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PSA, PsA, Psa, or psa may refer to:
Video PSA
Airlines and airports
- PSA Airlines, a subsidiary of American Airlines Group
- Pisa International Airport, Pisa, Italy, IATA code PSA
- Pacific Southwest Airlines, US, 1949 to 1988, ICAO code PSA
Maps PSA
Art and culture
- Power Station of Art, a contemporary art museum in Shanghai, China
- Public service announcement

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Astronomy
- Piscis Austrinus (Southern Fish) constellation, IAU abbreviation PsA

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Automotive
- Groupe PSA, a French multinational automobile manufacturer, PSA being short for "Peugeot Société Anonyme"

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Biology
- Primary systemic amyloidosis, a disease caused by the accumulation of abnormal proteins
- Prostate-specific antigen, test for prostate cancer
- Psoriatic arthritis (PsA), an inflammatory disease
- Pseudomonas aeruginosa
- Pseudomonas syringae pv actinidiae, a pathovar of a bacterium that attacks kiwifruit

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Chemistry
- Polar surface area, the surface sum over all polar atoms of a molecule
- Pressure swing adsorption, a technology for purifying gases

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Computing
- Plesk Server Administrator, a commercial web hosting automation program
- Professional services automation software, a project and resource management suite

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Contracts, legislation, and government
- Passenger Vessel Services Act of 1886 or Passenger Services Act, US
- Problem-solution approach, an approach for assessing inventive step at the European Patent Office
- Production sharing agreement, a contract between a government and a resource extraction company
- Public service agreement, UK government department targets for 3-year period

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Organizations
With world-wide scope
- Pacific Science Association
- Pacific Sociological Association
- Philosophy of Science Association
- Pro Snowboarders Association
- Professional Skaters Association
- Professional Squash Association
Pertaining to former Public Securities Association
- PSA prepayment model, developed in 1985
- Successor organizations:
-
- Bond Market Association (starting 1997)
- Securities Industry and Financial Markets Association (since 2006)
Specific to large English-speaking countries
- Australia:
- Pharmaceutical Society of Australia
- Public Schools Association, Perth
- Public Service Association of NSW, a trade union
- The Salvation Army, Parramatta
- United Kingdom:
- Phone-paid Services Authority
- Political Studies Association, for academics
- Professional Standards Authority for Health and Social Care
- Property Services Agency, former government agency
- United States:
- Partnership for a Secure America
- Photographic Society of America
- Pi Sigma Alpha, college honor society for political science
- Poultry Science Association
Other country-specific organizations
- (Democratic Republic of the Congo) Parti Solidaire Africain, defunct political party
- New Zealand Public Service Association, trade union
- (Norway) Petroleum Safety Authority Norway, governmental supervisory authority
- Palestinian Scout Association
- Philippine Support Association, raising credit for the poor
- Polish Society of Actuaries
- (Singapore) PSA International, formerly Port of Singapore Authority
- (South Africa) Public Servants Association of South Africa, trade union
- (Spain) Partido Socialista de Andalucía, former name of the Andalusian Party
- (Trinidad and Tobago) Public Services Association, a trade union

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Other uses
- Pisa language or Asue Awyu, ISO 639-3 code psa
- "PSA", precursor to the R.E.M. song "Bad Day"
- PSA prepayment model, developed by the Public Securities Association
- Pressure-sensitive adhesive
- Public service announcement
- Purchase and Sale Agreement, an agreement between a buyer and a seller
Source of the article : Wikipedia