Douglas Harris Crofut (November 6, 1942 – July 27, 1981) was an American radiographer who died as a result of radiation burns and radiation poisoning. His death was the first of its kind in the United States since the 1940s, when radiation deaths occurred during the Manhattan Project at Los Alamos, New Mexico. It is the only U.S. death attributable to an unknown source of radiation, and the only known case in the U.S. of a suspected suicide undertaken via radiation exposure.