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- OakTree or shrub in the genus Quercus
- OarfishPelagic lampriform fish belonging to Regalecidae
- OatCereal grass and grain
- ObsolescenceState of being obsolete
- Ocean sunfishSpecies of fish
- OcimumGenus of flowering plants
- OctopusSoft-bodied eight-limbed order of molluscs
- OdonataOrder of insects that includes the dragonflies and damselflies
- OenochrominaeOenochrominae is a subfamily of the moth family Geometridae.
- OffacolusOffacolus is an extinct genus of euchelicerate, a group of chelicerate arthropods. Its onl
- Oily fishOily fish are fish species with oil (fats) in soft tissues and in the coelomic cavity arou
- OkraSpecies of edible plant
- Old World flycatcherFamily of birds
- Old World monkeyFamily of mammals
- Old World sparrowFamily of songbirds
- Old World vultureInformal group of birds
- OleaOlea ( OH-lee-ə) is a genus of flowering plants in the family Oleaceae. It includes 12 spe
- OleaceaeFamily of flowering plants
- OlenidaeOlenidae is a family of ptychopariid trilobites. Some genera, Balnibarbi and Cloacaspis, a
- OliveFruit of a cultivated plant
- OmomyidaeOmomyidae is a group of early primates that radiated during the Eocene epoch between about
- OnionBulbous vegetable
- OnychodontiformesOnychodontiformes (also known as Onychodontida and Struniiformes) is an order of prehistor
- OomyceteFungus-like eukaryotic microorganism
- Operculum (fish)Bones in a fish protecting the gills
- OphidiiformesOrder of ray-finned fish
- Ophidion barbatumOphidion barbatum, the snake blenny, is a fish species in the family Ophidiidae. It is wid
- Opodiphthera eucalyptiOpodiphthera eucalypti, the emperor gum moth, is a species of moth in the family Saturniid
- OpossumGroup of marsupial mammals
- Orange (fruit)Citrus fruit
- OrangutanGenus of Asian apes
- OrcaLargest living species of dolphin
- OrchidFamily of flowering plants in the order Asparagales
- OrchisOrchis is a genus in the orchid family (Orchidaceae), occurring mainly in Europe and North
- OrfeliaOrfelia is a cosmopolitan genus of flies in the family Keroplatidae.
- Orinoco gooseThe Orinoco goose (Neochen jubata) is a Near Threatened species of waterfowl in the tribe
- OrnithischiaExtinct clade of primarily herbivorous dinosaurs
- OrthogoniosaurusOrthogoniosaurus (meaning "straight angled lizard", referring to the straight posterior ed
- OrthopteraOrder of insects that includes grasshoppers
- Oryza sativaSpecies of plant
- Oscar de BeauxOscar de Beaux (5 December 1879 – 29 September 1955) was an Italian mammalogist. His studi
- OspreySpecies of bird
- Ossicle (echinoderm)Anatomical feature of echinoderms
- OstariophysiSuperorder of fishes
- OsteichthyesDiverse clade of vertebrate animals
- OstracodClass of crustaceans
- OstracodermArmored jawless fish of the Paleozoic
- Ostrich eggLargest type of egg from any living bird
- OtterSubfamily of mammals (Lutrinae)
- Otto KleinschmidtOtto Kleinschmidt (13 December 1870 – 25 March 1954) was a German ornithologist, theologis
- Ovenbird (family)Large family of small suboscine passerine birds
- OwlBirds from the order Strigiformes
- OysterVariety of families of Mollusca
