Antonin Nompar de Caumont, 1st Duke of Lauzun

Antonin Nompar de Caumont, 1st Duke of Lauzun (French pronunciation: [ɑ̃twan nɔ̃paʁ də komɔ̃ dyk də lozœ̃], 1632 – 19 November 1723) was a French courtier and soldier. He was the only love interest of the "greatest heiress in Europe", Anne Marie Louise d'Orléans, Duchess of Montpensier, cousin of Louis XIV.

He is often noted for his command of a French expeditionary Brigade which served alongside the Jacobite Irish Army during the Williamite War. After defeat at the Battle of the Boyne in July 1690 his brigade retreated to Galway where it was evacuated to France. Nonetheless, he remained an influential figure at the Jacobite court in exile, particularly with Mary of Modena.