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 Psoriatic arthritis (PsA) is a long-term inflammatory arthritis that may occur in some people affected by the autoimmune disease psoriasis. The classic features of psoriatic arthritis include dactylitis (sausage-like swelling of the fingers ...

, an inflammatory disease * ''

Pseudomonas aeruginosa ''Pseudomonas aeruginosa'' is a common Bacterial capsule, encapsulated, Gram-negative bacteria, Gram-negative, Aerobic organism, aerobic–facultative anaerobe, facultatively anaerobic, Bacillus (shape), rod-shaped bacteria, bacterium that can c ...

'', 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 Pressure swing adsorption (PSA) is a technique used to separate some gas species from a mixture of gases (typically air) under pressure according to the species' molecular characteristics and affinity for an adsorbent material. It operates at ne ...

, a technology for separating, or purifying, gases

Computing

Professional services automation Professional services automation (PSA) is software designed to assist professionals, such as lawyers, auditors, and IT consultants, with project management and resource management for client projects and utilization rate management for billable st ...

, 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 Plesk is commercial web hosting and server data center automation software developed for Linux and Windows-based retail hosting service providers. It was developed by Plesk International GmbH'','' a company with headquarters in Toronto, Canad ...

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 Production sharing agreements (PSAs) or production sharing contracts (PSCs) are a common type of contract signed between a government and a resource extraction company (or group of companies) concerning how much of the resource (usually oil) extra ...

, 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 public service announcement (PSA) is a message in the public interest disseminated by the media without charge to raise public awareness and change behavior. Oftentimes these messages feature unsettling imagery, ideas or behaviors that are des ...

Purchase and sale agreement A purchase and sale agreement (PSA), also called a sales and purchase agreement (SPA) or an agreement for purchase and sale (APS), is an agreement between a buyer and a seller of real estate property, company stock, or other assets. The person, ...

, an agreement between a buyer and a seller

Organizations

World-wide scope

Pacific Science Association The Pacific Science Association (PSA) is a regional, non-governmental, scholarly organization that seeks to advance science and technology in support of sustainable development in the Pacific Rim. It was founded in 1920 and its secretariat is bas ...

* Pacific Sociological Association *

Philosophy of Science Association The Philosophy of Science Association (PSA) is an international academic organization founded in 1933 that promotes research, teaching, and free discussion of issues in the philosophy of science from diverse standpoints. The PSA engages in activi ...

* Pro Snowboarders Association *

Professional Skaters Association The American Skaters Guild, later the Professional Skaters Guild of America and then the Professional Skaters Association, was the first skating teachers organization in North America. On August 10, 1938, a meeting took place of thirteen prominen ...

Professional Squash Association The Professional Squash Association, or simply the PSA, is the governing body for the men's and women's professional Squash (sport), squash circuit. The body operates in a similar fashion to the Association of Tennis Professionals, ATP and the ...

Specific to large English-speaking countries

* Australia: **

Pharmaceutical Society of Australia The Pharmaceutical Society of Australia (PSA) is a professional organisation of Australian pharmacists. PSA is the peak national body for pharmacists, representing the pharmacy profession and the 37,000 pharmacists in Australia, with approxima ...

** Public Schools Association, Perth ** Public Service Association of NSW, a trade union ** The Salvation Army, Parramatta * United Kingdom: **

Phone-paid Services Authority The Phone-paid Services Authority (PSA) was the regulatory body for all premium rate phone-paid services in the United Kingdom between 2016 and 2025. It supervised the content, goods and services that consumers could buy by charging the cost to ...

Political Studies Association The Political Studies Association (PSA) is a learned society in the United Kingdom which exists to develop and promote the study of politics. It is the leading association in its field in the United Kingdom, with an international membership includi ...

, 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 The Philippine Statistics Authority (; PSA) is the central statistical authority of the Philippine government that collects, compiles, analyzes, and publishes statistical information on economic, social, demographic, political affairs, and gene ...

* Philippine Support Association, raising credit for the poor * Polish Society of Actuaries *

PSA International PSA International Pte. Ltd., formerly the Port of Singapore Authority, is a global port operator and supply chain company. One of the largest port operators in the world, PSA's portfolio comprises over 70 deepsea, rail, and inland terminals. The ...

(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

Transport

PSA Airlines PSA Airlines, Inc. is an American regional airline headquartered at Dayton International Airport in Dayton, Ohio. The airline is a wholly owned subsidiary of the American Airlines Group and it is paid by fellow group member American 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 S.A., trading as Groupe PSA () (formerly PSA Peugeot Citroën from 1991 to 2016) was a French Multinational corporation, multinational Automotive industry, automotive manufacturing company which produced automobiles and motorcycles unde ...

, ''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, and similarly hand-signed artifacts * Autonomous Socialist Party (disambiguation) * Pisa language or Asue Awyu, ISO 639-3 code psa *

Piscis Austrinus Piscis Austrinus is a constellation in the southern celestial hemisphere. The name is Latin for "the southern fish", in contrast with the larger constellation Pisces, which represents a pair of fish. Before the 20th century, it was also known as ...

(Southern Fish) constellation, IAU abbreviation PsA * Public Storage stock ticker * Power Station of Art, a contemporary art museum in Shanghai, China *

Pressure-sensitive adhesive Pressure-sensitive adhesive (PSA, self-adhesive, self-stick adhesive) is a type of nonreactive adhesive which forms a bond when pressure is applied to bond the adhesive with a surface. No solvent, water, or heat is needed to activate the 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. {{Disambiguation