Ning Hai () was a light cruiser in the Republic of China Navy (ROCN) before World War II and the lead ship of her class. She was sunk in the early days of the Second Sino-Japanese War by aircraft from the Imperial Japanese Navy, and her wreck was raised and repaired by the Japanese, re-entering service with the Japanese Navy in the Pacific War as the escort vessel Ioshima. She was sunk again in September 1944 by a USN submarine.
By the end of the 1920s, the ROCN had only four antiquated 19th century protected cruisers and two training cruisers received before World War I. The Kuomintang government had an ambitious re-armament plan but lacked funds, and after extensive negotiations with shipbuilders in the United States, United Kingdom, Germany and Japan, placed an order with the Japanese for one light cruiser to be built in Japan, with a second vessel to be built in China with Japanese assistance. Despite the very strained political relations between Japan and Chi