USS Naumkeag was a steamer purchased by the Union Navy during the American Civil War. She was used by the Union Navy as a gunboat assigned to patrol Confederate waterways. Naumkeag, a wooden stern-wheel steamboat built at Cincinnati, Ohio, early in 1863, was purchased by the Navy at Cairo, Illinois, 14 April 1863 from Allen Collier; and commissioned at Mound City, Illinois, 16 April 1863, Lt. Comdr. George Brown in command.