William de Warenne was the name of four English noblemen, all related, and all also Earl of Surrey. They were frequently referred to as Earl Warenne or Earl of Warenne instead of Earl of Surrey.
William de Warenne, 1st Earl of Surrey (d. 1088)
William de Warenne, 2nd Earl of Surrey (d. 1138)
William de Warenne, 3rd Earl of Surrey (d. 1148)
William de Warenne, 6th Earl of Surrey (d. 1240)
William of Blois, 4th Earl of Surrey, was also sometimes referred to as William de Warenne.
