Ordulf (sometimes Otto) (c. 1022 – 28 March 1072) was the duke of Saxony from 1059, when he succeeded his father Bernard II,[1] until his death.

Ordulf's entire reign was occupied by wars with the Wends.

[2] Their son Magnus succeeded Ordulf as Duke of Saxony.

[3] Ordulf's second wife, Gertrude of Haldensleben,[4] daughter of a Count Conrad, was imprisoned in Mainz in 1076 and died 21 February 1116.

Their son Bernard died after a fall from a horse in Lüneburg on 15 July of an unknown year.