Ro-17, originally named Submarine No. 34, was an Imperial Japanese Navy Kaichū-Type submarine of the Kaichū III subclass. She was commissioned in 1921...

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-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...

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-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-101 was an Imperial Japanese Navy Ro-100-class submarine. Completed and commissioned in October 1942, she served in World War II and operated in the...

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-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...

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-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-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-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-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-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-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...

Ro-66 was an Imperial Japanese Navy Type L submarine of the L4 subclass. First commissioned in 1927, she served in the waters of Japan prior to World War...

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-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-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...

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-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...

The Kaichū type submarine (海中型潜水艦, Kaichū-gata sensuikan) submarines were double-hulled medium-sized submarines of the Imperial Japanese Navy during World...

Ro-3, originally named Submarine No. 31, was an Imperial Japanese Navy Type F submarine of the F2 subclass. The Type F submarines were the first truly...

The Type L submarine (L型潜水艦, L-gata Sensuikan) submarines were medium-sized submarines of the Imperial Japanese Navy (IJN), serving during the 1920s and...

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-16, originally named Submarine No. 37, was an Imperial Japanese Navy Kaichū-Type submarine of the Kaichū III subclass. She was commissioned in 1922...

Ro-51, originally named Submarine No. 25, was an Imperial Japanese Navy Type L submarine of the L1 subclass. She was in commission from 1920 to 1938. The...

Ro-42 was an Imperial Japanese Navy Kaichū type submarine of the K6 sub-class. Completed and commissioned in August 1943, she served in World War II and...

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...

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...