Louis II d'Orléans, duc de Longueville and comte de Dunois was a French aristocrat and the first husband of Mary of Guise, who later became queen consort of Scotland and mother to Mary, Queen of Scots. He was the second son of Louis I d'Orléans, duc de Longueville by his wife Jeanne of Hochberg, and succeeded his brother Claude when the latter died in 1524.