PSA

PSA may refer to:

• PSA International (formerly Port of Singapore Authority), world's second largest port operator
• PSA Peugeot Citroën, French vehicle manufacturer
• PSA prepayment model, developed by the Bond Market Association (formerly the Public Securities Association)
• Primary Systemic Amyloidosis, in which a human body produces "bad proteins"
• Pressure-sensitive adhesive
• Prostate-specific antigen, a protein that helps to identify prostate cancer in a widely used test
• Public service announcement
• Probabilistic safety assessment
• "PSA", precursor to the R.E.M. song "Bad Day"
• "Pseudomonas syringae actinidiae", a variety of a bacteria Pseudomonas syringae that attacks kiwifruit

Airlines and airports

• PSA Airlines, a subsidiary of US Airways, Inc.
• PSA, ICAO code for Pacific Southwest Airlines, an American airline that operated from 1949 to 1988
• PSA, IATA code for Galileo Galilei Airport, Pisa, Italy

Chemistry

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

Computing

• Plesk Server Administrator, a commercial web hosting automation program
• Professional services automation software, a project and resource management suite

Contracts, legislation, and government

• Passenger Vessel Services Act of 1886, also known as the Passenger Services Act, United States cabotage legislation
• Production sharing agreement, a contract between a government and a resource extraction company
• Public service agreement, details the aims and objectives of UK government departments for a three-year period

Organizations

• Photographic Society of America
• Pacific Science Association
• Philosophy of Science Association
• Professional Squash Association
• World Indoor Soccer League (formerly the Premier Soccer Alliance)

Australia

• Pharmaceutical Society of Australia
• Public Service Association of NSW, a trade union
• Public Schools Association, Perth
• The Salvation Army, Parramatta, Sydney

New Zealand

• New Zealand Public Service Association, a trade union

Pakistan

• Pakistan Student Association

Philippines

• Philippine Support Association, a group that raises credit for the poor

Poland

• Polish Society of Actuaries

South Africa

• Public Servants Association of South Africa, a trade union

Spain

• Andalusian Party, a political party

Trinidad and Tobago

• Public Services Association, a trade union

United Kingdom

• Political Studies Association, an academic association
• Professional Speaking Association
• Property Services Agency, a former UK government agency

United States

• Photographic Society of America
• Pi Sigma Alpha
• Poultry Science Association