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- Somsak Panha, from Thailand
- J.J.I. Alcide de Paladilhe from France
- Somwang Patamakanthin (1976-), from Thailand, son of Somnuek Patamakanthin
- Somnuek Patamakanthin, from Thailand, father of Somwang Patamakanthin
- Katherine Evangeline Hilton Van Winkle Palmer (1895–1982), USA, spouse of Ephraim Laurence Palmer, Tertiary molluscs, portrait
- William Harper Pease
- Paul Pelseneer (1863–1945), from Belgium
- George Perry (naturalist), (1771–1???), British naturalist and malacologist
- Edward J. Petuch (born 1949) US paleontologist with malacological interests from the USA
- Sauveur Abel Aubert Petit de la Saussaye (1792–1870), from France
- Georg Johann Pfeffer (1854–1931), German zoologist
- Carl Pfeiffer (malacologist) (?-1852), German malacologist
- Carl Jonas Pfeiffer (1779–1836), German malacologist, uncle of Louis Pfeiffer
- Ludwig Karl Georg Pfeiffer (1805–1877), German physician, botanist and conchologist
- Henry Augustus Pilsbry
- István Pintér (1911–1998), from Hungary
- László Ernö Pintér (1942–2002), from Hungary
- Carlo Pollonera (1849–1923), from Italy
- Winston Ponder
- Guido Poppe
- Valéry Louis Victor Potiez (1806–1870), from France
- Arthur William Baden Powell
- Hugh Berthon Preston (1871–1945)
- Temple Prime
- Alice Pruvot-Fol
Read more about this topic: Malacologist