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- Ocelote: (Schreber, 1777) [Chordata, Mammalia, Carnivora, Felidae]
- Ofiocéfalo: (Bloch, 1793) [Chordata, Actinopterygii, Anabantiformes, Channidae]
- Ofiocéfalo asiático: (Bloch, 1793) [Chordata, Actinopterygii, Anabantiformes, Channidae]
- Ofisaurio: (Linnaeus, 1758) [Chordata, Reptilia, Squamata, Anguidae]
- Ofisario de Pallas: (Pallas, 1775) [Chordata, Reptilia, Squamata, Anguidae]
- Ofisaurio europeo: (Linnaeus, 1758) [Chordata, Reptilia, Squamata, Anguidae]
- Ofisaurio norteamericano: (Rafinesque, 1830) [Chordata, Reptilia, Squamata, Anguidae]
- Ofiura: (Lamarck, 1801) [Echinodermata, Ophiuroidea, Ophiurida, Ophiuridae]
- Ofiura de espinas: (Linnaeus, 1758) [Echinodermata, Ophiuroidea, Ophiurida, Ophiuridae]
- Ofiura ojo de buey: (Linnaeus, 1758) [Echinodermata, Ophiuroidea, Ophiurida, Ophiuridae]
- Ofiura de burbuja: (Delle Chiaje, 1828) [Echinodermata, Ophiuroidea, Ophiurida, Ophiuridae]
- Ojón (atún): (Linnaeus, 1758) [Chordata, Actinopterygii, Scombriformes, Scombridae]
- Okapi: (P.L. Sclater, 1901) [Chordata, Mammalia, Artiodactyla, Giraffidae]
- Olingo: (Thomas, 1902) [Chordata, Mammalia, Carnivora, Procyonidae]
- Olm: (Laurenti, 1768) [Chordata, Amphibia, Urodela, Proteidae]
- Onagro: (Pallas, 1775) [Chordata, Mammalia, Perissodactyla, Equidae]
- Ondrata (rata almizclada): (Linnaeus, 1766) [Chordata, Mammalia, Rodentia, Cricetidae]
- O-oo-aa: (Temminck, 1827) [Chordata, Aves, Passeriformes, Monarchidae]
- Opilión: (Sundevall, 1833) [Arthropoda, Arachnida, Opiliones, Phalangiidae]
- Orangután: (Linnaeus, 1760) [Chordata, Mammalia, Primates, Hominidae]
- Orangután de Borneo: (Linnaeus, 1760) [Chordata, Mammalia, Primates, Hominidae]
- Orangután de Sumatra: (Lesson, 1827) [Chordata, Mammalia, Primates, Hominidae]
- Orca: (Linnaeus, 1758) [Chordata, Mammalia, Artiodactyla, Delphinidae]
- Orectolobo: (Bonaparte, 1834) [Chordata, Chondrichthyes, Orectolobiformes, Orectolobidae]
- Oreja de mar: (Linnaeus, 1758) [Mollusca, Gastropoda, Haliotida, Haliotidae]
- Oreja de mar mediterránea o peneira o criba: (Linnaeus, 1758) [Mollusca, Gastropoda, Haliotida, Haliotidae]
- Oreja de mar negra: (Swainson, 1822) [Mollusca, Gastropoda, Haliotida, Haliotidae]
- Oreja de mar roja: (Swainson, 1822) [Mollusca, Gastropoda, Haliotida, Haliotidae]
- Oreja de mar verde: (Donovan, 1808) [Mollusca, Gastropoda, Haliotida, Haliotidae]
- Orejudo septentrional: (Trouessart, 1897) [Chordata, Mammalia, Chiroptera, Vespertilionidae]
- Orejudo septentrional europeo: (Linnaeus, 1758) [Chordata, Mammalia, Chiroptera, Vespertilionidae]
- Orejudo septentrional americano: (Harlan, 1831) [Chordata, Mammalia, Chiroptera, Vespertilionidae]
- Orgia: (Ochsenheimer, 1810) [Arthropoda, Insecta, Lepidoptera, Erebidae]
- Orgia de los brezos: (Linnaeus, 1758) [Arthropoda, Insecta, Lepidoptera, Erebidae]
- Orgia de los frutales: (Linnaeus, 1758) [Arthropoda, Insecta, Lepidoptera, Erebidae]
- Orgia de marcas blancas: (Butler, 1877) [Arthropoda, Insecta, Lepidoptera, Erebidae]
- Orgia estrellada: (Butler, 1877) [Arthropoda, Insecta, Lepidoptera, Erebidae]
- Orgia japonesa: (Butler, 1877) [Arthropoda, Insecta, Lepidoptera, Erebidae]
- Orgia pintada: (Moore, 1883) [Arthropoda, Insecta, Lepidoptera, Erebidae]
- Oricteropo (cerdo hormiguero): (Sonnini, 1788) [Chordata, Mammalia, Tubulidentata, Orycteropodidae]
- Ornitóptera: (Boisduval, 1832) [Arthropoda, Insecta, Lepidoptera, Papilionidae]
- Ornitóptera común: (Cramer, 1775) [Arthropoda, Insecta, Lepidoptera, Papilionidae]
- Ornitóptera de Brooke: (Wallace, 1855) [Arthropoda, Insecta, Lepidoptera, Papilionidae]
- Ornitóptera de Nueva Guinea: (Gray, 1853) [Arthropoda, Insecta, Lepidoptera, Papilionidae]
- Ornitorrinco: (Shaw, 1799) [Chordata, Mammalia, Monotremata, Ornithorhynchidae]
- Orix: (de Blainville, 1816) [Chordata, Mammalia, Artiodactyla, Bovidae]
- Orix algacel: (Linnaeus, 1758) [Chordata, Mammalia, Artiodactyla, Bovidae]
- Orix beisa: (Rüppell, 1835) [Chordata, Mammalia, Artiodactyla, Bovidae]
- Orix blanco o de arabia: (Linnaeus, 1758) [Chordata, Mammalia, Artiodactyla, Bovidae]
- Orix de penachos: (Gray, 1857) [Chordata, Mammalia, Artiodactyla, Bovidae]
- Orix pasán: (Linnaeus, 1758) [Chordata, Mammalia, Artiodactyla, Bovidae]
- Oropéndola: (Linnaeus, 1766) [Chordata, Aves, Passeriformes, Icteridae]
- Oropéndola castaña: (Gmelin, 1788) [Chordata, Aves, Passeriformes, Icteridae]
- Oropéndola común: (Linnaeus, 1758) [Chordata, Aves, Passeriformes, Oriolidae]
- Oropéndola de cabeza negra: (Müller, 1776) [Chordata, Aves, Passeriformes, Icteridae]
- Oropéndola americana: (Linnaeus, 1758) [Chordata, Aves, Passeriformes, Icteridae]
- Oropéndola crestada: (Hermann, 1783) [Chordata, Aves, Passeriformes, Icteridae]
- Oropéndola de Moctezuma o quíscalo de Moctezuma: (Lesson, 1830) [Chordata, Aves, Passeriformes, Icteridae]
- Ortega (ganga): (Temminck, 1815) [Chordata, Aves, Pterocliformes, Pteroclidae]
- Ortiga (torpedo): (Linnaeus, 1758) [Chordata, Chondrichthyes, Torpediniformes, Torpedinidae]
- Ortiga marina (medusa): (Linnaeus, 1767) [Cnidaria, Scyphozoa, Rhizostomeae, Cassiopeidae]