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The title of 'Duke of Montmorency' was created several times for members of the Montmorency family, who were lords of Montmorency, near Paris.
The first creation was in 1551 for Anne of Montmorency, Constable of France. This title was forfeited by the fourth Duke, who was executed for treason in 1632.
The duchy was then recreated in 1633 for his sister Charlotte Marguerite of Montmorency and her husband the Prince of Condé. This title was renamed Duke of Enghien in 1689.
The original Duke of Montmorency title was transferred to the duchy of Beaufort, which had been conferred on Charles François Frederic of Montmorency-Luxembourg, Prince de Tingry, in 1688. This latter title was authorised to pass through the female line to the branch of Montmorency-Fosseux in 1767 and became extinct in 1862.
However, in 1864 the Emperor Napoleon III extended the title of Duke of Montmorency to the Duke of Valençay, second son of the Duke of Talleyrand by his wife Anne Louise Charlotte of Montmorency, who was a sister of the 6th Duke of Montmorency. His male issue became extinct in 1951, when the Dukedom of Montmorency again became extinct.
==Dukes de Montmorency - first creation (1551)==

★ 1. 1551-1567 : Anne, Duke of Montmorency (1493–1567)

★ 2. 1567-1579 : Francis, Duke of Montmorency (1530-1579), son of

★ 3. 1579-1614 : Henry I, Duke of Montmorency (1534-1614), son of

★ 4. 1614-1632 : Henry II, Duke of Montmorency (1595-1632), son of
The title was forfitted by the last duke upon execution, and returned to the royal domain.
==Dukes of Montmorency - second creation (1633)==

★ 1. 1633-1646 : Henry I, Duke of Montmorency (1588-1646), brother-in-law

★ 2. 1646-1686 : Louis, Duke of Montmorency (1643-1686), son of

★ 3. 1686-1689 : Henry II, Duke of Montmorency (1643-1709), son of
The title of Duke of Montmorency was changed to Duke of Enghien in 1689.

★ 1. 1689-1709 : Henri I, Duke of Enghien (1643-1709)

★ 2. 1709-1710 : Louis I, Duke of Enghien (1668-1710)

★ 3. 1710-1740 : Louis II Henri, Duke of Enghien (1692-1740)

★ 4. 1740-1818 : Louis III Joseph, Duke of Enghien (1736-1818)

★ 5. 1818-1830 : Louis IV Henri, Duke of Enghien (1756-1830)
On the death of the last duke in 1830, the title passed to Louis Philippe III, Duke of Orléans, a great-great-grandson of the Louis I, Duke of Enghien through the female line. He had become King of the French as Louis Philippe I a month earlier.
==Dukes of Montmorency - third creation (1689)==
The title of Duke of Beaufort was changed to Duke of Montmorency in 1689.

★ 1. 1688-1726 : Charles I, Duke of Montmorency (1662-1726), son of

★ 2. 1726-1730 : Charles II, Duke of Montmorency (1702-1764), son of

★ 3. 1730-1761 : Anne I Francis, Duke of Montmorency (1735-1761), son of

★ 4. 1761-1799 : Charlotte, Duchess of Montmorency (1752-1829), daughter of, married 1767

★ 4. 1767-1799 : Anne II Leon, Duke of Montmorency (1731-1799)

★ 5. 1799-1846 : Anne III Charles, Duke of Montmorency (1768-1846), son of

★ 6. 1846-1862 : Anne IV Louis, Duke of Montmorency (1790-1862), son of

★ 7. 1864-1915 : Nicolas, Duke of Montmorency (1837-1915), nephew of, title extended to him and his issue in 1864

★ 8. 1915-1951 : Napoleon, Duke of Montmorency (1867-1951)
On the death of the last duke in 1951, the title became extint.