| Plumbago indica | Plumber | Plumbing |
| Plumbing fixture | Plumeria alba | Plumeria rubra |
| Plumerville, Arkansas | Plummer, Minnesota | Plummer–Vinson syndrome |
| Plummet | Plunger | Plural society |
| Pluralism (political theory) | Pluralism in economics | Pluralist school |
| Pluralistic ignorance | Plurality voting system | Plurality-at-large voting |
| Pluriculturalism | Plurinationalism | Plurk |
| Plurk.com | Plus and minus signs | Pluteaceae |
| Pluteus salicinus | Pluto (Disney) | Plutocracy |
| Plutonium | Plutonium(III) chloride | Plutonium-239 |
| Plutus | Plutus (play) | Pluvial |
| Pluvial lake | Pluvialis | Pluvialis apricaria |
| Pluvialis fulva | Pluvialis squatarola | Pluvianus aegyptius |
| Plymouth Fury | Plymouth Township, Michigan | Plymouth Village, Kentucky |
| Plymouth, Illinois | Plymouth, Indiana | Plymouth, Iowa |
| Plymouth, Juneau County, Wisconsin | Plymouth, Michigan | Plymouth, Minnesota |
| Plymouth, Montserrat | Plymouth, Nebraska | Plymouth, Rock County, Wisconsin |
| Plymouth, Sheboygan County, Wisconsin | Plymouth, Utah | Plymouth, Vermont |
| Plymouth, Wisconsin | Plywood | Pm |
| PM20D1 | Pneumatic barrier | Pneumatic fracturing |
| Pneumatic motor | Pneumoconiosis | Pneumocystidaceae |
| Pneumocystidales | Pneumocystidomycetes | Pneumocystis |
| Pneumocystis carinii | Pneumocystis jirovecii | Pneumocystis murina |
| Pneumocystis pneumonia | Pneumocystis wakefieldiae | Pneumocystosis |
| Pneumodesmus newmani | Pneumonia | Pneumonia (disambiguation) |
| Pneumonitis | Pneumonoultramicroscopicsilicovolcanoconiosis | Pneumoparotitis |
| Pneumoperitoneum | Pneumothorax | PNG |
| Png | Pnictogen | PNNL |
| PNUD | PNV | Po |
| Po-i-Kalyan | Poa | Poa annua |
| Poa bulbosa | Poa pratensis | Poaceae |
| Poales | Poanae | Pobed. |
| Poca, West Virginia | Pocahontas (1995 film) | Pocahontas, Arkansas |
| Pocahontas, Illinois | Pocahontas, Iowa | Pocahontas, Missouri |
| Pockels effect | Pocket | Pocket beach |
| Pocket knife | Pocket PC | Pocket watch |
| PocketStation | Pocomoke City, Maryland | Podargidae |
| Podargus | Podargus ocellatus | Podargus papuensis |
| Podargus strigoides | Podaxis | Podaxis pistillaris |
| Podcast | Podgorica | Podiceps |
| Podiceps andinus | Podiceps auritus | Podiceps cristatus |
| Podiceps gallardoi | Podiceps grisegena | Podiceps major |
| Podiceps nigricollis | Podiceps occipitalis | Podiceps taczanowskii |
| Podicipedidae | Podium | Podocarpaceae |
| Podocarpus | Podocarpus alpinus | Podocarpus brasiliensis |
| Podocarpus elatus | Podocarpus elongatus | Podocarpus macrophyllus |
| Podocarpus palawanensis | Podoces biddulphi | Podoces hendersoni |
| Podoces panderi | Podoces pleskei | Podophyllum peltatum |
| Podophyllum resin | Podoplea | Podospermum |
| Podospermum alpigenum | Podospermum canum | Podospermum purpureum |
| Podostemaceae | Podostemum | Podostemum ceratophyllum |
| Podostemum dichotomum | Podostemum distichum | Podostemum fruticulosum |
| Podostemum minor | Podostemum muelleri | Podostemum ovatum |
| Podoviridae | Poe's law | Poeae |
| Poecilarcys ditissimus | Poecile | Poecile davidi |
| Poecile hypermelaenus | Poecile hyrcanus | Poecile lugubris |
| Poecile montanus | Poecile palustris | Poecile songarus |
| Poecile superciliosus | Poecile weigoldicus | Poecilia |
| Poecilia latipinna | Poecilia reticulata | Poecilia sphenops |
| Poecilia velifera | Poeciliidae | Poecilogale albinucha |
| Poelagus marjorita | POEMS syndrome | Poepp. |
| Poetic Justice | Poetic Justice (film) | Poetics (Aristotle) |
| Poetry | Poetry of Maya Angelou | Poetry of the Republic of Turkey |
| Poetry slam | Poggendorff illusion | Poggio Bracciolini |
| Pogoniulus | Pogoniulus atroflavus | Pogoniulus bilineatus |
| Pogoniulus chrysoconus | Pogoniulus coryphaea | Pogoniulus coryphaeus |
| Pogoniulus leucomystax | Pogoniulus scolopaceus | Pogoniulus simplex |
| Pogoniulus subsulphureus | Pogostemon | Pogostemon andersonii |
| Pogostemon atropurpureus | Pogostemon auricularius | Pogostemon benghalensis |
| Pogostemon cablin | Pogostemon esquirolii | Pogostemon hirsutus |
| Pogostemon nigrescens | Pogostemon pubescens | Pogostemon travancoricus |
| Pogostemon trinervis | Pogostemoneae | Pogrom |
| Pohang | Pohénégamook | Pohl |
| Poiana | Poiana leightoni | Poiana richardsonii |
| Poicephalus rueppellii | Poicephalus senegalus | Poikilotherm |
| Poincaré group | Point (geometry) | Point and click |
| Point at infinity | Point bar | Point cloud |
| Point group | Point Hope, Alaska | Point particle |
| Point Pleasant, West Virginia | Point, Texas | Point-of-care testing |
| Point-to-point protocol over Ethernet | Pointe Aux Barques Township, Michigan | Pointe Coupee Parish, Louisiana |
| Pointe-aux-Outardes, Quebec | Pointe-à-la-Croix, Quebec | Pointe-Calumet, Quebec |
| Pointe-Claire | Pointe-des-Cascades, Quebec | Pointe-Fortune, Quebec |
| Pointe-Lebel, Quebec | Pointer (computer programming) | Pointing device |
| Pointing stick | Points of the compass | Poir. |
| Poise | Poison Girl | Poison Ivy (1992 film) |
| Poisoned Pawn Variation | Poisoning the well | Poisson distribution |
| Poisson regression | Poisson's ratio | Poit. |
| Poitiers – Biard Airport | Poka-yoke | Pokagon Township, Michigan |
| Pokémon | Pokémon (disambiguation) | Pokémon Gold and Silver |
| Pokémon Origins | Pokémon: Lucario and the Mystery of Mew | Pokemon |
| Pokemon go | Poker | Poker Face |
| Pokhara | Pokkén Tournament | Pol Pot |
| Pol van Boekel | Pol-e Azh | Pol-e Bala Rud |
| Pol-e Mun | Pol-e Sefid | Pol-e Zal |
| Polaciones | Polan District | Polanco, Cantabria |
| Poland | Poland syndrome | Poland, Ohio |
| Polandball | Polar body | Polar climate |
| Polar coordinate system | Polar covalent bond | Polar curve (aerodynamics) |
| Polar motion | Polar orbit | Polar vortex |
| Polar, Wisconsin | Polarimeter | Polaris |
