John de Warenne, 8th Earl of Surrey or Warenne, was the last Warenne earl of Surrey. He was the son of William de Warenne, the only son of John de Warenne, 7th Earl of Surrey. His mother was Joan, daughter of Robert de Vere, 5th Earl of Oxford. Warenne was only six months old when his father died, and was 8 years old when his mother died. He succeeded his grandfather as earl when he was 19.