Ecgberht I of Northumbria (died 873) was King of Northumbria from 867 to 872, succeeding Osberht of Northumbria and preceding Ricsige of Northumbria.Ecgberht was a Northumbrian nobleman who pledged his allegiance to the invading Vikings in 867 in exchange for being made their puppet king of Northumbria, succeeding the vanquished Osberht of Northumbria. He ruled over the Northumbrians beyond the Tyne, with the Vikings directly ruling the south. Ecgberht served as the Great Heathen Army’s tax collector until he was ousted by a rebellion in 872, and he died a year later.