List of codenames of naval and land based operations in the Pacific Theater during World War II including Japan, Oceania, and the Pacific Rim.

Axis

• A-Go (1944) — plan to engage and destroy the U.S. Fleet during the Saipan landings
• AL (1942) — invasion of the western Aleutians as a diversion from the attempted invasion of Midway Island
  • AOB (1942) — seizure of Kiska Island
  • AQ (1942) — seizure of Attu Island
  • Ke-Go (1943) — evacuation of Kiska, Aleutians
• Nauru (1940) two German attacks on Nauru Island
  • First Attack (1940) sinking of five British, Australian and Norwegian boats
  • Second Attack (1940) bombardment of Nauru
• I-Go (1943) — major 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) — reconnaissance and air-raid on Pearl Harbor
• Ka (1942) — plan to destroy the U.S. Fleet and recapture Guadalcanal
• Ke (1943) — evacuation of Guadalcanal
• Ketsu-Go (Decisive) (1945) — plan to counter U.S.-led invasion of Japan
• MI (1942) — attempted seizure of Midway Island
• Mo (1942) — aborted invasion of Port Moresby in New Guinea
• RE (1942) — attempt to take Allied airfields on Milne Bay in New Guinea
• RO (1943) — reinforcement of air forces at Rabaul
• Sho-Go (1945) — naval reaction to U.S. invasion of Leyte
• SR (1942) — seizure of Lae and Salamaua in southeast New Guinea
• TA (1944) — attempt to repulse U.S. beachhead on Bougainville Island
• Tan No. 2 (1945) — long-range Kamikaze mission on Allied fleet anchorage at Ulithi atoll
• TEN (1945) — air defense plan for Japan
• Ten-Go (1945) — kikusui attacks and naval sortie to defend Okinawa.
• Z (1941) — the Japanese attack on Pearl Harbor

Allies

• Baus Au (1942) — plan to hide materiel in the Philippines before the fall for later use in guerilla warfare
• Cartwheel (1943–1944) — Major offensives in the South West Pacific Area, aimed at isolating the major Japanese base at Rabaul
  • Chronicle (1943) — landings at Woodlark Island and Kiriwina, New Guinea
  • Toenails (1943) — landings at New Georgia
  • Postern (1943) — assault on Lae, Papua New Guinea.
  • Goodtime (1943) — New Zealand landing at Treasury Islands.
  • Blissful (1943) — landing at Choiseul Island.
  • Cherry Blossom (1943) — landing at Bougainville Island.
  • Dexterity (1943–1944) — landings at Arawe, Cape Gloucester and Saidor and the capture of Tuvulu aerodrome, on New Britain
• Causeway (planned for 1945, not executed) — planned invasion of Formosa (Taiwan); scrapped in favour of Operation Detachment
• Cleanslate (1943) — landings on the Russell Islands
• Cottage (1943) — operation to recapture Kiska in the Aleutians
• Cyclone (1944) — airborne landings on Noemfoor, Dutch New Guinea
• Detachment (1945) — 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) — reinforcement and airfield construction at Milne Bay, Papua New Guinea.
• Ferdinand (1942) — coastwatchers on Japanese-occupied islands
• Flintlock (1944) — assault on Marshall Islands.
  • Catchpole (1944) — invasion of Eniwetok
  • Hailstone (1944) — naval air attack on Truk
• Forager (1944) — assault on Marianas Islands
• Galvanic (1943) — assault on Gilbert Islands
• Gratitude (1945) — US Navy raid into the South China Sea
• Iceberg (1945) — invasion of Okinawa
• Inmate (1945) — naval bombardment of Truk
• Juneau (1945) — minesweeping operations at Okinawa.
• Lentil (1945) — air attack on Pangkalan Brandan, eastern Sumatra
• Majestic (planned for 1945, not executed) — planned Allied invasion of Kyushu. Scrapped in favor of Operation Olympic (under Operation Downfall)
• Meridian (1945) — air attack on Palembang
• Oboe (1945) — assault on Borneo
• PM (1945) — removal of defensive minefield off Auckland, New Zealand
• Sandcrab (1943) — operation to recapture Attu in the Aleutians
• Starvation (1945) — aerial mining of Japanese ports and waterways
• Stalemate (1944) — assault on Peleliu and Palau Islands
• Vengeance (1943) — assassination of Japanese Admiral Isoroku Yamamoto
• Watchtower (1942) — invasion of Guadalcanal