth but sixth surviving son of Johann II, Duke of Saxe-Weimar, and Dorothea Maria of Anhalt. His mother was a granddaughter of Christoph, Duke of Württemberg, and great-granddaughter of Ulrich, Duke of Württemberg.