Encyclopedias, Almanacs, Transcripts, and Maps
- Philosophy: An Overview
- Philosophy: Philosophy and Religion
- Philosophy: Philosophy of Religion
- Phoenician mythology
- Phoenicopteriformes (Flamingos)
- Pholidota (Pangolins)
- Phoronida (Phoronids)
- phosphor
- Phosphorus Removal
- Photic Zone
- Photios
- photocell
- Photochemical Reaction
- Photodegradable Plastic
- Photoperiod
- Photovoltaic Cell
- Phthalates
- Phthiraptera (Chewing and Sucking Lice)
- Phylactolaemata (Freshwater Bryozoans)
- Phyllocarida (Leptostracans)