Encyclopedias, Almanacs, Transcripts, and Maps
- Porter, Eliot Furness (1901 – 1990) American Photographer
- Portillo, Michael Denzil Xavier
- Ports and Harbors
- Positional Goods
- Possums and Cuscuses (Phalangeridae)
- post-natal depression
- Postmodernism and Environmental Ethics
- Postures and Gestures
- potential difference
- Potoos (Nyctibiidae)
- Powell, John Wesley (1834 – 1902) American Philosopher, Geologist, Anthropologist, and Scientific Explorer
- Powell, Michael
- Powell, ‘Bud’
- power of numbers
- Power Plants
- Prabhupada, A. C. Bhaktivedanta
- prairie chicken
- Prairie Dogs
- Praj?pati
- Prajñ?