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Articles beginning with O
- Orange (color)
- Orange (fruit)
- Orange Beach, Alabama
- Orange Bowl
- Orange Caramel
- Orange City, Florida
- Orange City, Iowa
- Orange County
- Orange County, California
- Orange County, Florida
- Orange County, Indiana
- Orange County, New York
- Orange County, North Carolina
- Orange County, Texas
- Orange County, Vermont
- Orange County, Virginia
- Orange Cove, California
- Orange flower water
- Orange Free State
- Orange Is the New Black
- Orange juice
- Orange Line (CTA)
- Orange Park, Florida
- Orange Range
- Orange River
- Orange Studio
- Orange Walk District
- Orange Walk Town
- Orange, California
- Orange, New Jersey
- Orange, New South Wales
- Orange, Ohio
- Orange, Texas
- Orange, Vaucluse
- Orange, Virginia
- Orange, Wisconsin
- Orange-breasted sunbird
- Orange-red
- Orange-thighed frog
- Orangeburg County, South Carolina
- Orangeburg, South Carolina
- Orangeman's Day
- Orangutan
- Orani
- Oranienburg
- Oranienburg concentration camp
- Oranjestad, Aruba
- Orator
- Oratorio
- Orbe
- Orbe (district)
- Orbec
- Orbetello
- Orbey
- Orbit
- Orbital
- Orbital eccentricity
- Orbital forcing
- Orbital inclination
- Orbital period
- Orbital plane (astronomy)
- Orbital resonance
- Orbital revolution
- Orbital speed
- Orbiting Carbon Observatory
- Orc
- Orchard
- Orchard City, Colorado
- Orchard Grass Hills, Kentucky
- Orchard Island, Ohio
- Orchard MRT station
- Orchard Road
- Orchard, Iowa
- Orchestra group of musicians playing instruments together
- Orchestra pit
- Orchestration
- Orchestre de Paris
- Orchid
- Orchid (color)
- ORCID
- Ord, Nebraska
- Order
- Order (biology)
- Order of Australia
- Order of Canada
- Order of Jamaica
- Order of Lenin
- Order of Leopold (Belgium)
- Order of magnitude approximation of the logarithm of a value
- Order of Merit an award, for notable work in the armed forces, science, art, literature, or for the promotion of culture
- Order of Merit of the Italian Republic
- Order of operations
- Order of Prince Henry
- Order of Santiago
- Order of St Michael and St George an order of chivalry
- Order of succession
- Order of the Aztec Eagle
- Order of the Bath
- Order of the British Empire
- Order of the Companions of Honour
- Order of the Federal Republic
- Order of the Garter
- Order of the Indian Empire
- Order of the Phoenix
- Order of the Rising Sun
- Order of the Solar Temple
- Order of the Star of India
- Order of the Thistle order of chivalry, associated with Scotland
- Order of the White Eagle (Poland)
- Order theory
- Ordered pair
- Orders of magnitude (time)
- Ordiarp
- Ordinal number
- Ordinary differential equation
- Ordinary language philosophy
- Ordinary least squares
- Ordinary Love (U2 song)
- Ordinary People
- Ordinary seaman (rank)
- Ordino
- Ordnance Survey
- Ordnance Survey National Grid
- Ordo Templi Orientis
- Ordonnac
- Ordonnaz
- Ordos City
- Ordovician
- Ordu
- Ordubad District
- Orduspor
- Ore
- Ore Mountains
- Örebro
- Örebro County
- Örebro HK
- Örebro Municipality
- Örebro SK
- Oreco
- Oregano
- Oregon
- Oregon City, Oregon
- Oregon Concordia University
- Oregon County, Missouri
- Oregon Inlet
- Oregon State University
- Oregon Territory
- Oregon Trail
- Oregon, Illinois
- Oregon, Missouri
- Oregon, Ohio
- Oregrounds iron
- Öregrund
- Orègue
- Oreland, Pennsylvania
- Orellana Province
- Orem, Utah
- Oreo
- Oreophrynella
- Oresund Bridge
- Oreye
- ORF (broadcaster)
- Orford
- Organ
- Organ (anatomy)
- Organ (music)
- Organ donation
- Organ system
- Organelle In cell biology
- Organic
- Organic chemistry
- Organic compound
- Organic farms
- Organic light-emitting diode type of light-emitting diode
- Organic matter
- Organic reaction
- Organic synthesis
- Organisation for the Prohibition of Chemical Weapons
- Organisation internationale de la Francophonie
- Organisation of Islamic Cooperation
- Organisation of the Commissioner for Philately and Scripophily
- Organism
- Organization
- Organization for Security and Co-operation in Europe
- Organization of American States
- Organized crime
- Organolithium reagent
- Organometallic chemistry
- Organotroph
- Orgasm
- Orges, Switzerland
- Orgeval, Aisne
- Orgnac-l'Aven
- Orgon
- Orgosolo
- Örgryte IS
- Orgy
- Orgy (band)
- Orhan Pamuk
- Oriana Fallaci
- Oribe Peralta
- Oriel College, Oxford
- Orient
- Orient Express
- Orient, Illinois
- Orient, Iowa
- Orientability
- Oriental Longhair
- Oriental magpie-robin
- Oriental Orthodoxy
- Oriental Pearl Tower
- Oriental studies
- Oriental Telephone Company
- Oriental turtle dove
- Orientation
- Orienteering
- Origa
- Origami
- Origanum
- Origen
- Origin of birds
- Origin of life is a scientific problem which is not yet solved
- Origin of Symmetry
- Original sin
- Original Six
- Origins of the blues
- Origlio
- Origne
- Origné
- Origny-en-Thiérache
- Origny-Sainte-Benoite
- Orihuela
- Orillia
- Orimattila
- Orin, Pyrénées-Atlantiques
- Orinoco
- Oriole
- Oriole Park at Camden Yards
- Orion
- Orion (constellation) the largest constellations in the sky
- Orion (mythology)
- Orion (spacecraft)
- Orion Arm
- Orion complex
- Orion nebula
- Orion Pictures
- Orion's Belt
- Orion, Pyrénées-Atlantiques
- Oristano
- Oritsé Williams
- Orivesi
- Orix Buffaloes
- Oriya film industry
- Oriya Wikipedia
- Orizaba
- Örkelljunga
- Örkelljunga Municipality
- Orkney Islands
- Orland Park, Illinois
- Orland, California
- Orlande de Lassus
- Orlando Bloom
- Orlando Brown American actor and rapper
- Orlando Cepeda
- Orlando City SC
- Orlando Cole
- Orlando Gibbons
- Orlando International Airport
- Orlando Jones
- Orlando Jordan
- Orlando Letelier
- Orlando Magic
- Orlando nightclub shooting
- Orlando Peçanha de Carvalho
- Orlando Pride
- Orlando, Florida
- Orlando, Oklahoma
- Orléans
- Orleans (band)
- Orleans County, New York
- Orleans County, Vermont
- Orleans, Iowa
- Orlov diamond
- Orly
- Orly Airport
- Orly Levy-Abekasis
- Ormalingen
- Ormara
- Ormoc
- Ormond Beach, Florida
- Ormont-Dessous
- Ormont-Dessus
- Ormoy, Yonne
- Ormskirk
- Orna Porat
- Ornaisons
- Ornamental plant
- Ornamentation (music)
- Orne department in France
- Ornella Muti