Francis III may refer to:
- Francesco III Ordelaffi (1357–1405)
- Francis III, Duke of Brittany (1518–1536)
- Francesco III Gonzaga, Duke of Mantua (1533–1550)
- Francis I, Holy Roman Emperor, also Francis III, Duke of Lorraine (1708–1765)
- Francesco III d'Este, Duke of Modena (1737–1780)
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