List of World War II topics (O)

# 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
# Oberkommando der Wehrmacht
# Oberkommando des Heeres
# Obermann
# Oberrottenführer
# Oberscharführer
# Oberschütze
# 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 Kharkiv
# 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
# Odette (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 Plan
# Oise-Aisne American Cemetery and Memorial
# Oiva Tuominen
# Oka Ichinosuke
# Okinawa Bulletins
# Okitsugu 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 Ericsson
# Olle Petrusson
# Olli Puhakka
# Olof Thörnell
# Olonets Group
# 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
# On the Double (film)
# On the Nameless Height
# Ona Šimait?
# Once (novel)
# Once Before I Die
# Once There Was a War
# Ond?ej 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
# Operation Berlin (Arnhem rescue)
# 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
# Operation Colossus
# Operation Compass
# Operation Constellation
# Operation Cooney
# Operation Copperhead
# Operation Corkscrew
# Operation Cornflakes
# Operation Corona
# Operation Cottage
# Operation Crossbow (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 Excess
# Operation Fall Rot
# Operation Felix
# Operation Ferdinand
# Operation Flax
# Operation Flintlock
# 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 (World War II)
# 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
# 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 Sealion
# 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)
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# 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 ?bik
# ORP ?l?zak
# ORP B?yskawica
# ORP Burza
# ORP Dzik
# ORP General Haller
# ORP Grom
# ORP Gryf
# ORP Jaskó?ka
# ORP Jastrz?b
# ORP Krakowiak
# ORP Kujawiak
# ORP Mazur
# ORP Orkan
# ORP Orze?
# ORP Piorun (G65)
# ORP Ry?
# ORP S?p
# ORP Sokó?
# ORP Wicher
# 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
# Orze? 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 Kulenovi?
# Osovets Offensive Operation
# OSS Detachment 101
# Ossewabrandwag
# OST-Arbeiter
# Ost battalion
# Oster Conspiracy
# Ostforschung
# Ostlegionen
# Ostmark
# 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 Batli?ka
# Otakar Jaroš
# Otmar Freiherr von Verschuer
# Otokar Keršovani
# Otomars Oškalns
# Otori class torpedo boat
# Otoz? Yamada
# Otpisani
# Otter Light Reconnaissance Car
# Ottmar Walter
# Otto Abetz
# Otto Baum
# Otto Bertram
# Otto Bradfisch
# Otto Carius
# Otto Ciliax
# Otto Dietrich
# Otto Špa?ek
# 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 Olsen
# 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
# Out of the Ashes
# 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
# 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