China 
Africa 
- Pore structure
- Pore water pressure
- Pores
- Porin
- Poroelasticity
- Poromechanics
- Porosimetry
- Porosity
- Porous glass
- Porous media
- Porous silicon
- Porphine
- Porphobilinogen
- Porphobilinogen deaminase
- Porphyria
- Porphyrin
- Porphyrin complexes
- Porphyritic
- Porphyroblasts
- Porphyromonas gingivalis
- Porphyry
- Porphyry copper
- Port mirroring
- Port of Santos
- Port of entry
- Port reception facilities
- Port-wine stain
- Portable applications
- Portable computers
- Portable toilets
- Portable ultrasound
- Portal hypertension
- Portal triad
- Portal vein
- Portal venous system
- Portals
- Ported
- Portland cement
- Portlandite
- Portmanteau test
- Ports
- Portuguese pavement
- Pose
- Pose tracking
- Position
- Position error
- Position sensor
- Positional tracking
- Positioning
- Positioning system
- Positive
- Positive airway pressure
- Positive definite
- Positive definiteness
- Positive feedback
- Positive operators
- Positive predictive value
- Positive pressure
- Positive pressure ventilation
- Positive systems
- Positive-definite functions
- Positive-definite kernel
- Positron annihilation spectroscopy
- Positron emission
- Positron emission mammography
- Positronium
- Positrons
- Possibility theory
- Possible world
- Post and lintel
- Post combustion capture
- Post hoc analysis
- Post processor
- Post weld heat treatment
- Post-Hartree-Fock
- Post-WIMP
- Post-combustion capture
- Post-concussion syndrome
- Post-consumer waste
- Post-fordism
- Post-glacial rebound
- Post-hoc analysis
- Post-polio syndrome
- Post-quantum cryptography
- Post-silicon validation
- Post-stroke depression
- Post-transcriptional regulation
- Post-transition metals
- Post-translational modification
- PostGIS
- PostScript
- Postcentral gyrus
- Postconditions
- Postediting
- Posterior chamber
- Posterior cingulate cortex
- Posterior communicating artery
- Posterior cranial fossa
- Posterior descending artery
- Posterior distribution
- Posterior fontanelle
- Posterior longitudinal ligament
- Posterior parietal cortex
- Posterior pituitary
- Posterior pole
- Posterior predictive distribution
- Posterior probability
- Posterior sacroiliac ligament
- Posterior shoulder
- Posterior tibial artery
- PostgreSQL
- Postmarketing surveillance
- Postprandial
- Postreplication repair
- Posts
- Postsynaptic potential
- Postulates of special relativity
- Posturography
- Posynomial
- Potash
- Potassium
- Potassium acetate
- Potassium alum
- Potassium amyl xanthate
- Potassium bicarbonate
- Potassium bitartrate
- Potassium bromide
- Potassium carbonate
- Potassium channels
- Potassium chlorate
- Potassium chromate
- Potassium cyanate
- Potassium dichromate
- Potassium ethyl xanthate
- Potassium ferrate
- Potassium ferrioxalate
- Potassium ferrocyanide
- Potassium formate
- Potassium hydrogen phthalate
- Potassium hydroxide
- Potassium hypochlorite
- Potassium lactate
- Potassium nitrate
- Potassium nitrite
- Potassium oxide
- Potassium perchlorate
- Potassium periodate
- Potassium permanganate
- Potassium peroxymonosulfate
- Potassium persulfate