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- Op-amp
- Opa-locka, Florida
- Opa-locka North, Florida
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- Opdyke West, Texas
- Opel
- Opelika, Alabama
- Opelousas, Louisiana
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- Open Systems Interconnection
- Open Systems Interconnection--Reference Model
- Open Systems Interconnection Specification
- Open cluster
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- Opera
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- Operational amplifier
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- Operator (mathematics)
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- Operetta
- Opet
- Opeth
- Opheim, Montana
- Ophelia (moon)
- Ophioglossales
- Ophioglossum
- Ophion (god)
- Ophir
- Ophir, Colorado
- Ophiuchus
- Ophois
- Ophrah
- Ophrys apifera
- Ophthalmology
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- Opp, Alabama
- Oppelo, Arkansas
- Oppenheim, New York
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- Optical isomerism
- Optical microscope
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- Optical time-domain reflectometer
- Optics
- Optima
- Optima, Oklahoma
- Optimization (disambiguation)
- Optimizing compiler
- Optoelectronic
- Optoelectronics
- Opus
- Opus Dei
- Oquawka, Illinois
- Or
- Or (logic)
- Oracle
- Oracle, Arizona
- Oracle Corporation
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- Oradell, New Jersey
- Oradour-sur-Glane massacre
- Oral glucose tolerance test
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- Oran, Missouri
- Orang-utan
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- Orange Cove, California
- Orange Group
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- Orange Lake, New York
- Orange Lodge
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- Orange Park, Florida
- Orange Township, Douglas County, Minnesota
- Orange Township, Ionia, Michigan
- Orange Township, Ionia County, Michigan
- Orange Township, Pennsylvania
- Orange juice
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- Orangeburg, New York
- Orangeburg, South Carolina
- Orangeburg County, South Carolina
- Orangetown, New York
- Orangetree, Florida
- Orangevale, California
- Orangeville, Illinois
- Orangeville, New York
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- Orangeville, Utah
- Orangeville Township, Michigan
- Orangutan
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- Orbisonia, Pennsylvania
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- Orchard, Iowa
- Orchard, Nebraska
- Orchard, Texas
- Orchard City, Colorado
- Orchard Grass Hills, Kentucky
- Orchard Hill, Georgia
- Orchard Hills, Pennsylvania
- Orchard Homes, Montana
- Orchard Lake Village, Michigan
- Orchard Mesa, Colorado
- Orchestra
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- Orchid
- Orchid, Florida
- Orchidaceae
- Orchidlands Estates, Hawaii
- Orchomenus
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- Orcs
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- Orcutt, California
- Ord, Nebraska
- Ordeal in Space
- Order (taxonomy)
- Order automorphism
- Order of Assassins
- Order of Friars Minor Capuchin
- Order of St. Michael and St. George
- Order of magnitude
- Order of magnitude – length
- Order of the Arrow
- Order of the Eastern Star
- Order of the Garter
- Ordered field
- Ordered pair
- Ordered pairs
- Ordered tree data structure
- Orders, decorations, and medals of the United Kingdom
- Orders of magnitude (one cubic metre to one cubic kilometre)
- Orderville, Utah
- Ordinal numbers
- Ordinary People
- Ordinary language
- Ordovician
- Ordway, Colorado
- Ore
- Ore City, Texas
- Oread
- Oreana, Illinois
- Oregano
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- Oregon, Missouri
- Oregon, Ohio
- Oregon City, Oregon
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- Oregon Township, Michigan
- Oregon Township, Pennsylvania
- Oregon Trail
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- Oreland, Pennsylvania
- Orem
- Orem, Utah
- Orestes
- Orestes, Indiana
- Orford, New Hampshire
- Organ donation
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- Organisation armée secrète
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- Organised crime
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- Organizations with .INT domain names
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- Organometallic compound
- Orgasm
- Orgel's rules
- Orgy of the Dead
- Orhan
- Oriel College, Oxford
- Orient, Illinois
- Orient, Iowa