The first USS Jamestown was a sloop-of-war in the United States Navy during the Mexican–American War and the American Civil War.
Jamestown was launched in 1844 by the Gosport Navy Yard, Virginia; and commissioned there on 12 December, with Commander Robert B. Cunningham in command.
She departed Hampton Roads on 25 June 1845 as flagship of Commodore Charles W. Skinner in command of United States naval vessels operating off the western coast of Africa to suppress the slave trade. At the end of her first deployment the sloop arrived at Boston, Massachusetts on 6 August 1846.
While she was moored at the Boston Navy Yard word reached the United States that for the second consecutive year blight had ruined the potato crop of Ireland, depriving the people of that country of their chief means of subsistence. A joint resolution of Congress approved 3 March 1847 authorized the Secretary of the Navy to place Jamestown and Macedonian at the disposal of Captains Robert Bennet Forbes and George Coleman De Kay to carry food to the starving poor of Ireland. Jamestown sailed from Boston on 28 March and arrived at Cork, Ireland on 12 April. After unloading her life-saving cargo, the sloop returned to Boston on 17 May.
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