| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
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| Orlando, Italian form of Roland to Otterbein, Philip William |
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| Orlando, Italian form of Roland |
| Orlando, Vittorio Emanuele |
| Orlando, city, United States |
| Orléanais |
| Orléans, French royal family |
| Orléans, Charles, duc d’ |
| Orléans, Gaston, duc d’ |
| Orléans, Henrietta Anne, duchesse d’ |
| Orléans, Henri Philippe Marie, prince d’ |
| Orléans, Louis, duc d’ |
| Orléans, Louis Philippe Joseph, duc d’ |
| Orléans, city, France |
| Orléans, Île d’ |
| Orley, Bernard van |
| Orlon |
| Orlov, Aleksey Grigoryevich, Count |
| Orlov, Grigori Grigoryevich, Count |
| Orly |
| Ormandy, Eugene |
| Ormazd |
| Ormerod, Eleanor Anne |
| ormolu |
| Ormond Beach |
| Ormonde, James Butler, 12th earl and 1st duke of |
| Ormonde, James Butler, 2d duke of |
| Ormonde, James Butler, 5th earl of |
| Ormonde, Thomas Butler, 10th earl of |
| Ormskirk |
| Ormulum |
| Ormuz |
| Ormuzd |
| ornament, in architecture |
| ornament, in music |
| Ornan |
| Orne |
| ornithopter |
| Oromo |
| Oromocto |
| Oronsay |
| Orontes |
| Orosius, Paulus |
| Oroville Dam |
| Orozco, José Clemente |
| Orpah |
| Orpen, Sir William |
| orphan |
| orphan drug |
| orphan trains |
| Orpheus |
| Orphic Mysteries |
| orphism |
| orpine |
| Orr, Bobby |
| Orr, James Lawrence |
| Orrefors |
| Orrery, Charles Boyle, 4th earl of |
| Orrery, Roger Boyle, 1st earl of |
| orrisroot |
| Orrmulum |
| Orrum, Eilley |
| Ors, Eugenio d’ |
| Orsay, Alfred Guillaume Gabriel, count d’ |
| Orsha |
| Orsini |
| Orsini, Felice |
| Orsk |
| Ortega Saavedra, Daniel |
| Ortega y Gasset, José |
| Ortelius, Abraham |
| orthoclase feldspar |
| orthodontics |
| Orthodox Eastern Church |
| orthopedics |
| Ortles |
| Orton, Joe |
| Ortona |
| Ortygia |
| Oruro |
| Orvieto |
| Orwell, George |
| oryx |
| Os |
| Osage, indigenous people of North America |
| Osage, river, United States |
| Osage orange |
| Osaka |
| O Salutaris Hostia |
| Osama bin Laden |
| Osawatomie |
| Osborn, Henry Fairfield |
| Osborne, Dorothy |
| Osborne, John |
| Osborne, Thomas Burr |
| Osborne, Thomas Mott |
| Osborne House |
| Oscan |
| Oscar I |
| Oscar II |
| Osceola |
| oscillator, electronic |
| oscilloscope |
| Osee |
| Ösel |
| Osgood, Herbert Levi |
| Osh |
| O’Shaughnessy, Arthur William Edgar |
| Oshawa |
| Oshea |
| O-shima |
| Oshkosh |
| Oshogbo |
| Osiander, Andreas |
| osier |
| Osijek |
| Osipenko |
| Osiris |
| Oskaloosa |
| Oskarshamn |
| Öskemen |
| Osler, Sir William |
| Oslo |
| Osman |
| Osman I |
| Osman Nuri Pasha |
| Osmeña, Sergio |
| osmium |
| osmosis |
| Osnabrück |
| Osnappar |
| Osorio, Oscar |
| Osorno |
| osprey |
| Osroene |
| Oss |
| Ossa |
| Ossetia |
| Ossetian Military Road |
| Ossian |
| Ossietzky, Carl von |
| Ossining |
| Ossoli, Marchesa |
| Ossory, Thomas Butler, earl of |
| Ossory |
| Ostade, Adriaen van |
| Ostend |
| Ostend Manifesto |
| osteomyelitis |
| osteopathy |
| osteoporosis |
| Osterman, Andrei Ivanovich, Count |
| Östersund |
| Østfold |
| Ostia |
| ostinato |
| ostracism |
| Ostrava |
| ostrich |
| Ostrogoths |
Ostro  ka |
| Ostrovsky, Aleksandr Nikolayevich |
| Ostwald, Wilhelm |
| O’Sullivan, Timothy H. |
| O’Sullivan Dam |
| Osuna, Pedro Téllez Girón, duque de |
| Oswald, Saint |
| Oswald, Lee Harvey |
| Oswego, city, United States |
| Oswego, river, United States |
| Oswego tea |
| Oswestry |
O wicim |
| Oswy |
| Otaru |
| Otfried von Weissenburg |
| Othman |
| Othman I |
| Othniel |
| Otho |
| Otho, Marcus Salvius |
| Otis, Bass |
| Otis, Elisha Graves |
| Otis, Harrison Gray, 1765–1848, American political leader |
| Otis, Harrison Gray, 1837–1917, American soldier and journalist |
| Otis, James |
| Oto |
| Otomí |
| O’Toole, Peter |
| otosclerosis |
| Otranto |
| Otsego Lake |
| Otsu |
| ottava rima |
| Ottawa, indigenous people of North America |
| Ottawa, city, Canada |
| Ottawa, cities, United States |
| Ottawa, river, Canada |
| Ottawa, University of |
| otter |
| Otter, Peaks of |
| Otterbein, Philip William |
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| | | The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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