USS Nymph was a steamer acquired by the Union Navy during the American Civil War. She was used by the Union Navy as a dispatch boat in support of the Union Navy blockade of Confederate waterways.
Cricket No. 3, a stern wheel wooden river steamer built at Cincinnati, Ohio, in 1863, was purchased by the Navy at Cincinnati 8 March 1864, fitted out as a "tinclad" gunboat, and commissioned at Mound City, Illinois, as Nymph 11 April 1864, Acting Master Patrick Donnelly in command.
Nymph patrolled the Mississippi River and its tributaries through the end of the Civil War, helping to maintain Union lines of supply and communication.
She decommissioned miles above Cairo, Illinois, 28 June 1865 and was sold at public auction at Mound City 17 August 1865 to M. A. Hutchinson.