PD

PD, P.D., or Pd may refer to:

Arts and media

 * People's Democracy (newspaper), weekly organ of the Communist Party of India (Marxist)
 * The Plain Dealer, a Cleveland, Ohio, US newspaper
 * Post Diaspora, a time frame in the Honorverse series of science fiction novels
 * Principia Discordia, a 1965 holy text in Discordianism
 * Production designer, a profession in film or television
 * Production diary, a promotional video podcast
 * Public domain, a copyright status

Economics and business

 * Personnel department, of an organization
 * Price discrimination, a microeconomic pricing strategy
 * Probability of default, used in finance (Basel II)
 * Professional degree, or first professional degree
 * Professional development, learning to earn or maintain professional credentials
 * Program director, in service industries
 * Public Debt, of a government

Companies

 * Phelps Dodge, a former American mining company, now part of Freeport-McMoRan
 * Polyphony Digital, developer of the Gran Turismo video game series
 * Porter Airlines (IATA airline designator), a regional airline headquartered at Billy Bishop Toronto City Airport, Canada

Government and law

 * Police department
 * Preventive detention, an imprisonment that is putatively justified for non-punitive purposes
 * Property damage liability, in insurance
 * Public defender, an attorney appointed to represent people who cannot afford to hire one
 * Public domain, works whose exclusive intellectual property rights are no longer valid
 * Punitive damages

Political parties

 * Democratic Party of Albania (Partia Demokratike), a centre-right political party in Albania
 * Democratic Party (Indonesia) (Partai Demokrat), a political party in Indonesia
 * Democratic Party (Italy) (Partito Democratico), a centre-left political party in Italy
 * Democratic Party (Malta) (Partit Demokratiku), a centre-left political party in Malta
 * Democratic Party (Romania) (Partidul Democrat), a social-democratic and, later, a centre-right political party in Romania
 * Democratic Party – demokraci.pl (Partia Demokratyczna – demokraci.pl), Poland
 * Party of Democrats (Partito dei Democratici), a defunct political party in San Marino
 * People's Democracy (Ireland), a defunct political organization in Ireland
 * Progressive Democrats, a defunct political party in the Republic of Ireland

Places

 * Province of Padua (ISO 3166-2:IT), Italy
 * Port Dickson (town), a coastal city in Negeri Sembilan, Malaysia

Professions

 * Doctor of Pharmacy, also abbreviated PharmD
 * Postdoctoral, a research position or course of study
 * Privatdozent, a title or position especially in German universities
 * Production designer, a profession in film or television

Medicine

 * Paleolithic diet, a diet based on presumed ancient diets
 * Panic disorder, a condition with excessive fear or anxiety
 * Parkinson's disease, a degenerative neurological condition
 * Paroxysmal dyskinesia, a group of movement disorders
 * Pediatric dentistry, mouth health care and tooth repair for children
 * Peritoneal dialysis, a way to filter the blood when the kidneys are not working well
 * Personality disorder, any of various psychiatric problems
 * Peyronie's disease, a connective tissue disorder involving the growth of fibrous plaques in the soft tissue of the penis
 * Pharmacodynamics, the study of how a drug affects an organism
 * Phenyldichloroarsine, a blister agent and vomiting agent
 * Polydipsia, excessive thirst
 * Progressive disease, a disease that continues to worsen and often has no proven total cure
 * Psychotic depression, a major depressive episode that is accompanied by psychotic symptoms
 * Pupillary distance, in optometry

Computing

 * Pentium D, a dual-core variant of the Pentium 4 processor
 * Perfect Dark (P2P), a Japanese peer-to-peer file-sharing (P2P) application designed for use with Microsoft Windows
 * Phase-change Dual, an optical media format
 * Pure Data, the graphical audio-processing language
 * USB PD (USB Power Delivery), an extension of the USB standard

Physics

 * Photodiode, a semiconductor device that converts light into current
 * Potential difference, or voltage
 * Partial discharge, an undesirable discharge phenomenon in high voltage dielectrics

Other uses in science and technology

 * PD resistor, a pull-down resistor
 * Pd test, the outcome of using a drop of para-phenylenediamine (also abbr. "Pd") to identify lichens
 * Palladium, symbol Pd, a chemical element
 * Photodisinfection, an alternative name for Antimicrobial Photodynamic Therapy
 * Point-defence, a category of weapons
 * Axiom of projective determinacy, in mathematical logic
 * Pumpe Düse, a Volkswagen Group name for Unit Injector diesel engine technology

Other uses

 * The NYSE ticker symbol of PagerDuty
 * Padang railway station, West Sumatra, Indonesia (station code)
 * Full stop (or period, in American English), used in coded military communications
 * Personal development, as used in the self-help and personal growth requiring fields
 * peu difficile, in mountaineering, "little difficult" climbing grade International French adjectival system