PCA
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PCA may stand for:
- 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)
- Pacific Coast Academy, the fictional school in which the Nickelodeon television series Zoey 101 is set
- Patient-controlled analgesia (Medicine)
- Permanent Court of Arbitration, based in The Hague and the oldest international institution for dispute resolution (Law)
- Personal Computer Analyzer, a type of Multichannel analyzer used in nuclear and particle physics.
- Person Centered Approach, also known as Rogerian psychotherapy, see Carl Rogers
- Plant Conservation Alliance
- Plate count agar (Microbiology)
- Presbyterian Church in America
- Presbyterian Church of Australia
- Police Complaints Authority, responsible for overseeing the handling of complaints against the police in England and Wales until 2004.
- Principal components analysis (statistics, and in particular signal processing)
- Polymorphous Computer Architectures
- Printed Circuit Assembly
- Professional Chess Association
- Propulsion Controlled Aircraft system, a NASA developed software system for landing an aircraft even if all hydraulics have been lost.
- Protein-fragment Complementation Assay
- PC Anywhere (remote control software by Symantec)