The third USS Scorpion was a steamer in commission in the United States Navy from 1847 to 1848. Scorpion was built in 1846 as the commercial steamship SS Aurora by Bishop and Simonson at New York City for Sidney Mason and William D. Thompson. The U.S. Navy purchased Aurora at New York on 7 January 1847 for use in the Mexican War and commissioned her as USS Scorpion on 23 February 1847 with Commander Abraham Bigelow in command. Once again in civilian service, she became the merchant steamer Isthmus, and was lost at sea in 1854.