Harold Paul Keller (August 3, 1921 – March 13, 1979) was a United States Marine corporal who was wounded in action during the Bougainville campaign in World War II. During the Battle of Iwo Jima, he was a member of the patrol that captured the top of Mount Suribachi and raised the first U.S. flag on Iwo Jima on February 23, 1945. He is one of the six Marines who raised the larger replacement flag on the mountaintop the same day as shown in the iconic photograph "Raising the Flag on Iwo Jima".