Authors: L
- Pirkis, Catherine Louisa 1839-1910
- Pirsson, Louis V. (Louis Valentine) 1860-1919
- Pissarro, Lucien 1863-1944
- Pisuisse, Jean-Louis 1880-1927
- Pitou, Louis Ange 1767-1846
- Pittenger, Lemuel Arthur 1873-1953
- Pitt-Rivers, Augustus Henry Lane-Fox 1827-1900
- Pitt-Rivers, George Henry Lane Fox 1890-1966
- Pitts, John Linwood 1836-1917
- Placentius, Jean-Leo -
- Planck, Max 1858-1947
- Plate, Ludwig 1862-1937
- Platt, Mary Schauffler 1868-1954
- Playfair, R. Lambert (Robert Lambert), Sir 1828-1899
- Plunket, Ierne L. (Ierne Lifford) 1885-1970
- Pogson, Frank Lubecki -1910
- Pohjanpää, Lauri Henrik 1889-1962
- Pohl, Frederik 1919-2013
- Poincaré, Lucien 1862-1920
- Polak, Leo 1880-1941
- Pollen, Maria Margaret -1919
- Pöllnitz, Karl Ludwig, Freiherr von 1692-1775
- Pollock, Frank Lillie 1876-1957
- Pollock, Frederick 1845-1937
- Pommerol, Jean 1859-1921
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