The title of Duc de Mouchy was a French peerage held by members of a cadet branch of the Noailles family.
The founder of the branch, Philippe, comte de Noailles (1715-1794), was the younger brother of Louis, 4th duc de Noailles and a marshal of France. He received the Spanish title of prince de Poix in 1729, and that of duc de Mouchy (also a Spanish title) in 1747, when on the birth of his first son the title of prince de Poix became a courtesy title held by the heir. In 1767 Philippe de Noailles received the additional French title of duc de Poix à brevêt.
Three of Noailles's sons died as infants, the last before the birth of the duke's successor, Philippe-Louis-Marc-Antoine de Noailles, who was thus prince de Poix from his birth. On his father's death, he became prince-duc de Poix and the Spanish duc de Mouchy. In 1817, during the Restoration, he was created duc de Mouchy as a French peerage. From that point, the head of the male line has been duc de Mouchy and prince-duc de Poix.
Ducs de Mouchy (1817)
From the creation of the French peerage, the holders have been:
The heir-apparent is Antoine-Georges-Marie de Noailles, prince de Poix (b. 1950).
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