Leo Keith Thorsness (born February 14, 1932) is a retired colonel in the United States Air Force who received the Medal of Honor for his actions in the Vietnam War. He was awarded the medal for an air engagement on April 19, 1967. He was shot down two weeks later and spent six years in captivity in North Vietnam as a prisoner of war. After his military service, Thorsness served one term in the Washington State Senate.