Hermann von Boyen, Prussian general and politician, Prussian Minister of War (born 1771)

Leopold Hermann Ludwig von Boyen was a Prussian army officer who helped to reform the Prussian Army in the early 19th century. He also served as minister of war of Prussia in the period 1810–1813 and again from 1 March 1841 – 6 October 1847.

The Prussian Ministry of War was the highest state authority of the Royal Prussian Army and was responsible for the central administration of the army of the Kingdom of Prussia and, later, the Imperial German Army. The ministry existed from 1808 through the establishment of the German Empire and was dissolved in 1919, being succeeded by the Ministry of the Reichswehr.