Karl Friedrich Wilhelm Reyher (from 1828 von Reyher) (21 June 1786, in Groß Schönebeck – 7 October 1857, in Berlin) was a Prussian soldier during the Napoleonic wars and later an officer who served as Minister of War in the government of Gottfried Ludolf Camphausen during the Revolution of 1848. After 1848 he also served as chief of the General Staff.