pSA

• 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

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

• 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

• 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

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

• 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

• 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
• People's Struggle Alliance, Sri Lankan political alliance

• 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

• "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, and similarly hand-signed artifacts
• 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.

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