A-Go (1944) — Japanese plan to engage and destroy the U.S. Fleet during the Saipan landings
AL (1942) — Japanese invasion of the western Aleutians as a diversion from the attempted invasion of Midway Island
AOB (1942) — Japanese seizure of Kiska Island
AQ (1942) — Japanese seizure of Attu Island
Ke-GO (1943) — Japanese evacuation of Kiska, Aleutians
I (1943) — major Japanese air offensive to halt Allied advances on New Guinea and Guadalcanal
FS (1944) — proposal to isolate Australia by capturing New Caledonia, Samoa and Fiji.
K-1 (1942) — Japanese reconnaissance and air-raid on Pearl Harbor
Ka (1942) — Japanese plan to destroy the U.S. Fleet and recapture Guadalcanal
Ke (1943) — Japanese evacuation of Guadalcanal
Ketsu-Go (Decisive) (1945) — Japanese plans to counter US led invasion of Japan
MI (1942) — attempted seizure of Midway Island
MO (1942) — aborted Japanese invasion of Port Moresby in New Guinea
RO (1943) — reinforcement of air forces at Rabaul
Sho-Go (1945) — Japanese naval reaction to US invasion of Leyte
SR (1942) — seizure of Lae and Salamaua in southeast New Guinea
TA (1944) — attempt to repulse US bridgehead on Bougainville Island
Tan No. 2 (1945) — long-range Kamikaze mission on Allied fleet anchorage at Ulithi atoll
TEN (1945) — air defence plan for Japan
Ten-Go (1945) — Japanese kikusui attacks and naval sortie to defend Okinawa.
Z (1941) — the Japanese attack on Pearl Harbor
Baus Au (1942) — plan to hide materiel in the Philippines before the fall for later use in guerilla warfare.
Cartwheel (1943-1944) — Allied thrusts in the South West Pacific Area, aimed at isolating the major Japanese base at Rabaul.
Chronicle (1943) — Allied landings at Woodlark Island and Kiriwina, New Guinea in support of Cartwheel.
Toenails (1943) — Allied landings at New Georgia.
Postern (1943) — Allied assault on Lae, Papua New Guinea.
Goodtime (1943) — New Zealand landing at Treasury Islands.
Blissful (1943) — US landing at Choiseul Island.
Cherry Blossom (1943) — US landing at Bougainville Island.
Dexterity (1943-1944) — Allied landings at Arawe, Cape Gloucester and Saidor and the capture of Tuvulu aerodrome.
Cleanslate (1943) — US landings on the Russell Islands
Cottage (1943) — US and Canadian operation to recapture Kiska in the Aleutians
Cyclone (1944) — US airborne landings on Noemfoor, Dutch New Guinea
Detachment (1945) — US invasion of Iwo Jima
Downfall (1945) — planned invasion of Japan
Olympic (planned for 1945, not executed) — first of two prongs of the invasion of Japan
Coronet (planned for 1946, not executed) — second of two prongs of the invasion of Japan
Fall River (1942) — Allied reinforcement and airfield construction at Milne Bay, Papua New Guinea.
Ferdinand (1942) — coastwatchers on Japanese-occupied islands
Flintlock (1944) — US assault on Marshall Islands.
Catchpole (1944) — US invasion of Eniwetok
Hailstone (1944) — naval air attack on Truk
Forager (1944) — US assault on Marianas Islands.
Galvanic (1943) — US assault on Gilbert Islands.
Gratitude (1945) — US Navy raid into the South China Sea
Iceberg (1945) — US invasion of Okinawa
Inmate (1945) — British and New Zealand naval bombardment of Truk
Juneau (1945) — US minesweeping operations at Okinawa.
Lentil (1945) — air attack by British Pacific Fleet on Pangkalan Brandan, eastern Sumatra
Majestic (planned for 1945, not executed) — Planned Allied invasion of the Japanese Home Island of Kyushu. Scrapped in favour of Operation Olympic (under Operation Downfall)
Meridian (1945) — air attack by British Pacific Fleet on Palembang
Oboe (1945) — Allied assault on Borneo.
PM (1945) — removal of defensive minefield off Auckland, New Zealand
Sandcrab (1943) — US operation to recapture Attu in the Aleutians
Starvation (1945) — American aerial mining of Japanese ports and waterways.
Stalemate (1944) — US assault on Peleliu and Palau Islands
Vengeance (1943) — The assassination of Japanese Admiral Isoroku Yamamoto
Watchtower (1942) — U.S. invasion of Guadalcanal
List of naval and land-based operations in Pacific Theater during World War II Wikipedia
List of codenames of naval and land based operations in the Pacific Theater during World War II including Japan, Oceania, and the Pacific Rim.