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 returned to the New York Navy Yard in 1869–72, was promoted to captain in 1875, and commanded the sloops Portsmouth, Kearsarge and Plymouth, and the frigates Powhatan, Tennessee and Colorado, between 1878 and 1883.

Harmony was a member of Navy Department's Examining and Retiring Boards 1883–84, was promoted to commodore in 1885, and served as Chief of the Bureau of Yards and Docks, 1885–89, and was Chairman of the Lighthouse Board, 1889–91.

Harmony died on November 2, 1917, and was buried in Section 2 of Arlington National Cemetery.

[1] Some of his letters from the 1870s, written while on active duty, are archived at the National Archives and Records Administration in Washington, D.C. A selection of David Harmony's official papers, from the estate of Isabel Mixsell-Mathews, can be viewed here: