Oberea, Genus
Obereini, Tribus
Ochlodes, Genus
Ochthera, Genus
Ocypus, Genus
Odacantha, Genus
Odezia, Genus
Odonata, Ordo
Odontopodisma, Genus
Odynerus, Genus
Oecanthinae, Subfamilia
Oecanthus, Genus
Oeciacus, Genus
Oedemera, Genus
Oedemeridae, Familia
Oedipoda, Genus
Oedipodinae, Subfamilia
Oeneis, Genus
Oestridae, Familia
Oestrus, Genus
Ogcodes, Genus
Oiceoptoma, Genus
Oiketicinae, Subfamilia
Olethreutes, Genus
Oligoneuriella, Genus
Oligoneuriidae, Familia
Omocestus, Genus
Omophron, Genus
Omophroninae, Subfamilia
Oncomera, Genus
Onthophagus, Genus
Onychiuridae, Familia
Onychiurinae, Subfamilia
Onychogomphinae, Subfamilia
Onychogomphus, Genus
Opatrum, Genus
Operophtera, Genus
Ophiogomphus, Genus
Opisthograptis, Genus
Oplodonta, Genus
Orchesella, Genus
Orchesellinae, Subfamilia
Orectochillus, Genus
Orgyia, Genus
Orthetrum, Genus
Orthezia, Genus
Orthezidae, Familia
Orthoptera, Ordo
Orthorrhapha, Subordo
Oryctes, Genus
Osmia, Genus
Osmylidae, Familia
Osmylus, Genus
Ostomidae, Familia
Otiorhynchus, Genus
Ourapteryx, Genus
Oxybelus, Genus
Oxycera, Genus
Oxythyrea, Genus