China 
Africa 
- Polarimeters
- Polarimetry
- Polaritons
- Polarity
- Polarizability
- Polarizable continuum model
- Polarization
- Polarization controller
- Polarization density
- Polarization mode dispersion
- Polarization rotator
- Polarization scrambling
- Polarization-division multiplexing
- Polarized light microscopy
- Polarizers
- Polarizing filter
- Polarography
- Polaroid
- Polarons
- Polders
- Pole
- Pole figure
- Pole piece
- Poles
- Policy analysis
- Polio
- Poliovirus
- Polished
- Polished concrete
- Polishing
- Polje
- Pollen
- Polling system
- Pollucite
- Pollutant Release and Transfer Register
- Pollutant load
- Pollutants
- Polluted sediments
- Polluter pays principle
- Pollution
- Pollution prevention
- Poloidal
- Polonium
- Polonium-210
- Poloxamer
- Poloxamer 407
- Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)
- Poly(amidoamine)
- Poly(butyl acrylate)
- Poly(ethyl acrylate)
- Poly(methacrylic acid)
- Poly(n-isopropylacrylamide)
- Poly(p-phenylene vinylene)
- Poly(propylene carbonate)
- Polyacetylene
- Polyacrylamide
- Polyacrylamide gel electrophoresis
- Polyacrylic acid
- Polyacrylonitrile
- Polyaddition
- Polyadenylation
- Polyallylamine hydrochloride
- Polyalphabetic ciphers
- Polyamide
- Polyamide-imide
- Polyamines
- Polyamorphism
- Polyanhydrides
- Polyaniline
- Polyaniline nanofibers
- Polyaryletherketone
- Polyaspartic
- Polyaspartic acid
- Polyatomic ions
- Polybenzimidazole
- Polybenzoxazine
- Polybutadiene
- Polybutadiene acrylonitrile
- Polybutylene
- Polybutylene succinate
- Polybutylene terephthalate
- Polycaprolactone
- Polycarbonate
- Polycarboxylate
- Polycarboxylates
- Polychlorinated biphenyls
- Polychlorinated dibenzodioxins
- Polychlorinated dibenzofurans
- Polychoric correlation
- Polychromator
- Polyclonal
- Polyclonal antibodies
- Polycomb
- Polycondensation
- Polycrystalline
- Polycrystalline silicon
- Polycyclic
- Polycyclic aromatic hydrocarbons
- Polycystic kidney disease
- Polycystic ovary syndrome
- Polycythemia
- Polycythemia vera
- Polydadmac
- Polydiacetylenes
- Polydimethylsiloxane
- Polydipsia
- Polyelectrolyte adsorption
- Polyelectrolytes
- Polyenes
- Polyester
- Polyester resin
- Polyether block amide
- Polyether ether ketone
- Polyetherimide
- Polyethylene
- Polyethylene glycol
- Polyethylene naphthalate
- Polyethylene terephthalate
- Polyethylenimine
- Polyfluorene
- Polygalacturonase
- Polygene
- Polygenic
- Polygenic scores
- Polyglutamic acid
- Polyglycolic acid
- Polyglycolide
- Polygon
- Polygon mesh
- Polygonal chain
- Polygons
- Polygraph
- Polyhalite
- Polyhedral combinatorics
- Polyhedron
- Polyhydramnios
- Polyhydroxyalkanoates
- Polyhydroxybutyrate
- Polyimide
- Polyimide foam
- Polyiodide
- Polyisobutylene
- Polyisocyanurate
- Polyisoprene
- Polyketide synthase
- Polyketides
- Polylactic acid
- Polylysine
- Polymatroid
- Polymer adsorption