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, 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 services
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, a message in the public interest disseminated by the media without charge Purchase and sale agreement, an agreement between a buyer and a seller
Organizations and authorities
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 Poetry Society of America Poultry Science Association
Other country-specific organizations
Partido Socialista Auténtico (Authentic Socialist Party, Argentina) New Zealand Public Service Association, trade union Palestinian Scout Association Parti Solidaire Africain (Democratic Republic of the Congo), defunct political party Partido Socialista Argentino, the Argentine Socialist Party, a now merged Argentinian political party Partido Socialista de Andalucía (Spain), former name of the Andalusian Party People's Struggle Alliance, Sri Lankan political alliance Petroleum Safety Authority Norway, governmental supervisory authority Philippine Statistics Authority Philippine Support Association, raising credit for the poor Polish Society of Actuaries PSA BPOL a specialised police unit within the Federal Police of Germany PSA International (Singapore), formerly Port of Singapore Authority Public Servants Association of South Africa, trade union Public Services Association (Trinidad and Tobago), a trade union Socialist Party of Aragon (Partido Socialista de Aragón), a now defunct Spanish political party
World-wide scope
Pacific Science Association Pacific Sociological Association Petroleum Safety Authority, former name of the Norwegian Ocean Industry Authority Philosophy of Science Association
Sports
Pro Snowboarders Association Professional Skaters Association Professional Sports Authenticator, an authenticator of sports, trading cards and similarly hand-signed artifacts Professional Squash Association
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), 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 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 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" Palmetto State Armory, an American firearms company based in Columbia, South Carolina.