| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
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| Ojeda, Alonso de to Onnes, Heike Kamerlingh |
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| Ojeda, Alonso de |
| Ojibwa |
| Ojos del Salado |
| Ojukwu, Chukwuemeka Odumegwu |
| Oka, village, Canada |
| Oka, river, central European Russia |
| Oka, river, Siberian Russia |
| Okada, Keisuke |
| Okanagan Lake |
| Okanogan |
| okapi |
| Okara |
| Okavango |
| Okayama |
| Okeechobee, Lake |
| Okeechobee Waterway |
| O’Keeffe, Georgia |
| Okefenokee Swamp |
| Okeghem, Jean d’ |
| Okhotsk, Sea of |
| Okhrida |
| Okinawa |
| Oklahoma |
| Oklahoma, University of |
| Oklahoma City |
| Oklahoma State University |
| Okmulgee |
| okra |
| Okubo, Toshimichi |
| Okuma, Shigenobu |
| Olaf I |
| Olaf II |
| Olaf V |
| Olaf Guthfrithson |
| Olajuwon, Hakeem |
| Öland |
| Olathe |
| Olatunji, Babatunde |
| Olbers, Heinrich Wilhelm Matthäus |
| Olbia |
| Olcott, Henry Steel |
| old age |
| old-age pension |
| Old Castile |
| Oldcastle, Sir John |
| Old Catholics |
| Old Church Slavonic |
| Oldenbarneveldt, Johan van |
| Oldenburg, Claes |
| Oldenburg, former state, Germany |
| Oldenburg, city, Germany |
| Old English |
| old English sheepdog |
| Old Faithful |
| Oldfield, Anne |
| Oldham, John, colonist in New England |
| Oldham, John, English poet and satirist |
| Oldham |
| Old Hundredth |
| Old Ironsides |
| Old Lyme |
| Oldman |
| Old Man of the Mountain, in Islamic history |
| Old Man of the Mountain, rock formation, United States |
| old-man’s-beard |
| Old Norse literature |
| Old Northwest |
| Old Orchard Beach |
| Old Pretender |
| Old Red Sandstone |
| Olds |
| Old Sarum |
| Old Stone Age |
| Old Style dates |
| Old Testament |
| Olduvai Gorge |
| Old Vic |
| Olean |
| oleander |
| oleaster |
| olefin |
| Oleg |
| Olekma |
| Olenek |
| oleomargarine |
| Oléron |
| Olesha, Yuri |
| oleum |
| oligarchy |
| Oligocene epoch |
| oligopoly |
| oligosaccharide |
| Ólimbos |
| Olinda |
| Oliphant, Laurence |
| Oliphant, Margaret Oliphant (Wilson) |
| Olisipo |
| Olitski, Jules |
| Oliva, Peace of |
| Olivares, Gaspar de Guzmán, conde-duque de |
| olive |
| olive oil |
| Oliver, Andrew |
| Oliver, Isaac |
| Oliver, King |
| Olives, Mount of |
| Olivier, Isaac |
| Olivier, Laurence Kerr, Baron Olivier of Brighton |
| Olivier, Sydney Haldane Olivier, 1st Baron |
| olivine |
| Ollivant, Alfred |
| Ollivier, Émile |
| olm |
| Olmec |
| Olmedo, José Joaquin |
| Olmert, Ehud |
| Olmsted, Frederick Law |
| Olmütz |
| Olney, Jesse |
| Olney, Richard |
| Olomouc |
| Ólonos, Mount |
| Olson, Charles |
| Olson, Floyd Bjornstjerne |
| Olsztyn |
| Olten |
| Oltenia |
| Olympia, city, United States |
| Olympia, city, ancient Greece |
| Olympiad |
| Olympian |
| Olympias |
| Olympic elk |
| Olympic games |
| Olympic Mountains |
| Olympio, Sylvanus |
| Olympus |
| Olympus, Mount |
| Olynthus |
| Om |
| Omagh |
| Omaha, indigenous people of North America |
| Omaha, city, United States |
| O’Mahony, John |
| O’Malley, Frank Ward |
| Oman, Sir Charles William Chadwick |
| Oman |
| Omar, caliph |
| Omar, in the Bible |
| Omar Khayyam |
| Ombos |
| ombú |
| ombudsman |
| Omdurman |
| O’Meara, Barry Edward |
| Omei |
| omen |
| Omicron Ceti |
| omnibus |
| omnivore |
| Omphale |
| omphalos |
| Omri |
| Omsk |
| Omuta |
| On |
| Oña, Pedro de |
| onager |
| Onan |
| Onassis, Aristotle Socrates |
| Onassis, Jacqueline Bouvier |
| Oñate, Juan de |
| Oncken, Hermann |
| Oncken, Wilhelm |
| Ondaatje, Michael |
| Ondo |
| O’Neal, Shaquille |
| Onega |
| Onega, Lake |
| Oneida, indigenous people of North America |
| Oneida, city, United States |
| Oneida Lake |
| O’Neil, Buck |
| O’Neill, Eugene (Gladstone) |
| O’Neill, Hugh |
| O’Neill, Margaret |
| O’Neill, Owen Roe |
| O’Neill, Paul Henry |
| O’Neill, Shane |
| O’Neill, Tip |
| O’Neill of the Maine, Terence Marne O’Neill, Baron |
| Oneonta |
| Onesimus |
| Onesiphorus |
| Onganía, Juan Carlos |
| onion |
| Onions, C. T. |
| Onitsha |
| Onkelos |
| Onnes, Heike Kamerlingh |
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| | | The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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