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 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 eldest surviving son and 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.

Eadric's nickname "Streona" is loosely translated as the "Acquisitive" or the "Grasper" and first appears in Hemming's Cartulary.

Eadric's family appears to have had interests in Shropshire and Herefordshire. John of Worcester names Eadric's father as Æthelric, a thegn who attended court from the late 980s onwards, and his siblings as Brihtric, Ælfric, Goda, Æthelwine, Æthelweard, and Æthelmær, of whom the last is said (probably mistakenly) to have been the father of Wulfnoth Cild, who was the father of Earl Godwin. The chronicler also left a blank space between Ælfric and Goda, as if allowing for the name of another brother. Thegns bearing these names occur among the witnesses to the charters issued in the name of King Æthelred II in the late tenth and early eleventh centuries. These thegns occur quite often in groups of two or three, which might be interpreted as evidence that they were members of the same family. Æthelric seems to have been accompanied from the mid-990s onwards by one or more of his sons (not including Ælfric). Judging from the witness lists, it may be that the name of the other brother was Æthelnoth.

At some time before 1009 Eadric married Eadgyth (Edith), the daughter of King Æthelred. This was a political marriage, intended to strengthen alliances. Although instrumental in serving Æthelred for many years, Eadric ultimately ended up changing his allegiance several times, and betraying his wife's family. There is no record of Eadric and Eadgyth having any children, though it has been suggested that they had a daughter who was mother of Siward 'Grossus', a rich thegn of Shropshire.

Eadric himself is perhaps first identifiable in the witness lists of charters, along with his father and brother Brihtric, in 1002. Other members of Eadric's family seem to have been present at court in some strength in 1004–5; there are no lists in which Eadric appears in 1006, but Eadric was reported in that year for being involved in the killing of Ealdorman Ælfhelm. According to John of Worcester: