| Oroso | Orostachys | Orostachys aggregata |
| Orostachys cartilaginea | Orostachys chanetii | Orostachys fimbriata |
| Orostachys iwarenge | Orostachys japonica | Orostachys malacophylla |
| Orostachys malacophylla malacophylla | Orostachys minuta | Orostachys paradoxa |
| Orostachys sikokiana | Orostachys spinosa | Orostachys thyrsiflora |
| Oroszi | Oroszlány | Oroszló |
| Orosztony | Orotelli | Orotermes |
| Orotermes monstrosa | Orothalassodes | Orothalassodes falsaria |
| Orotina (tổng) | Orotylus mitis | Oroussetia distincta |
| Oroussetia hirta | Oroussetia philippinensis | Oroussetia pubescens |
| Oroussetia punctata | Oroux | Oroxenofrea spiculata |
| Oroxylum indicum | Oroya baumannii | Oroya borchersii |
| Oroya peruviana | Oroz-Betelu | ORP Ślązak (L26) |
| ORP Generał Kazimierz Pułaski | ORP Krakowiak (L115) | ORP Kujawiak (L72) |
| ORP Orkan | ORP Orkan (G90) | ORP Piorun (G65) |
| Orp-Jauche | Orphan (phim) | Orphana inquirenda |
| Orphana wagenknechti | Orphanodendron | Orphanodendron bernalii |
| Orphanodendron bernatii | Orphanostigma | Orphanostigma abruptalis |
| Orphanostigma excisa | Orphanostigma vibiusalis | Orphe |
| Orphelana perplexa | Orpheum theater (Los Angeles) | Orpheus |
| Orpheus in the Underworld | Orpheus và Euridice | Orphilinae |
| Orphilodes australis | Orphilodes malleecola | Orphilodes minor |
| Orphilus | Orphilus africanus | Orphilus ater |
| Orphilus beali | Orphilus dubius | Orphilus niger |
| Orphilus subnitidus | Orphin | Orphinus aethiops |
| Orphinus affinis | Orphinus africanus | Orphinus apicalis |
| Orphinus apicebrunneus | Orphinus atrofasciatus | Orphinus atrous |
| Orphinus australicus | Orphinus bicolor | Orphinus biflexus |
| Orphinus binotatus | Orphinus bipunctutus | Orphinus biroi |
| Orphinus casuarinae | Orphinus ceciliense | Orphinus chinensis |
| Orphinus congoanus | Orphinus conjunctus | Orphinus convexus |
| Orphinus defectus | Orphinus demeyeri | Orphinus diversus |
| Orphinus fasciatus | Orphinus fouqueti | Orphinus fulvipes |
| Orphinus funestus | Orphinus globulicornis | Orphinus guernei |
| Orphinus haemorrhoidalis | Orphinus hartmanni | Orphinus horni |
| Orphinus incognitus | Orphinus infasciatus | Orphinus interioris |
| Orphinus japonicus | Orphinus jiri | Orphinus jucundus |
| Orphinus kabateki | Orphinus katerina | Orphinus kejvali |
| Orphinus kenyensis | Orphinus kresli | Orphinus malabarensis |
| Orphinus mediojunctus | Orphinus minimus | Orphinus minor |
| Orphinus mroczkowskii | Orphinus nealense | Orphinus nesioticus |
| Orphinus nilgirensis | Orphinus notaticollis | Orphinus obliteratus |
| Orphinus occidentalis | Orphinus okinawanus | Orphinus orientalis |
| Orphinus oscitans | Orphinus ovalis | Orphinus pedestris |
| Orphinus pseudoovalis | Orphinus quadrimaculatus | Orphinus quornensis |
| Orphinus rufofasciatus | Orphinus rusumoensis | Orphinus sexmaculatus |
| Orphinus sikkimensis | Orphinus subfasciatus | Orphinus tabitha |
| Orphinus tadzhicus | Orphinus terminalis | Orphinus testaceipes |
| Orphinus tonkineus | Orphinus unifasciatus | Orphinus wagneri |
| Orphinus woodvillensis | Orphinus yunnanus | Orphinus zomba |
| Orphium frutescens | Orphnaecus | Orphnaecus pellitus |
| Orphnodula argyrosterna | Orphnophanes | Orphnophanes ankarampotsyalis |
| Orphnophanes ankarapotsyalis | Orphnophanes eucerusalis | Orphnophanes laevalis |
| Orphnophanes thoasalis | Orphnophanes turbatalis | Orpierre |
| Orpierre (tổng) | Orquevaux | Orr, Minnesota |
| Orrea | Orret | Orrhodia |
| Orrhodiella | Orrhodops americanus | Orrhodops occidentalis |
| Orrhynchites comosellus | Orria | Orrick, Quận Ray, Missouri |
| Orrios | Orriule | Orrmaesia |
| Orrmaesia dorsicosta | Orrmaesia nucella | Orroli |
| Orrorin | Orrorin tugenensis | Orrouer |
| Orrouy | Orrstown, Pennsylvania | Orrville, Alabama |
| Orrville, Ohio | Orry-la-Ville | Ors |
| Orsa (đô thị) | Orsa (bướm đêm) | Orsa bilineatus |
| Orsa deleta | Orsa erythrospila | Orsa orbifera |
| Orsa rufitibia | Orsago | Orsan |
| Orsanco | Orsans, Aude | Orsans, Doubs |
| Orsara Bormida | Orsara di Puglia | Orsay |
| Orschwihr | Orschwiller | Orsenigo |
| Orsennes | Orses | Orsfeld |
| Orshansky (huyện) | Orsidis acutipennis | Orsidis andamanensis |
| Orsidis flavosticticus | Orsidis privatus | Orsidis proletarius |
| Orsidis singaporensis | Orsima | Orsima constricta |
| Orsima ichneumon | Orsinome | Orsinome armata |
| Orsinome cavernicola | Orsinome daiqin | Orsinome diporusa |
| Orsinome elberti | Orsinome jiarui | Orsinome lagenifera |
| Orsinome listeri | Orsinome lorentzi | Orsinome marmorea |
| Orsinome monulfi | Orsinome phrygiana | Orsinome pilatrix |
| Orsinome sarasini | Orsinome trappensis | Orsinome vethi |
| Orsinome vorkampiana | Orsinval | ORSIS T-5000 |
| Orsk | Orsocoma macrogona | Orsodacne |
| Orsodacninae | Orsolobidae | Orsolobus |
| Orsolobus chelifer | Orsolobus chilensis | Orsolobus mapocho |
| Orsolobus montt | Orsolobus plenus | Orsolobus pucara |
| Orsolobus pucatrihue | Orsolobus schlingeri | Orsolobus singularis |
| Orson Welles | Orsonnette | Orsonoba |
| Orsonville | Orsonwelles | Orsonwelles ambersonorum |
| Orsonwelles arcanus | Orsonwelles bellum | Orsonwelles calx |
| Orsonwelles falstaffius | Orsonwelles graphicus | Orsonwelles iudicium |
| Orsonwelles macbeth | Orsonwelles malus | Orsonwelles othello |
| Orsonwelles polites | Orsonwelles torosus | Orsonwelles ventus |
| Orsova | Orstom | Orstom aoupinie |
| Orstom chazeaui | Orstom hydratemei | Orstom macmillani |
| Orstom tropicus | Orstom undecimatus | Orstomaleyrodes fimbriae |
| Ort im Innkreis | Orta Bostancı, Suruç | Orta di Atella |
| Orta Fatmacık, Birecik | Orta Nova | Orta, Çankırı |
| Orta, Taşköprü | Orta, Vezirköprü | Ortaağaç, Ergani |
| Ortaalan, Akçaabat | Ortaalan, Ardeşen | Ortaşar, Çınar |
| Ortaç, Lice | Ortaç, Yüksekova | Ortaçakmak, Yıldızeli |
| Ortaçalı, Elâzığ | Ortaçanak, Bingöl | Ortaçat, Çayırlı |
