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- Alex Parks, singer/songwriter who won Fame Academy in 2003
- Philip Payton historian and Professor of Cornish and Australian Studies
- Andrew Pears, soap manufacturer who invented Pears soap
- William Pengelly, geologist and archeologist
- David Penhaligon, Liberal Member of Parliament
- Susan Penhaligon, actress and writer
- Dolly Pentreath, fish pedlar who claimed to be the last native speaker of the Cornish language.
- Saint Petroc, a patron saint of Cornwall
- John Arthur Phillips, FRS, geologist, metallurgist, mining engineer
- Rosamunde Pilcher, novelist.
- Saint Piran (or Perran), a patron saint of Cornwall and of tin miners
- Kenneth Plummer, rugby player
Read more about this topic: List Of People From Cornwall