Ernest I (German: Ernst Anton Karl Ludwig; 2 January 1784 – 29 January 1844) was the last sovereign duke of Saxe-Coburg-Saalfeld (as Ernest III) and, from 1826, the first sovereign duke of Saxe-Coburg and Gotha (as Ernest I). He was the father of Albert, Prince Consort, who was the husband of Queen Victoria.
Ernest Louis was the elder son of Louis IV, Grand Duke of Hesse and by Rhine and Princess Alice of the United Kingdom, daughter of Queen Victoria and Prince Albert of Saxe-Coburg and Gotha. He was named Louis after his father. His nickname was "Ernie".