Siegmund Moritz William von Langen, also called Simon Moritz, ( 1706 or 1708, Westphalia–21 October 1758, Bautzen, Silesia), was a Prussian major of the who died of injuries received in the Hochkirch churchyard during the Battle of Hochkirch, in the Seven Years' War. His actions at Hochkirch delayed the Austrian forces sufficiently for Frederick the Great to organize a retreat. This saved the Prussian army.