Hermann Billung, Frankish lieutenant (b. 900)
Hermann Billung (900 or 912 – 27 March 973) was the margrave of the Billung March from 936 until his death. The first of the Saxon House of Billung, Hermann was a trusted lieutenant of Emperor Otto I.

Though never Duke of Saxony himself, while Otto (who was the enthroned duke of Saxony) was in Italy from 961 until 972, Hermann served as Otto's personal representative in governing Saxony. Towards the end of his life, Hermann was the effective duke in all but name.

Hermann died in 973, just two months before Otto's own death. Hermann's son Bernard I was named as the new duke of Saxony by Otto I's son Otto II.