Egbert I (German: Ekbert) (died 11 January 1068) was the Margrave of Meissen from 1067 until his early death the next year.
Egbert was the Count of Brunswick from about 1038, when his father, Liudolf, Margrave of Frisia, died.
He inherited the familial lands in Brunswick and from about 1051 he shared the chief authority in the region with the Bishop of Hildesheim.
Although closely related to the Salian dynasty, Egbert participated in the coup d'état of Kaiserswerth in 1062, whereat a group of nobles acting under Anno II, Archbishop of Cologne, tried to seize authority in the kingdom from King Henry IV and his regent mother, the Empress Agnes.
In 1058, Egbert married Immilla, the daughter of Ulric Manfred II of Turin, and widow of Otto of Schweinfurt.