Marquis of Baux

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Marquis of Baux (French: Marquis des Baux) is a subsidiary title of the prince of Monaco. When possible, the title passes from the reigning prince to the first male heir apparent or heir presumptive of the Monegasque throne.

The present bearer of the title is Hereditary Prince Jacques. The marquisate was associated with the town of Les Baux-de-Provence, but later lost its administrative authority when control of the town reverted to France.

The title of "lord of Baux" had been used by other families previously. King Louis XIII of France re-granted the lordship as a marquisate to Prince Honoré II of Monaco by the Treaty of Péronne on 14 September 1641. The new title was first used by Honoré's only son, Ercole. Ercole died before his father, and thus the title has been granted for several centuries to the heirs of the prince of Monaco.