Wichmann I the Elder (also spelled Wigmann or Wichman) (died 23 April 944) was a member of the Saxon House of Billung.
He was a brother of Amelung, Bishop of Verden, and Herman, Duke of Saxony.
In 938, Wichmann rebelled because his younger brother Herman had been given military command of the northern reaches of the Duchy of Saxony.
He believed that he had a better claim to the office by virtue of his seniority and his Königsnähe (closeness to the king), because he was related by marriage to the queen dowager Matilda.
She left him at least three sons and a daughter: Wichmann and Frederuna may have been the parents of Dietrich, Margrave of the Nordmark.