| O RLY? | O Virgin Pure | O! R U L8, 2? |
| O&O Defrag | O'Che 1867 | O'Che1867 |
| O'Hare International Airport | O'Reilly | O'Reilly Media |
| O'ver | O'Z-Y型电力机车 | O'zbekiston型电力机车 |
| O'zbekiston型電力機車 | O(1)排程器 | O-1超重型坦克 |
| O-2 Skymaster | O-2偵察機 | O-型小行星 |
| O-乙基-S-(2-二异丙氨基乙基)甲基硫代膦酸酯 | O-Bahn | O-Bahn巴士專線 |
| O-Bahn公交车道 | O-I超重型坦克 | O-Zone |
| O. J. Simpson | O.C. | O.co 競技場 |
| O.J. Simpson | O.J.辛普森 | O.R.I.O.N. |
| O104 | O104:H4 | O104:H4型大腸桿菌 |
| O104:H4大腸桿菌 | O157 | O2 |
| O2 (英國) | O2 Joggler | O2布里克斯頓學院 |
| O2勁樂團 | O2體育館 | O2jam |
| O2Jam | O2Jam Analog | O2Jam U |
| O2O | O2o | O2U海盜式偵察機 |
| O3 | O3b网络 | O8 |
| Oacoma, South Dakota | OAD | OAH-66 |
| Oahu | Oak | Oak Creek, Colorado |
| Oak Grove, Alabama | Oak Grove, Louisiana | Oak Hill, Alabama |
| Oak Hill, Florida | Oak Park, Illinois | Oak Ridge, Louisiana |
| Oak Ridges, Ontario | Oakdale, California | Oakdale, Louisiana |
| Oakes, North Dakota | Oakland International Airport | Oakland Park, Florida |
| Oakland Public Library | Oakland Schools | Oakland Unified School District |
| Oakland USD | Oakland, Florida | Oakman, Alabama |
| Oakwood University | OAM | Oancea |
| OASDI | Oasis | OASIS |
| OASIS (夏之管专辑) | OASIS (組織) | Oasis montaj |
| Oasishongkong | Oath | Oath Inc. |
| Oath sign | Oath公司 | Oats |
| Oats Studio | OAuth | O型 |
| O型主序星 | O型環 | O型血 |
| O型蒸汽机车 | O型腿 | O型雜弦 |
| O型恒星 | O型恆星 | O型次矮星 |
| O型星 | O·J·辛普森 | O·J·辛普森謀殺案 |
| O·J·辛普森案件 | O·J·梅奥 | O·R·坦博国际机场 |
| O形圈 | O形環 | O係人種 |
| O・J・辛普森案件 | O囧0 | O囧O |
| OB | Ob | OB 星 |
| Obafemi Martins | Obama | Obamacare |
| Obania | OB企劃 | OBD |
| Obdach | OBE | Ober-Grafendorf |
| Oberaich | Oberalm | Oberdorf am Hochegg |
| Oberdorf im Burgenland | Oberdrauburg | Oberhaag |
| Oberhofen am Irrsee | Oberhofen im Inntal | Oberkappel |
| Oberkurzheim | Oberlienz | Oberlin, Louisiana |
| Oberloisdorf | Obernberg am Brenner | Obernberg am Inn |
| Oberndorf an der Melk | Oberndorf bei Schwanenstadt | Oberndorf in Tirol |
| Oberneukirchen | Oberon | Oberon, North Dakota |
| Oberonia | Oberonia acaulis | Oberonia anthropophora |
| Oberonia arisanensis | Oberonia austroyunnanensis | Oberonia cathayana |
| Oberonia caulescens | Oberonia delicata | Oberonia ensiformis |
| Oberonia falconeri | Oberonia gammiei | Oberonia gigantea |
| Oberonia insularis | Oberonia integerrima | Oberonia iridifolia |
| Oberonia japonica | Oberonia jenkinsiana | Oberonia kwangsiensis |
| Oberonia latipetala | Oberonia longibracteata | Oberonia mannii |
| Oberonia menghaiensis | Oberonia menglaensis | Oberonia myosurus |
| Oberonia obcordata | Oberonia pachyrachis | Oberonia pumila |
| Oberonia pyrulifera | Oberonia rosea | Oberonia rufilabris |
| Oberonia seidenfadenii | Oberonia variabilis | Oberperfuss |
| Oberpullendorf | Oberrettenbach | Oberschützen |
| Oberschlierbach | Obersiebenbrunn | Oberstorcha |
| Obertilliach | Obertraun | Obertrum am See |
| Obervellach | Obervogau | Oberwaltersdorf |
| Oberwang | Oberwölz | Oberwölz Umgebung |
| Oberweg | Oberzeiring | Obesity |
| Obesity hypoventilation syndrome | OBEX | OBI |
| Obi wan | Obi wan kenobi | Obi-Wan |
| Obi-Wan Kenobi | OBike (臺灣) | Obinautilus |
| Obj C | Obj-C | ObjC |
| Object Desktop | Object element | Object Management Group |
| Object Pascal | Object Windows Library | Object-oriented design |
| Object-Oriented Programming | Objective C | Objective Caml |
| Objective-C | Objective-C 2.0 | Objective-C++ |
| Oblada melanura | Oblast | Oblivion |
| Oblivious | OBM | Obo |
| Oboro Bishamon | Obov | OBP |
| Obregonia denegrii | Obritzberg-Rust | OBROJECT |
| OBS | Obscenity | Observatorio Astronómico de La Sagra |
| Observium | OBSESSION | Obsidian Entertainment |
| Obsteig | Obstructive sleep apnea | OBU |
| Obviously | OB星 | OB星协 |
| OB星協 | OC | OC (第三季) |
| OC (第一季) | OC (第二季) | OC-135B侦察机 |
| OC-ute | OCA | Ocadia glyphistoma |
| Ocadia philippeni | Ocala, Florida | OCaml |
| Ocara | Ocarina | Ocauçu |
| OCBC | OCC | Occam |
| Occam (程式語言) | Occella dodecaedron | Occella iburia |
| Occella kasawae | Occella kuronumai | OCCI |
| Occidental College | Occidentarius platypogon | Occidozyga borealis |
| Occidozyga lima | Occipital bone | OCCT |
| Occult | Occultic;Nine | Occupied Poland |
| OCD | OCEAN | Ocean |
| OCEAN (东方神起单曲) | OCEAN (B'z單曲) | Ocean Breeze Park, Florida |
| Ocean One | Ocean Park | Ocean park |
| Ocean Ridge, Florida | Ocean View, Delaware | Ocean's Eight |
| Ocean's Eleven | Ocean's Eleven (2001 film) | Ocean's Thirteen |
| Ocean's Twelve | Oceanborn | Oceania |
| Oceanic crust | Oceanites oceanicus | Oceanodroma leucorhoa |
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