Theodbert (also Theodebert, Theudebert, Theotpert, and Theodo) (c. 685 – c. 719) was the duke of Bavaria in some capacity or other from 702 to his death.
In 711, his younger brother Theobald was co-ruling as well and his father was making plans for a fourfold division of the duchy on his death.
His father did have him swear to always defend Rupert of Salzburg when he transferred the government to Theodbert.
Theodbert also provided military help to Ansprand and Liutprand in their reconquest of Italy in 712.
Theodbert had married Regintrude and had a son and a daughter: Hugbert, the only grandson of Theodo II, who inherited the duchy united after Grimoald's death, and Guntrude, who married Liutprand.