Léonor d'Orléans (1540 – 7 August 1573) was duc de Longueville, prince of Châtellaillon, marquis of Rothelin, count of Montgommery and of Tancarville, visount of Abberville, Melun, count of Neufchâtel and of Valangin, was governor of Picardy and Normandy and one of the military leaders of the French Wars of Religion.