| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
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| Novara to Sackville, George Sackville Germain, 1st Viscount |
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| Novara | to | Oberlin College |
| Oberon | to | Oita |
| Ojeda, Alonso de | to | Onnes, Heike Kamerlingh |
| Ono | to | Orkney Islands |
| Orlando, Italian form of Roland | to | Otterbein, Philip William |
| Otterburn | to | Padua |
| Paducah | to | Pan-Arabism |
| Panathenaea | to | Paris green |
| Paris Pacts | to | Paternò |
| paternoster | to | Peebles, former county, Scotland |
| Peebles, town, Scotland | to | Peoria |
| Pepi I | to | Periodic Table of the Elements: Terbium |
| Periodic Table of the Elements: Thallium | to | Petipa, Marius |
| Petit, Roland | to | philosophy |
| philosophy of science | to | pigeon English |
| Piggott, Lester Keith | to | pitchblende |
| Pitcher, Molly | to | plutonium |
| Plymouth, city, England | to | Polynesia |
| Polynesian languages | to | Porterville |
| Port-Gentil | to | Prague, Treaty of |
| Prague, University of | to | prism |
| prison | to | pseudocyesis |
| Pseudo-Dionysius | to | Pushtu |
| Pushtunistan | to | Queensland |
| Queensland, University of | to | Rafa |
| Raff, Joseph Joachim | to | rape, in law |
| Rapha | to | Redmond |
| Redon, Odilon | to | Reno |
| Renoir, Jean | to | Rhodes, Knights of |
| Rhodesia | to | Rimouski |
| Rimsky-Korsakov, Nicolai Andreyevich | to | Robusti, Jacopo |
| Roca, Julio Argentino | to | Roman literature |
| Romano, Giulio | to | Rothesay, David Stuart, duke of |
| Rothko, Mark | to | rush |
| Rush-Bagot Convention | to | Sackville, George Sackville Germain, 1st Viscount |
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| | | The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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