- Pasteur, Louis
- Pasteur Institute
- Patagonia
- Patapsco
- Patent
- Paterson, N. J.
- Paterson, William
- Patmore, Coventry Kearsey Deighton
- Patmos
- Patna
- Paton, John Gibson
- Patriarch, Greek
- Patrick, Saint
- Patti, Adelina
- Patton, Francis Landey
- Paul
- Paul II (Alexander Farnése)
- Paul IV (Giovanni Pietro Caraffa)
- Paul V (Camillo Borghése
- Paul, Herbert
- Paul, Saint
- Pauncefote, Julian
- Pausanias
- Pavement
- Pavia
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- Pawnees
- Paw-Paw
- Pawtucket, R. I.
- Paxton, Sir Joseph
- Payne, John Howard
- Peabody, Andrew Preston
- Peabody, Elizabeth Palmer
- Peabody, George
- Peabody, Mass.
- Peace River
- Peace Societies
- Peach
- Peach-Tree Borer
- Peacock
- Peale, Charles Wilson
- Peale, Rembrandt
- Peanut
- Pear
- Pearl
- Pearl (river)
- Pearl Harbor
- Pearsons, Daniel Kimball
- Peary, Robert Edwin
- Peasants' War
- Peat
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