Harlon Henry Block (November 6, 1924 – March 1, 1945) was a United States Marine Corps corporal who was killed in action during the Battle of Iwo Jima in World War II.
Born in Yorktown, Texas, Block joined the Marine Corps with seven high school classmates in February 1943, and subsequently participated in combat on Bougainville and Iwo Jima.
He is best known for being one of the six flag-raisers who helped raise the second U.S.
flag atop Mount Suribachi on February 23, 1945, as shown in the iconic photograph Raising the Flag on Iwo Jima.
The Marine Corps War Memorial located in Arlington, Virginia, which was modeled after the flag-raising photograph, depicts bronze statues of each of the six Marine flag-raisers.