| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
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| Oberon to Oita |
| |
| Oberon |
| Oberth, Hermann Julius |
| obesity |
| Obil |
| object-oriented programming |
| oblast |
| obliquity of the ecliptic |
| oboe |
| Obote, Apollo Milton |
| Obrecht, Jacob |
| Obregón, Álvaro |
Obrenovi |
| Obrenovich |
| O’Brian, Patrick |
| O’Brien, Conor Cruise |
| O’Brien, Edna |
| O’Brien, Flann |
| O’Brien, William |
| O’Brien, William Smith |
| obscenity |
| observatory |
| observatory, orbiting |
| obsidian |
| obstetrics |
| Obuasi |
| Obuchi, Keizo |
| Obwalden |
| Ocala |
| ocarina |
| O’Casey, Sean |
| Occam, William of |
| occasionalism |
| Occitan |
| Occleve, Thomas |
| Occom, Samson |
| occultation |
| occultism |
| occupational disease |
| Occupational Safety and Health Administration |
| ocean |
| Ocean City |
| Oceania |
| Oceanic art |
| Oceanic languages |
| oceanids |
| Ocean Island |
| oceanography |
| ocean perch |
| Oceanside |
| Oceanus |
| ocellus |
| ocelot |
| Ochakov |
| ocher |
| Ochino, Bernardino |
| Ochoa, Severo |
| Ocho Rios |
| Ochrida |
| Ochs, Adolph S. |
| Ockeghem, Johannes |
| Ockham, William of |
| Ocmulgee |
| Ocmulgee National Monument |
| Oconee |
| O’Connell, Daniel |
| O’Connor, Feargus |
| O’Connor, Flannery |
| O’Connor, Frank |
| O’Connor, John Joseph |
| O’Connor, Rory |
| O’Connor, Sandra Day |
| O’Connor, Thomas Power |
| octahedron |
| octane number |
| octave |
| Octavia |
| Octavian |
| October |
| October Revolution |
| octopus |
| Oda Nobunaga |
| Odda |
| Oddsson, Davíð |
| ode |
| Oded |
| Odenathus, Septimius |
| Ödenburg |
| Odense |
| Odenwald |
| Oder |
| Oder-Neisse line |
| Odessa, city, Ukraine |
| Odessa, city, United States |
| Odets, Clifford |
| Odin |
| Odo |
| Odoacer |
| odometer |
| O’Donnell, Hugh Roe |
| O’Donnell, Leopoldo |
| O’Donojú, Juan |
| Odovacar |
| Odra |
| Odría, Manuel |
| Odum, Howard Washington |
| Odysseus |
| Odyssey |
| Oe, Kenzaburo |
| OECD |
| Oecolampadius, Johannes |
| Oedipus |
| Oedipus complex |
| Oehlenschläger, Adam Gottlob |
| Oeneus |
| Oenone |
| Oenothera |
| Oersted, Hans Christian |
| Oeta |
| O’Faoláin, Seán |
| Ofen, German name for Buda, Hungary |
| Ofen, Alpine pass, Switzerland |
| Offa |
| Offaly |
| Offa’s Dyke |
| Offenbach, Jacques Levy |
| Offenbach am Main |
| offertory |
| Office of Price Administration |
| Office of Strategic Services |
| Office of War Information |
| Offner, Richard |
| offset |
| Offutt Air Force Base |
| O’Flaherty, Liam |
| Og |
| Ogaden |
| Ogasawara-gunto |
| Ogata Kenzan |
| Ogata Korin |
| Ogbomosho |
| Ogden, city, United States |
| Ogden, river, United States |
| Ogdensburg |
| Ogé, Vincent |
| ogham |
| Ogier the Dane |
| Oglala Sioux |
| Oglesby, Richard James |
| Oglethorpe, James Edward |
| Ogoki |
| Ogooué |
| O’Gorman, Juan |
| Ogowe |
| OGPU |
| O’Grady, Standish |
| O’Grady, Standish Hayes |
| Ogyges |
| Ogygia |
| Oh, Sadaharu |
| Ohad |
| O’Hara, Frank |
| O’Hara, John |
| Ohel |
| O. Henry |
| O’Higgins, Ambrosio |
| O’Higgins, Bernardo |
| Ohio, state, United States |
| Ohio, river, United States |
| Ohio and Erie Canal |
| Ohio Company |
| Ohio Company of Associates |
| Ohio State University |
| Ohio University |
| Ohira, Masayoshi |
| Ohlin, Bertil |
| Ohm, Georg Simon |
| ohm |
| ohmmeter |
| Ohm’s law |
| Ohrid |
| Ohrid, Lake |
| Ohthere |
| oil beetle |
| oilbird |
| Oil City |
| oilcloth |
| oil gas |
| oil industry |
| oil of bitter almond |
| oil of vitriol |
| oil of wintergreen |
| oils |
| oil spill |
| oilstone |
| Oirat Autonomous Oblast |
| Oise, department, France |
| Oise, river, Belgium and France |
| Oisin |
| Oistrakh, David Feodorovich |
| Oita |
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| | | The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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