USS Samuel Rotan was a schooner acquired by the Union Navy during the American Civil War. She was outfitted by the Union Navy as a gunboat to patrol navigable waterways of the Confederacy to prevent the South from trading with other countries. Prior to the war, the US Navy had mostly large, deep draft, oceangoing vessels. The establishment of the Union blockade required small, fast, shallow draft vessels like the Samuel Rotan for littoral operations.