USS Neptune

USS Neptune has been the name of more than one United States Navy ship, and may refer to:


 * USS Clyde (1863), a 294-ton side-wheel steam gunboat, was briefly named Neptune when first commissioned


 * USS Neptune (1863), a 1244-ton screw steamship, served during the American Civil War


 * USS Manhattan (1863), a monitor in commission from 1864 to 1877, briefly named USS Neptune during 1869


 * USS Neptune (AC-8), was a collier that carried the first United States troops to Europe in World War I


 * USNS Neptune, was a Neptune-class cable repair ship, acquired by the US Navy in 1953 and scrapped in 2005


 * In fiction


 * A fictitious U.S. Navy nuclear submarine named USS Neptune was the setting of the 1978 movie Gray Lady Down