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- Ormazd Ormoc Bay Ormond Beach Ormosia Orne Ornithischia Ornithocephalus Ornithodelphes Ornithodorus Ornithogaean Ornitholestes Ornithomimus Ornithopappi Ornithopoda Ornithoptera Oro Valley Orobanchaceae Orobanche Orochi Orocovis Orohippus Orokaiva Oroke Orokolo Orokon Oromo Oronchon Orontes Orosius Orotiña Oroville Dam Orozco Orphean
- Orpheus Orphicism Orphism Orpington Orr Orrefors Orsat apparatus Orsk Ortalidae Ortalis Ortega (Saavedra) Ortega y Gasset Ortegal, Cape Orthezia Orthis Orthocarpus Orthoceras Orthodox Jew Orthodox Judaism Orthodox Sunday Orthomorpha Orthonectida Orthopoda Orthopteroidea Orthorhapha Orthorrhapha Ortler Ortygian Orunchun Oruro Orussidae Orvieto Orwell
- Orwellian Orycteropus Oryctolagus Oryssidae Oryza Oryzomys Oryzopsis Oryzorictes Orūmīyeh Osage Osage orange Osagian Osaka Osasco Osborn Osborne Oscan Oscar Oscar II Osceola Oscillatoria Oscillatoriaceae Oscillatoriales Oscinella Oscinidae Oscinosoma Osco-Umbrian Osee Osete Osh Oshawa Osheroff Oshkosh