David Butts Harmony (September 2, 1832 – November 2, 1917) was a rear admiral of the United States Navy, who served during the American Civil War. Harmony was born in Easton, Pennsylvania, and entered the navy as a midshipman on April 7, 1847, was promoted to passed midshipman on June 10, 1852, became lieutenant in 1855, and lieutenant commander in 1862. Promoted to commander in 1866, Harmony then served at the New York Navy Yard, and then in 1867–69 commanded the Frolic in the European Squadron, one of the vessels of Admiral Farragut's squadron.