Union was an American sloop built in Somerset, Massachusetts in 1792. It is best known for its circumnavigation of the world, 1794–1796, under the maritime fur trader John Boit. The sloop Union was 94 tons burthen, 65 ft 5 in (19.9 m) length overall, 19 ft 9 in (6.0 m) beam, and 8 ft 5 in (2.6 m) depth. She had a crew of 22, one deck, one mast, and a fore-and-aft rig. Her armament was 10 carriage guns, which were a mix of 6-pounders and 3-pounders, and 8 swivel guns mounted on the rails.