| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
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| Otterburn to Padua |
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| Otterburn |
| otterhound |
| Otto I, Holy Roman emperor |
| Otto II, Holy Roman emperor |
| Otto III, Holy Roman emperor |
| Otto IV, Holy Roman emperor |
| Otto I, king of Bavaria |
| Otto I, king of Greece |
| Otto, Austrian archduke |
| Otto, Frei |
| Otto, Nikolaus August |
| Ottocar I |
| Ottocar II |
| Ottoman Empire |
| Ottonian art |
| Otto of Freising |
| Otto the Great |
| Ottumwa |
| Otus |
| Otway, Thomas |
| Ötztal Alps |
| ouabain |
| Ouachita |
| Ouachita Mountains |
| Ouagadougou |
| ouakari |
| Ouargla |
| Ouchy |
| Oud, Jacobus Johannes Pieter |
| Oudenaarde |
| Oudh, historic region, India |
| Oudh, town, India |
| Oudinot, Nicolas Charles |
| Oudjda |
| Oudry, Jean Baptiste |
| Ouessant |
| Ouezzane |
| Ougrée |
| Ouida |
| Ouidah |
| Oujda |
| Oulu |
| ounce, in zoology |
| ounce, unit of measurement |
| Ourense |
| Our Father |
| Ourique |
| Ouro Prêto |
| Ourthe |
| Ouse |
| Ousmane, Sembene |
| Outer Banks |
| Outer Barrier |
| Outer Hebrides |
| Outer Mongolia |
| outer space |
| outrigger |
| Ouwe, Hartmann von |
| ovalbumin |
| ovary |
| ovenbird |
| Overbeck, Johann Friedrich |
| Overbury, Sir Thomas |
| Overijssel |
| Overland Park |
| Overland Trail |
| Overmountain Victory National Historic Trail |
| over-the-counter |
| overture |
| Ovid |
| oviduct |
| Oviedo |
| Ovoca |
| ovolo |
| ovum |
| Owain Glyndwr |
| Owain Gwynedd |
| Owatonna |
| Owen, John |
| Owen, Sir Richard |
| Owen, Robert |
| Owen, Robert Dale |
| Owen, Wilfred |
| Owen Falls |
| Owen Glendower |
| Owens, Jesse |
| Owens |
| Owensboro |
| Owen Sound |
| Owen Stanley Range |
| OWI |
| owl |
| Owl and the Nightingale, The |
| Owo |
| Owosso |
| Owyhee |
| ox |
| oxalic acid |
| oxalis |
| Oxenstierna, Count Axel Gustafsson |
| oxeye |
| Oxford, Edward de Vere, 17th earl of |
| Oxford, Robert Harley, 1st earl of |
| Oxford, city, England |
| Oxford, cities, United States |
| Oxford, Provisions of |
| Oxford and Asquith, Herbert Henry Asquith, 1st earl of |
| Oxford Group |
| Oxford movement |
| Oxford sheep |
| Oxfordshire |
| Oxford University |
| oxidases |
| oxidation and reduction |
| oxidation number |
| oxidative phosphorylation |
| oxide |
| Oxnam, Garfield Bromley |
| Oxnard |
| Oxon |
| oxpecker |
| Oxus |
| oxyacetylene torch |
| oxygen |
| oxygen tent |
| oxy group |
| oxytocin |
| Oyama, Iwao |
| Oyo |
| Oyono, Ferdinand Léopold |
| oyster |
| Oyster Bay |
| oyster catcher |
| oyster plant |
| Oz, Amos |
| Ozaki, Yukio |
| Ozanam, Antoine Frédéric |
| Ozark |
| Ozark Mountains |
| Ozark National Scenic Riverways |
| Ozarks, Lake of the |
| Ozarks, the |
| Ozawa, Seiji |
| Ózd |
| Ozenfant, Amédée |
| Ozias |
| Ozick, Cynthia |
| Ozni |
| ozone |
| ozone layer |
| ozonosphere |
| P |
| Pa |
| Paamiut |
| Paardeberg |
| Paarl |
| Paasikivi, Juho Kusti |
| Pabianice |
| Pablos, Juan |
| Pabna |
| Pabst, G. W. |
| PAC |
| Paca, William |
| pacemaker, artificial |
| Pachacamac |
| Pacheco, Francisco |
| Pachelbel, Johann |
| Pacher, Michael |
| Pa Chin |
| Pachmann, Vladimir de |
| Pachuca de Soto |
| Pachycephalosaurus |
| Pachysandra |
| Pacific, War of the |
| Pacifica |
| Pacific Crest National Scenic Trail |
| Pacific Grove |
| Pacific Margin |
| Pacific Ocean |
| Pacific Rim |
| Pacific Rim National Park |
| Pacific scandal |
| pacifism |
| Pacino, Al |
| packaging |
| Packard Foundation |
| packing industry |
| pack rat |
| Pactolus |
| Padan-aram |
| Padang |
| Paddington |
| paddlefish |
| pademelon |
| Paderborn |
| Paderewski, Ignace Jan |
| Padilla, Ezequiel |
| Padilla, Juan de |
| Padre Island |
| Padua |
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| | | The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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