Captain John Henry Ebersole, M.D., MC USN (26 January 1925 – 23 September 1993) was a pioneer in submarine medicine and radiation oncology, selected by Admiral Hyman G. Rickover to serve as medical officer aboard the US Navy's first two nuclear powered submarines, the USS Nautilus and the USS Seawolf. He was the radiologist for NASA that screened the Mercury Seven astronauts for Project Mercury. Ebersole was the radiologist responsible for the x-rays taken during the autopsy of John F. Kennedy on 22 November 1963 at Bethesda Naval Medical Center.