| World War II |
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- O-I
- OA vz.27
- Oak Ridge Associated Universities
- Oak Ridge City Center
- Oak Ridge High School (Oak Ridge, Tennessee)
- Oak Ridge Institute for Science and Education
- Oak Ridge National Laboratory
- Oak Ridge, Tennessee
- Oakley Hall
- Oath of the Horatii
- Oaxaca (ship)
- OB West
- OBD Memorial
- Oberführer
- Obergruppenführer
- Oberkampf (Paris Métro)
- Oberkommando der Luftwaffe
- Oberkommando der Marine
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- Oberrottenführer
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- Oberstgruppenführer
- Obersturmbannführer
- Obersturmführer
- Obersturmmann
- Obertruppführer
- Obice da 149/12 modello 14
- Obice da 210/22
- Obice da 75/18 modello 34
- Objective, Burma!
- Oboe (navigation)
- Occult Reich
- Occupation of Baltic republics by Nazi Germany
- Occupation of Belarus by Nazi Germany
- Occupation of Denmark
- Occupation of Estonia by Nazi Germany
- Occupation of Japan
- Occupation of Kharkov
- Occupation of Latvia by Nazi Germany
- Occupation of Norway by Nazi Germany
- Occupation of Poland (1939–1945)
- Occupation of the Baltic republics by Nazi Germany
- Occupation of the Baltic states
- Occupation of the Channel Islands
- Occupation of Vojvodina, 1941-1944
- Ochota massacre
- Ockenburg
- Octave Crouzon
- Octave Feuillet
- Odd Bull
- Odd Hassel
- Odd Martinsen
- Odd Nansen
- Oder-Neisse line
- ODESSA
- film
- Odette Sansom
- Odile Crick
- Odile Lesage
- Odilo Globocnik
- Odéon (Paris Métro)
- Odéon
- Oerlikon 20 mm cannon
- Office for Emergency Management
- Office of Censorship
- Office of Civilian Defense
- Office of Military Government, United States
- Office of Price Administration
- Office of Racial Policy
- Office of Scientific and Technical Information
- Office of Scientific Research and Development
- Office of Strategic Services
- Office of War Mobilization
- Official History of the Canadian Army in the Second World War
- Official National Front
- Offshore Patrol
- Oflag 64
- Oflag 79
- Oflag II-C
- Oflag II-D
- Oflag II-E
- Oflag IV-A
- Oflag IV-B Koenigstein
- Oflag IV-C
- Oflag IV-D
- Oflag IX-C
- Oflag V-B
- Oflag VI-B
- Oflag VII-A Murnau
- Oflag VII-B
- Oflag VII-C
- Oflag VII-D
- Oflag VIII-E Johannisbrunn
- Oflag VIII-F
- Oflag X-B
- Oflag X-C
- Oflag XII-A
- Oflag XII-B
- Oflag XIII-A
- OFLAG XIII-B
- Oflag XVII-A
- Oflag XXI-B
- Oflag XXI-C
- Oflag
- Ogasawara Naganari
- Ogden Phipps
- Ognevoy-class destroyer
- Ognjen Prica
- Ohka
- Ohrana
- Ohrdruf forced labor camp
- Ohtlikud mängud
- Oil Campaign of World War II
- Oil Campaign chronology of World War II
- Oil Campaign targets of World War II
- Oil Plan
- Oise-Aisne American Cemetery and Memorial
- Oiva Tuominen
- Oka Ichinosuke
- Okinawa Bulletins
- Okikatsu Arao
- Oklahoma World War II Army Airfields
- Oku Yasukata
- Ola Wærhaug
- Olaf Frydenlund
- Olaf Hansen
- Olav Jordet
- Olav V of Norway
- Old 666
- Old Devonshire House
- Ole Øisang
- Ole Østmo
- Ole Ellefsæter
- Ole Lilloe-Olsen
- Ole Reistad
- Ole Sæther
- Oleg Cassini
- Oleg Koshevoy
- Oleg Protopopov
- Oleksander Ohloblyn
- Olga Bancic
- Olga Benário Prestes
- Olga Horak
- Olga Lengyel
- Olga Pall
- Olier Mordrel
- Olin J. Eggen
- Oliver Goodall
- Oliver Hill
- Oliver Kessing
- Oliver Leese
- Oliver Lyttelton, 1st Viscount Chandos
- Oliver MacDonald
- Oliver Makor
- Oliver Mitchell
- Oliver P. Smith
- Oliver Philpot
- Olivia Sanchez
- Olivier Assayas
- Olivier Brouzet
- Olivier Gruner
- Olivier Lecerf
- Olivier Martinez
- Olivier Monterrubio
- Olivier Quint
- Olle Petrusson
- Olli Puhakka
- Olof Thörnell
- Oluf Wesmann-Kjær
- Olympia (painting)
- Olympiades (Paris Métro)
- Olympic Stadium (Berlin)
- Omaha Beach
- Omar Bradley
- Omar Sahnoun
- Omelyan Kovch
- Omer Nishani
- Omnipotent Government
- On-to-Ottawa Trek
- ON convoys
- film
- On the Nameless Height
- Ona Šimaitė
- novel
- Once Before I Die
- Once There Was a War
- Ondřej Pukl
- Ondrej Nepela
- One Big Union (Canada)
- One of Our Aircraft Is Missing
- One Survivor Remembers
- One Thousand Children
- Only the Brave
- Onna Tachiguishi-Retsuden
- OP-20-G
- Opana Radar Site
- Opekta
- Opel Blitz
- Open Gaz de France
- Opera Gallery
- Operation Abercrombie
- Operation Abstention
- Operation Adler
- Operation Agreement
- Operation Aida
- Operation Alpenveilchen
- Operation Alpha
- Operation Alphabet
- Operation Alsos
- Operation Ambassador
- Operation Amherst
- Operation Amsterdam
- Operation Anklet
- Operation Anthropoid
- Operation Aphrodite
- Operation Archery
- Operation Archway
- Operation Arctic Fox
- Operation Ariel
- Operation Arsenal
- Operation Atlantic
- Operation Attila (WW II)
- Operation August Storm
- Operation Autonomous
- Operation Backfire (WWII)
- Operation Bagration
- Operation Bajadere
- Operation Baobab
- Operation Barbarossa
- Operation Barclay
- Operation Basalt
- Operation Battleaxe order of battle
- Operation Battleaxe
- Operation Baytown
- Operation Bellicose
- Operation Belt
- Operation Beowulf
- Operation Berlin (Atlantic), 1941
- Operation Berlin (Arnhem rescue), 1944
- Operation Bernhard
- Operation Big
- Operation Bikini
- Operation Biting
- Operation Black Tulip
- Operation Blackcock
- Operation Blackstone
- Operation Blockbuster
- Operation Bluecoat
- Operation Büffel
- Operation Boardman
- Operation Bodyguard
- Operation Bolero
- Operation Brevity order of battle
- Operation Brevity
- Operation Brushwood
- Operation Candytuft
- Operation Canuck
- Operation Capital
- Operation Capri
- Operation Carpetbagger
- Operation Carthage
- Operation Cartwheel
- Operation Cascade
- Operation Catechism
- Operation Cerberus
- Operation Chahar order of battle
- Operation Chahar
- Operation Charnwood
- Operation Chastise
- Operation Chestnut
- Operation Chettyford
- Operation Christ Rose
- Operation Chronicle
- Operation Clawhammer
- Operation Claymore
- Operation Cleanslate
- Operation Clipper
- Operation Cobra
- Operation Cockpit
- Operation Cold Comfort
- Operation Collar (commando raid)
- Operation Collar (convoy)
- Operation Colossus
- Operation Compass
- Operation Constellation
- Operation Cooney
- Operation Copperhead
- Operation Corkscrew
- Operation Cornflakes
- Operation Corona
- Operation Cottage
- film
- Operation Crossbow
- Operation Crossword
- Operation Crusader
- Operation Culverin
- Operation Cycle
- Operation Darkness
- Operation Daybreak
- Operation Deadlight
- Operation Defoe
- Operation Delphin
- Operation Desecrate One
- Operation Diadem order of battle
- Operation Diadem
- Operation Dingson
- Operation Diver
- Operation Donnerschlag
- Operation Doppelkopf
- Operation Dove (Ireland)
- Operation Dove
- Operation Downfall
- Operation Dracula
- Operation Dragoon
- Operation Driftwood
- Operation Dunhill
- Operation Eagle Attack
- Operation Edelweiss
- Operation Eisbär
- Operation Eisenhammer
- Operation Epsilon
- Operation Epsom
- Operation Europe: Path to Victory
- Operation Excess
- Operation Fall Rot
- Operation Felix
- Operation Ferdinand
- Operation Flax
- Operation Flintlock (World War II)
- Operation Forager
- Operation Fortitude
- Operation Foxley
- Operation Frankton
- Operation Frantic Joe
- Operation Frantic
- Operation Frühlingserwachen
- Operation Fustian
- Operation Gaff
- Operation Gambit
- Operation Gauntlet
- Operation Goldeneye
- Operation Goodwood
- Operation Green (Ireland)
- Operation Greif (game)
- Operation Greif
- Operation Grenade
- Operation Gymnast
- Operation Haifisch
- Operation Hailstone
- Operation Halberd
- Operation Halyard
- Operation Hambone
- Operation Hannibal
- Operation Harborage
- Operation Harpoon (1942)
- Operation Harpune
- Operation Haudegen
- Operation Herbstreise
- Operation Herkules
- Operation Herring
- Operation Himmler
- Operation Hurricane (1944)
- Operation Husky order of battle
- Operation Husky
- Operation Ichi-Go
- Operation Ikarus
- Operation Infatuate
- Operation Innkeeper
- Operation Ironside
- Operation Isabella
- Operation Iskra
- Operation Jael
- Operation Jaywick
- Operation Jedburgh
- Operation Jehol order of battle
- Operation Jericho
- Operation Jubilee order of battle
- Operation Juneau
- Operation Juno
- Operation K
- Operation Ke
- Operation Keelhaul
- Operation Keystone
- Operation Kiebitz
- Operation Konrad
- Operation Kremlin
- Operation Krohcol
- Operation Kutuzov
- Operation Ladbroke
- Operation Lüttich
- Operation Lobster I
- Operation Lobster
- Operation Lost
- Operation Loyton
- Operation Lumberjack
- Operation Lustre
- Operation Lusty
- Operation Magic Carpet
- Operation Mainau
- Operation Majestic
- Operation Manna
- Operation Maple
- Operation Margarethe
- Operation Market Garden order of battle
- Operation Market Garden
- Operation Mars
- Operation Matador (disambiguation)
- Operation Matterhorn
- Operation Mincemeat
- Operation Mo
- Operation Musketoon
- Operation Narcissus
- Operation Nelson
- Operation Newton
- Operation Noah (World War II)
- Operation Nordlicht
- Operation Nordseetour
- Operation Nordwind (1941)
- Operation Nordwind
- Operation Oboe Six
- Operation Obviate
- Operation Osprey
- Operation Ostfront
- Operation Ostra Brama
- Operation Outward
- Operation Overlord
- Operation Pacific
- Operation Panzerfaust
- Operation Paperclip
- Operation Paravane
- Operation Pastel
- Operation Pastorius
- Operation Pedestal
- Operation Pegasus
- Operation Pelikan
- Operation Perch
- Operation Persecution
- Operation Petticoat
- Operation Platinum Fox
- Operation Plunder
- Operation Pluto
- Operation Pointblank
- Operation Polkovodets Rumyantsev
- Operation Polyarnaya Zvezda
- Operation Pomegranate (SAS)
- Operation Pomegranate
- Operation Pugilist
- Operation Queen
- Operation Quicksilver (WWII)
- Operation Rösselsprung (Naval)
- Operation Ratweek
- Operation Red Dog
- Operation Reinhard
- Operation Renntier
- Operation Reservist
- Operation Resurrection
- Operation Retribution
- Operation Rimau
- Operation Roast
- Operation Romeo
- Operation Royal Marine
- Operation Salaam
- Operation Samwest
- Operation Saturn
- Operation Savannah
- Operation Saxifrage
- Operation Scavenger
- Operation Sea Eagle
- Operation Seagull (Ireland)
- Operation Seagull I
- Operation Seagull II
- Operation Seagull
- Operation Sealion Order of Battle
- Operation Sea Lion
- Operation Shamrock
- Operation Shingle
- Operation Silver Fox
- Operation Skagway
- Operation Skye
- Operation Slapstick
- Operation Sledgehammer
- Operation Snatch
- Operation Solstice
- Operation Sonnenblume
- Operation Source
- Operation Span
- Operation Spark (1940)
- Operation Speedwell
- Operation Sportpalast
- Operation Spring
- Operation Starvation
- Operation Steinbock
- Operation Stella Polaris
- Operation Stone Age
- Operation Stonewall
- Operation Strangle
- Operation Substance
- Operation Surgeon
- Operation Tabarin
- Operation Tan No. 2
- Operation Tanne Ost
- Operation Tannenberg
- Operation Tempest
- Operation Terminal
- Operation Tidal Wave
- Operation Tiderace
- Operation Tombola
- Operation Tonga
- Operation Torch
- Operation Totalize
- Operation Tractable
- Operation Transom
- Operation Tungsten
- Operation Typical
- Operation Tyr
- Operation U-Go
- Operation Underworld
- Operation Uranus
- Operation Varsity
- Operation Venezia
- Operation Vengeance
- Operation Veritable
- Operation Vigorous
- Operation Vulcan
- Operation Walküre
- Operation Weserübung
- Operation Whale
- Operation Wieniec
- Operation Wikinger
- Operation Wilfred
- Operation Willi
- Operation Wintergewitter
- Operation Wotan
- Operation Wunderland
- Operation Währung
- Operation Zebra
- Operation Zeppelin (Allies)
- Operation Zeppelin (Assassination Plot)
- Operation Zipper
- Operation Zitronella
- Operational Zone Adriatic Coast
- Operations Reckless and Persecution
- Opfer der Vergangenheit
- Opposing forces in the Polish September Campaign
- Opposition to World War II
- Opytny-class destroyer
- Opéra-Comique
- Opéra (Paris Métro)
- Opéra Bastille
- Opéra National de Paris
- Oradour-sur-Glane
- Oranienburg concentration camp
- Orchestre de la Société des Concerts du Conservatoire
- Orde Wingate
- Ordensburg Krössinsee
- Ordensburg Sonthofen
- Ordensburg Vogelsang
- Order 7161
- Order No. 227
- Order No. 270
- Order of Alexander Nevsky
- Order of Battle Battle of Pingxingguan
- Order of battle Battle of South Shanxi
- Order of Battle Battle of Taiyuan
- Order of Battle Central Hupei Operation (November 25–30, 1940)
- Order of battle Defense of the Great Wall
- Order of battle for Amoy Operation
- Order of Battle for Battle of Changsha (1939)
- Order of Battle for Battle of South Guangxi
- Order of battle for Campaign of Northern and Eastern Henan 1938
- Order of battle for Campaign of Northern and Eastern Honan 1938
- Order of battle for Convoy SC-7
- Order of battle for Guangdong Operation
- Order of battle for the American airborne landings in Normandy
- Order of battle for the Battle of Beiping-Tianjin
- Order of battle for the Battle of France
- Order of Battle January 28 Incident
- Order of battle of Battle of Wuhan
- Order of battle of the Battle of Beiping-Tianjin
- Order of Battle of the Battle of Lanfeng
- Order of battle of the Battle of Shanghai
- Order of Battle of the Chindits
- Order of battle of the German Ninth Army, October 1941
- Order of Battle Peiking – Hankou Railway Operation
- Order of battle Peiking – Suiyuan Railway Operation
- Order of Battle Suiyuan Campaign (1936)
- Order of battle Swatow Operation
- Order of Battle Tianjin–Pukou Railway Operation
- Order of Battle, Battle of Nanchang
- Order of Battle, East African Campaign (World War II)
- Order of Battle: Battle of Changde
- Order of battle: Battle of Xuzhou
- Order of Battle: Battle of Zaoyang-Yichang
- Order of Battle: Hundred Regiments Offensive
- Order of Bogdan Khmelnitsky
- Order of Flemish militants
- Order of Glory
- Order of Kutuzov
- Order of Lenin
- Order of Nakhimov
- Order of Polonia Restituta
- Order of Suvorov
- Order of the Bath
- Order of the British Empire
- Order of the Crown of King Zvonimir
- Order of the German Eagle
- Order of the Golden Kite
- Order of the National Hero
- Order of the October Revolution
- Order of the Patriotic War
- Order of the Red Banner
- Order of Ushakov
- Order of Victory
- Orders of battle for Downfall
- Orders, decorations, and medals of Nazi Germany
- Ordnance ML 3 inch Mortar
- Ordnance QF 17 pounder
- Ordnance QF 18 pounder
- Ordnance QF 2 pounder
- Ordnance QF 25 pounder
- Ordnance QF 3 pounder Vickers
- Ordnance QF 6 pounder
- Ordnance QF 75 mm
- Ordnungspolizei
- Ordre de la Libération
- Oregon Shipbuilding Corporation
- Organisation for Economic Co-operation and Development
- Organisation Todt
- Organization for the Protection of the People's Fighters
- Organization of Imperial Japanese Army forces in the Pacific
- Organization of Japanese defensive units in Okinawa
- Organization of Japanese Expeditionary forces in China
- Organization of Japanese forces in Southeast Asia
- Organization of Japanese fortifications in New Guinea area
- Organization of the China Garrison detachment of the Imperial Japanese Army (to 1937)
- Organization of the Imperial Japanese Central China Army
- Organization of the Imperial Japanese Navy Alaskan Strike Group
- Organization of the Jews in Bulgaria
- Organization of the Kwantung Army of Japan
- Organization of the Luftwaffe
- Organization of the Third Reich
- Orglandes German war cemetery
- Orgues de Flandre
- Original Shaftesbury Theatre
- Origins of World War II (game)
- Orita M1941
- Orlando DiGirolamo
- Orlando Executive Airport
- Orlando Leopardi
- Orlando Ward
- Orly - Ouest (Orlyval)
- Orly - Sud (Orlyval)
- Orly Airport (Paris)
- Orlyval
- Orme G. Stuart
- Ormsby-class attack transport
- Oronce Finé
- Oroville Municipal Airport
- ORP Żbik
- ORP Ślązak (L26)
- ORP Błyskawica
- ORP Burza
- ORP Dzik
- ORP General Haller
- ORP Grom
- ORP Gryf
- ORP Jaskółka
- ORP Jastrząb
- ORP Krakowiak
- ORP Kujawiak
- ORP Mazur
- ORP Orkan
- ORP Orzeł
- ORP Piorun (G65)
- ORP Ryś
- ORP Sęp
- ORP Sokół
- ORP Wicher (1928)
- ORP Wilk
- Orphism (art)
- Orsa-class torpedo boat
- Orsay – Ville (Paris RER)
- Orson Leon Crandall
- Ortrun Enderlein
- Orval Faubus
- Orval R. Cook
- Orvar Trolle
- Orville Emil Bloch
- Orville Freeman
- Oryoku Maru
- Orzeł incident
- OS2U Kingfisher
- Osami Nagano
- Oscar C. Badger II
- Oscar De Cock
- Oscar De Somville
- Oscar F. Perdomo
- Oscar G. Johnson
- Oscar Grégoire
- Oscar I of Sweden
- Oscar J. Zuniga
- Oscar M. Laurel
- Oscar Shumsky
- Oscar V. Peterson
- Oscar van Rappard
- Oscar Wilde
- Oscarsborg Fortress
- Oshima Ken'ichi
- Oskar Brüsewitz
- Oskar Dinort
- Oskar Dirlewanger
- Oskar Fried
- Oskar Goßler
- Oskar Körner
- Oskar Kokoschka
- Oskar Müller
- Oskar Morgenstern
- Oskar Rosenfeld
- Oskar Schindler
- Oskari Friman
- Oslo report
- Osman Kulenović
- Osovets Offensive Operation
- OSS Detachment 101
- Ossewabrandwag
- OST-Arbeiter
- Ost battalion
- Oster Conspiracy
- Ostforschung
- Ostlegionen
- Ostmark (Austria)
- Ostrogozhsk-Rossosh Operation
- Ostwind
- Osvaldo Aranha
- Osvaldo Ardiles
- Oswald Birley
- Oswald Boelcke
- Oswald Mosley
- Oswald Phipps, 4th Marquess of Normanby
- Oswald Pohl
- Oswald Teichmüller
- Oszkár Gerde
- Ota Šik
- Otakar Batlička
- Otakar Jaroš
- Otmar Freiherr von Verschuer
- Otokar Keršovani
- Otomars Oškalns
- Ōtori-class torpedo boat
- Otozō Yamada
- Otpisani
- Otter Light Reconnaissance Car
- Ottmar Walter
- Otto Abetz
- Otto Baum
- Otto Bertram
- Otto Bradfisch
- Otto Carius
- Otto Ciliax
- Otto Dietrich
- Otto Špaček
- Otto Ernst Remer
- Otto Fickeisen
- Otto Frank
- Otto Freundlich
- Otto Georg Thierack
- Otto Günsche
- Otto Hellmuth
- Otto Herschmann
- Otto Hitzfeld
- Otto Hofmann
- Otto Hultberg
- Otto John
- Otto Königsberger
- Otto Kerner, Jr.
- Otto Kiep
- Otto Kittel
- Otto Klemperer
- Otto Kretschmer
- Otto Kumm
- Otto L. Nelson, Jr.
- Otto Lasch
- Otto Meißner
- Otto Müller (wrestler)
- Otto Ohlendorf
- Otto P. Weyland
- Otto Passman
- Otto Rahn
- Otto Rasch
- Otto Robert Frisch
- Otto Ruge
- Otto Schimek
- Otto Schmirgal
- Otto Schulz
- Otto Skorzeny
- Otto Steinbrinck
- Otto Strasser
- Otto Telschow
- Otto Tief
- Otto Ville Kuusinen
- Otto von Bülow
- Otto von Knobelsdorff
- Otto von Lossow
- Otto von Porat
- Otto von Stülpnagel
- Otto Wöhler
- Otto Wagener
- Otto Wahle
- Otto Weddigen
- Otto Weidinger
- Otto Wächter
- Ou Zhen
- Oumar Dieng
- Oumar Sène
- Oumar Tchomogo
- Our Enemy- The Japanese
- Our Job in Japan
- Ourcq (Paris Métro)
- Ours-Pierre-Armand Petit-Dufrénoy
- Out Distance
- 2003 film
- Outer London Defence Ring
- Outpost Snipe
- Ouvrage Ancien Camp
- Ouvrage Anzeling
- Ouvrage Arrondaz
- Ouvrage Aumetz
- Ouvrage Baisse de Saint Veran
- Ouvrage Bambesch
- Ouvrage Barbonnet
- Ouvrage Berenbach
- Ouvrage Bersillies
- Ouvrage Billig
- Ouvrage Bois du Four
- Ouvrage Bois Karre
- Ouvrage Bousse
- Ouvrage Boussois
- Ouvrage Bovenberg
- Ouvrage Brehain
- Ouvrage Cap Martin
- Ouvrage Castillon
- Ouvrage Cave à Canon
- Ouvrage Champ de Tir
- Ouvrage Chatelard
- Ouvrage Col Agnon
- Ouvrage Col de Brouis
- Ouvrage Col de Buffere
- Ouvrage Col de Crous
- Ouvrage Col de Restefond
- Ouvrage Col des Banquettes
- Ouvrage Col des Gardes
- Ouvrage Col du Caire Gros
- Ouvrage Col du Fort
- Ouvrage Col du Granon
- Ouvrage Coucou
- Ouvrage Coume Annexe Nord
- Ouvrage Coume Annexe Sud
- Ouvrage Coume
- Ouvrage Denting
- Ouvrage Einseling
- Ouvrage Eth
- Ouvrage Ferme Chappy
- Ouvrage Fermont
- Ouvrage Flaut
- Ouvrage Fontvive Nord-ouest
- Ouvrage Four a Chaux
- Ouvrage Fressinen
- Ouvrage Galgenberg
- Ouvrage Gondran
- Ouvrage Gordolon
- Ouvrage Grand Hohekirkel
- Ouvrage Granges Communes
- Ouvrage Hackenberg
- Ouvrage Haut-Poirier
- Ouvrage Hobling
- Ouvrage Hochwald
- Ouvrage Immerhof
- Ouvrage Janus
- Ouvrage Kerfent
- Ouvrage Kobenbusch
- Ouvrage L'Agaisen
- Ouvrage La Beole
- Ouvrage La Dea
- Ouvrage La Moutiere
- Ouvrage La Serena
- Ouvrage Latiremont
- Ouvrage Laudrefang
- Ouvrage Le Lavoir
- Ouvrage Lembach
- Ouvrage Les Aittes
- Ouvrage Les Rochilles
- Ouvrage Mauvais Bois
- Ouvrage Metrich
- Ouvrage Michelsberg
- Ouvrage Molvange
- Ouvrage Mont Agel
- Ouvrage Mont des Welches
- Ouvrage Monte Grosso
- Ouvrage Mottemberg
- Ouvrage Oberheid
- Ouvrage Otterbiel
- Ouvrage Pas du Roc
- Ouvrage Plan Caval
- Ouvrage Plate Lombard
- Ouvrage Reservoir
- Ouvrage Restefond
- Ouvrage Rimplas
- Ouvrage Roche Lacroix
- Ouvrage Rochonvillers
- Ouvrage Rohrbach
- Ouvrage Roquebrunne
- Ouvrage Saint Antoine
- Ouvrage Saint Gobain
- Ouvrage Saint Ours Bas
- Ouvrage Saint Ours Haut
- Ouvrage Saint Ours Nord-est
- Ouvrage Saint Roch
- Ouvrage Sainte Agnes
- Ouvrage Salmagne
- Ouvrage Sapey
- Ouvrage Sarts
- Ouvrage Schiesseck
- Ouvrage Schoenenbourg
- Ouvrage Sentzich
- Ouvrage Simserhof
- Ouvrage Soetrich
- Ouvrage Teting
- Ouvrage Valdeblore
- Ouvrage Village Coume
- Ouvrage Welschhof
- Ouvry Lindfield Roberts
- Ova A. Kelley
- Over Here (TV serial)
- Overloon War Museum
- Overlord (1994 video game)
- Oveta Culp Hobby
- Ovitz family
- OVP (firearm)
- Owen Chamberlain
- Owen J. Baggett
- Owen submachine gun
- Owen Tudor Boyd
- Owen W. Siler
- Ox Emerson
- Oxmo Puccino
- Oy Insinööritoimisto Ratas
| World War II |
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The original article can be found at Index of World War II articles (O) and the edit history here.