pH is a measure of acidity or alkalinity.
PH, ph, pH, and Ph may also refer to:
Arts and media PistonHeads, a motoring website and forum PH (band), formerly known as Mr. Peter Hayden, a Finnish band Pornhub, a pornographic video sharing website Production house
Aviation Prefix for the Netherlands; see List of aircraft registration prefixes IATA airline designator for Polynesian Airlines; see List of airline codes (P) Transavia Denmark (IATA: PH)
Companies and organizations Parker-Hannifin Corporation (stock ticker PH) Pakatan Harapan (also known as "Alliance of Hope"), a political coalition in Malaysia Pizza Hut, a pizza restaurant chain
Places Philippines (ISO 3166-2 country code PH), a country located in Southeast Asia Port Harcourt, (alternative name of the city) Preston Hollow, Dallas, a neighborhood PH postcode area, postcode area in Scotland
Science and technology Chemistry Phenyl group, either -Ph or Φ, highly-stable and aromatic hydrocarbon unit found in many organic compounds Pleckstrin homology domain, a part of many proteins which bind phosphoinositides with high affinity
Computing .ph, the Philippines' Internet country code top-level domain Ph protocol, an early web database search for CCSO Nameserver described by RFC 2378 PH (complexity), the union of all complexity classes in the polynomial hierarchy in computational complexity theory
Physics Phot, or ph, a measurement of illuminance, in photometry Picohenry, an SI Unit of electrical inductance
Other sciences Planet Hunters, a group that hunts for exoplanets Precipitation hardening, a heat treatment technique used to increase the yield strength of malleable materials Pulmonary hypertension, a medical condition
Other uses pʰ, a phoneme Ph (digraph), a common digraph that represents the phoneme /f/ (voiceless labiodental fricative) in phonetics PH, abbreviation for professional hunter used in East and Southern Africa (ph), a notation used in transcripts to indicate that the transcriber does not know the spelling, usually of a name, and has spelled it as it was pronounced (phonetically) pH Care, a feminine hygiene brand in the Philippines owned by UL Skin Sciences, Inc., a subsidiary of Unilab PH (footballer) (born 1991), Brazilian footballer Philippe Guimarães Poul Henningsen (1894–1967), Danish writer and designer known in Denmark as PH Professional hunter Public house, most commonly referred to as pub, an establishment licensed to serve alcoholic drinks Purple Heart, a US military award, in post-nominal designation Pinch hitter, in baseball abbreviation used to denote the English regnal years of Philip II of Spain Pḥ, abbreviation (e.g. on maps) for parish, also in the meaning of civil parish Phillips, a type of cross-head screw drive bits ⲣⲏ, Coptic for the Egyptian deity Ra Patrouilleurs Hauturiers program of the French Navy
See also Phi (φ), a letter of the Greek alphabet