Historians, Miscellaneous: Biographies
- Peter Eisenman
- Petr Alekseevich Kropotkin
- Philip Ainsworth Means
- Philip Johnson
- Philipp Lenard
- Phoebe Palmer
- Pierre Maurice Marie Duhem
- Pieter the Elder Bruegel
- Pogonophorans
- Pope Pius V
- Quin Shi Huang-Di
- Rabindranath Tagore
- Rachel Fuller Brown
- Radovan Karadzic
- Ralph Tyler
- Rammohan Ray
- Ranulf Flambard
- Ratko Mladic
- Raul Prebisch
- Rebecca Lukens