| Oppol | Opponitz | Opportuna dari Montreuil |
| Opportunity | Opportunity (robot ruang angkasa) | Opportunity cost |
| Opposite Day | Opposite Day (episode SpongeBob SquarePants) | Opposite Day (Episode SpongeBob SquarePants) |
| Opposite Day (SpongeBob SquarePants episode) | Opposite Day (SpongeBob SquarePants Episode) | Opposite Day (SpongeBob SquarePants) |
| Opposite Sex (seri televisi) | Opposite Sex (seri TV) | Opposite sex (serial tv) |
| Opposite Sex (serial TV) | Opposites A-Frack | Oppung |
| Oppy | Oppy, Pas-de-Calais | Oppy, pas-de-calais |
| OPR-1000 | Opr-1000 | Oprah |
| Oprah Gail Winfrey | Oprah vs. Ellen | Oprah Winfrey |
| Oprah winfrey | Oprah Winfrey Show | Oprah's Book Club |
| Oprah's book club | Oprator pelabuhan | Oprichnina |
| OPS 5111 | Ops 5111 | OPS 5112 |
| Ops 5112 | OPS 5113 | Ops 5113 |
| OPS 5114 | Ops 5114 | OPS 5117 |
| Ops 5117 | OPS 5118 | Ops 5118 |
| OPS 9794 | Ops 9794 | OPS! |
| Opsamates | Opsamates angustatus | Opsamates dimidiatus |
| Opsamates flabellicornis | Opsamates flavoapicalis | Opsamates fuscipennis |
| Opsamates fuscoapicalis | Opsamates grandis | Opsamates obscurus |
| Opsamates pauliani | Opsamates piceonitens | Opsamates pustulosus |
| Opsamates spinipennis | Opsaridium loveridgii | Opsaroa fulvinota |
| Opseostlengis insignis | Opsi (keuangan) | Opsi saham |
| Opsi Samson | Opsi Simson | Opsibidion |
| Opsibidion albifasciatum | Opsibidion albinum | Opsibidion flavocinctum |
| Opsidota | Opsidota aestuosa | Opsidota albipilosa |
| Opsidota gracilis | Opsidota guttata | Opsidota infecta |
| Opsidota sculpticollis | Opsies | Opsies capra |
| Opsikion | Opsilia | Opsilia aspericollis |
| Opsilia badenkoi | Opsilia bucharica | Opsilia chinensis |
| Opsilia irakensis | Opsilia malachitica | Opsilia molybdaena |
| Opsilia prasina | Opsilia schurmanni | Opsilia tenuilinea |
| Opsilia transcaspica | Opsilia uncinata | Opsilia varentzovi |
| Opsimus | Opsimus quadrilineatus | Opsin |
| Opsion | Opsion autumnalis | Opsion bicolorata |
| Opsion collaris | Opsion concolor | Opsion costata |
| Opsion cryptocauda | Opsion curvisetosa | Opsion demeijerei |
| Opsion euloma | Opsion flavipuncta | Opsion fumipes |
| Opsion fuscipalpis | Opsion hamata | Opsion humerella |
| Opsion intestata | Opsion javanica | Opsion johannseni |
| Opsion laxa | Opsion longicornis | Opsion longisetosa |
| Opsion membrancea | Opsion nigra | Opsion ornatifemora |
| Opsion ornatithorax | Opsion palaguensis | Opsion pappi |
| Opsion pilosa | Opsion pughi | Opsion regni |
| Opsion sinica | Opsion tenuis | Opsion thaya |
| Opsion usambarensis | Opsir Udara II | Opsir Udara III |
| Opsterland | OPT | Opta Sports |
| Optatam Totius | Optatam totius | Optatissimus |
| Opteron | Optevoz | Optibor |
| Optical character recognition | Optical Character Recognition (blok Unicode) | Optical character recognition (blok unicode) |
| Optical coherence tomography | Optical disc | Optical time-domain reflectometer |
| Optical Time-Domain Reflectometer | Optik | Optik adaptif |
| Optik fiber | Optik kuantum | Optik Melawai |
| Optik melawai | Optika | Optika fisis |
| Optika Fourier | Optika fourier | Optika geometris |
| Optika klasik | Optika sinar-X | Optika sinar-x |
| Optile | Optima | Optimal |
| Optimal Tax | Optimasi | Optimasi facebook |
| Optimisasi | Optimisasi (matematika) | Optimisasi mesin pencari |
| Optimisasi multiatribut | Optimisasi multikriteria | Optimisasi multiobjektif |
| Optimisasi Pareto | Optimisasi perangkat lunak | Optimisasi vektor |
| Optimisme | Optimistic Tragedy | Optimisticheskaya tragediya |
| Optimus Prime | Optimus prime | OPTIONS (HTTP) |
| Optisian | Optoelektronik | Optoelektronika |
| Optomerus | Optomerus bispeculifer | Optomerus roppai |
| Optomerus rufotibialis | Optometri | Optronik |
| Optus | Optus Television | Optus television |
| Opu Daeng Risadju | Opudi | Opung |
| Opuntia | Opuri, Biak Barat, Biak Numfor | Opuri, biak barat, biak numfor |
| Opus (format audio) | Opus caementicium | Opus Colors |
| Opus Dei | Opus dei | Opus sectile |
| Opus signinum | Opus tessellatum | Opus TV |
| Opus vermiculatum | Opus, Yunani | OPUSAT |
| Opusat | Oqil Oqilov | Oqil oqilov |
| Oqros biliki | Oquirrh Park Oval | Oquirrh Park Speed Skating Arena |
| Oquirrh Park Speed Skating Indoor Arena | Oquirrh Park Speed Skating Oval | OQYANA |
| Oqyana | OR | Or Akiva |
| Or akiva | OR Insight | Or insight |
| OR Tambo Airport | Or Yehuda | Or yehuda |
| Ora | Ora (album) | ORA (album) |
| Ora Carew | Ora Et Labora | Ora et labora |
| Ora Et Labora (lagu) | Ora Et Labora (Lagu) | Ora et labora (lagu) |
| Ora Keturutan | Ora keturutan | Ora Namir |
| Ora, Putri Ur | Oraa Guzula Dado | Oraa Guzura Dado |
| Oraàs | Orašje | Oracle |
| Oracle (disambiguasi) | Oracle Corporation | Oracle corporation |
| Oracle Database | Oracle Delphi | Oracle Park |
| Oracle Solaris | Oracle solaris | Oracle Thinkquest |
| Oracle thinkquest | Oradea | Oradour, Cantal |
| Oradour, Charente | Oradour-Fanais | Oradour-Saint-Genest |
| Oradour-saint-genest | Oradour-sur-Glane | Oradour-sur-glane |
| Oradour-sur-Glane (commune) | Oradour-sur-Vayres | Oradour-sur-vayres |
| Orahili | Orahili (disambiguasi) | Orahili Badalu, Mandrehe Barat, Nias Barat |
| Orahili badalu, mandrehe barat, nias barat | Orahili Balaekha, Lahusa, Nias Selatan | Orahili Bo'e, Susua, Nias Selatan |
| Orahili Eho, Amandraya, Nias Selatan | Orahili eho, amandraya, nias selatan | Orahili Faomasi, Luahagundre Maniamolo, Nias Selatan |
| Orahili Fau, Fanayama, Nias Selatan | Orahili fau, teluk dalam, nias selatan | Orahili Fau, Teluk Dalam, Nias Selatan |
| Orahili Fondrako, Ulususua, Nias Selatan | Orahili Gomo, Gomo, Nias Selatan | Orahili gomo, gomo, nias selatan |
| Orahili Huruna, Onohazumba, Nias Selatan | Orahili Idanoi, Hiliserangkai, Nias | Orahili idanoi, lolofitu moi, nias barat |
| Orahili Idanoi, Lolofitu Moi, Nias Barat | Orahili Mola, Umbunasi, Nias Selatan | Orahili Sibohou, Gomo, Nias Selatan |
| Orahili somolomolo, ulugawo, nias | Orahili Somolomolo, Ulugawo, Nias | Orahili susua, gomo, nias selatan |
| Orahili Susua, Gomo, Nias Selatan | Orahili Susua, Susua, Nias Selatan | Orahili Tanose'o, Gunungsitoli Alo'oa, Gunungsitoli |
