Ernest Frederick may refer to:
Ernest Frederick, Margrave of Baden-Durlach (1560–1604) Ernest Frederick I, Duke of Saxe-Hildburghausen (1681–1724) Ernest Frederick II, Duke of Saxe-Hildburghausen (1707–1745) Ernest Frederick, Duke of Saxe-Coburg-Saalfeld (1724–1800) Ernest Frederick III, Duke of Saxe-Hildburghausen (1727–1780) Ernest Frederick, Count Munster or Ernst zu Münster (1766–1839)