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Protobranchia (mollusca)
Protococcida (protozoa)
Proton (in physics, chemistry)
Protorosauria (reptilia)
Protostar (in astronomy)
Protozoa (protozoa)
Prymnesiophyceae (algae)
Pseudoborniales (paleobotany)
Pseudosphaeriales (lichens)
Psilotophyta (division)
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Psychoanalysis (in psychology)
Psycholinguistics (in psychology, linguistics)
Psychology (in psychology, science)
Psychopharmacology (in psychology, pharmacology)
Psychophysical methods (experimental psychology)
Psychosis (condition)
Psychotherapy (in psychology)
Psychrometer (instrument)
Pteraspidomorpha (fossil fishes)
Pteridosperms (paleobotany)
Ptychodactiaria (cnidaria)
Public health (branch of medicine)
Pulsar (in astronomy)
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