PCA may refer to:
Medicine and biology Patient-controlled analgesia Patient care assistant/ Personal care assistant, also known as unlicensed assistive personnel Plate count agar in microbiology Polymerase cycling assembly, for large DNA oligonucleotides Posterior cerebral artery Posterior cortical atrophy, a form of dementia Prostate cancer Protein-fragment complementation assay, to identify protein–protein interactions Protocatechuic acid, a phenolic acid Procainamide
Military and government EU–Armenia Partnership and Cooperation Agreement (PCA agreement between Armenia and the EU) Parks Canada Agency Partnership and Cooperation Agreement (EU) Permanent change of assignment in US armed forces
Organizations Business Packaging Corporation of America Peanut Corporation of America, former company Pennsylvania Central Airlines 1936-1948
Education Pacific Coast Academy, fictional school in TV series Zoey 101 Parents and citizens associations for schools in Australia Paris College of Art Pensacola Christian Academy, Florida, US Peoples Christian Academy, Toronto, Ontario, Canada Pineywoods Community Academy, a charter school district in Lufkin, Texas Prestonwood Christian Academy, Plano, Texas Providence Christian Academy (disambiguation), for multiple schools
Games PokerStars Caribbean Adventure, European Poker Tour event Professional Chess Association, from 1993 to 1996
Political parties Parti Communiste Algérien (Algerian Communist Party) Partido Comunista de Andalucía (Communist Party of Andalusia) Partido Comunista de Aragón (Communist Party of Aragon) Partido Comunista de la Argentina (Communist Party of Argentina)
Religion Presbyterian Church of Africa Presbyterian Church in America Presbyterian Church of Australia
Sports Peace Curling Association, the regional governing body for the sport of curling in the Peace River region of Northern Alberta prior to 2018 Philippine Columbian Association, club focusing in tennis in the Philippines Positive Coaching Alliance, US, provides sports training workshops Professional Cricketers' Association, England and Wales Punjab Cricket Association Punjab Cricket Association Stadium, Mohali, India
Other Permanent Court of Arbitration, The Hague, Netherlands Several Police complaints authorities POSC Caesar Association, a standardization organization Production Code Administration, a division of the Motion Picture Association Progressive Citizens of America Progressive Cultural Association, a British political music group
Science and technology para-Chloroamphetamine or 4-Chloroamphetamine Principal component analysis, a statistical procedure Printed circuit assembly or printed circuit board Probabilistic cellular automaton (Math/Stochastic Processes) Protocatechuic acid, a polyphenol antioxidant Pyroglutamic acid, an amino acid derivative Partial combinatory algebra, an abstraction of a model of computation in mathematical logic
Computers Physical configuration audit, in configuration management Polymorphous Computer Architectures, a DARPA project; see Josep Torrellas
Other uses People's Choice Awards, awards show where winners are voted on by the general public Personal carbon allowance, for carbon dioxide emissions Pete Crow-Armstrong, American baseball player Prompt Corrective Action, US banking law