Ligulf (sometimes Liulf or Ligulf of Lumley; died 1080) was an Anglo-Danish nobleman with landholdings in the north of England.
Ligulf was married to Ealdgyth, the daughter of Ealdred the earl of Northumbria. Ligulf's mother was a descendant of the earls of Bernicia. Ligulf was noted for his devotion to Saint Cuthbert.
After the death of Waltheof in 1076, Ligulf was one of the last remaining noblemen in the north with ties to the house of Bamburgh, and he became one of the main advisors to Walcher, the Bishop of Durham. Two of Walcher's other advisors, Leobwin and Gilbert were opposed to Ligulf's advice. According to John of Worcester, Leobwin took offence at the manner in which Ligulf replied to Leobwin's opposition to Ligulf's advice to the bishop. In April or May 1080 they attacked Ligulf's house in the middle of the night and killed most of the household, including Ligulf. The two men were aided by the bishop's own knights, although it is not clear if Walcher was involved in the plot or not.
Ealdgyth survived Ligulf's death, as Walcher offered her a gift of land to settle the feud. Walcher met Ligulf's surviving family at Gateshead and attempted to persuade them that the bishop had not been involved in the murder. Ligulf's family did not believe the bishop and on 14 May 1080 Ligulf's partisans killed Walcher and his supporters at the parley.
Ligulf and Ealdgyth had two sons – Morcar and Uhtred. Morcar became a monk at Jarrow. Uhtred may be the same as the Uhtred recorded in Domesday Book holding a manor at Rudston in Yorkshire as a tenant-in-chief of the king. Ligulf may also have had a daughter named Ragnald, as a "Ragnald, daughter of Ligulf" is recorded as granting lands to Fountains Abbey in the 1130s. She was married to Robert de Sarz.