 Frederick, Duke of Saxe-Altenburg

Frederick, Duke of Saxe-Hildburghausen (29 April 1763 in Hildburghausen – 29 September 1834 in Jagdhaus Hummelshain, Altenburg), was duke of Saxe-Hildburghausen (1780–1826) and duke of Saxe-Altenburg (1826–1834).He was the youngest child, but only son, of Ernst Frederick III, Duke of Saxe-Hildburghausen, by his third wife, Princess Ernestine of Saxe-Weimar.