Alton Warren Knappenberger (December 31, 1923 – June 9, 2008) was a United States Army soldier and a recipient of the United States military's highest decoration—the Medal of Honor—for his actions in World War II.
Knappenberger joined the Army from Spring Mount, Pennsylvania, in March 1943, and by February 1, 1944, was serving as a private first class in the 30th Infantry Regiment, 3rd Infantry Division.
On that day, during the Battle of Cisterna in Italy, Knappenberger held an exposed position alone and harassed the attacking Germans with his automatic rifle until he ran out of ammunition.
For his actions during the battle, he was issued the Medal of Honor three months later, on May 26, 1944.