
World War III or the Third World War, often abbreviated as WWIII or WW3, are names given to a hypothetical third worldwide large-scale military conflict subsequent to World War I and World War II. The term has been in use since at least as early as 1941. Some apply it loosely to limited or more minor conflicts such as the Cold War or the war on terror. In contrast, others assume that such a conflict would surpass prior world wars in both scope and destructive impact.
The STEN is a family of British submachine guns chambered in 9×19mm which were used extensively by British and Commonwealth forces throughout World War II and the Korean War. They had a simple design and very low production cost, making them effective insurgency weapons for resistance groups, and they continue to see usage to this day by irregular military forces. The Sten served as the basis for the Sterling submachine gun, which replaced the Sten in British service until the 1990s, when it, and all other submachine guns, were replaced by the SA80.

Lists of World War II military equipment are lists of military equipment in use during World War II (1939–1945). They include lists of aircraft, ships, vehicles, weapons, personal equipment and uniforms, and other equipment. There are aggregated military equipment lists by country, and lists of classes of equipment broken down by country or by type.

The Bofors 37 mm anti-tank gun was an anti-tank gun designed by Swedish manufacturer Bofors in the early 1930s originally for Swedish use. It was exported to several countries during the 1930s of which several bought licences to produce it themselves. The gun was used in several conflicts but most of its fame comes from its use in the Spanish Civil War and the Winter War where it was used very successfully against light tanks and armored cars among other targets. Beyond its use as an infantry gun it was also used as the main armament in several armored cars and tanks such as the Dutch M39 Pantserwagen and the Polish 7TP to name a few. As the armor of tanks was increased during World War II the gun very quickly became obsolete as an anti-tank gun but was still used effectively as an infantry support gun for the entirety of the war, and well into the Cold War. This was due to its high fire rate, great mobility and effective high explosive shells.

The Walther PP series pistols are blowback-operated semi-automatic pistols, developed by the German arms manufacturer Carl Walther GmbH Sportwaffen.
This is an index of lists of weapons.

The MP35 was a submachine gun used by the Wehrmacht, Waffen-SS and German police both before and during World War II. It was developed in the early 1930s by Emil Bergmann and manufactured at the Bergmann company in Suhl.
The Picatinny Arsenal is an American military research and manufacturing facility located on 6,400 acres (26 km2) of land in Jefferson and Rockaway Township in Morris County, New Jersey, United States, encompassing Picatinny Lake and Lake Denmark. The Arsenal is the headquarters of the US Army Combat Capabilities Development Command Armaments Center. It is known for developing the ubiquitous Picatinny rail, as well as being the Army's center of expertise for small arms cartridge ammunition.

Seven Days to the River Rhine was a top-secret military simulation exercise developed in 1979 by the Warsaw Pact. It depicted the Soviet bloc's vision of a seven-day nuclear war between NATO and Warsaw Pact forces.

Charles Christian Lauritsen was a Danish/American physicist.

The Flak 30 and improved Flak 38 were 20 mm anti-aircraft guns used by various German forces throughout World War II. It was not only the primary German light anti-aircraft gun but by far the most numerously produced German artillery piece throughout the war. It was produced in a variety of models, notably the Flakvierling 38 which combined four Flak 38 autocannons onto a single carriage.

The United Defense M42, sometimes known as the Marlin for the company that did the actual manufacturing, was an American submachine gun used during World War II. It was produced from 1942 to 1943 by United Defense Supply Corp. for possible issue as a replacement for the Thompson submachine gun and was used by agents of the Office of Strategic Services (OSS). However, its usage was limited, and the Thompson continued to see service until the end of the war, alongside the M3 submachine gun, which was designed around the same time as the M42.
The following outline is provided as an overview of and topical guide to World War II:
This is a list of World War II-related topic lists:

The QF 1 pounder, universally known as the pom-pom due to the sound of its discharge, was a 37 mm British autocannon, the first of its type in the world. It was used by several countries initially as an infantry gun and later as a light anti-aircraft gun.
This is an Index of World War II articles, that can be found on Wikipedia.
- La Courneuve – 8 Mai 1945
- La Fondation pour la Mémoire de la Déportation
- La Liberation de Paris
- Lack of outside support in the Warsaw Uprising
- Lamason, Phil
- Landing Operation on Hainan Island
- Landing Ship, Tank
- Landing Vehicle Tracked
- Language of Nazi concentration camps
- Lapland War
- Last will and testament of Adolf Hitler
- Latvian Legion
- Latvian resistance movement
- Law on the status of Jews
- Law regarding foreign nationals of the Jewish race
- Laws against Holocaust denial
- Lead up to the Warsaw Uprising
- Leadership ranks of the Sturmabteilung
- League of German Girls
- Lebensborn
- Lebensraum
- Legal purge in Norway after World War II
- Legion of French Volunteers Against Bolshevism
- Legionnaires' rebellion and Bucharest pogrom
- Leni Riefenstahl
- Leningrad Front
- Leningrad People's Opolcheniye Army
- Leopold III of Belgium
- Letters from Iwo Jima
- Lexington-class aircraft carrier
- Liberation Front of the Slovenian People
- Liberation of Arnhem
- Liberation of Paris
- Liberty ship
- Lichtenburg
- Lieutenant Hubert Gruber
- Lili Marleen
- List of Adolf Hitler books
- List of Adolf Hitler speeches
- List of air operations of the Battle of Europe
- List of aircraft engines in use by Japan during World War II
- List of Aircraft engines in use of Japanese Army Air Force
- List of aircraft engines of Germany during World War Two
- List of Aircraft engines used by Japanese Navy Air Service
- List of aircraft of Italy, World War II
- List of aircraft of Japan, World War II
- List of aircraft of Russia, World War II
- List of aircraft of the French Air Force during World War II
- List of aircraft of the British, World War II
- List of aircraft of the Japanese Navy
- List of aircraft of the Luftwaffe, World War II
- List of aircraft of the U.S. military, World War II
- List of aircraft of World War II
- List of Allied forces in the Normandy Campaign
- List of Allied propaganda films of World War II
- List of Allied ships at the Japanese surrender
- List of Allied traitors during World War Two
- List of Allied warships in the Normandy Landings
- List of armour used by the Imperial Japanese Army in the Second Sino-Japanese War
- List of armoured fighting vehicles of World War II
- List of artillery weapons of the Imperial Japanese Navy
- List of Australian divisions in World War II
- List of Australian divisions in WWII
- List of Axis war criminals
- List of B-29 Superfortress operators
- List of basic World War II topics
- List of battleships of Japan
- List of Bombs in use by Imperial Japanese Army
- List of British armies in World War I
- List of British armies in WWII
- List of British divisions in WWII
- List of British Empire divisions in World War II
- List of broadsides of major World War II ships
- List of Brothers in Arms characters
- List of Canadian divisions in World War II
- List of Canadian divisions in WWII
- List of Coastal Batteries in Australia and Territories during World War II
- List of common World War II infantry weapons
- List of component units of British 1st (African) Division
- List of component units of British 1st Armoured Division
- List of component units of British 1st Infantry Division
- List of component units of Fighter Command
- List of composers influenced by the Holocaust
- List of cruiser classes of the Imperial Japanese Navy
- List of demolished entertainment venues in Paris
- List of diplomatic missions during World War II
- List of Eastern Fleet ships
- List of engines and weapons used on Japanese tanks during World War II
- List of escort aircraft carriers of the Royal Navy
- List of Female SOE Agents
- List of films about Anne Frank
- List of films based on war books — 1927–1945
- List of Finnish armies in WWII
- List of Finnish corps in the Continuation War
- List of Finnish corps in the Winter War
- List of Finnish divisions in the Continuation War
- List of Finnish divisions in the Winter War
- List of Flower-class corvettes
- List of foreign aircraft tested by Japanese forces from 1930s to WW2
- List of foreign recipients of the Knight's Cross
- List of foreign vehicles used by Nazi Germany in World War II
- List of Gaue of Nazi Germany
- List of Gauleiters
- List of German Army Groups in WWII
- List of German concentration camps
- List of German corps in WWII
- List of German divisions in World War II
- List of German divisions in World War II
- List of German military units of World War II
- List of German World War II jet aces
- List of German World War II night fighter aces
- List of Hawker Hurricane operators
- List of helicopters used in World War II
- List of Holocaust films
- List of Holocaust survivors
- List of IJA Independent Mixed Brigades
- List of IJA Mixed Brigades
- List of Imperial Japanese Navy admirals
- List of Indian corps in WWII
- List of Indian divisions in WWII
- List of individuals in the Warsaw Uprising
- List of infantry weapons of the Imperial Japanese Navy
- List of Italian divisions in WWII
- List of Japanese-run internment camps during World War II
- List of Japanese aircraft in use during the Second Sino-Japanese War
- List of Japanese armored divisions
- List of Japanese Army military engineer vehicles of World War II
- List of Japanese Auxiliary Cruiser Commerce Raiders
- List of Japanese campaigns of the Second Sino-Japanese War
- List of Japanese dreadnought battleships
- List of Japanese government and military commanders of World War II
- List of Japanese HEAT Shells in WW2
- List of Japanese hell ships
- List of Japanese Infantry Divisions
- List of Japanese infantry weapons used in the Second-Sino Japanese War
- List of Japanese military detachments in World War II
- List of Japanese military equipment of World War II
- List of Japanese Mixed Brigades
- List of Japanese nationalist movements and parties
- List of Japanese naval commanders
- List of Japanese Navy Air Force aces
- List of Japanese Navy ships and war vessels in World War II
- List of Japanese steam battleships
- List of Japanese tanks and armoured vehicles of the WWII period
- List of Japanese trainer aircraft during World War II
- List of Japanese World War II explosives
- List of Japanese World War II military specialists on the USSR
- List of Japanese World War II navy bombs
- List of Japanese World War II radar
- List of Japanese WW2 Weapons
- List of jet aircraft of World War II
- List of Knight's Cross with Oak Leaves recipients: 1940
- List of Knight's Cross with Oak Leaves recipients: 1941
- List of Knight's Cross with Oak Leaves recipients: 1942
- List of Knight's Cross with Oak Leaves recipients: 1943
- List of Knight's Cross with Oak Leaves recipients: 1944
- List of Knight's Cross with Oak Leaves recipients: 1945
- List of Kriegsmarine ships
- List of leaders of Independent State of Croatia
- List of Liberty ships: A-F
- List of Liberty ships: G-L
- List of Liberty ships: M-R
- List of Liberty ships: S-Z
- List of Liberty ships
- List of Luftwaffe aircraft prototype projects during World War II
- List of Maginot Line ouvrages
- List of major U.S. Commands of World War II
- List of major World War II warships built by minor powers
- List of Mauthausen-Gusen inmates
- List of Medal of Honor recipients for the Battle of Iwo Jima
- List of Medal of Honor recipients for World War II
- List of Medal of Honor recipients: World War II
- List of members of the July 20 Plot
- List of military aircraft of Germany
- List of military engagements of World War II
- List of military equipment of the Canadian Army during the Second World War
- List of Military Operations in the West European Theater during WW2 by Year
- List of Military operations on the Eastern Front European Theater during WW2
- List of military operations on the Eastern Front of World War II
- List of military operations
- List of military units in the Warsaw Uprising
- List of military vehicles of World War II
- List of National Socialist publishers
- List of Naval and land based operations in Mediterranean Sea Area during WW2
- List of Naval and land based operations in Pacific Theater during WW2
- List of Nazi-German concentration camps
- List of Nazi Party leaders and officials
- List of networks and movements of the French Resistance
- List of New Zealand divisions in World War II
- List of North African Campaign Battles
- List of officers of the People's Liberation Army
- List of people involved with the French Resistance
- List of people who assisted Jews during the Holocaust
- List of Polish armies in World War II
- List of Polish armies in WWII
- List of Polish divisions in World War II
- List of Polish divisions in WWII
- List of posthumous publications of Holocaust victims
- List of POW camps in Australia
- List of POW camps in Britain
- List of POW camps in Canada
- List of POW camps in Italy
- List of POW camps in Japan
- List of POW camps in occupied Germany
- List of POW camps in the Soviet Union
- List of POW camps in the United States
- List of prisoner-of-war camps in Germany
- List of Pro-Axis Leaders and Governments or Direct Control in Occupied Territories
- List of prototype World War II combat vehicles
- List of prototype WWII combat vehicles
- List of Radars in use by Imperial Japanese Army
- List of Righteous Among the Nations by country
- List of Royal Air Force aircraft squadrons
- List of Second World War Victoria Cross recipients
- List of secondary and special-issue World War II infantry weapons
- List of ships of the Free French Naval Forces
- List of ships of the Japanese Navy
- List of ships sunk by Axis warships in Australian waters
- List of ships sunk by the Imperial Japanese Navy
- List of SOE Agents
- List of SOE establishments
- List of South African Divisions in World War II
- List of Soviet Union divisions 1917–1945
- List of Special Operations Executive Operations in WW2
- List of SS personnel
- List of subcamps of Auschwitz
- List of subcamps of Buchenwald
- List of subcamps of Dachau
- List of subcamps of Flossenbürg
- List of subcamps of Gross-Rosen
- List of subcamps of Herzogenbusch
- List of subcamps of Kraków-Płaszów
- List of subcamps of Mauthausen
- List of subcamps of Mittelbau
- List of subcamps of Natzweiler-Struthof
- List of subcamps of Neuengamme
- List of subcamps of Ravensbrück
- List of subcamps of Sachsenhausen
- List of subcamps of Stutthof
- List of tanks and armoured vehicles of the Imperial Japanese Navy
- List of territories occupied by Imperial Japan
- List of the 108 Martyrs of World War Two
- List of theaters and campaigns of World War II
- List of U-boats never deployed
- List of undersea-carried planes during World War II
- List of uniforms and clothing of WWII
- List of United States Army Air Forces Air Force Component Commands
- List of United States Army divisions during World War II
- List of United States Navy escort aircraft carriers
- List of United States Navy losses in World War II
- List of United States Navy ships present at Pearl Harbor, December 7, 1941
- List of units using the B-26 Marauder during World War II
- List of V-1 storage depots
- List of V-2 test launches
- List of Vichy France Air Aces
- List of victims of Nazism
- List of victims of the Babi Yar massacre
- List of Victory ships
- List of Waffen SS units
- List of war apology statements issued by Japan
- List of weapons of military aircraft of Germany during World War Two
- List of weapons of the Japanese Navy
- List of weapons of World War II Japanese aircraft
- List of weapons on Japanese combat aircraft
- List of World War II aces by country
- List of World War II aces from Australia
- List of World War II aces from Austria
- List of World War II aces from Belgium
- List of World War II aces from Bulgaria
- List of World War II aces from Canada
- List of World War II aces from China
- List of World War II aces from Croatia
- List of World War II aces from Czechoslovakia
- List of World War II aces from Denmark
- List of World War II aces from Finland
- List of World War II aces from France
- List of World War II aces from Germany
- List of World War II aces from Greece
- List of World War II aces from Hungary
- List of World War II aces from Italy
- List of World War II aces from Japan
- List of World War II aces from New Zealand
- List of World War II aces from Norway
- List of World War II aces from Poland
- List of World War II aces from Rhodesia
- List of World War II aces from Romania
- List of World War II aces from Slovakia
- List of World War II aces from South Africa
- List of World War II aces from Spain
- List of World War II aces from the Soviet Union
- List of World War II aces from the United Kingdom
- List of World War II aces from the United States
- List of World War II aces from United States
- List of World War II air aces
- List of World War II artillery
- List of World War II Battles
- List of World War II battles
- List of World War II British naval radar
- List of World War II conferences
- List of World War II convoys
- List of World War II electronic warfare equipment
- List of World War II evacuations
- List of World War II films
- List of World War II firearms of Germany
- List of World War II firearms
- List of World War II flying aces from Romania
- List of World War II guided missiles of Germany
- List of World War II Infantry Anti-Tank Weapons of Germany
- List of World War II military aircraft of Germany
- List of World War II military equipment
- List of World War II military gliders
- List of World War II military operations
- List of World War II military units of Germany
- List of World War II military vehicles by country
- List of World War II military vehicles of Germany
- List of World War II POW camps
- List of World War II ship classes
- List of World War II ships of less than 1000 tons
- List of World War II ships
- List of World War II torpedoes of Germany
- List of World War II video games
- List of World War II weapons of France
- List of World War II weapons of Germany
- List of World War II weapons of Italy
- List of World War II weapons of the Soviet Union
- List of World War II weapons of the United Kingdom
- List of World War II weapons of the United States
- List of World War II weapons
- List of WW2 Luftwaffe aircraft by manufacturer
- List of WWII POW camps in Kenya
- Lists of World War II topics
- Lithuanian 1941 independence
- Lithuanian Activist Front
- Lithuanian Security Police
- Lithuanian Territorial Defense Force
- Little Boy
- Liverpool Blitz
- Living with the enemy in the German-occupied Channel Islands
- Local Self-Defence in Lithuania during the Nazi German occupation (1941–1944)
- Lockheed Model 10 Electra
- Lockheed Model 18 Lodestar
- Lockheed P-38 Survivors
- Lom prisoner of war camp
- London and Paris Conferences
- London Can Take It!
- London Charter of the International Military Tribunal
- London Victory Parade of 1946
- Los Alamos National Laboratory
- Los Alamos National Security
- Los Alamos Primer
- Los Alamos Ranch School
- Los Alamos, New Mexico
- Los Angeles Museum of the Holocaust
- Losses during the Second Battle of the Atlantic
- Lost Battalion
- Lower Silesian Offensive Operation
- LSM-1-class landing ship medium
- Lublin-Brest Offensive Operation
- Lublin Army
- Lublin R-VIII
- Lublin R-XIII
- Luftflotte 1
- Luftflotte 2
- Luftflotte 3
- Luftflotte 4
- Luftflotte 5
- Luftflotte 6
- Luftflotte Reich
- Luftlande-Sturm-Regiment
- Luftstreitkräfte
- Luftvärnskanonvagn L-62 Anti II
- Luftwaffe Central (Weissrutenische) detachment
- Luftwaffe Commander
- Luftwaffe Field Division
- Luftwaffe Fliegerführer
- Luftwaffe Institute of Aviation Medicine
- Luftwaffe North (Ostland) detachment
- Luftwaffe Northern (Arctic) detachment(Luftflotte 5)(Finland-Norway)
- Luftwaffe Order of Battle August 1940
- Luftwaffe serviceable aircraft strengths (1940-1945)
- Luftwaffe Southern (Balkan-Ukraine) detachment
- Luftwaffe units before the 1939 invasion of Poland
- Luftwaffe
- Luftwaffen-Legion Lettland
- Luftwaffenhelfer
- Luftwaffenmuseum der Bundeswehr
- Luger P08 pistol
- Luxembourg in World War II
- Luxembourgish government-in-exile
- Luxembourgish Patriot League
- Luxembourgish Red Lion
- Luxembourg Resistance
- LVI Panzer Corps
- Lviv Civilian Massacre (1941)
- Lviv pogroms
- Lvov-Sandomierz Offensive
- Lwów Ghetto
- Lwów Uprising
- LXIV Corps (Germany)
- Léon Degrelle

The Red Meadows is a 1945 Danish war drama directed by Bodil Ipsen and Lau Lauritzen Jr. based on resistance fighter Ole Valdemar Juul's 1945 novel of the same name. The film, starring Poul Reichhardt and Lisbeth Movin, is a suspense tale revolving around the memories of a Danish saboteur as he awaits his execution in a German war-time prison. Filmed in Denmark only months after the end of the German occupation during World War II, Red Meadows was a tribute to the Danish resistance fighters. The film received the Palme d'Or at the Cannes Film Festival and is considered a stylistic masterwork.

The Danish War Museum is a museum of military history and arms on Slotsholmen in central Copenhagen, Denmark. It is located in Christian IV's Arsenal, from which it takes its former name. On 1 July 2018, the name was changed from the Royal Danish Arsenal Museum to The Danish War Museum, in order to make it easier for guest to discern the nature of the museum.