Henry de Sully (died 1189) was Abbot of Fécamp and Bishop-designate of Salisbury and Archbishop-elect of York.

Henry was son of William, Count of Sully, the eldest brother of Stephen, King of England and Henry of Blois, Bishop of Winchester.^[1] Henry's mother was William's wife, Agnes of Sully, who had been attached to the household of Adela of Blois, William's mother. Although William was the eldest son of Adela and her husband Stephen, Count of Blois, he was passed over for the comital title and his younger brother Theobald became Count of Champagne on their father's death.^[2]

Henry became a Cluniac monk, and was nominated in March 1140 by Henry of Blois to be Bishop of Salisbury, but the nomination was quashed.^[3][4] As compensation, Henry of Blois then named Henry de Sully the abbot of Fécamp Abbey in Normandy.^[1] Later in 1140, after his grandmother's death, Henry was nominated to become Archbishop of York,^[5] but his election was again quashed this time by Pope Innocent II because Henry wished to hold both the abbacy of Fécamp along with the archbishopric.^[6][7] Henry died at Fécamp in 1189.^[3]

The seal of Henry de Sully, is oval, 70 mm, depicting a seated abbot seen from the front, holding his crosier in his right and left hands. It shows an open book, SIGILLUM ABBATIS SANCTE TRINITATIS FICANNI, (A 8704)