USS Glaucus was a large steamship acquired by the Union Navy during the American Civil War. The Union Navy planned to use her as a gunship in the blockade of ports of the Confederate States of America, but, also found it useful to use her to transport the president of Colombia to Cartagena, Colombia. On her return to blockade duty, Glaucus experienced a fire and several groundings, but managed to make it through to the end of the war.