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This is a list of known Japanese operations planned, executed or aborted during the Second World War.
| Operation | Year | Description |
|---|---|---|
| Operation FU | 1940 | invasion of French Indo-China |
| Operation AI | 1941 | attack on Pearl Harbor, Hawaii, United States |
| Operation DE | 1941 | invasion of Dutch East Indies |
| Operation T | 1941 | invasion of Thailand |
| Operation E | 1941 | invasion of China and Northeast British Malaya |
| Operation M | 1941 | invasion of the Philippine Islands |
| Operation B | 1941 | invasion of British Borneo and Dutch Borneo |
| Operation AL | 1942 | invasion of the Aleutian Islands, Alaska, United States |
| Operation B | 1942 | invasion of Burma |
| Operation C | 1942 | reconnaissance and raid operations in the Indian Ocean |
| Operation D | 1942 | invasion of the Andaman Islands |
| Operation H | 1942 | invasion of Celebes, Ambon and Timor |
| Operation J | 1942 | invasion of Java, Netherlands East Indies |
| Operation K | 1942 | reconnaissance and air raid on Pearl Harbor, Hawaii, United States |
| Operation Ka | 1942 | plan to destroy the American fleet and recapture Guadalcanal, Solomon Islands |
| Operation L | 1942 | landing operation in Palembang, Sumatra |
| Operation MI | 1942 | aborted invasion of Midway Island |
| Operation MO | 1942 | aborted invasion of Port Moresby, New Guinea |
| Operation R | 1942 | invasion of Rabaul, New Britain and Kavieng, New Ireland |
| Operation SR | 1942 | invasion of Lae and Salamaua, New Guinea |
| ( Operation ? ) | 1942 | attack along the Kokoda track (New Guinea) |
| Operation T | 1942 | invasion of northern Sumatra |
| Operation U | 1942 | invasion of Burma |
| Operation RY | 1942 | invasion of Nauru and Ocean islands |
| Operation KE | 1943 | evacuation of Guadalcanal, Solomon Islands |
| Operation I | 1943 | air raid against Allied advances on New Guinea and Guadalcanal, Solomon Islands |
| Operation SE | 1943 | air raid against Allied forces staging around Guadalcanal area |
| Operation KE (Kiska evacuation) | 1943 | evacuation of Kiska, Aleutian Islands, Alaska, United States |
| Operation RO | 1943 | defensive plan against Allied attacks on Rabaul, New Britain |
| Operation Ta | 1943 | attack on Bougainville in the Solomon Islands |
| Operation A-Go | 1944 | attack of the American fleet off Saipan, Mariana Islands |
| Operation Ban-Go | 1944 | defensive operation at the Irrawaddy River in Burma |
| Operation Dan-Go | 1944 | operation after the failed operation U-Go offensive in India |
| Operation FS | 1944 | cancelled plan to isolate Australia by capturing New Caledonia, Samoa, and Fiji |
| Operation Fu-Go | 1944 | aerial bombing of the United States via balloons |
| Operation Ha-Go | 1944 | action to isolate and destroy Anglo-Indian forces at Arakan, Burma; precursor to operation U-Go |
| Operation Ichi-Go | 1944 | attack in Eastern China to link up Northern China and Indochina |
| Operation Kan-Go | 1944 | defensive plan in Southern Burma |
| Operation Kon | 1944 | defensive operation on Biak Island, New Guinea |
| Operation Sho I | 1944 | attack of the American fleet off Leyte, Philippine Islands; part of operation Sho-Go |
| Operation Sho II | 1944 | defence plan for Formosa and the Ryukyu Islands, Japan; part of operation Sho-Go |
| Operation Sho III | 1944 | defence plan for Honshū, Japan; part of operation Sho-Go |
| Operation Sho IV | 1944 | defence plan for Hokkaido, Japan; part of operation Sho-Go |
| Operation Sho-Go | 1944 | defence plan against American advances toward Japan |
| Operation Ta | 1944 | attack on American forces at Cape Torokina, Bougainville, Solomon Islands |
| Operation TA | 1944 | convoys in and out of the Philippines. |
| Operation Take-Ichi | 1944 | convoys to the Doberai Peninsula in Western New Guinea |
| Operation To-Go | 1944 | phase one of Japanese attack in Eastern China; part of operation Ichi-Go |
| Operation U-Go | 1944 | assault on Imphal and Kohima, India |
| Operation Yu (also Operation Tatsumaki) | 1944 | surprise attack raid on American shipping at Majuro atoll |
| Operation Tatsumaki | 1944 | see Operation Yu |
| Operation Arashi | 1945 | air raid on Ulithi Atoll, Caroline Islands |
| Operation Hikari | 1945 | reconnaissance of Ulithi Atoll, Caroline Islands; part of operation Arashi |
| Operation Ketsu-Go | 1945 | defence plan against potential American invasion of the Japanese home islands |
| Operation Kikusui | 1945 | special attack against American ships off Okinawa, Japan |
| Operation Tan 2 | 1945 | special attack mission against the Allied anchorage at Ulithi, Caroline Islands |
| Operation Ten-Go | 1945 | defence plan in 1945, consisting of four likely scenarios. Operation Ten'ichi-Go, the first scenario in Ten-Go, is a reaction plan against Allied invasion of Okinawa. |
| Operation Ken | 1945 | cancelled operation to use transports to land suicide troops on American airfields in the Mariana Islands |
| Operation Kon-Go | 1945 | cancelled offensive against American ships using manned torpedoes |