Ernest I
# Ernest I

Ernest I or Ernst I can refer to:

* Ernest I, Duke of Swabia (reigned 1012–15)
* Ernest I, Prince of Anhalt-Dessau (died 1516)
* Ernest I, Duke of Brunswick-Lüneburg (1497–1546), Ernest the Confessor
* Ernst I, Duke of Saxe-Coburg-Altenburg (1601–1675), Ernest the Pious
* Ernst I, Duke of Saxe-Coburg and Gotha (1784–1844), father of Prince Albert, the consort of Queen Victoria
* Ernst I, Prince of Hohenlohe-Langenburg (1794–1860)
