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

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

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Public domain, works whose exclusive intellectual property rights are no longer valid

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

Panic disorder, a condition with excessive fear or anxiety
Parkinson's disease, a degenerative neurological condition
Paroxysmal dyskinesia, a group of movement disorders
Personality disorder, any of various psychiatric problems
Polydipsia, excessive thirst
Progressive disease, in oncology
Psychotic depression, a major depressive episode that is accompanied by psychotic symptoms
Paleolithic diet, a diet based on presumed ancient diets
Phenyldichloroarsine, a blister agent
Pupillary distance, in optometry
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
Pharmacodynamics, the study of how a drug affects an organism

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

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

Pd test, the outcome of using a drop of para-phenylenediamine (also abbr. "Pd") to identify lichens
Palladium (symbol Pd), a chemical element
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

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, a French climbing/mountaineering grade