The USS Harvest Moon was a steam operated gunboat acquired by the Union Navy during the American Civil War.

Harvest Moon, a side-wheel steamer, was built in 1863 at Portland, Maine, and was purchased by Commodore Montgomery from Charles Spear at Boston, Massachusetts, 16 November 1863.

[1] For the next nine months the steamer served off Tybee Island, Georgia, the North Edisto River, and Charleston harbor.

[1] While proceeding in company with the tugboat USS Clover shortly after 08:00 on 1 March 1865 Harvest Moon struck a torpedo (mine) in Winyah Bay, South Carolina.

[1] In 1963, nearly 100 years later, a project was initiated to raise Harvest Moon from the mud at the bottom of Winyah Bay and to restore the ship, but has made little headway.