Henry Oliver "Hank" Hansen (December 14, 1919 – March 1, 1945) was a United States Marine Corps sergeant who was killed in action on March 1, 1945 during the Battle of Iwo Jima in World War II. He participated in the first United States flag raising over Iwo Jima, and was, for a time, mistakenly identified as one of the six flag rasiers in the famous photograph of the second flag raising by Joe Rosenthal.