Helmut Karl Otto Beumann (23 October 1912, Braunschweig – 14 August 1995, Marburg) was a German historian.
In 1932 he moved to Berlin and studied with Robert Holtzmann; he received his doctorate after a dissertation on the deeds and writs of the bishops of Halberstadt.
At the Archiveschule in Berlin he met Carl Erdmann, whom he later praised as the "master of textual criticism and the history of ideas which it founded".
In 1984 he was raised by Hans Krollmann to the Order of Merit of the Federal Republic of Germany; in 1987 he was recognized by the state of Baden-Württemberg.
Beumann is credited with raising Marburg's reputation to one of the best universities in Germany for the research and teaching of the Middle Ages.