Ernst III.
Ernst III. means the following persons:
- Ernst III. (Braunschweig-Grubenhagen) (1518–1567), Duke of Braunschweig-Grubenhagen
- Ernst III. von Habsburg (1553–1595), governor of Lower Austria, see Ernst von Österreich (1553–1595)
- Ernst III. von Sachsen-Coburg-Saalfeld (1784–1844), Duke of Sachsen-Coburg-Saalfeld, see Ernst I. (Sachsen-Coburg and Gotha)