Waleran II of Arlon, supposedly also called Udon of Limburg, was the count of Arlon from 1052 and, if he was the same person as Udon, also count of Limburg from 1065 and advocatus of the Abbey of Sint-Truiden. He was the younger son of Waleran I, Count of Arlon, and his wife Adelaide. His elder brother Fulk became Count of Arlon.