PSA is a three letter acronym which may stand for:

• Pacific Sociological Association
• Pacific Southwest Airlines, a former U.S. airline that used to fly passenger services inside California and to other nearby Western areas during the 1970s and early 1980s; its trademark was a smile drawn under their planes' cockpits
• Paralysis Society of America, a group whose activity is based on The Paralyzed Veterans Of America except supporting civilians
• Persistent sexual arousal syndrome
• Pharmaceutical Society of Australia
• Philosophy of Science Association
• Potentiometric Stripping Analysis
• Premier Soccer Alliance, the original name of the World Indoor Soccer League
• Pressure-sensitive adhesive
• Probabalistic Safety Assessment
• Product and Service Agreement
• Production Services Association, a union in the United Kingdom
• professional services automation
• Professional Sports Authenticator
• Professional Squash Association, the operator of the Men's Professional Game of Squash
• Prostate-specific antigen, a substance that can be detected in the blood of men and which helps to determine if there may be a prostate cancer
• PSA Airlines a subsidiary of US Airways Group
• PSA International, a port operator based in Singapore; it is also an abbreviation for the now defunct Port of Singapore Authority
• PSA Peugeot Citroën (originally from 'Peugeot Société Anonyme'), a French company which manufactures Peugeot and Citroën cars
• Public Schools Association
• Public Securities Association
• Public service announcement
• Public Service Association, a large union for workers in the public sector of New Zealand
• Public Servants Association of South Africa
• Pressure Swing Absorption: a special method for purifying gases (there is a very good presentation on UOP home page)
• PSA, the planned title of the song and single Bad Day by R.E.M.
• Purse Snatchers Association, a large gang specialized in organized crime in Birmingham, UK. There are other variations of the name however are of no significant notability.
• Photographic Society of America, a transnational organization promoting amateur photography and based in Oklahoma City, OK, USA

• Prefixed Save Area, which is often referred to as "Low Core". The PSA is a common area of virtual storage from address zero through 8191 in every address space. There is one unique PSA for every processor installed in a system. The PSA maps architecturally fixed hardware and software storage locations for the processor. Because there is a unique PSA for each processor, from the view of a program running on z/OS, the contents of the PSA can change any time the program is dispatched on a different processor. This feature is unique to the PSA area and is accomplished through a unique DAT manipulation technique called prefixing.

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