Ro-19, originally named Submarine No. 36, was an Imperial Japanese Navy Kaichū-Type submarine of the Kaichū III subclass. She was commissioned in 1922...

Ro-64, originally named Submarine No. 79, was an Imperial Japanese Navy Type L submarine of the L4 subclass. First commissioned in 1925, she served in...

Ro-65 was an Imperial Japanese Navy Type L submarine of the L4 subclass. First commissioned in 1926, she served in the waters of Japan prior to World War...

Ro-33 was an Imperial Japanese Navy Ro-33-class submarine. Completed and commissioned in November 1935, she served during World War II in the South China...

Ro-61, originally named Submarine No. 72, was an Imperial Japanese Navy Type L submarine of the L4 subclass. She was in commission at various times from...

Ro-34 was a Kaichū type submarine of the K6 sub-class built for the Imperial Japanese Navy. Completed and commissioned in May 1937, she served in World...

Ro-110 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...

Ro-62, originally named Submarine No. 73, was an Imperial Japanese Navy Type L submarine of the L4 subclass. She was in commission at various times from...

Ro-106 was an Imperial Japanese Navy Ro-100-class submarine. Completed and commissioned in December 1942, she served in World War II, operating in the...

Ro-68 was an Imperial Japanese Navy Type L submarine of the L4 subclass. First commissioned in 1925, she served in the waters of Japan prior to World War...

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...

most varied and powerful submarine fleets. The Imperial Japanese Navy (IJN) acquired its first submarines during the Russo-Japanese War on 12 December 1904...

Ro-104 was an Imperial Japanese Navy Ro-100-class submarine. Completed and commissioned in February 1943, she served in World War II, operating in the...

Ro-63, originally named Submarine No. 84, was an Imperial Japanese Navy Type L submarine of the L4 subclass. First commissioned in 1924, she served in...

Ro-43 was an Imperial Japanese Navy Kaichū type submarine of the K6 sub-class. Completed and commissioned in December 1943, she served in World War II...

Ro-1, originally named Submarine No. 18, was an Imperial Japanese Navy Type F submarine of the F1 subclass. She and her sister ship Ro-2 were the first...

Ro-44 was an Imperial Japanese Navy Kaichū type submarine of the K6 sub-class. Completed and commissioned in September 1943, she served in the central...

Ro-5, originally named Submarine No. 33, was an Imperial Japanese Navy Type F submarine of the F2 subclass. The Type F submarines were the first truly...

Ro-115 was an Imperial Japanese Navy Ro-100-class submarine. Completed and commissioned in November 1943, she served in World War II, operating in the...

Ro-109 was an Imperial Japanese Navy Ro-100-class submarine. Completed and commissioned in April 1943, she served in World War II, operating off the Solomon...

Ro-35 was an Imperial Japanese Navy Kaichū type submarine, the lead unit of the K6 sub-class. Completed and commissioned in March 1943, she served in...

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...

Ro-108 was an Imperial Japanese Navy Ro-100-class submarine. Completed and commissioned in April 1943, she served in World War II, operating in the Solomon...

Ro-45 was an Imperial Japanese Navy Kaichū type submarine of the K6 sub-class. Completed and commissioned in January 1944, she served in the central Pacific...

Ro-4, originally named Submarine No. 32, was an Imperial Japanese Navy Type F submarine of the F2 subclass. The Type F submarines were the first truly...

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...

Ro-2, originally named Submarine No. 21, was an Imperial Japanese Navy Type F submarine of the F1 subclass. She and her sister ship Ro-1 were the first...

Ro-46 was an Imperial Japanese Navy Kaichū type submarine of the K6 sub-class. Completed and commissioned in February 1944, she served in World War II...

Ro-31, originally named Submarine No. 70, was an Imperial Japanese Navy Kaichu-Type submarine of the Kaichu V (Toku Chu) subclass. After a diving accident...

Ro-60, originally named Submarine No. 59, was an Imperial Japanese Navy Type L submarine of the L4 subclass. She was in commission from 1923 to 1934 and...