Encyclopedias, Almanacs, Transcripts, and Maps
- Petroleum, Oil, and Natural Gas
- Petromin
- Petronievi?, Branislav (1875–1954)
- Petropólis
- Petrópolis, Treaty of (1903)
- Petrovi?-Njegoš, Petar (1813–1851)
- Pettit, Robert E. Lee, Jr. ("Bob")
- Pettoruti, Emilio (1892–1971)
- Petty, Richard Lee
- Petzoldt, Joseph (1862–1929)
- Pezet, Juan Antonio (1809–1879)
- Pfänder, Alexander (1871–1941)
- Pforzheimer, Walter Lionel
- Phantasia
- Pharaonicism
- PHATIC COMMUNION
- Phelps, Anthony (1928–)
- Phenomenalism
- Phenomenological Psychology
- Philbrick Herbert Arthur