Louis-Joseph de Montmorency-Laval (July 17, 1724 – June 17, 1808) was a French cardinal of the Catholic Church. He was the bishop of Orléans, left the position after four years, only to become bishop of Condom for two years, and later bishop of Metz and "grand aumônier" of the French court. He was created cardinal on March 30, 1789 by Pius VI.
During the French Revolution Laval-Montmorency left France and lived in exile in Germany. He did not participate at the 1799–1800 Papal conclave. He died on June 17, 1808 in the German town of Altona.