| Paedology |
Study of children |
| Paedotrophy |
Art of rearing children |
| Paidonosology |
Study of children's diseases; pediatrics |
| Palaeoanthropology |
Study of early humans |
| Palaeobiology |
Study of fossil plants and animals |
| Palaeoclimatology |
Study of ancient climates |
| Palaeolimnology |
Study of ancient fish |
| Palaeolimnology |
Study of ancient lakes |
| Palaeontology |
Study of fossils |
| Palaeopedology |
Study of early soils |
| Paleobotany |
Study of ancient plants |
| Paleo-osteology |
Study of ancient bones |
| Palynology |
Study of pollen |
| Papyrology |
Study of paper |
| Parapsychology |
Study of unexplained mental phenomena |
| Parasitology |
Study of parasites |
| Paroemiology |
Study of proverbs |
| Parthenology |
Study of virgins |
| Pataphysics |
The science of imaginary solutions |
| Pathology |
Study of disease |
| Patrology |
Study of early christianity |
| Pedagogics |
Study of teaching |
| Pedology |
Study of soils |
| Pelology |
Study of mud |
| Penology |
Study of crime and punishment |
| Periodontics |
Study of gums |
| Peristerophily |
Pigeon-collecting |
| Pestology |
Science of pests |
| Petrology |
Study of rocks |
| Pharmacognosy |
Study of drugs of animal and plant origin |
| Pharmacology |
Study of drugs |
| Pharology |
Study of lighthouses |
| Pharyngology |
Study of the throat |
| Phenology |
Study of organisms as affected by climate |
| Phenomenology |
Study of phenomena |
| Philately |
Study of postage stamps |
| Philematology |
The act or study of kissing |
| Phillumeny |
Collecting of matchbox labels |
| Philology |
Study of ancient texts; historical linguistics |
| Philosophy |
Science of knowledge or wisdom |
| Phoniatrics |
Study and correction of speech defects |
| Phonology |
Study of speech sounds |
| Photobiology |
Study of effects of light on organisms |
| Phraseology |
Study of phrases |
| Phrenology |
Study of bumps on the head |
| Phycology |
Study of algae and seaweeds |
| Physics |
Study of properties of matter and energy |
| Physiology |
Study of processes of life |
| Phytology |
Study of plants; botany |
| Piscatology |
Study of fishes |
| Pisteology |
Science or study of faith |
| Planetology |
Study of planets |
| Plutology |
Political economy; study of wealth |
| Pneumatics |
Study of mechanics of gases |
| Podiatry |
Study and treatment of disorders of the foot; chiropody |
| Podology |
Study of the feet |
| Polemology |
Study of war |
| Pomology |
Study of fruit-growing |
| Posology |
Science of quantity or dosage |
| Potamology |
Study of rivers |
| Praxeology |
Study of practical or efficient activity; science of efficient action |
| Primatology |
Study of primates |
| Proctology |
Study of rectum |
| Prosody |
Study of versification |
| Protistology |
Study of protists |
| Proxemics |
Study of man’s need for personal space |
| Psalligraphy |
The art of paper-cutting to make pictures |
| Psephology |
Study of election results and voting trends |
| Pseudology |
Art or science of lying |
| Pseudoptics |
Study of optical illusions |
| Psychobiology |
Study of biology of the mind |
| Psychogenetics |
Study of internal or mental states |
| Psychognosy |
Study of mentality, personality or character |
| Psychology |
Study of mind |
| Psychopathology |
Study of mental illness |
| Psychophysics |
Study of link between mental and physical processes |
| Pteridology |
Study of ferns |
| Pterylology |
Study of distribution of feathers on birds |
| Pyretology |
Study of fevers |
| Pyrgology |
Study of towers |
| Pyroballogy |
Study of artillery |
| Pyrography |
Study of woodburning |
