| Duc de Beaumont | |
| Creation Date: | 1765 |
| Creation: | 1st Creation |
| First Holder: | Charles-François-Christian de Montmorency-Luxembourg |
| Last Holder: | Anne Edouard Louis Joseph de Montmorency-Luxembourg |
| Remainder To: | The grantee's heirs males of the body |
| Subsidiary Titles: | Prince de Tingry Comte de Luwe |
| Status: | Extinct |
| Extinction Date: | 1878 |
Duc de Beaumont is an extinct title of nobility in the peerage of France which was created by letters patent in 1765 for French Royal Army officer Charles-François-Christian de Montmorency-Beaumont-Luxembourg.
The lordship of Beaumont-du-Gâtinais in the Île-de-France, was raised to County for Achille de Harlay, a prominent judge and Premier President of the Parlement of Paris. The title went extinct in 1717 with his great-grandson, another Achille de Harlay, but the lands themselves were inherited by the latter's daughter, wife of the Marhall of Montmorency (third son of the Duke of Luxembourg).
The Beaumont title was resurrected as a Dukedom for their son Charles-François-Christian de Montmorency-Luxembourg, a general in the French Army. It was a "simple dukedom", meaning his holder was not a Peer of France. It became extinct on the death of the grantee's grandson Anne-Édouard-Louis-Joseph de Montmorency-Beaumont-Luxembourg, in 1878.