Hans Georg Hermann von Plessen (26 November 1841 – 28 January 1929) was a Prussian Colonel General with the rank of Generalfeldmarschall and Canon of Brandenburg.

He held the office of His Majesty's Orderly Adjutant General (German: SM diensttuender Generaladjutant) to Kaiser Wilhelm II, thus making him one of the Emperor's closest confidants.

[1] By 1918, he was the oldest serving officer in the Imperial German Army, although Paul von Hindenburg falsely claimed this for himself.

In 1907, Plessen replaced Berhard von Werder as largely ceremonial head of the Mounted Feldjäger Corps, a company-strength unit of officers serving as couriers.

[5] On 17 November 1918, after accompanying the emperor into exile, he was retired with the rank of Generaloberst mit dem Range als Generalfeldmarschall.