10234 | oaklandiae McDunnough, Anarta, [Scotogramma] | 932840 | |
9290 | oaklandiae Barnes & McDunnough, Cryphia, [Cerma] | 932198 | |
10451 | oaxacana Schaus, Leucania | 932952 | |
| oaxacana Schaus, Dichagyris, [Agrotis] | 933234 | |
9130 | obatra Morrison, Spragueia, [Tarache] | 931390 | |
| obaurata Morrison, Nola, [Eustrotia] | 931129 | |
| obditalis Walker, Hypena | 930583 | |
10817 | obeliscoides Guenée, Euxoa, [Agrotis] | 933428 | |
10818 | oberfoelli Hardwick, Euxoa | 933429 | |
| obesalis Stephens, Hypena, [Plathypena] | 930588 | |
| obesula Smith, Anarta– ssp., [Mamestra] | 932836 | |
10231 | obesula Smith, Anarta, [Mamestra] | 932836 | |
| objurgata Smith, Euxoa, [Carneades] | 933395 | |
10947 | oblata Morrison, Xestia, [Agrotis] | 933575 | |
9272 | oblinita Smith, Acronicta, [Phalaena] | 931485 | |
| obliqua Walker, Bellura– ssp., [Edema] | 932517 | |
| obliqua Smith, Phuphena, [Fagitana] | 932212 | |
10660 | obliqua Smith, Agrotis, [Feltia] | 933522 | |
9512 | obliqua Harvey, Hydraecia, [Gortyna] | 932456 | |
| obliqua Todd, Orodesma | 930917 | |
7983 | obliqua Packard, Heterocampa | 930075 | |
9819 | obliqua Smith, Amolita | 931061 | |
9525 | obliqua Walker, Bellura, [Edema] | 932517 | |
8699 | obliqua Guenée, Zale, [Homoptera] | 931034 | |
11196 | obliqua Smith, Schinia | 932167 | |
8483 | obliqualis Dyar, Phytometra, [Antarchaea] | 930719 | |
| obliqualis Fabricius, Eublemma, [Phalaena] | 930695 | |
8477 | obliqualis Edwards, Hemeroplanis, [Pleonectyptera] | 930711 | |
| obliquata Smith, Schinia, [Heliophana] | 932180 | |
| obliquata Smith, Pleromelloida, [Pleroma] | 931777 | |
8302 | obliquata Grote & Robinson, Dasychira, [Parorgyia] | 930154 | |
| obliquata Grote & Robinson, Bellura, [Arzama] | 932517 | |
| obliquata Barnes & McDunnough, Nola, [Celama] | 931137 | |
| obliquella Strand, Spragueia | 931391 | |
| obliquifera Walker, Balsa | 931417 | |
| obliquilinea Walker, Hemiceras, [Comidava] | 930054 | |
| obliquirena Hampson, Bryolymnia, [Calymniodes] | 932243 | |
10427 | oblita Grote, Trichocerapoda, [Oncocnemis] | 933083 | |
8174 | obliterata Stretch, Holarctia, [Arctia] | 930239 | |
| obliterata Schwarz, Catocala | 930856 | |
| obliterata Grote, Leuconycta, [Microcoelia] | 932026 | |
| obliviosa Edwards, Orgyia | 930168 | |
| obliviosa Walker, Agroperina, excluded | 990040 | |
9449 | oblonga Grote, Capsula, [Nonagria] | 932438 | |
10834 | oblongistigma Smith, Euxoa, [Agrotis] | 933444 | |
| obnigra Smith, Lacinipolia, [Mamestra] | 933062 | |
| Obrima Walker | 931072 | |
| obrotunda of authors, Paectes, [Ingura], not Guenée, 1852 | 931117 | |
| obscura Frey, Xestia, [Agrotis] | 933596 | |
| obscura Goldschmidt, Lymantria | 930141 | |
8518 | obscura Grote, Gabara, [Scolecocampa] | 930639 | |
| obscura Smith, Plagiomimicus, gender-conform | 932707 | |
| obscura Hill, Euxoa | 933415 | |
| obscura Barnes & McDunnough, Apamea, [Protagrotis] | 932355 | |
| obscura Riley, Spodoptera, [Laphygma] | 932216 | |
| obscura Edwards, Acronicta– ssp., [Apatela] | 931421 | |
| obscura Draudt, Catocala | 930829 | |
8784 | obscura Strecker, Catocala | 930773 | |
| obscura Haworth, Apamea, [Noctua], dark form | 932309 | |
10290 | obscura Smith, Orthodes, [Mamestra] | 933142 | |
| obscura Stretch, Virbia, [Crocata] | 930297 | |
| obscura Dyar, Cerma, [Chamyris] | 931501 | |
| obscurata Strecker, Schinia– ssp. | 932119 | |
| obscurata Schnaider, Lymantria | 930141 | |
10136 | obscurata Barnes & McDunnough, Sympistis, [Oncocnemis] | 931885 | |
11118 | obscurata Strecker, Schinia | 932119 | |
| obscurebrunnea Strand, Micrathetis | 932031 | |
10051 | obscurella Barnes & McDunnough, Leucocnemis | 931620 | |
| obscureobrunnea McDunnough, Micrathetis, misspelled | 932031 | |
9996.1 | obscurifascia Troubridge & Lafontaine, Brachylomia | 932658 | |
| obscurior Smith, Cucullia | 931508 | |
8681 | obscurior Franclemont & Todd, Matigramma | 931007 | |
| obscurior Smith, Dargida– ssp., [Leucania] | 932928 | |
| obscurior Smith, Lacinipolia, [Mamestra] | 933053 | |
8347 | obscuripennis Grote, Zanclognatha, [Herminia] | 930494 | |
| obscuroides Poole, Apamea– ssp. | 932355 | |
| obscurus Smith, Sutyna– ssp., [Anytus] | 932707 | |
10003 | obscurus Smith, Epidemas | 932651 | |
| obscurus Dognin, Eriopyga, [Agrotis] | 933162 | |
| observabilis Grote, Parabagrotis, [Agrotis] | 933643 | |
8686.1 | obsita Guenée, Zale, [Homoptera] | 931020 | |
| obsolescens Brower, Platarctia, [Hyphoraia] | 930288 | |
| obsolescens Strand, Papaipema | 932503 | |
| obsoleta Wnukowsky, Lymantria | 930141 | |
| obsoleta Worthington, Catocala | 930792 | |
| obsoleta Grote, Ponometia, [Fruva] | 931326 | |
| obsoleta Fabricius, Helicoverpa, [Bombyx] | 932045 | |
| obsoleta Smith, Zanclognatha | 930492 | |
| obsoleta Grote, Argyrostrotis, [Poaphila] | 930954 | |
| obstructa Walker, Amyna, [Celaena] | 931253 | |
| obtectalis Möschler, Hypena | 930580 | |
9418 | obtusa Smith, Oligia, [Helotropha] | 932385 | |
9725 | obtusa Herrich-Schäffer, Azenia, [Metoponia] | 931724 | |
10189 | obtusa Smith, Supralathosea, [Cucullia] | 931574 | |
| obtusa Walker, Goniapteryx, [Rhescipha] | 930633 | |
| obtusa Speyer, Xestia, [Agrotis] | 933573 | |
| obtusa Smith, Trichopolia, [Taeniocampa] | 933184 | |
| obtusula Zeller, Azenia, [Metoponia] | 931724 | |
| Obucola Walker | 930754 | |
| obversa Walker, Ptichodis, [Poaphila] | 930932 | |
8586 | obvertens Walker, Massala, [Azeta] | 931088 | |
| obvia Schwarz, Catocala | 930773 | |
| obvia Walker, Eucoptocnemis, [Graphiphora] | 933257 | |
| ocacensis Hampson, Xestia, [Episilia] | 933604 | |
10101 | occata Grote, Sympistis, [Cleophana] | 931801 | |
| occidens Hampson, Xestia, [Aplectoides] | 933578 | |
9346 | occidens Grote, Apamea, [Hadena] | 932332 | |
| occidenta Grote, Mamestra, [Copimamestra] | 932898 | |
| occidentalis Grote & Robinson, Acronicta, [Acronycta] | 931454 | |
8334.1 | occidentalis Smith, Idia, [Helia] | 930483 | |
7939 | occidentalis Lintner, Furcula, [Cerura] | 930027 | |
| occidentalis French, Lophocampa– ssp., [Halisidota] | 930365 | |
| occidentalis Rothschild, Halysidota, [Halisidota] | 930363 | |
| occidentalis Lintner, Furcula– ssp., [Cerura] | 930027 | |
| occidentalis French, Leptarctia | 930336 | |
| occidentalis Hawks, Catocala– ssp. | 930825 | |
10781.1 | occidentalis Lafontaine & Byers, Euxoa | 933410 | |
| occluna Smith, Protorthodes, [Taeniocampa] | 933111 | |
| occulatrix of authors, Paectes, misspelled | 931106 | |
8619 | occulta Edwards, Drasteria, [Syneda] | 930892 | |
| occulta Linnaeus, Eurois– ssp., [Phalaena] | 933560 | |
10929 | occulta Linnaeus, Eurois, [Phalaena] | 933560 | |
10427.1 | oceanis Robertson & Mustelin, Trichocerapoda | 933084 | |
9830 | ocellata Barnes & McDunnough, Walterella, [Prothrinax] | 931604 | |
9740 | ochoa Barnes, Plagiomimicus, [Stibadium] | 931646 | |
| ochracea Möschler, Spragueia, [Emmelia] | 931392 | |
| ochracea Neumögen, Grammia | 930255 | |
| ochracea Wnukowsky, Lymantria | 930141 | |
10367 | ochracea Riley, Psammopolia, [Xylomiges] | 933015 | |
| ochracea Cockerell, Helicoverpa | 932045 | |
8626 | ochracea Behr, Drasteria, [Syneda] | 930898 | |
| ochracea Stretch, Platyprepia, [Euprepia] | 930289 | |
| ochracea Cassino, Apantesis | 930279 | |
| ochracea Smith, Andropolia, excluded | 990041 | |
| ochracea Stretch, Grammia, [Arctia] | 930271 | |
| ochracea Smith, Emarginea, [Cyathissa] | 931606 | |
| ochracearivulosa Stretch, Grammia, [Arctia] | 930271 | |
| ochraceus Edwards, Axenus | 931733 | |
9839 | ochrea Barnes & McDunnough, Aleptinoides | 931731 | |
| ochrea Grote, Caenurgina, [Drasteria] | 930923 | |
| ochreago Borkhausen, Xanthia, preoccupied | 932622 | |
| ochreata Butler, Apantesis, [Arctia] | 930280 | |
| ochreata Barnes & McDunnough, Notodonta– ssp. | 930015 | |
| ochreifascia Grote, Melipotis, [Bolina] | 930871 | |
| ochreifascia Smith, Schinia | 932179 | |
| ochreipennis Harvey, Melipotis, [Bolina] | 930871 | |
| ochreipennis Grote, Zanclognatha, [Herminia] | 930500 | |
| ochreous Meadows, Pseudohemihyalea, [Hemihyalea] | 930381 | |
| Ochria Grote | 932464 | |
| ochricosta Herrich-Schäffer, Ponometia | 931335 | |
10638 | ochrimacula Barnes & McDunnough, Hydroeciodes, [Gortyna] | 933208 | |
9012.1 | ochrocraspis Hampson, Cobubatha | 931273 | |
10801 | ochrogaster Guenée, Euxoa, [Noctua] | 933424 | |
| ochroleuca Strand, Haploa | 930345 | |
| ochronota Hampson, Peridroma, [Lycophotia] | 933211 | |
| ochropenta Bird, Papaipema, misspelled | 932477 | |
| Ochropleura Hübner | 933528 | |
| ochroptena Dyar, Papaipema, [Gortyna] | 932477 | |
| ochroptena of authors, Papaipema, not Dyar, 1908 | 932495 | |
| ochroptenoides Bird, Papaipema, form, nomen nudum | 932495 | |
| ochroscapus Grote & Robinson, Ctenucha, form | 930437 | |
| octo Guenée, Amyna, [Perigea] | 931253 | |
| octomaculalis Hübner, Alypia | 931979 | |
| octomaculata of authors, Alypia, not Fabricius, 1775 | 931979 | |
9314 | octomaculata Fabricius, Alypia, [Sesia] | 931979 | |
| octomaculata of authors, Alypia, not Fabricius, 1775 | 931980 | |
| octomaculata Fabricius, Alypia– ssp., [Sesia] | 931979 | |
8926 | octoscripta Grote, Syngrapha, [Plusia] | 931212 | |
| ocularia of authors, Hypercompe, not Fabricius, 1775 | 930323 | |
10620.1 | ocularis Lafontaine, Ferris & Walsh, Hypotrix | 933175 | |
11197 | oculata Smith, Schinia | 932170 | |
8391 | oculatalis Möschler, Carteris, [Zanclognatha] | 930544 | |
| oculatissima Smith, Hypercompe, [Phalaena] | 930323 | |
8957 | oculatrix Guenée, Paectes, [Ingura] | 931106 | |
| Odontosia Hübner | 930012 | |
| odora Linnaeus, Ascalapha, [Phalaena], misspelled | 930759 | |
8649 | odorata Linnaeus, Ascalapha, [Phalaena] | 930759 | |
| oecogenes Dyar, Bellura, [Sphida] | 932518 | |
| Oedemasia Packard | 930096 | |
| Ogdoconta Butler | 932017 | |
| ogilviana Lafontaine, Xestia– ssp. | 933605 | |
10935.2 | ogilviensis Lafontaine, Parabarrovia | 933623 | |
| oithona Strecker, Grammia, [Arctia] | 930242 | |
| okakensis Packard, Xestia– ssp., [Agrotis] | 933604 | |
10939 | okakensis Packard, Xestia, [Agrotis] | 933604 | |
11148 | oleagina Morrison, Schinia | 932094 | |
9572 | olga Smith, Andropolia | 932683 | |
9860 | olgae Sala, Annaphila | 931745 | |
| Oligia Hübner | 932374 | |
| Oligia | 932376 | |
| Oligocentria Herrich-Schäffer | 930104 | |
| olivacea Walker, Panula, [Alamis] | 930883 | |
11226 | olivacea Barnes & McDunnough, Grotella | 931713 | |
11130 | olivacea Smith, Schinia | 932068 | |
8892 | olivacea Skinner, Autoplusia, [Autographa] | 931173 | |
| olivacea Morrison, Lacinipolia– ssp., [Mamestra] | 933053 | |
9287 | olivacea Smith, Cryphia, [Cerma] | 932195 | |
| olivacea Grote, Hypena | 930584 | |
| olivacea Grossbeck, Tripudia, [Cobubatha] | 931270 | |
10406 | olivacea Morrison, Lacinipolia, [Mamestra] | 933053 | |
10833 | olivalis Grote, Euxoa, [Agrotis] | 933442 | |
9757 | olivalis Barnes & McDunnough, Lineostriastiria, [Stiria] | 931668 | |
| olivata Packard, Heterocampa, [Lochmaeus] | 930087 | |
9953 | olivata Harvey, Mesogona, [Glaea] | 932610 | |
10741 | olivia Morrison, Euxoa, [Agrotis] | 933318 | |
| olivia Edwards, Catocala | 930848 | |
| olivia Barnes & McDunnough, Fotella | 932034 | |
| olivioides Barnes & Benjamin, Fotella | 932034 | |
| olorina Grote, Andropolia– ssp., [Hadena] | 932682 | |
9569 | olorina Grote, Andropolia, [Hadena] | 932682 | |
8166.3 | olschwangi Dubatolov, Arctia | 930293 | |
9742 | olvello Barnes, Plagiomimicus, [Stibadium] | 931647 | |
| olympia Butler, Composia, [Phaloesia] | 930349 | |
| olympia of authors, Composia, not Butler, 1871 | 930349 | |
| olympia Crabo, Apamea– ssp. | 932316 | |
| oma Dyar, Phytometra, [Antarchaea] | 930719 | |
| omega Hübner, Argyrogramma | 931166 | |
| omega Esper, Graphiphora, [Phalaena] | 933563 | |
| omicron Hübner, Argyrogramma, [Autographa] | 931166 | |
10935.1 | omilaki Lafontaine, Parabarrovia | 933622 | |
10199 | omissa Dod, Cucullia | 931507 | |
| Ommatochila Butler | 930724 | |
| Ommatostola Grote | 932293 | |
| Ommatostolidea Benjamin | 931492 | |
| Omoiala Grote | 930351 | |
| Omoptera Guérin-Méneville | 931015 | |
| Omopterini Boisduval | 930968 | |
| Omopterus Guérin-Méneville, misspelled | 931015 | |
| omphale of authors, Cosmosoma, not Hübner, 1806 | 930458 | |
| ona Smith, Apamea– ssp., [Luperina] | 932339 | |
9126 | onagrus Guenée, Spragueia, [Agrophila] | 931386 | |
| onagrus of authors, Spragueia, not Guenée, 1852 | 931387 | |
| Oncocnemidinae Forbes & Franclemont | 931764 | |
| Oncocnemis Lederer | 931786 | |
10748 | oncocnemoides Barnes & Benjamin, Euxoa, [Agrotis] | 933363 | |
8409 | ondo Barnes, Oxycilla, [Erastria] | 930599 | |
10953 | ononensis Bremer, Pseudohermonassa, [Agrotis] | 933632 | |
| ononidis Guenée, Heliothis, misspelled | 932049 | |
| ononis [Denis & Schiffermüller], Heliothis, nomen nudum | 932049 | |
11077 | ononis Fabricius, Heliothis, [Noctua] | 932049 | |
| ontakensis Sugi, Apamea | 932353 | |
| ontario Smith, Euxoa– ssp., [Carneades] | 933405 | |
9452 | onusta Grote, Macronoctua | 932442 | |
| Onychagrotis Hampson | 933505 | |
| onychina Guenée, Egira, [Epunda] | 932799 | |
| oo Stoll, Chrysodeixis, [Phalaena] | 931170 | |
| ooana Strand, Chrysodeixis | 931170 | |
| opaca Barnes & Benjamin, Gluphisia | 930019 | |
| opaca Harvey, Dichagyris, [Agrotis] | 933232 | |
| opaca Chermock & Chermock, Eupsilia, form | 932591 | |
| opacalis Grote, Hypenula | 930527 | |
10988 | opacifrons Grote, Coenophila, [Agrotis] | 933624 | |
8487 | opada Franclemont, Nychioptera | 930723 | |
| opalisans of authors, Leucania, not Draudt, 1924 | 932956 | |
8118 | opella Grote, Virbia, [Crocota] | 930297 | |
| opelloides Graef, Virbia, [Crocota] | 930295 | |
| Opharus Walker | 930384 | |
8854 | ophelia Edwards, Catocala | 930840 | |
| Ophideres Boisduval | 930623 | |
| Ophiderini Guenée | 930623 | |
| Ophioderes Agassiz, emendation | 930623 | |
9385.1 | ophiogramma Esper, Lateroligia, [Phalaena] | 932363 | |
| ophir Barnes & McDunnough, Grammia, [Apantesis] | 930264 | |
| Ophisma Guenée | 930968 | |
| Ophiuche Hübner | 930560 | |
8970 | ophthalmica Guenée, Baileya, [Leptina] | 931149 | |
8645 | opigena Drury, Hemeroblemma, [Phalaena] | 930755 | |
9981 | opina Grote, Dryotype, [Dryobota] | 932702 | |
| opipara Edwards, Cobubatha, gender-conform, form | 931277 | |
| opipara Morrison, Euxoa, [Agrotis] | 933326 | |
| opiparus Edwards, Cobubatha, [Oribates], form | 931277 | |
8555.1 | opistographa Guenée, Itomia | 930978 | |
10042.3 | opleri Troubridge, Sympistis | 931941 | |
10691.1 | opleri Lafontaine, Copablepharon | 933285 | |
| opposita Barnes & Benjamin, Datana– ssp. | 930039 | |
| Opsigalea Hampson | 931541 | |
10026 | opter Dyar, Pleromella | 931559 | |
10604 | optima Dyar, Hypotrix, [Scriptania] | 933180 | |
8166.1 | opulenta Edwards, Arctia, [Euprepia] | 930291 | |
| orae Barnes & Benjamin, Cosmia, [Namangana] | 932670 | |
| orba Smith, Tarache, [Conacontia] | 931366 | |
| orba Grote, Ommatochila, [Thalpochares] | 930725 | |
8856 | orba Kusnezov, Catocala | 930843 | |
| orbica Morrison, Amyna, [Segetia] | 931253 | |
10040 | orbicularis Barnes & McDunnough, Sympistis, [Oxycnemis] | 931925 | |
| orbicularis Strand, Papaipema | 932506 | |
| orbicularis Smith, Euxoa, [Agrotis] | 933482 | |
| orbicularis Walker, Spodoptera, [Laphygma] | 932224 | |
10574 | orbiculata Smith, Ulolonche, [Mamestra] | 933125 | |
| orbiculata Smith, Orthosia, [Stretchia], form | 932763 | |
9637 | orbifera Walker, Magusa, [Xylina] | 932281 | |
| orbiferana Strand, Magusa | 932281 | |
| orbiferella Strand, Magusa, form | 932281 | |
| orbipuncta Barnes & McDunnough, Dichagyris, [Rhynchagrotis] | 933244 | |
11027 | orbis Grote, Abagrotis, [Agrotis] | 933676 | |
| orbitis Strand, Abagrotis | 933676 | |
| orca Crabo & Hammond, Xestia– ssp. | 933606 | |
8360 | orciferalis Walker, Macrochilo, [Hormisa] | 930511 | |
| ordinans Walker, Isogona, [Poaphila] | 930739 | |
| ordinaria Walker, Apamea, [Mamestra] | 932350 | |
9561.1 | ordinarius Butler, Dypterygia, [Prometopus] | 932275 | |
| ordinata Walker, Euxoa, [Agrotis] | 933319 | |
10441.1 | oregona Smith, Leucania | 932940 | |
| oregonensis Harvey, Lithophane– ssp. | 932573 | |
7916 | oregonensis Butler, Nadata | 930047 | |
8231 | oregonensis Stretch, Cycnia, [Euchaetes] | 930405 | |
| oregonensis Stretch, Cycnia– ssp., [Euchaetes] | 930405 | |
| oregonica McDunnough, Anarta– ssp., [Scotogramma] | 932831 | |
11078 | oregonica Edwards, Heliothis, [Melicleptria] | 932050 | |
10228 | oregonica Grote, Anarta, [Mamestra] | 932831 | |
| oregonicus Edwards, Heliothis, gender-conform | 932050 | |
8484 | orgiae Grote, Phytometra, [Prothymia] | 930720 | |
| Orgyia Ochsenheimer | 930159 | |
| Orgyiini Wallengren | 930141 | |
| Oria Guenée, preoccupied | 932061 | |
10203 | oribac Barnes, Cucullia | 931512 | |
10248 | orida Smith, Scotogramma, [Mamestra] | 932857 | |
| orientalis Moore, Arctia | 930290 | |
| orientalis Grote, Hypocoena, [Tapinostola] | 932426 | |
| orilliana Grote, Cerastis, [Pachnobia] | 933542 | |
| orina Guenée, Elaphria, [Cosmia] | 932238 | |
| orinella Strand, Cosmia, form | 932672 | |
| orinula Strand, Cosmia, form | 932672 | |
| orion McDunnough, Catocala | 930807 | |
9894 | oriunda Grote, Lithophane | 932541 | |
8177 | ornata Packard, Grammia, [Callarctia] | 930271 | |
| ornata Neumögen, Acherdoa, [Varina] | 932213 | |
| ornata Ottolengui, Chalcopasta, [Deva] | 931696 | |
| ornata Smith, Abagrotis, gender-conform | 933650 | |
| ornata Grote & Robinson, Clostera– ssp., [Ichthyura] | 930009 | |
8105 | ornatrix Linnaeus, Utetheisa, [Phalaena] | 930348 | |
| ornatus Smith, Abagrotis | 933650 | |
8396 | orneodalis Guenée, Lascoria, [Tortricodes] | 930550 | |
9669 | ornithogalli Guenée, Spodoptera, [Prodenia] | 932219 | |
10565 | orobia Harvey, Protorthodes, [Mamestra] | 933114 | |
| Orodemnias Wallengren | 930239 | |
| Orodesma Herrich-Schäffer | 930916 | |
| Orodesmia Wolcott, misspelled | 930916 | |
8930 | orophila Hampson, Syngrapha, [Plusia] | 931221 | |
| Orosagrotis Hampson | 933306 | |
| orphnina Dyar, Photedes, [Arenostola] | 932424 | |
9697 | orta Barnes & McDunnough, Condica, [Perigea] | 931996 | |
| Orthoa Billberg | 932761 | |
| Orthoclostera Butler | 931105 | |
| Orthodea Smith, misspelled | 933135 | |
| Orthodes Guenée | 933135 | |
| Orthodes | 933139 | |
10645 | orthogonia Morrison, Agrotis | 933512 | |
| orthogonoides McDunnough, Agrotis | 933512 | |
| Orthogramma Guenée, preoccupied | 931080 | |
| Orthomoia Mustelin | 932417 | |
| Orthosia | 932781 | |
| Orthosia Ochsenheimer | 932761 | |
| Orthosiini Guenée | 932749 | |
| orthosiodes Richards, Phoberia, misspelled | 930862 | |
| orthosioides Guenée, Phoberia, [Lyssia] | 930862 | |
9017 | orthozona Hampson, Cobubatha, [Eustrotia] | 931276 | |
| ortonii Packard, Peridroma, [Agrotis] | 933211 | |
| ortruda Smith, Anarta– ssp., [Mamestra] | 932836 | |
| Oruza | 930697 | |
| Orvasca Walker | 930170 | |
| osculata Hulst, Catocala | 930792 | |
| osiris Barnes & Benjamin, Euparthenos– ssp. | 931055 | |
10082.4 | osiris Troubridge, Sympistis | 931840 | |
| oslari Barnes, Orgyia– ssp. | 930168 | |
| oslari Rothschild, Halysidota, [Halisidota] | 930360 | |
| oslari Rothschild, Pygarctia | 930423 | |
8148 | oslari Rothschild, Hypercompe, [Ecpantheria] | 930326 | |
7962 | oslari Dyar, Afilia | 930055 | |
| Oslaria Dyar | 931574 | |
8116 | ostenta Edwards, Virbia, [Crocota] | 930296 | |
9421.1 | osticollis Troubridge, Euros | 932405 | |
| ota Barnes & Benjamin, Tricholita, [Chabuata] | 933194 | |
| otero Barnes, Kodiosoma | 930432 | |
9270 | othello Smith, Acronicta, [Acronycta] | 931484 | |
| otho Barnes, Leucanopsis, [Euhalisidota] | 930378 | |
| Othreis Hübner | 930623 | |
| Othryis Agassiz, emendation | 930623 | |
8390.1 | otignatha Hampson, Aglaonice | 930743 | |
| otiosa Walker, Condica, [Perigea] | 931998 | |
| otiosa Neumögen & Dyar, Grammia, [Euprepia] | 930247 | |
| Otosema Hübner | 930758 | |
8922 | ottolenguii Dyar, Syngrapha, [Autographa] | 931211 | |
8895 | ou Guenée, Rachiplusia, [Plusia] | 931176 | |
| ouana Strand, Rachiplusia | 931176 | |
| ouella Strand, Rachiplusia | 931176 | |
9173 | oula Dyar, Bagisara | 931245 | |
| ouwah Poling, Catocala | 930857 | |
8753 | ovalis Grote, Ptichodis, [Phurys] | 930936 | |
8880 | ovalis Guenée, Abrostola | 931161 | |
9243 | ovata Grote, Acronicta, [Acronycta] | 931463 | |
10563 | oviduca Guenée, Protorthodes, [Taeniocampa] | 933113 | |
8995 | ovilla Grote, Nola | 931135 | |
| ovomaculata Schnaider, Orgyia | 930160 | |
| Oxycilla Grote | 930594 | |
| Oxycnemis Grote | 931610 | |
| oxygala Grote, Mythimna– ssp., [Heliophila] | 932933 | |
10436 | oxygala Grote, Mythimna, [Heliophila] | 932933 | |
8889 | oxygramma Geyer, Ctenoplusia, [Autographa] | 931169 | |
| Oxylos Grote | 932061 | |
10269 | oxymorus Grote, Admetovis | 932806 | |
| Ozarba Walker | 931301 | |
| oziphona Dyar, Properigea, [Bryomima] | 932718 | |
| Ozodania Dyar | 930175 | |