Siegfried Knappe (15 January 1917 – 1 December 2008) was an officer in the German Army (Heer) during World War II.

Because the area was wooded, the 105 mm gun had to be brought up and fired almost at point blank range directly into the house.

While participating in the invasion of the Soviet Union in 1941, he received the Iron Cross 1st class for his bravery, in particular for leading artillery attacks from forward positions.

Knappe immigrated to the United States with his wife, Lieselotte ("Lilo"; nee Brecht), who died in 2002, and their children, and settled in Ohio.

The Oscar-nominated film Downfall (2004), about German dictator Adolf Hitler's last days, was based in part on Knappe's memoirs.