PSA

PSA, PsA, Psa, or psa may refer to:

Biology and medicine

 * Posterior spinal artery
 * Primary systemic amyloidosis, a disease caused by the accumulation of abnormal proteins
 * Prostate-specific antigen, an enzyme used as a blood tracer for prostate cancer
 * Psoriatic arthritis (PsA), an inflammatory disease
 * Pseudomonas aeruginosa, a species of bacterium
 * Pseudomonas syringae pv. actinidiae, a pathovar of a bacterium that attacks kiwifruit

Chemistry

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

Computing

 * Professional services automation, software for automating project and billing management for professional service firms
 * PSA Certified, Platform Security Architecture, a security certification for the Internet of Things
 * Plesk Server Administrator, a commercial web hosting automation program
 * Persistent staging area, a staging area in data vault modeling

Contracts, legislation, and government

 * Passenger Vessel Services Act of 1886 or Passenger Services Act, US
 * Payment Services Act, Singapore
 * Primary statistical area, a collective term for metropolitan, micropolitan, and combined statistical areas
 * 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 Safety Act, a law in Jammu and Kashmir
 * Public service agreement, UK government department targets for 3-year period
 * Public service announcement
 * Purchase and sale agreement, an agreement between a buyer and a seller

World-wide scope

 * Pacific Science Association
 * Pacific Sociological Association
 * Philosophy of Science Association
 * Pro Snowboarders Association
 * Professional Skaters Association
 * Professional Squash Association

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

 * Parti Solidaire Africain (Democratic Republic of the Congo), defunct political party
 * New Zealand Public Service Association, trade union
 * PSA BPOL a specialised police unit within the Federal Police of Germany
 * Petroleum Safety Authority Norway, governmental supervisory authority
 * Palestinian Scout Association
 * Philippine Statistics Authority
 * Philippine Support Association, raising credit for the poor
 * Polish Society of Actuaries
 * PSA International (Singapore), formerly Port of Singapore Authority
 * Public Servants Association of South Africa, trade union
 * Partido Socialista de Andalucía (Spain), former name of the Andalusian Party
 * Socialist Party of Aragon (Partido Socialista de Aragón), a now defunct Spanish political party
 * Authentic Socialist Party (Argentina), Partido Socialista Auténtico
 * Public Services Association (Trinidad and Tobago), a trade union
 * Partido Socialista Argentino, the Argentine Socialist Party, a now merged Argentinian political party

Transport

 * 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
 * Penn Station Access, a planned New York City rail upgrade
 * PSA Group, Peugeot Société Anonyme, a defunct French multinational automobile manufacturer now part of Stellantis

Other uses

 * "PSA" (song) by SZA, from the album Lana (2023)
 * PSA 5.7 Rock, a pistol
 * Penal substitutionary atonement, a theory of atonement in Christianity
 * Professional Sports Authenticator (PSA), an authenticator of sports and trading cards
 * Autonomous Socialist Party (disambiguation)
 * Pisa language or Asue Awyu, ISO 639-3 code psa
 * Piscis Austrinus (Southern Fish) constellation, IAU abbreviation PsA
 * Public Storage stock ticker
 * PSA Ambon, an Indonesian football club
 * Power Station of Art, a contemporary art museum in Shanghai, China
 * Pressure-sensitive adhesive
 * "PSA", title of an earlier version of the R.E.M. song "Bad Day"