Silas M. Duncan (1788 – 14 September 1834) was an officer in the United States Navy during the War of 1812. Born in Rockaway Township, New Jersey, Duncan was appointed midshipman 15 November 1809. While third lieutenant of Saratoga during the Battle of Lake Champlain, 11 September 1814, he was sent in a gig to order the gunboats to retire. He succeeded in delivering the orders despite concentrated enemy fire which severely wounded him and caused the loss of his right arm. For his gallant conduct he was thanked by Congress. From 1818 to 1824 Commander Duncan saw active service on board Independence, Hornet, Guerriere, Cyane, and Ferret.