PH (disambiguation)

pH is a measure of acidity or alkalinity.

PH, ph, pH, and Ph may also refer to:
 * Philippines (ISO country code PH), a country located in Southeast Asia

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

 * Port Harcourt, (alternative name of the city)
 * Preston Hollow, Dallas, a neighborhood
 * PH postcode area, postcode area in Scotland

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