This is a list of known World War II era codenames for military operations and missions commonly associated with World War II. As of 2022[update] this is not a comprehensive list, but most major operations that Axis and Allied combatants engaged in are included, and also operations that involved neutral nation states. Operations are categorised according to the theater of operations, and an attempt has been made to cover all aspects of significant events. Operations contained in the Western Front category have been listed by year. Operations that follow the cessation of hostilities and those that occurred in the pre-war period are also included. Operations are listed alphabetically, and where multiple aspects are involved these are listed inline.
Sankō (1942–1944) – Japanese campaign in five provinces of northeastern China to crush the Chinese resistance following the Hundred Regiments Offensive
Rädda Danmark ("Save Denmark") (1945) – Swedish plan to liberate Denmark before the country was occupied by the Soviet Union (cancelled because of German surrender)
Operation Jedburgh (1944) – SOE, OSS, and Free French-Belgian-Dutch exiles parachuted into France, the Netherlands and Belgium to perform guerrilla warfare.
Partisan operations
Includes some operations by regular forces in support of partisans
Jericho (1944) – Allied aircraft bombed Amiens prison in German-occupied France to aid Resistance prison escape
Keelhaul (1945) – forced repatriation to the Soviet Union, by the western Allies, of Soviet prisoners of war
Magic Carpet (1945–1946) – American post-war operation to transport US military personnel home
Manna (1945) – Allied air drops of food to famine-ravaged Netherlands, with German cooperation
Margarethe (1944) – German occupation of Hungary. Döme Sztójay, an avid supporter of the Nazis, became the new Hungarian Prime Minister with the aid of a Nazi military governor.
Operation Walküre ("Valkyrie") (1944) – Plan to deal with general breakdown of civil order within Germany following the death of Hitler and the seizure of power by other Nazi officials or the SS; a cover for clandestine action by the German resistance.
Rainbow War Plans (1920s–30s) – Global US War planning between the World Wars.
Propaganda, war crimes, and genocide
Himmler (1939) – A false flagSS and SD operation. Attacks were made against German buildings, near the Polish-German border, to create the appearance of Polish aggression against Germany. This was to then be used as propaganda to justify the German invasion of Poland.