Bernard I (c. 950 – 9 February 1011) is the Duke of Saxony (973–1011), the second of the Billung dynasty, a son of Duke Herman and Oda.
He extends his father's power considerably.
He fighs the Danes in 974, 983, and 994 during their invasions.
He supports the succession of Otto III over Henry the Wrangler.
In 986, he is made marshal and in 991 and 995 he joins the young Otto on campaign against the Slavs.
He increases his power vis-à-vis the crown, where his father had been the representative of the king to the tribe, Bernard is the representative of the tribe to the king.
Bernard dies in 1011 and is buried in the Church of Saint Michael in Lüneburg.
