Eadric Streona (died 1017) was Ealdorman of Mercia from 1007 until he was killed by King Cnut. Eadric was given the epithet "Streona" (translated as "The Acquisitive”) in Hemming's Cartulary because he appropriated church land and funds for himself. Eadric became infamous in the Middle Ages because of his traitorous actions during the Danish re-conquest of England.
Eadric was one of at least eight children and had relatively humble beginnings: his father Ethelric attended the court of King Æthelred the Unready, but was of no great significance and is not known to have had any titles. Even before becoming an ealdorman, Eadric seems to have acted as Æthelred's enforcer; in 1006 he instigated the killing of the Ealdorman of York, Elfhelm. Eadric was married to Æthelred's daughter Eadgyth by 1009, thus becoming his son-in-law. Eadric was appointed Ealdorman of Mercia in 1007.
As an ealdorman, Eadric played an important role in the affairs of the kingdom. In 1009 he negotiated with marauding Vikings to save the life of Archbishop Ælfheah of Canterbury, which proved to be unsuccessful. Eadric also continued to organise the killings of prominent nobles — supposedly upon orders of the king. However, he betrayed his father-in-law in 1015, joining the Dane Cnut, the son of Sweyn Forkbeard, against England.
Accompanying his new liege Cnut, Eadric went on a campaign of plundering throughout England until in the summer of 1016, when a series of major battles were fought with Edmund Ironside, the successor of the deceased king Æthelred. The decisive battle was fought at Assandun on 18 October 1016. Eadric by that time had returned to his brother-in-law's side, but he fled the field with his men for uncertain reasons, though it was possibly pre-planned. After peace was made between Cnut and Edmund, Eadric was allowed to remain earl, however after a year Cnut had Eadric killed at London during the Christmas festivities in 1017.