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Ernst I, Duke of Saxe-Coburg-Saalfeld, later Duke of Saxe-Coburg-Gotha, (January 2, 1784-January 29, 1844) was the son of Duke Francis Frederick of Saxe-Coburg-Saalfield (1750-1806) and Countess Auguste Reuss zu Ebersdorf und Lobenstein (1757-1831).
On 31 Jul 1817 at Gotha he married Ernst II, Duke of Saxe-Coburg-Gotha (1818-1893)