Henri de Lorraine (20 March 1601 – 25 July 1666, Royaumont Abbey), known as Cadet la Perle, was a French nobleman.

He was the younger son of Charles I, Duke of Elbeuf and his wife Marguerite de Chabot, countess of Charny.

Harcourt first saw active duty at the siege of Prague in November 1620, and because of his bravery he was nicknamed Cadet la Perle by his companions after the pearl he wore in his ear.

In 1637, he fought in Piedmont during the Franco-Spanish War (1635–1659), where he defeated a Spanish army, very superior in numbers, near Chieri.

During the Fronde, he remained loyal to the regent-queen Anne of Austria, but clashed with Mazarin, and retreated to the Alsace.