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This List of Japanese Naval ships and war vessels in World War II is a list of seafaring vessels of the Imperial Japanese Navy of World War II. It includes submarines, battleships, oilers, minelayers and other types of Japanese sea vessels of war and naval ships used during wartime.

Aircraft carrier

Heavy/Fleet carriers

Fleet Carrier (11)
Class	Picture	Type	Ships (Years in Service)	Displacement	Note
Akagi-class		Fleet carrier	Akagi (1927–1942)	36,500 tonnes	Converted from an Amagi-class battlecruiser. Sunk at Midway on June 5, 1942
Kaga-class		Aircraft carrier	Kaga (1928–1942)	38,200 tonnes	Converted from a Tosa-class battleship. Sunk at Midway on June 4, 1942
Sōryū-class		Aircraft carrier	Sōryū (1937–1942) Hiryū (1939–1942)	16,200 tonnes	Hiryū is often considered to be a separated class. Sunk at Midway on June 5, 1942, Soryu took part in the attack on Pearl Harbor, the Battle of Wake Island, and supported the conquest of the Dutch East Indies. She was sunk at Midway on June 4, 1942
Shōkaku-class		Aircraft carrier	Shōkaku (1941–1944) Zuikaku (1941–1944)	25,675 tonnes	With the exception of the Battle of Midway, Shōkaku and Zuikaku participated in every major naval action of the Pacific War, including the attack on Pearl Harbor, the Indian Ocean Raid, the Battle of the Coral Sea, and the Guadalcanal Campaign. Both carriers were sunk during the 1944 Pacific campaigns.
Unryū-class		Aircraft carrier	Unryū (1944–1944) Amagi (1944–1945) Katsuragi (1944–1945)	17,480 tonnes	The design for these ships was based on the aircraft carrier Hiryū. IJN Planned to build 16 ships, however only 3 were completed and 2 almost completed (one of which was sunk as a target then salvaged and later scrapped) before the project was abandoned in favour of Shinano's construction. Unryū was sunk by the USS Redfish, Amagi capsized after air attacks and Katsuragi was the only heavy carrier to survive the war
Taihō-class		Aircraft carrier	Taihō (1944–1944)	30,250 tonnes	A bit of a break from traditional Japanese carrier design, Taiho was a heavily armoured carrier expected to withstand multiple bombs and torpedo strikes. However, design faults and poor damage control allowed it to be sunk with one torpedo from the USS Albacore on June 19, 1944
Shinano-class		Aircraft carrier	Shinano (1944–1944)	65,800 tonnes	Initially laid down as the third of the Yamato-class battleships, Shinano was converted into an aircraft carrier due to the Japanese defeat at Midway. She was sunk on November 29, 1944, by torpedoes from USS Archerfish.

Light carriers

Light Aircraft Carrier (9)
Class	Picture	Type	Ships	Displacement	Note
Hōshō-class		Light aircraft carrier	Hōshō (1922–1945)	7,470 tonnes	First purpose-built carrier in the world. Scrapped 1946.
Ryūjō-class		Light aircraft carrier	Ryūjō (1931–1942)	8,000 tonnes	Sunk 1942.
Hiyō-class		Light aircraft carrier	Hiyō (1942–1944) Jun'yō (1942–1946)	24,150 tonnes	Converted from an ocean liner in 1939. Hiyō sunk and Jun'yō scrapped 1946–1947.
Zuihō-class		Light aircraft carrier	Zuihō (1940–1944) Shōhō (1939–1942)	11,443 tonnes	Both sunk during WWII.
Chitose-class		Light aircraft carrier	Chitose (1938/1944–1944) Chiyoda (1938/1944–1944)	11,200 tonnes	Both ships were seaplane tenders before their conversion in 1943. Both ships sunk in 1944.
Ryūhō-class		Light aircraft carrier	Ryūhō (1934/1942–1945)	16,700 tonnes	Converted from the submarine tender Taigei 1941–1942. Recommissioned as Ryūhō 1942. Scrapped 1946.

Escort carriers

Escort Carrier (10)
Class	Picture	Type	Ships	Displacement	Note
Taiyō-class		Escort carrier	Taiyō (1941–44) Chūyō (1942–43) Unyō (1942–44)	17,830 tonnes	All sunk.
Kaiyō-class		Escort carrier	Kaiyō (1943–1945)	13,600 tonnes. Converted from ocean liner Argentina Maru.	Scrapped 1946.
Shin'yō-class		Escort carrier	Shin'yō (1943–1944)	17,500 tonnes
Akitsu Maru-class		Escort carrier	Akitsu Maru (1942–1944) Nigitsu Maru (1942–1944)	11,800 tonnes	Operated by the Imperial Japanese Army. Worlds' first Amphibious Assault ships.
Shimane Maru-class		Escort carrier	Shimane Maru (1945–1945)	11,989 tonnes
Yamashio Maru-class		Escort carrier	Yamashio Maru (1945–1945)	16,119 tonnes
Kumano Maru-class		Escort carrier	Kumano Maru (1945–1945)	8,258 tonnes	Operated by Imperial Japanese Army.

Seaplane tenders

Seaplane Tender (9)
Class	Picture	Type	Ships	Displacement	Note
Nisshin-class		Seaplane tender	Nisshin (1942–1943)	11,499 tonnes	Also midget submarine carrier and minelayer
Kamikawa Maru-class		Seaplane tender	Kamikawa Maru (1937–1943) Kiyokawa Maru (1941–1946) Kimikawa Maru (1937–1944) Kunikawa Maru (1937–1945)	6,862 tonnes	Hirokawa Maru of the same class was converted to auxiliary (anti-aircraft) cruiser instead of seaplane tender when impressed for Navy service
Akitsushima-class		Seaplane tender	Akitsushima (1942–1944)	4,725 tonnes
Kamoi-class		Seaplane tender	Kamoi (1922–1947)	17,273 tonnes
Notoro-class		Seaplane tender	Notoro (1934–1947)	15,647 tonnes	Of 7 oilers in class, Notoro was converted to seaplane tender and Shiretoko to munition ship
Mizuho-class		Seaplane tender	Mizuho (1939–1942)	10,930 tonnes	Also midget submarine carrier

Armoured vessels

Battlecruisers

Fast Battleship (4) - former battlecruisers
Class	Picture	Type	Ships in class	Displacement	Main battery	Note
Kongō-class		Fast battleship	Kongō (1913–1944) Hiei (1914–1942) Kirishima (1915–1942) Haruna (1915–1945)	32,156 tonnes	8 × 14-inch	Laid down and commissioned as Battlecruisers in early 20th century, remodelled into Battleships because of Washington Naval Treaty in the late 20' and into Fast Battleships in 1935, allowing them to accompany growing carrier force. All four were sunk during the war

Battleships

Battleship (8)
Class	Picture	Type	Ships	Displacement	Note
Fusō-class		Battleship	Fusō (1915–1944) Yamashiro (1917–1944)	29,330 tonnes	There was a plan to convert these ships into Aviation Battleships in 1943. The plan was cancelled and the two Ise-class battleships were converted instead.
Ise-class		Battleship	Ise (1917–1945) Hyūga (1918–1945)	27,384 tonnes	Converted into Aviation Battleship in 1943.
Nagato-class		Battleship	Nagato (1920–1945) Mutsu (1921–1943)	32,720 tonnes	Both ships underwent significant modernization on 1934–1936, rebuilding the superstructure into the more familiar pagoda mast style.
Yamato-class		Battleship	Yamato (1941–1945) Musashi (1942–1944)	69,988 tonnes	5 planned, 1 converted into an Aircraft carrier, 2 cancelled. Yamato was sunk during a one-way trip to Okinawa during operation Ten-Go. She never saw action there and was sunk by aircraft on the way.

Heavy cruisers

Heavy Cruiser (18)
Class	Picture	Type	Ships	Displacement	Note
Furutaka-class		Heavy cruiser	Furutaka (1926–1942) Kako (1926–1942)	7,100 tonnes
Aoba-class		Heavy cruiser	Aoba (1927–1945) Kinugasa (1927–1942)	7,100 tonnes	Variation of the Furutaka class
Myōkō-class		Heavy cruiser	Myōkō (1929–1945) Nachi (1928–1944) Haguro (1929–1945) Ashigara(1929–1945)	11,633 tonnes
Takao-class		Heavy cruiser	Takao Atago Maya Chōkai	11,633 tonnes	Variation of the Myōkō class
Mogami-class		Heavy cruiser	Mogami Mikuma Suzuya Kumano	8,500 tonnes	Suzuya and Kumano were considered to be a sub-class. Mogami was considered to be an Aviation Cruiser by the IJN (1943).
Tone-class		Heavy cruiser	Tone Chikuma	11,213 tonnes	Considered as Aviation Cruisers by IJN

Light cruisers

Light Cruiser (26)
Class	Picture	Type	Ships	Displacement	Note
Tenryū-class		Light cruiser	Tenryū Tatsuta	3,948 tonnes
Kuma-class		Light cruiser	Kuma Tama Kitakami Ōi Kiso	5,500 tonnes	Kitakami, Ōi and Kiso later converted to a torpedo cruiser under a short-lived Imperial Japanese Navy program.
Nagara-class		Light cruiser	Nagara Isuzu Yura Natori Kinu Abukuma	5,570 tonnes
Yūbari-class		Light cruiser	Yūbari	2,890 t tonnes	An experimental light cruiser.
Sendai-class		Light cruiser	Sendai Jintsu Naka	5,195 tonnes	8 planned; 5 cancelled.
Katori-class		Light cruiser	Katori Kashima Kashii	5,890 tonnes	4 planned; 1 cancelled. Originally served as a training ship.
Agano-class		Light cruiser	Agano Noshiro Yahagi Sakawa	6,652 tonnes
Ōyodo-class		Light cruiser	Ōyodo	8,164 tonnes	2 planned; 1 cancelled.
Yasoshima-class		Light cruiser	Yasoshima Ioshima	2,448 tonnes	Served under the Republic of China Navy under the name of Ping Hai, until seized and re-floated in 1938 by IJN, having been sunk the year before.

Destroyers

Destroyers

Destroyer (169)
Class	Picture	Type	Ships	Displacement	Note
Momi-class		Destroyer	Momi | Kaya | Nashi | Take | Kaki | Tsuga | Nire | Kuri | Kiku | Aoi | Hagi | Fuji | Susuki | Hishi | Hasu | Warabi | Tade | Sumire | Tsuta | Ashi | Yomogi	850 tonnes	28 vessel planned 21 completed. 7 re-ordered as the new Wakatake-class. Relegated to mostly secondary roles.
Minekaze-class		Destroyer	Minekaze | Sawakaze | Okikaze | Shimakaze | Nadakaze | Yakaze | Hakaze | Shiokaze | Akikaze | Yūkaze | Tachikaze | Hokaze | Nokaze | Namikaze | Numakaze	1,345 tonnes
Wakatake-class		Destroyer	Wakatake | Kuretake | Sanae | Sawarabi | Asagao | Yūgao | Fuyō | Karukaya	900 tonnes	23 vessel planned 8 completed. Relegated to mostly secondary roles.
Kamikaze-class		Destroyer	Kamikaze | Asakaze | Harukaze | Matsukaze | Hatakaze | Oite | Hayate | Asanagi | Yūnagi	1,400 tonnes
Mutsuki-class		Destroyer	Mutsuki Kisaragi Yayoi Uzuki Satsuki Minazuki Fumizuki Nagatsuki Kikuzuki Mikazuki Mochizuki Yūzuki	1,315 tonnes
Fubuki-class		Destroyer	Fubuki Shirayuki Hatsuyuki Miyuki Murakumo Shinonome Usugumo Shirakumo Isonami Uranami	1,750 tonnes
Ayanami-class		Destroyer	Ayanami Shikinami Asagiri Yūgiri Amagiri Sagiri Oboro Akebono Sazanami Ushio	1,750 tonnes	Also known as Type II Fubuki-class.
Akatsuki-class		Destroyer	Akatsuki Hibiki Ikazuchi Inazuma	1,750 tonnes	Also known as Type III Fubuki-class.
Hatsuharu-class		Destroyer	Hatsuharu Nenohi Wakaba Hatsushimo Ariake Yūgure	1,530 tonnes
Shiratsuyu-class		Destroyer	Shiratsuyu Shigure Murasame Yūdachi Harusame Samidare Umikaze Yamakaze Kawakaze Suzukaze	1,685 tonnes
Asashio-class		Destroyer	Asashio | Ōshio | Michishio | Arashio | Natsugumo | Yamagumo | Minegumo | Asagumo | Arare | Kasumi	1,685 tonnes
Kagerō-class		Destroyer	Kagerō | Shiranui | Kuroshio | Oyashio | Hayashio | Natsushio | Hatsukaze | Yukikaze | Amatsukaze | Tokitsukaze | Urakaze | Isokaze | Hamakaze | Tanikaze | Nowaki | Arashi | Hagikaze | Maikaze | Akigumo	2,000 tonnes	Called Destroyer Type-A by IJN.
Yūgumo-class		Destroyer	Yūgumo | Makigumo | Kazagumo | Naganami | Makinami | Takanami | Ōnami | Kiyonami | Tamanami | Suzunami | Fujinami | Hayanami | Hamanami | Okinami | Kishinami | Asashimo | Hayashimo | Akishimo | Kiyoshimo	2,077 tonnes	Called Destroyer Type-A by IJN.
Akizuki-class		Destroyer	Akizuki | Teruzuki | Suzutsuki | Hatsuzuki | Niizuki | Wakatsuki | Shimotsuki	2,700 tonnes
Fuyutsuki-class		Destroyer	Fuyutsuki Harutsuki Yoizuki Natsuzuki	2,700 tonnes	Akizuki-subclass.
Michitsuki-class		Destroyer	Hanazuki	2,700 tonnes	16 vessel planned however only 1 completed. Akizuki-subclass.
Shimakaze-class		Destroyer	Shimakaze	2,570 tonnes	She was an experimental destroyer, with new high-temperature, high-pressure steam turbines and mounting a total of 15 torpedo tubes. Also called Type-C by IJN.
Matsu-class		Destroyer	Matsu | Take | Ume | Momo | Kuwa | Kiri | Sugi | Maki | Momi | Kashi | Kaya | Nara | Sakura | Yanagi | Tsubaki | Hinoki | Kaede | Keyaki	1,260 tonnes
Tachibana-class		Destroyer	Tachibana | Kaki | Kaba | Tsuta | Hagi | Sumire | Kusunoki | Hatsuzakura | Nire | Nashi | Shii | Enoki | Odake | Hatsuume	1,350 tonnes	Matsu-subclass.

Torpedo boats

Torpedo Boat (12)
Class	Picture	Type	Boats	Displacement	Note
Chidori-class		Torpedo boat	Chidori | Manazuru | Tomozuru | Hatsukari	600 tonnes	20 vessel planned however only 4 completed. 16 replaced by Ōtori-class.
Ōtori-class		Torpedo boat	Ōtori | Hiyodori | Hayabusa | Kasasagi | Kiji | Kari | Sagi | Hato |	960 tonnes	16 vessel planned however only 8 completed.

Destroyer escorts (Kaibōkan)

Kaibōkan (178)
Class	Picture	Type	Boats	Displacement	Note
Shimushu-class		Kaibōkan	Shimushu | Kunashiri | Ishigaki | Hachijo	874 tonnes
Etorofu-class		Kaibōkan	Etorofu | Matsuwa | Sado | Oki | Mutsure | Iki | Tsushima | Wakamiya | Hirato | Fukae | Amakusa | Manju | Kanju | Kasado	884 tonnes
Mikura-class		Kaibōkan	Mikura | Miyake | Awaji | Nomi | Kurahashi | Yashiro | Chiburi | Kusagaki	955 tonnes
Ukuru-class		Kaibōkan	Ukuru | Hiburi | Shonan | Daito | Okinawa | Kume | Ikuna | Shinnan | Yaku | Aguni | Mokuto | Inagi | Uku | Chikubu | Habushi | Sakito | Kuga | Ojika | Kozu | Kanawa | Shiga | Amami | Hodaka | Habuto | Iwo | Takane | Ikara | Shisaka | Ikuno	955 tonnes	Includes the 9 vessels of the Hiburi subclass
Type C-class		Kaibōkan	CD-1 | CD-3 | CD-5 | CD-7 | CD-9 | CD-11 | CD-13 | CD-15 | CD-17 | CD-19 | CD-21 | CD-23 | CD-25 | CD-27 | CD-29 | CD-31 | CD-33 | CD-35 | CD-37 | CD-39 | CD-41 | CD-43 | CD-45 | CD-47 | CD-49 | CD-51 | CD-53 | CD-55 | CD-57 | CD-59 | CD-61 | CD-63 | CD-65 | CD-67 | CD-69 | CD-71 | CD-73 | CD-75 | CD-77 | CD-79 | CD-81 | CD-85 | CD-87 | CD-95 | CD-97 | CD-105 | CD-107 | CD-205 | CD-207 | CD-213 | CD-215 | CD-217 | CD-219 | CD-221 | CD-225 | CD-227	757 tonnes
Type D-class		Kaibōkan	CD-2 | CD-4 | CD-6 | CD-10 | CD-12 | CD-14 | CD-16 | CD-18 | CD-20 | CD-22 | CD-24 | CD-26 | CD-28 | CD-30 | CD-32 | CD-34 | CD-36 | CD-38 | CD-40 | CD-42 | CD-44 | CD-46 | CD-48 | CD-50 | CD-52 | CD-54 | CD-56 | CD-58 | CD-60 | CD-64 | CD-66 | CD-68 | CD-70 | CD-72 | CD-74 | CD-76 | CD-78 | CD-80 | CD-82 | CD-84 | CD-102 | CD-104 | CD-106 | CD-112 | CD-116 | CD-118 | CD-124 | CD-126 | CD-130 | CD-132 | CD-134 | CD-138 | CD-142 | CD-144 | CD-150 | CD-154 | CD-156 | CD-158 | CD-160 | CD-186 | CD-190 | CD-192 | CD-194 | CD-196 | CD-198 | CD-200 | CD-202 | CD-204	752 tonnes

Patrol boats

Patrol Boat
Class	Picture	Type	Boats	Displacement	Note
No.1-class auxiliary patrol boat		Patrol boat	PBa-1 | PBa-2 | PBa-3 | PBa-25 | PBa-26 | PBa-31 | PBa-37 | PBa-51 | PBa-84 | PBa-90 | PBa-134 | PBa-135 | PBa-136 | PBa-137 | PBa-138 | PBa-152 | PBa-153 | PBa-163 | PBa-164 | PBa-165 | PBa-166 | PBa-173 | PBa-174 | PBa-175 | PBa-179 | PBa-191 | PBa-192	238 tons	280 planned, 27 completed

Submarine chasers

Submarine chaser
Class	Picture	Type	Boats	Displacement	Note
No.1-class auxiliary submarine chaser		Submarine chaser	Cha-1 | Cha-2 | Cha-3 | Cha-4 | Cha-5 | Cha-6 | Cha-7 | Cha-8 | Cha-9 | Cha-10 | Cha-11 | Cha-12 | Cha-13 | Cha-14 | Cha-15 | Cha-16 | Cha-17 | Cha-18 | Cha-19 | Cha-20 | Cha-21 | Cha-22 | Cha-23 | Cha-24 | Cha-25 | Cha-26 | Cha-27 | Cha-28 | Cha-29 | Cha-30 | Cha-31 | Cha-32 | Cha-33 | Cha-34 | Cha-35 | Cha-36 | Cha-37 | Cha-38 | Cha-39 | Cha-40 | Cha-41 | Cha-42 | Cha-43 | Cha-44 | Cha-45 | Cha-46 | Cha-47 | Cha-48 | Cha-49 | Cha-50 | Cha-51 | Cha-52 | Cha-53 | Cha-54 | Cha-55 | Cha-56 | Cha-57 | Cha-58 | Cha-59 | Cha-60 | Cha-61 | Cha-62 | Cha-63 | Cha-64 | Cha-65 | Cha-66 | Cha-67 | Cha-68 | Cha-69 | Cha-70 | Cha-71 | Cha-72 | Cha-73 | Cha-74 | Cha-75 | Cha-76 | Cha-77 | Cha-78 | Cha-79 | Cha-80 | Cha-81 | Cha-82 | Cha-83 | Cha-84 | Cha-85 | Cha-86 | Cha-87 | Cha-88 | Cha-89 | Cha-90 | Cha-91 | Cha-92 | Cha-93 | Cha-94 | Cha-95 | Cha-96 | Cha-97 | Cha-98 | Cha-99 | Cha-100 | Cha-151 | Cha-152 | Cha-153 | Cha-154 | Cha-155 | Cha-156 | Cha-157 | Cha-158 | Cha-159 | Cha-160 | Cha-161 | Cha-162 | Cha-163 | Cha-164 | Cha-165 | Cha-166 | Cha-167 | Cha-168 | Cha-169 | Cha-170 | Cha-171 | Cha-172 | Cha-173 | Cha-174 | Cha-175 | Cha-176 | Cha-177 | Cha-178 | Cha-179 | Cha-180 | Cha-181 | Cha-182 | Cha-183 | Cha-184 | Cha-185 | Cha-186 | Cha-187 | Cha-188 | Cha-189 | Cha-190 | Cha-191 | Cha-192 | Cha-193 | Cha-194 | Cha-195 | Cha-196 | Cha-197 | Cha-198 | Cha-199 | Cha-200 | Cha-201 | Cha-202 | Cha-203 | Cha-204 | Cha-205 | Cha-206 | Cha-207 | Cha-208 | Cha-209 | Cha-210 | Cha-211 | Cha-212 | Cha-213 | Cha-214 | Cha-215 | Cha-216 | Cha-217 | Cha-218 | Cha-219 | Cha-220 | Cha-221 | Cha-222 | Cha-223 | Cha-224 | Cha-225 | Cha-226 | Cha-227 | Cha-228 | Cha-229 | Cha-230 | Cha-231 | Cha-232 | Cha-233 | Cha-234 | Cha-235 | Cha-236 | Cha-237 | Cha-238 | Cha-239 | Cha-240 | Cha-241 | Cha-242 | Cha-243 | Cha-244 | Cha-245 | Cha-246 | Cha-247 | Cha-248 | Cha-249 | Cha-250	130 tons	200 planned, 200 completed

Submarine

Submarine (213)
Class	Picture	Type	Boats	Displacement	Note
I-1-class		Submarine	I-1 | I-2 | I-3 | I-4 | I-5 | I-6 | I-7 | I-8	1,970 tonnes	The official designation of the submarine was Junsen-type submarine
I-9-class		Submarine	I-9 | I-10 | I-11 | I-12 | I-13 | I-14	2,434 tonnes	The official designation of the submarine was Type A (Ko) submarine.
I-15-class		Submarine	I-15 | I-17 | I-19 | I-21 | I-23 | I-25 | I-26 | I-27 | I-29 | I-30 | I-31 | I-32 | I-33 | I-34 | I-35 | I-36 | I-37 | I-38 | I-39 | I-40 | I-41 | I-42 | I-43 | I-44 | I-45 | I-54 | I-56 | I-58	2,184 tonnes	The official designation of the submarine was Type B (Otsu) submarine.
I-16-class		Submarine	I-16 | I-18 | I-20 | I-22 | I-24 | I-46 | I-47 | I-48 | I-52 | I-53 | I-55	2,184 tonnes	The official designation of the submarine was Type C (Hei) submarine.
I-361-class		Submarine	I-361 | I-362 | I-363 | I-364 | I-365 | I-366 | I-367 | I-368 | I-369 | I-370 | I-371 | I-372 | I-373	1,440 tonnes	The official designation of the submarine was Type D (Tei) submarine
I-51-class		Submarine	I-51 | I-152 | I-153 | I-154 | I-155 | I-156 | I-157 | I-158 | I-159 | I-60 | I-63 | I-61 | I-162 | I-164 | I-165 | I-66 | I-67 | I-168 | I-169 | I-70 | I-171 | I-73 | I-174 | I-175 | I-176 | I-177 | I-178 | I-179 | I-180 | I-181 | I-182 | I-183 | I-184 | I-185	1,575 tonnes	The official designation of the submarine was Kaidai-type submarine
I-121-class		Submarine	I-121 | I-122 | I-123 | I-124	1,142 tonnes	The official designation of the submarine was Kiraisen-type submarine
I-351-class		Submarine	I-351	3,512 tonnes	Planned 6. Completed 1. The official designation of the submarine was Senho-type submarine
I-201-class		Submarine	I-201 I-202 I-203	1,503 tonnes	The official designation of the submarine was Sentaka-type submarine
I-501-class		Submarine	I-501	1,616 tonnes	Was German Kriegsmarine submarine under the name U-181, until given to Japan May 1945.
I-502-class		Submarine	I-502	1,610 tonnes	Was German Kriegsmarine submarine under the name U-862, until given to Japan May 1945.
I-503-class		Submarine	I-503	1,610 tonnes	Was a Regia Marina submarine under the name Comandante Cappelini then captured by IJN after Italy's capitulation then given to Kriegsmarine in September 1943 under the name UIT-24. After that captured again by IJN in May 1945 after Nazi-Germany's surrender.
I-504-class		Submarine	I-504	1,763 tonnes	Was Regia Marina submarine under the name Luigi Torelli then it was temporarily interned to IJN after Italy's capitulation then given to Kriegsmarine in September 1943 under the name UIT-25. After that captured again by IJN in May 1945 after Nazi-Germany's surrender.
I-505-class		Submarine	I-505	1,763 tonnes	Was German Kriegsmarine submarine under the name U-219, until given to Japan May 1945.
I-506-class		Submarine	I-506	1,610 tonnes	Was German Kriegsmarine submarine under the name U-195, until given to Japan May 1945.
Ro-11-class		Submarine	Ro-11 | Ro-12 | Ro-13 | Ro-14 | Ro-15 | Ro-16 | Ro-17 | Ro-18 | Ro-19 | Ro-20 | Ro-21 | Ro-22 | Ro-23 | Ro-24 | Ro-25 | Ro-26 | Ro-27 | Ro-28 | Ro-29 | Ro-30 | Ro-31 | Ro-32 | Ro-33 | Ro-34 | Ro-35 | Ro-36 | Ro-37 | Ro-37 | Ro-38 | Ro-39 | Ro-40 | Ro-41 | Ro-42 | Ro-43 | Ro-44 | Ro-45 | Ro-46 | Ro-47 | Ro-48 | Ro-49 | Ro-50 | Ro-55 | Ro-56	720 tonnes	The official designation of the submarine was Type Kaichū submarine.
Ro-51-class		Submarine	Ro-51 | Ro-52 | Ro-53 | Ro-54 | Ro-55 | Ro-56 | Ro-57 | Ro-58 | Ro-59 | Ro-60 | Ro-61 | Ro-62 | Ro-63 | Ro-64 | Ro-65 | Ro-66 | Ro-67 | Ro-68	893 tonnes	The official designation of the submarine was Type L submarine
Ro-100-class		Submarine	Ro-100 | Ro-101 | Ro-102 | Ro-103 | Ro-104 | Ro-105 | Ro-106 | Ro-107 | Ro-108 | Ro-109 | Ro-110 | Ro-111 | Ro-112 | Ro-113 | Ro-114 | Ro-115 | Ro-116 | Ro-117	525 tonnes
Ha-201-class		Submarine	Ha-201 | Ha-202 | Ha-203 | Ha-204 | Ha-205 | Ha-207 | Ha-208 | Ha-209 | Ha-210 | Ha-216	320 tonnes	Never saw combat The official designation of the submarine was Sentaka-Shō type submarine.
Ro-500-class		Submarine	Ro-500	1,120 tonnes	Was German Kriegsmarine submarine under the name U-511, until given to Japan 16 September 1943.
Ro-501-class		Submarine	Ro-501	1,144 tonnes	Was German Kriegsmarine submarine under the name U-1224, until given to Japan 15 February 1944.

Submarine aircraft carrier (3)
Class	Picture	Type	Boats	Displacement	Note
I-400-class		Submarine aircraft carrier	I-400 I-401 I-402	6,560 tonnes	The official designation of the submarine was Sentoku type Submarine.

Transport Submarine (49)
Class	Picture	Type	Boats	Displacement	Note
Ha-101-class		Transport submarine	Ha-101 | Ha-102 | Ha-103 | Ha-104 | Ha-105 | Ha-106 | Ha-107 | Ha-108 | Ha-109 | Ha-111	370 tonnes	The official designation of the submarine was Sen'yu type submarine
Yu-class		Transport submarine	Yu-1 | Yu-2 | Yu-3 | Yu-4 | Yu-5 | Yu-6 | Yu-7 | Yu-8 | Yu-9 | Yu-10 | Yu-11 | Yu-12 | Yu-13 | Yu-14 | Yu-15 | Yu-16 | Yu-17 | Yu-18 | Yu-19 | Yu-20 | Yu-21 | Yu-22 | Yu-23 | Yu-24 | Yu-1001 | Yu-1002 | Yu-1003 | Yu-1005 | Yu-1006 | Yu-1007 | Yu-1008 | Yu-1009 | Yu-1010 | Yu-2001 | Yu-2002 | Yu-3001 | Yu-3002 | Yu-3003	274 tonnes	Used by Imperial Japanese Army.

Submarine tender

Submarine Tender (3)
Class	Picture	Type	Ships	Displacement	Note
Jingei-class		Submarine tender	Jingei Chōgei	6,240 tonnes
Taigei-class		Submarine tender	Taigei	16,700 tonnes	Converted into Light aircraft carrier.

Gunboats

Gunboats (20)
Class	Picture	Type	Ships	Displacement	Note
Japanese gunboat Saga		River gunboat	Saga	793	Improvement of Uji (1903)
Hashidate-class		Gunboat	Hashidate Uji	1,009
Japanese gunboat Ataka		River gunboat	Ataka	880
Fushimi-class		River gunboat	Fushimi Sumida	356
Luzon-class		River gunboat	Karatsu	509	Salvaged from the US wreck
USS Wake (PR-3)		River gunboat	Tatara	360	The only US ship surrendered to Japanese during World War II
Azio-class		Gunboat	Okitsu	625	Salvaged from the Italian wreck
Insect-class		River gunboat	Suma	635	Salvaged from the British wreck
Atami-class		River gunboat	Atami Futami	249
Seta-class		River gunboat	Seta Katata Hira Hozu	343
Japanese gunboat Kotaka		River gunboat	Kotaka	57	Simplified Atami-class gunboat for shallow water (0.64m draft) operations
Japanese gunboat Toba		River gunboat	Toba	220
Kozakura-class		River gunboat	Kozakura Shiraume	30
Shōkai Maru-class		Gunboat	Shōkai Maru Eikai Maru		Official designation was a high-powered tugboat, however, they did not have any towing facilities. They were actually gunboats and escort ships.

Mine warfare vessels

Minesweepers (35), minelayers (33) and netlayers (1)
Class	Picture	Type	Ships	Displacement, tonnes	Note
Hatsutaka-class		Minelayer	Hatsutaka Aotaka Wakataka	1,626
Japanese minelayer Shirataka		Netlayer	Shirataka	1,540
Japanese cruiser Tokiwa		Minelayer	Tokiwa	9,667	Converted to minelayer in 1922
Japanese minelayer Itsukushima		Minelayer	Itsukushima	2,002	First ever Japanese Navy diesel ship
Kamishima-class		Minelayer	Kamishima Awashima	778
Japanese survey ship Katsuriki		Minelayer	Katsuriki	1,565	First purpose-built ocean-going minelayer of Japanese Navy, converted to survey ship in 1942
Japanese minelayer Minoo		Minelayer	Minoo	3,276
Japanese minelayer Okinoshima		Minelayer	Okinoshima	4,359	Carry a reconnaissance floatplane
Natsushima-class		Minelayer	Natsushima Nasami Sarushima	483
Tsubame-class		Minelayer	Tsubame Kamome	457
Sokuten-class		Minelayer	Toshima | Kuroshima | Ashizaki | Katoku | Entō | Kurokami | Katashima | Enoshima | Ninoshima | Kurosaki | Washizaki	411	2 prototypes of this class decommissioned before World War II
MV Tenyo Maru (1935)		Minelayer	Tenyo Maru	6,843
Japanese minelayer Tsugaru		Minelayer	Tsugaru	4,064	Carry a reconnaissance floatplane
Japanese minelayer Yaeyama		Minelayer	Yaeyama	1,153	Refit as anti-submarine warfare vessel in 1943
Hashima-class		Minelayer	Hashima | Tsurushima | Ōtate | Tateishi	1,585	Used to lay remote-controlled mines in coastal fortifications
W-1-class		Minesweeper	W-1 | W-2 | W-3 | W-4 | W-5 | W-6	610
W-7-class		Minesweeper	W-7 | W-8 | W-9 | W-10 | W-11 | W-12	640	Actually newer than W-13 class
W-13-class		Minesweeper	W-13 | W-14 | W-15 | W-16 | W-17 | W-18	533
W-19-class		Minesweeper	W-19 | W-20 | W-21 | W-22 | W-23 | W-24 | W-25 | W-26 | W-27 | W-28 | W-29 | W-30 | W-33 | W-34 | W-39 | W-41	658	Primary Japanese minesweeper during World War II
Wa-1-class auxiliary minesweeper		Minesweeper	Wa-1 | Wa-2 | Wa-3 | Wa-4 | Wa-5 | Wa-6 | Wa-7 | Wa-8 | Wa-9 | Wa-10 | Wa-11 | Wa-12 | Wa-13 | Wa-14 | Wa-15 | Wa-16 | Wa-17 | Wa-18 | Wa-19 | Wa-20 | Wa-21 | Wa-22

Auxiliary vessels

Food Supply Ship

Food Supply Ship (8)
Class	Picture	Type	Ships	Displacement	Note
Mamiya-class		Food supply ship	Mamiya	15,820 tonnes
Ekkai-class		Food supply ship	Ekkai Maru	2,984 tonnes	Originally belonging to Honduras, he was captured in Shanghai the same day the country declared war on Japan.
Nosaki-class		Food supply ship	Nosaki	650 tonnes
Kinesaki-class		Food supply ship	Kinesaki Hayasaki Shirasaki Arasaki	910 tonnes
Irako-class		Food supply ship	Irako	9,570 tonnes
Kurasaki-class		Food supply ship	Kurasaki
Muroto-class		Food supply ship	Muroto	8,125 tonnes
Kitakami-Maru-class		Food supply ship	Kitakami-Maru	498 tonnes

Repair ship

Repair Ship (2)
Class	Picture	Type	Ships	Displacement	Note
Asahi-class		Repair ship	Asahi	15,200 tonnes	Converted from Pre-dreadnought battleship.
Akashi-class		Repair ship	Akashi	9,000 tonnes

Survey ship

Survey Ships (1)
Class	Picture	Type	Ships	Displacement	Note
Tsukushi-class		Survey ship	Tsukushi	1,422 tonnes	Planned 2. Cancelled 1.

See also

• Imperial Japanese Navy of World War II
• List of Japanese military equipment of World War II
• List of ships of the Japanese Navy
• List of ships of the Second World War