USS Larkspur (1863) was a steamer acquired by the Union Navy during the American Civil War. She was used by the Navy as a tugboat. Larkspur was built in 1863 at Wilmington, Delaware, as Pontiac; purchased by the Navy at Wilmington from W. A. James & Co. 6 October 1863; delivered on the 12th; and commissioned at Philadelphia Navy Yard 16 October 1863, acting Ens. Francis B. Davis in command.