Karl Konstantin Albrecht Leonhard Graf von Blumenthal (30 July 1810 – 21 December 1900) was an officer of the Prussian Army and field marshal of the Imperial German Army, chiefly remembered for his decisive intervention at the Battle of Königgrätz in 1866, his victories at Wörth and Weißenburg, and above all his refusal to bombard Paris in 1870 during the siege, of which he was in command.