Authors: O
- Parkhill, Forbes 1892-1974
- Pattie, James O. (James Ohio) -
- Paulding, James Kirke 1778-1860
- Paullin, Charles Oscar 1868-1944
- Peerless Orchestra (Edison studio ensemble) -
- Peninsular and Oriental Steam Navigation Company -
- Perkins, Frederick Orville -
- Perrier, Edmond 1844-1921
- Petersen, Carl Olof 1881-1939
- Peterson-Berger, Wilhelm 1867-1942
- Petőfi, Sándor 1823-1849
- Pfleiderer, Otto 1839-1908
- Pfungst, Oskar 1874-1933
- Pickard-Cambridge, Octavius 1828-1917
- Pick, Otto 1887-1940
- Picón, Jacinto Octavio 1852-1923
- Piirinen, Hanna 1881-1955
- Pirenne, Henri 1862-1935
- Pitray, Olga de 1835-1909
- Playfair, William 1759-1823
- Pletsch, Oscar 1830-1888
- Plumer of Messines, Herbert Charles Onslow Plumer, Viscount 1857-1932
- Poli, Oscar de (Philippe François Joseph) 1838-1908
- Potamian, Brother 1837-1917
- Potter, Olave M. (Olave Muriel) -
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