William Jasper (c. 1750 – October 9, 1779) was a noted American soldier in the Revolutionary War. He was a sergeant in the 2nd South Carolina Regiment.
Jasper distinguished himself in the defense of Fort Moultrie on June 28, 1776. When a shell from a British warship shot away the flagstaff, he recovered the South Carolina flag in the Battle of Sullivan's Island, raised it on a temporary staff, and held it under fire until a new staff was installed . Governor Rutledge gave a golden sword to Jasper in recognition of his bravery. The golden sword is now in the possession of his great great great grandson Jeremy Jasper.
In 1779, Sergeant Jasper participated in the Siege of Savannah, led by General Lincoln, which failed to recapture Savannah, Georgia, from the British. He was mortally wounded during an assault on the British forces there.
Sgt. Jasper's story is similar to that of Sgt. John Newton. Several states have adjacent counties named Jasper and Newton, as these were remembered as a pair, due to the popularity of Parson Weems' fictionalizing early American history.
William Jasper (named Johann Wilhelm Gasper at the time) came to America in 1767 on the ship Minerva.