Imperial Japanese Navy submarines originated with the purchase of five Holland type submarines from the United States in 1904. Japanese submarine forces progressively built up strength and expertise, becoming by the beginning of World War II one of the world's most varied and powerful submarine fleets.
German submarine U-1224 was a Type IXC/40 U-boat of Nazi Germany's Kriegsmarine built for service during World War II. She was constructed by Deutsche Werft of Hamburg, used as a training ship for Japanese sailors, and transferred into Japanese service on 15 February 1944. In the Imperial Japanese Navy, she served as RO-501 until sunk May 1944.
I-44 was an Imperial Japanese Navy Type B2 submarine. Completed and commissioned in January 1944, she served in the late stages of World War II, she conducted war patrols in the Pacific Ocean as a conventional submarine before she was converted into a kaiten suicide attack torpedo carrier. She then conducted kaiten operations during the Battle of Iwo Jima and the Battle of Okinawa before she was sunk in April 1945.
Ro-41 was an Imperial Japanese Navy Kaichū type submarine of the K6 sub-class. Completed and commissioned in November 1943, she served in World War II and conducted six war patrols, sinking a destroyer escort USS Shelton (DE-407) on one of them, before she was sunk in March 1945.
Ro-49 was an Imperial Japanese Navy Kaichū type submarine of the K6 sub-class. Completed and commissioned in May 1944, she served in World War II and patrolled off the Philippines and the Ryukyu Islands. She was lost during her third war patrol sometime in late March or April 1945.
Ro-50 was an Imperial Japanese Navy Kaichū type submarine of the K6 sub-class. Completed and commissioned in July 1944, she served in World War II, conducting four war patrols, including operations off the Philippine Islands and the Ryukyu Islands. The only Kaichu-type submarine to survive the war, she surrendered in 1945 after its conclusion and was scuttled in 1946.
The second Ro-56 was an Imperial Japanese Navy Kaichū type submarine of the K6 sub-class. Completed and commissioned in November 1944, she served in World War II and was sunk during her first war patrol in April 1945.
Ro-55 or Japanese submarine Ro-55 may refer to more than one submarine of the Imperial Japanese Navy:
Ro-105 was an Imperial Japanese Navy Ro-100-class submarine. Completed and commissioned in March 1943, she served in World War II, operating in the Aleutian Islands campaign, New Guinea campaign, and Solomon Islands campaign and in the vicinity of Truk, Rabaul, and the Admiralty Islands before she was sunk in May 1944 during her fourth war patrol.
Ro-111 was an Imperial Japanese Navy Ro-100-class submarine. Completed and commissioned in July 1943, she served in World War II, operating in the Indian Ocean — where she sank a cargo ship and a troopship — and off the Admiralty Islands in the Pacific Ocean. She was sunk in June 1944 during her fifth war patrol.
Ro-113 was an Imperial Japanese Navy Ro-100-class submarine. Completed and commissioned in October 1943, she served in World War II, operating off the Admiralty Islands, in the Indian Ocean — where she sank the last Allied ship torpedoed by a Japanese submarine during World War II — and off the Philippine Islands. She was sunk in February 1945.
Ro-116 was an Imperial Japanese Navy Ro-100-class submarine. Completed and commissioned in January 1944, she served in World War II and was sunk in May 1944 during her second war patrol.
Ro-117 was an Imperial Japanese Navy Ro-100-class submarine. Completed and commissioned in January 1944, she served in World War II and was sunk in June 1944 during her second war patrol.
Ro-27, originally named Submarine No. 58, was an Imperial Japanese Navy Kaichū-Type submarine of the Kaichū IV subclass. She was in commission from 1924 to 1937.
Ro-28, originally named Submarine No. 46, was an Imperial Japanese Navy Kaichū-Type submarine of the Kaichū IV subclass. She was in commission from 1923 to 1938 and from 1939 to 1940.
Ro-15, originally named Submarine No. 24, was an Imperial Japanese Navy Kaichū-Type submarine of the Kaichū II subclass. She was commissioned in 1921 and operated in the waters of Japan. She was stricken in 1933.
Ro-14, originally named Submarine No. 22, was an Imperial Japanese Navy Kaichū-Type submarine of the Kaichū II subclass. She was commissioned in 1921 and operated in the waters of Japan. She was stricken in 1933.
Ro-11, originally named Submarine No. 19, was an Imperial Japanese Navy Kaichū-Type submarine of the Kaichū I subclass. She and her sister ship Ro-12 were the first submarines built to a fully Japanese design. She was commissioned in 1919 and operated in the waters of Japan. She was stricken in 1932.
Ro-12, originally named Submarine No. 20, was an Imperial Japanese Navy Kaichū-Type submarine of the Kaichū I subclass. She and her sister ship Ro-11 were the first submarines built to a fully Japanese design. She was commissioned in 1919 and operated in the waters of Japan. She was stricken in 1932.
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