Ernest III may refer to:
- Ernest III, Duke of Brunswick-Grubenhagen (1518–1567)
- Ernest III, Duke of Saxe-Hildburghausen (1655–1715)
- Ernest III, Duke of Saxe-Coburg-Saalfeld (1784–1844)
- Ernest Frederick III, Duke of Saxe-Hildburghausen (1727–1780)
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