Ernst von Sachsen-Altenburg
Ernst von Sachsen-Altenburg designates the following people:
- Ernst I (Saxony-Altenburg) (1826–1908), Duke of Saxony-Altenburg
- Ernst II (Sachsen-Altenburg) (1871–1955), Duke of Sachsen-Altenburg
- Ernst I (Saxe-Gotha-Altenburg) ( the pious ; 1601–1675), Duke of Saxe-Gotha
