Louis, Duke of Brittany
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Louis, Duke of Brittany, or variations on this name, may refer to:
- Louis XII of France (1462-1515), who by marriage to Anne, Duchess of Brittany, was Duke of Brittany
- Louis, Duke of Brittany (1704-1705), the eldest son of Louis, Dauphin of France (1682-1712) and Princess Marie-Adélaïde of Savoy
- Louis, Dauphin of France (1707-1712), brother of the above, who also held the title Duke of Brittany