William Hunter Campbell (September 9, 1839 – June 18, 1862) was an Ohio civilian who worked for the Union Army during the early years of the American Civil War. He participated in a daring raid behind enemy lines on the Western and Atlantic Railroad, known famously as the Great Locomotive Chase. The mission failed and Campbell and seven fellow raiders were executed by the Confederates on the charge of spying. Secretary of War Edwin M. Stanton awarded the first Medals of Honor to several of the raiders. As a civilian, Campbell was not eligible.