Lepidoptera
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- oa Kemperman & Wilkinson, 1985 Stigmella Nepticulidae
- obatricostellum Ragonot, 1887 Homoeosoma Pyralidae
- obductalis Walker, 1859 Hypena Noctuidae
- obductella (Zeller, 1839) Pempelia Pyralidae
- obeira Hewitson, 1863 Acraea Nymphalidae
- obeira burni Butler, 1896 Acraea Nymphalidae
- obelisca (Denis & Schiffermüller, 1775) Euxoa Noctuidae
- obeliscata (Hübner, 1787) Thera Geometridae
- oberthueri Austaut, 1879 Catocala Noctuidae
- oberthueri Le Cerf, 1916 Callithia Sesiidae
- oberthuri Aurivillius, 1898 Alaena Lycaenidae TYPUS
- oberthuri Butler, 1895 Acraea Nymphalidae
- oberthuri (Culot, 1910) Cucullia Noctuidae
- oberthuri Houlbert, 1921 Saronaga Drepanidae
- oberthuri Karsch, 1894 Catuna Nymphalidae
- oberthuri (Leech, 1900) Euxoa Noctuidae
- oberthuri (Leech, 1890) Loepa Saturniidae
- oberthuri (Rothschild, 1913) Eremodrina Noctuidae
- oberthuri (Rothschild, 1900) Platypterigea Noctuidae
- oberthuri (Staudinger, 1892) Triphaenopsis Noctuidae
- oberthuri (Staudinger, 1892) Peridea Notodontidae
- oberthuri laotopicta Rebel ? Acraea Nymphalidae
- oberthuri nominata Bryk, 1948 Euxoa Noctuidae TYPUS
- oberthuri novoobscurior Bryk, 1948 Euxoa Noctuidae
- oberthurii Boisduval, 1875 Automeris Saturniidae
- oberthurii Deyrolle, 1872 Caligo Nymphalidae
- oberthurii Doherty, 1891 Radena Nymphalidae
- oberthurii erubescens Rothschild, 1917 Catocala Noctuidae
- oberthurii phokilides Fruhstorfer, 1912 Caligo Nymphalidae
- oberthuri monticola Bryk, 1942 Saronaga Drepanidae TYPUS
- oberthuri persica (Boursin, 1942) Caradrina Noctuidae TYPUS
- obesa (Boisduval, 1829) Agrotis Noctuidae
- obesa (Eversmann, 1846) Nyssocnemis Noctuidae
- obesa scytha Alpheraky, 1889 Agrotis Noctuidae
- obesalis Treitschke, 1829 Hypena Noctuidae
- obesata Felder, 1875 Eumelea Geometridae
- obfuscaria (Hübner, 1809) Gnophos Geometridae
- obfuscata (Denis & Schiffermüller, 1775) Gnophos Geometridae
- obfuscata (Scopoli, 1763) Pyrausta Pyralidae
- obfuscata Warren Loxofidonia Geometridae
- obfuscata androgynus Reisser, 1936 Gnophos Geometridae PARATYPUS
- obfuscata myrtillata (Thunberg, 1788) Gnophos Geometridae
- obfuscatus (Denis & Schiffermüller, 1775) Gnophos Geometridae
- oblinita (Smith, 1797) Acronicta Noctuidae
- obliqua Aurivillius, 1913 Planema Nymphalidae TYPUS
- obliqua (Mabille, 1893) Aegoceropsis Agaristidae
- obliqua (Walker, 1865) Bellura Noctuidae
- obliqua (Walker, 1855) Diacrisia Arctiidae
- obliqua Walker, 1865 Gigia Noctuidae
- obliqua (Walker, 1865) Hapigia Notodontidae
- obliqua Walker, 1855 Lonomia Saturniidae
- obliqua (Walker, 1856) Megacorma Sphingidae
- obliqua (Walker, 1855) Pinara Lasiocampidae
- obliqua (Walker, 1865) Spilosoma Arctiidae
- obliqua Warren, 1894 Tycoonia Geometridae
- obliqua (Zeller, 1847) Acrobasis Pyralidae
- obliqua autumnifolia Bryk, 1953 Hapigia Notodontidae TYPUS
- obliqua bergmani Bryk, 1942 Spilarctia Arctiidae TYPUS
- obliqua ursulina Bryk, 1942 Spilarctia Arctiidae TYPUS
- obliquana (Eversmann, 1844) Cochylimorpha Tortricidae
- obliquaria (Fabricius, 1787) Eucorma Zygaenidae
- obliquaria (Turati, 1913) Idaea Geometridae
- obliquata (Grote & Robinson, 1868) Bellura Noctuidae
- obliquefasciata Miyaki ? Diacrisia Arctiidae
- obliquella (Heinemann, 1862) Stigmella Nepticulidae
- obliquifascia Bryk, 1949 Xyleutes Cossidae TYPUS
- obliquifascia Prout, 1918 Synegiodes Geometridae
- obliquifascia Warren Synegia Geometridae
- obliquilineata Warren Semiothisa Geometridae
- obliquiplaga (Moore, 1879) Pseudofentonia Notodontidae
- obliquiplaga roseogrisea Bryk, 1949 Pseudofentonia Notodontidae TYPUS
- obliquisigna (Hampson, 1902) Dichoniopsis Noctuidae
- obliquisigna (Hampson, 1901) Mitrophrys Agaristidae
- obliquozonata (Miyake, 1910) Spilosoma Arctiidae
- oblita Prout, 1913 Prasinocyma Geometridae
- oblitella (Zeller, 1852) Ancylosis Pyralidae
- obliterans Walker, 1858 Ancara Noctuidae
- obliterata (Esper, 1785) Drymonia Notodontidae
- obliterata (Grote, 1864) Leuconycta Noctuidae
- obliterata (Rambur, 1833) Phyllophila Noctuidae
- obliterata (Schaus, 1906) Euglyphis Lasiocampidae
- obliterata (Walker, 1864) Asura Arctiidae
- obliterata (Walker, 1861) Chlorissa Geometridae
- oblonga (Haworth, 1809) Apamea Noctuidae
- oblonga abjecta (Hübner, 1813) Apamea Noctuidae
- oblonga variegata (Staudinger, 1871) Apamea Noctuidae
- oblongana (Haworth, 1811) Endothenia Tortricidae
- obraztsovi Amsel Gypsonoma Tortricidae
- obrinus (Linnaeus, 1764) Nessaea Nymphalidae
- obrinus romani Bryk, 1953 Nesaea Nymphalidae TYPUS
- obrotunda (Guenée, 1852) Paectes Noctuidae
- obscura Aurivillius, 1893 Ludia Saturniidae TYPUS
- obscura Aurivillius, 1901 Mycalesis Nymphalidae TYPUS
- obscura Aurivillius, 1905 Ocinaropsis Lasiocampidae
- obscura Clark, 1934 Chlaenogramma Sphingidae
- obscura Dufay 1958 Abrostola Noctuidae
- obscura (Fabricius, 1775) Erinnyis Sphingidae
- obscura (Guerin-Ménéville, 1829) Cethosia Nymphalidae
- obscura (Haworth, 1809) Apamea Noctuidae
- obscura (Schaus, 1901) Metria Noctuidae
- obscura (Walker, 1855) Pachypasa Lasiocampidae
- obscura Wallengren, 1860 Tipulodes Arctiidae TYPUS
- obscura (Warren, 1896) Stenia Pyralidae
- obscura (Zeller, 1847) Adscita Zygaenidae
- obscurana (Herrich-Schäffer, 1851) Epiblema Tortricidae
- obscurana (Stephens, 1834) Pammene Tortricidae
- obscurans Bryk, 1948 Hydrillodes Noctuidae TYPUS
- obscuraria Leech Trichopteryx Geometridae
- obscuraria (de Villers, 1789) Nychiodes Geometridae
- obscuraria andreasaria Warnecke, 1925 Nychiodes Geometridae
- obscuraria antiquaria Staudinger, 1870 Nychiodes Geometridae
- obscuraria divergaria Staudinger, 1870 Nychiodes Geometridae
- obscuraria elbursica Wehrli, 1937 Nychiodes Geometridae
- obscuraria teriolensis Dannehl, 1927 Nychiodes Geometridae
- obscurata (Butler, 1879) Pangrapta Noctuidae
- obscurata (Denis & Schiffermüller, 1775) Charissa Geometridae
- obscurata Staudinger, 1901 Autophila Noctuidae
- obscurata (Staudinger, 1888) Drasteria Noctuidae
- obscurata (Staudinger, 1871) Epirrita Geometridae
- obscuratana (Wolff, 1955) Dichrorampha Tortricidae
- obscuratus (Fabricius, 1793) Episcada Nymphalidae
- obscuratus sao (Hübner, 1816) Episcada Nymphalidae
- obscurella (Brandt, 1937) Denisia Oecophoridae
- obscurella (Scopoli, 1763) Scythris Scythrididae
- obscurepunctella (Stainton, 1848) Perittia Elachistidae
- obscurior Schaus, 1902 Eudamidas Hesperiidae
- obscuripalpella Kanerva, 1941 Coleophora Coleophoridae
- obscuripennis Frey, 1880 Gelechia Gelechiidae
- obscurus Aurivillius, 1923 Iolaus Lycaenidae TYPUS
- obscurus Mabille, 1876 Tagiades Hesperiidae
- observata Walker Tephrina Geometridae
- obsitalis (Hübner, 1813) Hypena Noctuidae
- obsitaria (Lederer, 1853) Aplocera Geometridae
- obsitaria pseudopallidata (Bytinski-Salz & Brandt, 1937) Aplocera Geometridae TYPUS
- obsoleta Aurivillius, 1925 Archaeopacha Lasiocampidae TYPUS
- obsoleta (Cramer, 1780) Hylesia Saturniidae
- obsoleta (Fabricius, 1793) Helicoverpa Noctuidae
- obsoleta (Fabricius, 1775) Laelia Lymantriidae
- obsoleta (Hübner, 1803) Mythimna Noctuidae
- obsoleta Kiriakoff, 1959 Periergos Notodontidae TYPUS
- obsoleta (Klug, 1830) Anadiasa Lasiocampidae
- obsoleta Tutt, 1899 Zygaena Zygaenidae
- obsoleta (Westwood, 1851) Lymanopoda Nymphalidae
- obsoletalis (Fabricius, 1794) Pyrausta Pyralidae
- obsoletalis (Mann, 1864) Therapne Pyralidae
- obsoletana (Zetterstedt, 1839) Olethreutes Tortricidae
- obsoletaria (Herrich-Schäffer, 1838) Perizoma Geometridae
- obsoletaria (Rambur, 1833) Idaea Geometridae
- obsoletaria violacearia (Staudinger, 1901) Idaea Geometridae
- obsoletella Krogerus, 1947 Blastobasis Blastobasidae
- obsoletella (F. von Röslerstam, 1841) Scrobipalpa Gelechiidae
- obstipata (Fabricius, 1794) Orthonama Geometridae
- obstipata (Fabricius, 1794) Percnoptilota Geometridae
- obtinens Brandt, 1941 Eupithecia Geometridae PARATYPUS
- obtusa (Herrich-Schäffer, 1856) Euglyphis Lasiocampidae
- obtusa (Herrich-Schäffer, 1852) Pelosia Arctiidae
- obtusa Walker, 1855 Oreta Drepanidae
- obtusa javae Watson, 1960 Oreta Drepanidae
- obtusa obtrita (Staudinger, 1857) Pelosia Arctiidae
- obtusa szechwanensis Watson, 1965 Oreta Drepanidae PARATYPUS
- obtusa vatama Moore, 1865 Oreta Drepanidae
- obtusana (Eversmann, 1844) Acleris Tortricidae
- obtusana (Haworth, 1811) Ancylis Tortricidae
- obtusaria (Hübner, 1796) Euchlaena Geometridae
- obtusata Warren Menophra Geometridae
- obtusella (Hübner, 1796) Acrobasis Pyralidae
- obtusella Rebel, 1901 Pleurota Oecophoridae
- obtusus (Walker, 1855) Phasicnecus Eupterotidae
- obumbratana (Lienig & Zeller, 1846) Eucosma Tortricidae
- obvallaria (Mabille, 1867) Scotopteryx Geometridae
- obvertens (Walker, 1858) Massala Noctuidae
- obviella (Denis & Schiffermüller, 1775) Monopis Tineidae
- ocalea (Doubleday, 1847) Corbulis Nymphalidae
- occidentalis (Hampson, 1913) Hypopyra Noctuidae
- occidentalis (Reakirt, 1866) Pontieuchloia Pieridae
- occidentalis (Walker, 1863) Scirpophaga Pyralidae
- occidentalium Aurivillius, 1898 Pentila Lycaenidae TYPUS
- occidentalium Mabille, 1899 Crenis Nymphalidae
- occidentata (Grote, 1883) Mamestra Noctuidae
- occidua (Linnaeus, 1758) Letis Noctuidae
- occitanaria (Duponchel, 1829) Calamodes Geometridae
- occitanica (Esper, 1793) Melanargia Nymphalidae
- occitanica Villers, 1789 Zygaena Zygaenidae
- occitanica albicans Staudinger, 1861 Zygaena Zygaenidae
- occitanica arragonica Holik & Sheljuzhko, 1956 Zygaena Zygaenidae
- occitanica disiuncta Spuler, 1906 Zygaena Zygaenidae
- occitanica pelagia (Oberthür, 1911) Melanargia Nymphalidae
- occitanica plesaura Bellier, 1860 Melanargia Nymphalidae
- occitanica praematura Przegendza, 1932 Melanargia Nymphalidae
- occitanica syllius (Herbst, 1796) Melanargia Nymphalidae
- occitanica vandalitia Burgeff, 1926 Zygaena Zygaenidae
- occulta (Linnaeus, 1758) Eurois Noctuidae
- occulta Rothschild & Jordan, 1903 Protoparce Sphingidae
- occulta extricata (Zetterstedt, 1840) Eurois Noctuidae
- occulta passetii Thierry-Mieg, 1886 Eurois Noctuidae
- occulta septentrionis Eurois Noctuidae
- occulta tibetica Corti & Draudt, 1933 Eurois Noctuidae
- occultella (Linnaeus, 1767) Ectoedemia Nepticulidae
- oceia (Hewitson, 1868) Baoris Hesperiidae
- oceia (Hewitson, 1876) Parnara Hesperiidae
- oceia sikkima Swinhoe, 1890 Parnara Hesperiidae
- ocellana (Denis & Schiffermüller, 1775) Spilonota Tortricidae
- ocellana (Fabricius, 1775) Agonopterix Depressariidae
- ocellaris (Borkhausen, 1792) Xanthia Noctuidae
- ocellaris Walker, 1856 Daphnusa Sphingidae
- ocellaris rubra Bang-Haas Xanthia Noctuidae
- ocellata (Frivaldszky, 1845) Problepsis Geometridae
- ocellata (Holland, 1893) Calliteara Lymantriidae
- ocellata (Moore, 1879) Phocoderma Limacodidae
- ocellata (Linnaeus, 1758) Cosmorhoe Geometridae
- ocellata (Linnaeus, 1758) Smerinthus Sphingidae
- ocellata Tepper, 1890 Grammodes Noctuidae
- ocellata (Walker, 1855) Anthela Anthelidae
- ocellata (Walker, 1867) Dyomyx Noctuidae
- ocellatella (Boyd, 1858) Scrobipalpa Gelechiidae
- ocellea (Haworth, 1811) Euchromius Geometridae
- ocellina (Denis & Schiffermüller, 1775) Chersotis Noctuidae
- ocellinata Guenée Semiothisa Geometridae
- ocelloides Schaus, 1902 Euptychia Nymphalidae
- ochimus (Herrich-Schäffer, 1851) Lycaena Lycaenidae
- ochlea (Boisduval, 1847) Amauris Nymphalidae
- ochlea affinis Aurivillius, 1911 Amauris Nymphalidae
- ochlea brumilleri Lanz, 1895 Amauris Nymphalidae
- ochlea comorana Aurivillius, 1909 Amauris Danainae
- ochlea ochleides Staudinger, 1896 Amauris Nymphalidae
- ochracea Aurivillius, 1895 Mylothris Pieridae TYPUS
- ochracea (Bremer, 1861) Ochlodes Hesperiidae
- ochracea Edwards, 1861 Coenonympha Nymphalidae
- ochracea (Erschov, 1874) Paraegle Noctuidae
- ochracea Lathy, 1906 Henotesia Nymphalidae
- ochracea (Moore, 1883) Oxyplax Limacodidae
- ochracea Walker, 1869 Balacra Thyrididae
- ochracea rikuchina (Butler, 1878) Ochlodes Hesperiidae
- ochracealis (Walker, 1864) Glaucocharis Geometridae
- ochraceata (Staudinger, 1901) Scopula Geometridae
- ochraceator (Walker, 1864) Amastus Arctiidae
- ochraceella (Curtis, 1839) Mompha Momphidae
- ochraceella (Tengström, 1848) Myrmecozela Tineidae
- ochraceogrisearia Bryk, 1944 Epiplema Epiplemidae TYPUS
- ochracina Bryk, 1943 Albara Drepanidae TYPUS
- ochrata Fletcher Eupithecia Geometridae
- ochrata (Scopoli, 1763) Idaea Geometridae
- ochrata cantiata (Prout, 1913) Idaea Geometridae
- ochrata sicula (Zeller, 1847) Idaea Geometridae
- ochrea (Bethune-Baker, 1911) Rivula Noctuidae
- ochrea (Haworth, 1828) Coleophora Coleophoridae
- ochrea (Warren, 1897) Cacochloris Geometridae
- ochreago (Hübner, 1790) Xestia Noctuidae
- ochrealis (Denis & Schiffermüller, 1775) Scoparia Pyralidae
- ochreana (Hübner, 1799) Aphelia Tortricidae
- ochrearia (Leech, 1815) Dalima Geometridae
- ochrearia (Rossi) 1794 Semiaspilates Geometridae
- ochrearia aestiva Schawerda, 1935 Semiaspilates Geometridae
- ochreata Smith, 1890 Cymothoe Nymphalidae
- ochreata (Walker, 1865) Zonoplusia Noctuidae
- ochreipennis (Butler, 1874) Epizygaena Zygaenidae
- ochreosignata Aurivillius, 1910 Athetis Noctuidae
- ochrias Collenette, 1930 Euproctis Lymantriidae
- ochridata Pinker, 1968 Eupithecia Geometridae
- ochrifascialis Chretien Metasia Pyralidae
- ochrifasciella (Ragonot, 1887) Psorosa Pyralidae
- ochrimacula Warren Aphilopota Geometridae
- ochripennella Zeller, 1849 Coleophora Coleophoridae
- ochripes (Moore, 1879) Euzora Lymantriidae
- ochripicta Warren, 1901 Problepsis Geometridae
- ochriplaga Hampson, 1901 Belemnia Arctiidae
- ochrocea (Snellen) ? Crorema Lymantriidae
- ochrocephala Saito, 19 Agonopterix Depressariidae
- ochrodactyla (Denis & Schiffermüller, 1775) Platyptilia Pterophoridae
- ochrogaster (Guenée, 1852) Euxoa Noctuidae
- ochrogaster islandica (Staudinger, 1857) Euxoa Noctuidae
- ochrogaster rossica (Staudinger, 1881) Euxoa Noctuidae
- ochrogaster yarkenda Corti, 1932 Euxoa Noctuidae
- ochroleuca (Denis & Schiffermüller, 1775) Eremobia Noctuidae
- ochroleuca (Felder, 1901) Bombycopsis Lasiocampidae
- ochroleuca asiatica Draudt, 1936 Eremobia Noctuidae
- ochroleuca pelurica Schwingenschuss, 1939 Eremobia Noctuidae
- ochroleucana (Frölich, 1828) Hedya Tortricidae
- ochroleucana Staudinger, 1901 Gelastocera Nolidae
- ochroleucana designata Bryk, 1948 Gelastocera Noctuidae TYPUS
- ochroleucata Herrich-Schäffer, 1847 Scopula Geometridae
- ochroleucata serrans Prout, 1935 Scopula Geometridae
- ochrolinea (Guenée, 1852) Hemeroblemma Noctuidae
- ochromaria (La Harpe, 1852) Nebula Geometridae
- ochroprocta Hampson, 1902 Lophotarsia Noctuidae
- ochroptila Turner, 1923 Monopis Tineidae
- ochrosidera Meyrick, 1922 Sisyrodonta Lecithoceridae TYPUS
- ochrovittata Christoph, 1887 Eupithecia Geometridae
- ochsenheimerella (Hübner, 1813) Nemophora Adelidae
- ochsenheimeri (Boisduval, 1829) Myopsyche Arctiidae
- ochsenheimeri (Lucas, 1853) Salpinx Nymphalidae
- ochsenheimeri Staudinger, 1886 Pieris Pieridae
- ochsenheimeri Zeller, 1847 Zygaena Zygaenidae
- ochsenheimeri aegyptus (Butler, 1866) Salpinx Nymphalidae
- ochsenheimeri rafflesi (Moore, 1883) Salpinx Nymphalidae
- ochsenheimeriana (Lienig & Zeller, 1846) Pammene Tortricidae
- ochsi Boursin, 1940 Cryphia Noctuidae
- ochthoeba (Hampson, 1920) Tamsita Arctiidae
- ockendeni (Druce,) 1911 Lophochorista Geometridae
- ocnerostomella (Stainton, 1850) Tinagma Douglasiidae
- ocnus Butler, 1866 Euptychia Nymphalidae
- ocnus (Eversmann, 1843) Erebia Nymphalidae
- ocnus opima Weymer, 1911 Euptychia Nymphalidae
- ocnus thianschanica Rühl, 1894 Erebia Nymphalidae
- octavia (Cramer, 1777) Precis Nymphalidae
- octavia amestris (Drury, 1773) Precis Nymphalidae
- octavia natalensis Staudinger, 1897 Precis Nymphalidae
- octavia sesamus Trimen, 1883 Precis Nymphalidae
- octo (Guenée, 1852) Amyna Noctuidae
- octo axis (Guenée, 1852) Amyna Noctuidae
- octodurensis (Favre, 1902) Scotopteryx Geometridae
- octodurensis (Oberthür, 1911) Carcharodus Hesperiidae
- octodurensis aelptes Prout, 1937 Scotopteryx Geometridae
- octodurensis albarracina Zerny, 1937 Scotopteryx Geometridae
- octodurensis transmarina Zerny, 1937 Scotopteryx Geometridae
- octogenalis Lederer, 1863 Metasia Pyralidae
- octogenaria (Goeze, 1781) Hoplodrina Noctuidae
- octogenaria amurensis (Staudinger, 1889) Hoplodrina Noctuidae
- octogenaria sericea (Speyer, 1867) Hoplodrina Noctuidae
- octogesa Druce Amnemopsyche Geometridae
- octomaculata (Bremer, 1861) Artona Zygaenidae
- octomaculata (Fabricius, 1775) Alypia Agaristidae
- octomaculata setiaeformis (Felder, 1862) Artona Zygaenidae
- octosperma Diakonoff, 1951 Lecithocera Lecithoceridae TYPUS
- ocularis (Linnaeus, 1767) Tethea Drepanidae
- ocularis amurensis (Bang-Haas, 1913) Tethea Drepanidae
- oculea (Linnaeus, 1761) Amphipoea Noctuidae
- oculea nicticans (Linnaeus, 1767) Amphipoea Noctuidae
- oculella (Thunberg, 1794) Semioscopis Depressariidae
- oculicola Walker, 1858 Grammodes Noctuidae
- oculigera Diakonoff, 1951 Aeolanthes Lecithoceridae TYPUS
- ocultaria (Donovan, 1805) Chrysiphona Geometridae
- ocypete (Bremer, 1861) Fentonia Notodontidae
- ocypete (Fabricius, 1777) Euptychia Nymphalidae
- ocypete (Linnaeus, 1758) Triptogon Sphingidae
- ocypete helle (Cramer, 1780) Euptychia Nymphalidae
- ocypete helle olivacea Bryk, 1953 Euptychia Satyrinae TYPUS
- ocypete japonica Grünberg, 1912 Fentonia Notodontidae
- ocyroe (Dognin, 1890) Euglyphis Lasiocampidae
- odaiensis (Park) ? Goidanichiana Oecophoridae
- odana Godart, 1824 Thaumantis Nymphalidae
- odana Druce, 1886 Deudorix Lycaenidae
- odana cyclops Röber, 1904 Thaumantis Nymphalidae
- odessaria Boisduval, 1848 Lithostege Geometridae
- odessaria subfuscata (Staudinger, 1895) Lithostege Geometridae
- odice (Godart, 1824) Mesosemia Lycaenidae
- odiosa (Butler, 1878) Orthosia Noctuidae
- oditis (Hübner, 1822) Leucochlaena Noctuidae
- oditis hispanica Warren, 1913 Leucochlaena Noctuidae
- oditis intermedia Tutt, 1899 Leucochlaena Noctuidae
- oditis machlyum Turati, 1919 Leucochlaena Noctuidae
- oditis seposita Turati, 1919 Leucochlaena Noctuidae
- odontella Ragonot, 1887 Adelosemia Pyralidae
- odontogramma Prout Ornithospila Geometridae
- odontophora Hampson, 1910 Eublemma Noctuidae
- odorariella Mühlig, 1857 Coleophora Coleophoridae
- odorata (Linnaeus, 1758) Ascalapha Noctuidae
- oedema Guenée, 1852 Anomis Noctuidae
- oedipodea (Swainson, 1820) Hypermnestra Hesperiidae
- oedipodea ataphus (Watson, 1893) Hypermnestra Hesperiidae
- oedipodea consobrina (Plötz, 1884) Hypermnestra Hesperiidae
- oedippus (Fabricius, 1787) Coenonympha Nymphalidae
- oedippus annulifer Butler, 1877 Coenonympha Nymphalidae
- oedippus hungarica Rebel, 1901 Coenonympha Nymphalidae
- oedippus magna Rühl, 1894 Coenonympha Nymphalidae
- oedippus pedemontana Rocci, 1928 Coenonympha Nymphalidae
- oedippus steni Bryk, 1946 Coenonympha Nymphalidae TYPUS
- oedipus Stichel, 1903 Caligo Nymphalidae
- oedipus nocturna Stichel, 1903 Caligo Nymphalidae
- oegrapha (Mabille, 1884) Lomocyma Sphingidae
- oehlmanniella (Hübner, 1796) Incurvaria Incurvariidae
- oeme (Hübner, 1804) Erebia Nymphalidae
- oeme mythia Fruhstorfer, 1917 Erebia Nymphalidae
- oeme noctua Fruhstorfer, 1917 Erebia Nymphalidae
- oeme spodia Staudinger, 1871 Erebia Nymphalidae
- oemilius Doumet, 1859 Cymothoe Nymphalidae
- oenanthe Weymer, 1899 Ithomia Nymphalidae
- oeneus (Fawcett, 1917) Euclaodes Noctuidae
- oenophila Staudinger, 1871 Symmoca Autostichidae
- oenopion (Hübner, 1806) Nephele Sphingidae
- oenopion continentis Rothschild, 1903 Nephele Sphingidae
- oenotrus (Stoll, 1780) Erinnyis Sphingidae
- oeone (Linnaeus, 1758) Precis Nymphalidae
- oeone cebrene Trimen, 1870 Precis Nymphalidae
- oerulea (Guenée, 1852) Arcte Noctuidae
- ofella (Hewitson, 1852) Phyciodes Nymphalidae
- ogasawarae (Matsumura, 1927) Albara Drepanidae
- ogenes (Herrich-Schäffer, 1854) Euglyphis Lasiocampidae
- ogina (Godart, 1824) Discophora Nymphalidae
- ogovensis (Holland, 1893) Leucoma Lymantriidae
- oiclus (Cramer, 1779) Madoryx Sphingidae
- oileus (Felder, 1861) Caligo Nymphalidae
- oileus philademus Staudinger, 1887 Caligo Nymphalidae
- oileus philinos Fruhstorfer, 1903 Caligo Nymphalidae
- oileus phorbas Röber, 1904 Caligo Nymphalidae
- oileus scamander (Boisduval, 1870) Caligo Nymphalidae
- oileus umbratilis Stichel, 1903 Caligo Nymphalidae
- oishiella (Matsumura, 1931) Ectoedemia Nepticulidae
- okakensis (Packard, 1867) Xestia Noctuidae
- okamatonis Matsumura Spatalia Notodontidae
- olane (Hewitson, 1865) Ogyris Lycaenidae
- olbia Prout Scotopteryx Geometridae
- olbiadactyla (Milliere, 1859) Puerphorus Pterophoridae
- oldenlandiae (Fabricius, 1775) Theretra Sphingidae
- oldenlandiae firmata (Walker, 1856) Theretra Sphingidae
- oleae (Bernard, 1788) Prays Yponomeutidae
- oleagina (Denis & Schiffermüller, 1775) Valeria Noctuidae
- olena Weymer, 1875 Aeria Nymphalidae
- olenus Hübner, 1831 Lychnuchus Hesperiidae
- oleracea (Linnaeus, 1758) Lacanobia Noctuidae
- oleracea pallida Bang-Haas Lacanobia Noctuidae
- olerella Zeller, 1854 Depressaria Depressariidae
- oletta Dyar, 1937 Cossula Cossidae
- olga (Swinhoe, 1894) Neoreta Drepanidae
- olinsae Polyommatus Lycaenidae
- olista (Swinhoe, 1893) Ophiusa Noctuidae
- olivacea Aurivillius, 1882 Euptychia Nymphalidae TYPUS
- olivacea Houlbert, 1921 Gaurena Drepanidae
- olivacea Matsumura, 1920 Suzukiana Notodontidae
- olivacea (Moore, 1881) Euplexia Noctuidae
- olivacea (Moore, 1872) Rhagastis Sphingidae
- olivacea (Stephens, 1831) Antitype Noctuidae
- olivacea Warren, 1922 Albara Drepanidae
- olivacea pallidior Warren, 1922 Albara Drepanidae
- olivacella Stainton, 1854 Coleophora Coleophoridae
- olivalis (Denis & Schiffermüller, 1775) Udea Pyralidae
- olivana (Denis & Schiffermüller, 1775) Deltote Noctuidae
- olivana (Treitschke, 1830) Olethreutes Tortricidae
- olivaria (Hampson, 1908) Sasunaga Noctuidae
- olivaria (Leech, 1897) Apeira Geometridae
- olivata (Denis & Schiffermüller, 1775) Colostygia Geometridae
- olivencia Bates, 1862 Mechanitis Nymphalidae
- olivencia huallaga Staudinger, 1884 Mechanitis Nymphalidae
- olivencia juntana Haensch, 1903 Mechanitis Nymphalidae
- oliveomarginata Swinhoe, 1908 Krananda Geometridae
- olivescens Hampson, 1910 Metapioplasta Noctuidae
- oliviella (Fabricius, 1795) Esperia Oecophoridae
- olivieri Boisduval, 1828 Zygaena Zygaenidae
- olivieri kobachiolferi Slaby, 1979 Zygaena Zygaenidae PARATYPUS
- olivieri libanicola Burgeff, 1927 Zygaena Zygaenidae PARATYPUS
- olivina (Herrich-Schäffer, 1852) Copiphana Noctuidae
- olivomaculata Fletcher Carecomotis Geometridae PARATYPUS
- olvina Puplesis, 1984 Ectoedemia Nepticulidae
- olympia (Felder, 1861) Leptophobia Pieridae
- olympiaria (Herrich-Schäffer, 1851) Xenochlorodes Geometridae
- olympica Dierl & Povolny, 1970 Stilbina Noctuidae
- olynthia Felder, 1863 Adelpha Nymphalidae
- olynthia theaena Fruhstorfer, 1915 Adelpha Nymphalidae
- omaia Schaus, 1921 Cossula Cossidae
- omar (Oberthür, 1887) Metopoceras Noctuidae
- omar felix (Standfuss, 1893) Metopoceras Noctuidae
- omelkoi Puplesis, 1984 Stigmella Nepticulidae
- omicraria (Fabricius, 1798) Somatina Geometridae
- omicronigera Guenée, 1852 Sypna Noctuidae
- omissa Rothschild, 1917 Baradesa Notodontidae
- omissa Warren, 1894 Synegia Geometridae
- omissella (Stainton, 1848) Leucospilapteryx Gracillariidae
- omois Hewitson, 1865 Nymphidium Lycaenidae
- omoscopa (Meyrick, 1893) Opogona Tineidae
- omphale (Butler, 1871) Porphyrogenes Hesperiidae
- omphale (Godart, 1819) Colotis Pieridae
- omphale omphaloides Butler, 1876 Colotis Pieridae
- omphale pyrrhopterus Butler, 1894 Colotis Pieridae
- omphale theogone (Boisduval, 1836) Colotis Pieridae
- omrina (Butler, 1870) Heliopetes Hesperiidae
- omrina intensa Draudt, 1923 Heliopetes Hesperiidae
- omrora Trimen, 1894 Acraea Nymphalidae
- omrora umbrata Wichgraf, 1908 Acraea Nymphalidae
- onca Wallengren, 1860 Anthoecia Noctuidae TYPUS
- oncaea Hopffer, 1855 Acraea Nymphalidae
- onega (Hewitson, 1852) Oleria Nymphalidae
- onega epicharme (Felder, 1862) Oleria Nymphalidae
- onega liisa Bryk, 1953 Oleria Ithomiinae TYPUS
- onega perspicua Butler, 1877 Leucothyris Nymphalidae
- onelia (Guenée, 1852) Dysgonia Noctuidae
- onerata Trimen, 1891 Acraea Nymphalidae
- onobrychiella Zeller, 1849 Coleophora Coleophoridae
- onolaus (Kirsch, 1877) Taenaris Nymphalidae
- ononaria (Fuessly, 1783) Aplasta Geometridae
- ononaria faecaturia (Hübner, 1818) Aplasta Geometridae
- ononensis (Bremer, 1861) Chersotis Noctuidae
- ononidella Milliere, 1879 Coleophora Coleophoridae
- ononidis (Zeller, 1839) Parectopa Gracillariidae
- ononis (Denis & Schiffermüller, 1775) Heliothis Noctuidae
- onophis (Felder, 1861) Anaea Nymphalidae
- onopordi (Rambur, 1839) Pyrgus Hesperiidae
- onopordiella Zeller, 1849 Coleophora Coleophoridae
- onosmella (Brahm, 1791) Coleophora Coleophoridae
- onusta Karsch, 1896 Metarbela Metarbelidae
- onustaria (Herrich-Schäffer, 1852) Charissa Geometridae
- onustella (Hübner, 1813) Caloptilia Gracillariidae
- onycha (Hewitson, 1865) Theclinesthes Lycaenidae
- onychinalis (Guenée, 1854) Glyphodes Pyralidae
- onytes (Cramer, 1777) Neritos Arctiidae
- onyx (Moore, 1857) Horaga Lycaenidae
- oo (Linnaeus, 1758) Dicycla Noctuidae LECTOTYPUS
- oo (Stoll, 1782) Pseudoplusia Noctuidae
- oo renago (Haworth, 1809) Dicycla Noctuidae
- oophora Zeller, 1853 Pseudoblabes Arctiidae
- opaca (Kirby, 1890) Liptena Lycaenidae
- opaca (Staudinger, 1899) Mythimna Noctuidae
- opacaria (Hübner, 1819) Compsoptera Geometridae
- opacaria rubra Staudinger, 1870 Compsoptera Geometridae
- opalescellum (Hulst, 1887) Homoeosoma Pyralidae
- opalescens Alpheraky, 1897 Thyatira Drepanidae
- opalifera Dognin, 1911 Colla Apatelodidae
- opalina (Esper, 1793) Calophasia Noctuidae
- opalina (Hewitson, 1854) Euselasia Lycaenidae
- opalina (Kollar, 1844) Condochates Nymphalidae
- opalina (Kollar, 1842) Pantoporia Nymphalidae
- opalina Walker, 1855 Cimola Lymantriidae
- opalina (Walker, 1865) Titya Lasiocampidae
- opalina constricta (Alpheraky, 1889) Condochates Nymphalidae
- opalina constricta Alpheraky, 1889 Pantoporia Nymphalidae
- opalina orientalis Elwes, 1888 Pantoporia Nymphalidae
- opalinoides Guenée, 1852 Acontia Noctuidae
- opalinus (Staudinger, 1897) Cheimas Nymphalidae
- opella (Swinhoe, 1885) Pseudozarba Noctuidae
- operaria (Hübner, 1813) Elophos Geometridae
- operaria hoefneri (Rebel, 1903) Elophos Geometridae
- operatrix Wallengren, 1860 Eurhipia Noctuidae TYPUS
- operbula Dognin Cambogia Geometridae
- opercularis (Abbot & Smith, 1797) Megalopyge Megalopygidae
- operculella (Zeller, 1873) Phthorimaea Gelechiidae
- opheltes (Cramer, 1780) Rhodafra Sphingidae
- ophialis (Treitschke, 1829) Metasia Pyralidae
- ophideresana (Walker, 1863) Heliothela Pyralidae
- ophiogramma (Esper, 1793) Apamea Noctuidae
- ophiogramma maerens (Staudinger, 1882) Apamea Noctuidae
- ophione (Cramer, 1777) Neptidopsis Nymphalidae
- ophione velleda (Mabille, 1889) Neptidopsis Nymphalidae
- ophisa (Cramer, 1782) Euplocamus Tineidae
- ophiusa (Hewitson, 1866) Hypoleucus Hesperiidae
- ophtalmica (Guenée, 1852) Baileya Noctuidae
- ophthalmicana (Hübner, 1799) Epinotia Tortricidae
- opigena (Drury, 1773) Hemeroblemma Noctuidae
- opima (Hübner, 1809) Orthosia Noctuidae
- opinatus (Drury, 1782) Charaxes Nymphalidae
- opis (Butler, 1878) Lomaspilis Geometridae
- opis (Drury, 1773) Cynandra Nymphalidae
- opis (Schaus, 1892) Phricodia Saturniidae
- opis amurensis Wehrli, 1938 Lomaspilis Geometridae
- opis nigrita Wehrli, 1939 Lomaspilis Geometridae
- opisodisticha Wehrli, Orthostixis Geometridae
- opisodisticha parvipuncta Prout Orthostixis Geometridae
- opisoleuca (Staudinger, 1881) Protexarnis Noctuidae
- oplismeniella Kemperman & Wilkinson, 1985 Stigmella Nepticulidae
- oporana (Linnaeus, 1758) Archips Tortricidae
- oppellii (Latreille, 1811) Perisama Nymphalidae
- oppellii amalia Oberthür, 1916 Perisama Nymphalidae
- oppleta Warren, 1907 Racheospila Geometridae
- oppletella (Herrich-Schäffer, 1854) Chionodes Gelechiidae
- opponens (Walker, 1864) Pseudaclytia Arctiidae
- opposita (Lederer, 1870) Cleonymia Noctuidae
- opposita Wallengren, 1860 Pandesma Noctuidae TYPUS
- oppositaria Leech, 1891 Alloharpina Geometridae
- oppositaria (Mann, 1864) Eumannia Geometridae
- oppositella auct. Bryotropha Gelechiidae
- oppressana (Treitschke, 1835) Gypsonoma Tortricidae
- optabilis (Boisduval, 1834) Cladocerotis Noctuidae
- optata (Godart, 1826) Catocala Noctuidae
- optata selecta Boisduval, 1840 Catocala Noctuidae
- optilete (Knoch, 1781) Plebeius Lycaenidae
- optilete cyparissus (Hübner, 1813) Plebeius Lycaenidae
- optilete daisetsuzana (Matsumura, 1927) Plebeius Lycaenidae
- optilete kurilensis (Matsumura, 1926) Plebeius Lycaenidae
- optilete nemoptilete Bryk, 1942 Lycaena Lycaenidae TYPUS
- optilete sibirica Staudinger, 1892 Plebeius Lycaenidae
- optilete uralensis Seitz, 1909 Plebeius Lycaenidae
- optima Butler, 1874 Callithea Nymphalidae
- optima eminens Röber, 1915 Callithea Nymphalidae
- opulenta Brandt, 1941 Dichagyris Noctuidae TYPUS
- opulenta (Christoph, 1877) Hypena Noctuidae
- opulentellus (Zeller, 1852) Hednota Geometridae
- or (Denis & Schiffermüller, 1775) Tethea Drepanidae
- orana Duponchel, 1835 Zygaena Zygaenidae
- orana (F. von Röslerstam, 1834) Adoxophyes Tortricidae
- orana sardoa Mabille, 1892 Zygaena Zygaenidae
- oranaria (Bang-Haas, 1906) Euxoa Noctuidae
- orbicularis (Walker, 1865) Agrotis Noctuidae
- orbicularis Walker, 1854 Peridrome Aganaidae
- orbiculosa (Esper, 1799) Oxytripia Noctuidae
- orbifer (Hübner, 1823) Spialia Hesperiidae
- orbifer lugens (Staudinger, 1886) Spialia Hesperiidae
- orbifera Butler, 1868 Lasiophila Nymphalidae
- orbifera Walker, 1857 Magusa Noctuidae
- orbifera (Walker, 1858) Thyas Noctuidae
- orbigera (Guenée, 1852) Donuca Noctuidae
- orbitella Zeller, 1849 Coleophora Coleophoridae
- orbitulus (Prunner, 1798) Plebeius Lycaenidae
- orbitulus lehanus (Moore, 1878) Plebeius Lycaenidae
- orbitulus morsheadi (Eversmann, 1844) Plebeius Lycaenidae
- orbitulus obsoleta Nordström, 1934 Lycaena Lycaenidae TYPUS
- orbitulus pheretimus (Staudinger, 1892) Plebeius Lycaenidae
- orbona (Geyer, 1832) Dixeia Pieridae
- orbona (Hufnagel, 1766) Noctua Noctuidae
- orbona (Vollenhofen, 1863) Asota Aganaidae
- orbona robusta Turati Noctua Noctuidae
- orbona vidua (Butler, 1899) Dixeia Pieridae
- orcas (Drury, 1782) Aphnaeus Lycaenidae
- orchus (Hewitson, 1851) Pronophila Nymphalidae
- orciferalis (Walker, 1859) Macrochilo Noctuidae
- orciferaria Walker, 1860 Cyclidia Cyclidiidae
- orciferaria diffusa Bryk, 1943 Cyclidia Cyclidiidae TYPUS
- orcinus (Felder, 1867) Udranomia Hesperiidae
- orcus (Latreille, 1804) Pronophila Nymphalidae
- orea (Hübner, 1823) Epiphile Nymphalidae
- orea iblis Felder, 1861 Epiphile Nymphalidae
- oreas (Leech, 1892) Celastrina Lycaenidae
- oreas Sharpe, 1891 Acraea Nymphalidae
- oreas (Weymer, 1899) Corbulis Nymphalidae
- orectis Meyrick, 1890 Dichromodes Geometridae
- oreina Dufay, 1984 Chersotis Noctuidae
- orejoni Agenjo, 1951 Agrochola Noctuidae
- orellana Hewitson, 1852 Papilio Papilionidae
- oreon Doherty, 1891 Papilio Papilionidae
- orestes (Cramer, 1780) Nymula Lycaenidae
- orestes de Prins & Poorten, 1981 Pseudochazara Nymphalidae
- orestia Hewitson, 1874 Acraea Nymphalidae
- orestia transita Eltringham, 1912 Acraea Nymphalidae
- orgetorix (Hewitson, 1870) Catoblepia Nymphalidae
- orgia Hewitson, 1874 Thecla Lycaenidae
- oriana (Hewitson, 1858) Hypoleria Nymphalidae
- oriana orianula Bryk, 1953 Hypoleria Ithomiinae TYPUS
- oribazus Boisduval, 1836 Papilio Papilionidae
- orichalcea (Fabricius, 1775) Trichoplusia Noctuidae
- orichalcea Stainton, 1861 Cosmopterix Cosmopterigidae
- orientalis (Alphéraky, 1882) Lasionycta Noctuidae
- orientalis Alphéraky, 1876 Scopula Geometridae
- orientalis Elwes, 1900 Erebia Nymphalidae
- orientalis (Eversmann, 1851) Evergestis Pyralidae
- orientalis Hampson Panthea Pantheidae
- orientalis Kemperman & Wilkinson, 1985 Stigmella Nepticulidae
- orientalis Mann, 1862 Acronicta Noctuidae
- orientalis (Murray, 1875) Neozephyrus Lycaenidae
- orientalis Petersen, 1961 Nemapogon Tineidae
- orientalis Rebel Phycodes Brachodidae
- orientalis Reverdin, 1913 Carcharodus Hesperiidae
- orientalis (Staudinger, 1897) Calospilos Geometridae
- orientalis Staudinger, 1901 Schrankia Noctuidae
- orientalis chosenicola Bryk, 1946 Ruralis Lycaenidae TYPUS
- orientalis hecalina Bryk, 1946 Ruralis Lycaenidae TYPUS
- orientana (Alpheraky, 1876) Cnephasia Tortricidae
- orientana (Caradja, 1916) Epiblema Tortricidae
- orientella Amsel, 1954 Euzophera Pyralidae
- orientella Klimesch, 1953 Levarchama Nepticulidae
- orientellus (Herrich-Schäffer, 1850) Catoptria Geometridae
- orientes Brandt, 1938 Hypenodes Noctuidae TYPUS
- orientis Karsch, 1894 Euriphene Nymphalidae
- origalis Brandt, 1941 Glossotrophia Geometridae TYPUS
- originalis (Herrich-Schäffer, 1856) Eurrhypis Pyralidae
- orima Druce, 1906 Cossula Cossidae
- orina Hewitson, 1874 Acraea Nymphalidae
- orina nigroapicalis Aurivillius, 1893 Acraea Nymphalidae TYPUS
- orina (Guenée, 1852) Elaphria Noctuidae
- orina orinata Oberthür, 1893 Acraea Nymphalidae
- orina orineta Eltringham, 1912 Acraea Nymphalidae
- orinophragma Prout Antharmostes Geometridae
- oriolella Zeller, 1849 Coleophora Coleophoridae
- orion (Fabricius, 1775) Historis Nymphalidae
- orion (Pallas, 1771) Scolitantides Lycaenidae
- orion coreana (Matsumura, 1926) Scolitantides Lycaenidae
- orion metioche (Fruhstorfer, 1910) Scolitantides Lycaenidae
- orion orithyia (Grum-Grschimailo, 1891) Scolitantides Lycaenidae
- orion ornata (Staudinger, 1892) Scolitantides Lycaenidae
- orion wahlgreni Bryk, 1946 Scolitantides Lycaenidae TYPUS
- orionalis Walker, 1859 Dausara Pyralidae
- oriphylax Meyrick, 1924 Monopis Tineidae TYPUS
- orise (Boisduval, 1836) Dismorphia Pieridae
- orithya (Linnaeus, 1767) Precis Nymphalidae
- orithya (Linnaeus, 1758) Alcyoneis Nymphalidae
- orithya albicincta Butler, 1875 Precis Nymphalidae
- orithya here Lang, 1884 Precis Nymphalidae
- orithya isocratia (Hübner, 1811) Alcyoneis Nymphalidae
- orithya isocratia (Hübner, 1824) Precis Nymphalidae
- orithya madagascariensis Guenée, 1865 Precis Nymphalidae
- orithya minagara Fruhstorfer, 1904 Precis Nymphalidae
- orithya novaguineae Lang 1884 Precis Nymphalidae
- orithya ocyale (Hübner, 1824) Precis Nymphalidae
- orithya patenas Fruhstorfer, 1912 Precis Nymphalidae
- orithya Swinhoe,i Butler, 1885 Precis Nymphalidae
- oritropha Fletcher Aphilopota Geometridae PARATYPUS
- orizaba (Westwood, 1853) Rothschildia Saturniidae
- orleans Oberthür, 1890 Parnassius Papilionidae
- orleans bourboni Bang-Haas, 1928 Parnassius Papilionidae
- ormuzdella Amsel, 1954 Ancylosis Pyralidae
- ornata Brandt, 1938 Armada Noctuidae TYPUS
- ornata (Bremer, 1864) Panchrysia Noctuidae
- ornata Dognin, 1911 Eugivira Cossidae
- ornata Gaede, 1928 Diastemina Notodontidae
- ornata (Leech, 1900) Cymatophorima Drepanidae
- ornata Oberthür, 1884 Spatalia Notodontidae
- ornata (Scopoli, 1763) Scopula Geometridae
- ornata Walker, 1865 Rigema Notodontidae
- ornatalis (Duponchel) 1832 Hydridis Pyralidae
- ornataria Leech, 1891 Hypomecis Geometridae
- ornataria Leech, 1815 Macaria Geometridae
- ornataria chosenicola Bryk, 1948 Boarmia Geometridae TYPUS
- ornatella (Denis & Schiffermüller, 1775) Pempeliella Pyralidae
- ornatella Puplesis, 1984 Ectoedemia Nepticulidae
- ornatipennella (Hübner, 1796) Coleophora Coleophoridae
- ornatissima (Walker, 1858) Antoculeora Noctuidae
- ornatrix (Linnaeus, 1758) Utetheisa Arctiidae
- ornatus Mabille, 1890 Cupido Lycaenidae
- ornatus Rothschild, 1894 Hemeroplanes Sphingidae
- ornatus vestalis Aurivillius, 1895 Cupido Lycaenidae TYPUS
- orneates Druce, 1897 Automeris Saturniidae
- ornicella Friese, 1960 Paraswammerdamia Yponomeutidae
- ornioptena Karsch, 1893 Ludia Saturniidae
- ornithogalli (Guenée, 1852) Spodoptera Noctuidae
- ornithopodella (Frey, 1859) Biselachista Elachistidae
- ornithopteralis (Guenée, 1854) Uresiphita Pyralidae
- ornitopus (Hufnagel, 1766) Lithophane Noctuidae
- ornitopus lacteipennis Dadd. Lithophane Noctuidae
- ornythion Boisduval, 1836 Papilio Papilionidae
- oroatis Hewitson, 1864 Mycalesis Nymphalidae
- orobana (Treitschke, 1830) Cydia Tortricidae
- orobi (Stainton, 1870) Leucoptera Lyonetiidae
- orolina (Hewitson, 1860) Corbulis Nymphalidae
- oropotamica (Wiltshire, 1941) Agrochola Noctuidae
- orotavensis Rebel, 1896 Coleophora Coleophoridae
- oroyana (Dognin, 1923) Nesara Lasiocampidae
- oroyanum Rothschild, 1911 Cosmosoma Arctiidae
- orpheus (Felder, 1862) Cheritra Lycaenidae
- orpheus (Felder, 1860) Drupadia Lycaenidae
- orpheus eurydice (Fabricius, 1775) Cheritra Lycaenidae
- orphnata Bohatsch, 1883 Eupithecia Geometridae
- orphnata W.Petersen, 1909 Eupithecia Geometridae
- orseis Edwards, 1863 Phyciodes Nymphalidae
- orsilochus (Cramer, 1775) Podalia Megalopygidae
- orsilochus (Fabricius, 1775) Megalura Nymphalidae
- orsilochus major Schaus, 1905 Podalia Megalopygidae
- orsis (Drury, 1782) Myscelia Nymphalidae
- orstadii Palm, 1943 Elachista Elachistidae
- orthodice (Weymer, 1890) Tatochila Pieridae
- orthographus Rothschild & Jordan, 1903 Polyptychus Sphingidae
- orthozona (Hampson, 1902) Ozarba Noctuidae
- orthrus Trimen, 1874 Phasis Lycaenidae
- ortneri (Klimesch, 1951) Levarchama Nepticulidae
- ortygia (Druce, 1887) Anticla Apatelodidae
- ortygia (Druce, 1876) Scada Nymphalidae
- ortygnus (Cramer, 1775) Thecla Lycaenidae
- oruba Schaus, 1892 Halysidota Arctiidae
- orus (Cramer, 1777) Heodes Lycaenidae
- osbecki Aurivillius, 1882 Phasis Lycaenidae TYPUS
- oscarus (Eversmann, 1844) Boloria Nymphalidae
- oscarus australis (Graeser, 1878) Boloria Nymphalidae
- oscarus maxima (Fixsen, 1887) Boloria Nymphalidae
- oschritinctalis Hampson, 1919 Schoenobius Pyralidae
- oscula ? Celaenorrhinus Hesperiidae
- oscullata Hulst Euphyia Geometridae
- osiris (Dalman, 1823) Hippotion Sphingidae TYPUS
- osiris Hopffer, 1855 Cupido Lycaenidae
- osiris (Meigen, 1829) Cupido Lycaenidae
- osmanella Amsel, 1953 Pterothrixidia Pyralidae PARATYPUS
- osmiaeformis (Herrich-Schäffer, 1852) Chamaesphecia Sesiidae
- osmophora Hampson, 1901 Amaxia Arctiidae
- osseana (Scopoli, 1763) Eana Tortricidae
- osseella (Stainton, 1861) Psamathocrita Gelechiidae
- osseellus Hampson, 1900 Agriphila Geometridae
- osseogrisea Berio, 1973 Mythimna Noctuidae TYPUS
- osseola (Staudinger, 1882) Hydraecia Noctuidae
- ossicolor (Warren, 1912) Leucania Noctuidae
- ossicolor Warren, 1897 Scopula Geometridae
- ossiculata (Lederer, 1853) Idaea Geometridae
- ossularia (Hübner, 1837) Lobocleta Geometridae
- ostentosaria (Möschler, 1867) Chiasmia Geometridae
- osteochroa (Turner, 1898) Chezala Oecophoridae
- osteodactylus (Zeller, 1841) Hellinsia Pterophoridae
- osteria (Westwood, 1850) Eulaceura Nymphalidae
- osterodensis Reiss, 1921 Zygaena Zygaenidae
- osterodensis asiatica Burgeff, 1926 Zygaena Zygaenidae
- osterodensis curvata Burgeff, 1926 Zygaena Zygaenidae
- osterodensis kenteina Burgeff, 1926 Zygaena Zygaenidae
- osterodensis matrana Burgeff, 1926 Zygaena Zygaenidae
- osterodensis meshemerina Burgeff, 1926 Zygaena Zygaenidae
- osterodensis tenuicurva Burgeff, 1926 Zygaena Zygaenidae
- osthelderi (Brandt) Cymatophorima Drepanidae PARATYPUS
- osthelderi Boursin, 1940 Autophila Noctuidae
- osthelderi Boursin, 1951 Agrochola Noctuidae
- osthelderi Heath, 1975 Micropterix Micropterigidae
- osthelderi (De Lattin, 1950) Catoptria Geometridae
- osthelderi Pfeiffer Spialia Hesperiidae
- osthelderi (Wehrli, 1932) Idaea Geometridae
- osthelderi gecko Evans Spialia Hesperiidae
- ostia Swinhoe, 1902 Eloasa Limacodidae
- ostracina Wallengren, 1860 Gnathostypsis Sphingidae TYPUS
- ostrina (Hübner, 1808) Eublemma Noctuidae
- ostrina aestivalis (Guenée, 1852) Eublemma Noctuidae
- ostrina carthami Herrich-Schäffer, 1851 Eublemma Noctuidae
- ostrina suffusa Warren, 1913 Eublemma Noctuidae
- ostrinalis (Hübner, 1796) Pyrausta Pyralidae
- ostrinana (Guenée, 1845) Diceratura Tortricidae
- ostrinaria (Hübner, 1813) Idaea Geometridae
- osyridella (Stainton, 1869) Kessleria Yponomeutidae
- osyris (Staudinger, 1875) Ebrietas Hesperiidae
- othona (Hewitson, 1865) Chliaria Lycaenidae
- otiosa Guenée, 1852 Polydesma Noctuidae
- otis (Fabricius, 1775) Zizera Lycaenidae
- otitae Zeller, 1839 Coleophora Coleophoridae
- oto (Hewitson, 1854) Hypoleria Nymphalidae
- otolais Bates, 1865 Pyrrhogyra Nymphalidae
- otraeda Hewitson, 1863 Deudorix Lycaenidae
- otregiata (Metcalfe, 1917) Lampropteryx Geometridae
- otregiata dubitatrix Bryk, 1942 Cidaria Geometridae TYPUS
- otrere (Hübner, 1825) Anaea Nymphalidae
- otreus (Stoll, 1780) Ephyriades Hesperiidae
- ottomana Herrich-Schäffer, 1847 Erebia Nymphalidae
- ottomana balcanica Rebel, 1913 Erebia Nymphalidae
- ottomanus (Lefebvre, 1830) Lycaena Lycaenidae
- otus (Drury, 1773) Pachypasa Lasiocampidae
- otus fulvescens Kotzsch, 1932 Pachypasa Lasiocampidae
- ou (Guenée, 1852) Rachiplusia Noctuidae
- oubie (Guérin-Méneville 1849) Gonimbrasia Saturniidae
- ouida Hewitson, 1865 Dodona Nymphalidae
- oulita (Hewitson, 1858) Hypothyris Nymphalidae
- oulita metella (Hopffer, 1874) Hypothyris Nymphalidae
- ouocco Dyar, 1914 Eulepidotis Noctuidae
- ovata Grote, 1873 Acronicta Noctuidae
- ovialis (Walker, 1859) Syllepsis Pyralidae
- oviduca (Guenée, 1852) Protorthodes Noctuidae
- oxalina (Hübner, 1803) Mesogona Noctuidae
- oxione (Hewitson, 1874) Euriphene Nymphalidae
- oxleyi (Newman, 1855) Doratifera Limacodidae
- oxyacanthae (Frey, 1856) Phyllonorycter Gracillariidae
- oxyacanthae (Linnaeus, 1758) Allophyes Noctuidae
- oxyacanthella (Stainton, 1854) Stigmella Nepticulidae
- oxybiata (Milliere, 1872) Xanthorhoe Geometridae
- oxybiella Amsel, 1950 Nephopteryx Pyralidae TYPUS
- oxybiella (Milliere, 1872) Symmocoides Autostichidae
- oxycedrata Rambur, 1833 Eupithecia Geometridae
- oxycedrata provinciata Milliére, 1874 Eupithecia Geometridae
- oxycedrella (Milliere, 1871) Brachyacma Gelechiidae
- oxycyma (Meyrick, 1937) Taftania Pyralidae
- oxydactylus (Staudinger, 1859) Marasmarcha Pterophoridae
- oxyechus Clarke, 1962 Fernandocrambus Geometridae PARATYPUS
- oxygala (Grote, 1881) Aletia Noctuidae
- oxygramma Brandt, 1938 Boursinia Noctuidae TYPUS
- oxytropis Boisduval, 1828 Zygaena Zygaenidae
- oxytropis acticola Burgeff, 1926 Zygaena Zygaenidae
- oxytropis laterubra Verity, 1920 Zygaena Zygaenidae
- oxytropis quercii Verity, 1920 Zygaena Zygaenidae
- ozia (Hewitson, 1870) Pteronymia Nymphalidae
- ozia medelina Haensch, 1909 Pteronymia Nymphalidae
- ozomene (Godart, 1847) Actinote Lycaenidae
- ozomene calimene Rebel, 1901 Actinote Lycaenidae