The first USS Adirondack was a large and powerful screw-assisted sloop of war with heavy guns, contracted by the Union Navy early in the American Civil War. She was intended for use by the Union Navy as a warship in support of the Union Navy blockade of Confederate waterways. Her career with the Navy proved to be short, yet active and historically important. USS Adirondack was one of four sister ships which included the Housatonic, Ossipee and Juniata.