Encyclopedias, Almanacs, Transcripts, and Maps
- Perun
- Pesher
- Pesticide Action Network
- Pesticide Residue
- Pet Trade
- Peter the Apostle
- Petr Moghila
- Petre, Maude Dominica
- petrol engine
- Petroleum Exploration and Recovery
- Petromyzoniformes (Lampreys)
- Pettazzoni, Raffaele
- Pétursson, Hallgrímur
- Pfiesteria
- phaeophyte
- Phallus and Vagina
- Phasmida (Stick and Leaf Insects)
- Phenomenology of Religion
- Philippine Creepers (Rhabdornithidae)
- Philistine Religion