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.