Adelhard von Burc (died after 1 July 874) was lay abbot of Cysoing.
He was a son of the Frankish Duke of Friuli Eberhard and his wife Gisela, daughter of Louis the Pious.
[1] He was a lay abbot in the Abbey of Saint-Calixte de Cysoing.
[2] He married Swanaburc, by whom he had Eberhard (born c. 856, died after 889) who was count in Sülichgau (also Sülchgau).
One of his granddaughters through Eberhard was Judith, who married Arnulf, Duke of Bavaria.