Rufus King (January 26, 1814 – October 13, 1876) was an American newspaper editor, public servant, diplomat, and soldier. He served as a Union Army brigadier general in the American Civil War, and was responsible for assembling the famed Iron Brigade of the Army of the Potomac. He was later U.S. minister (ambassador) to the Papal States from 1864 to 1867 and was instrumental in the capture of accused Lincoln assassination plotter John Surratt. Earlier in life, he had been a member of the first board of regents of the University of Wisconsin.