- Personalized Amplification System™ family of products
- Process Automation System
- Patient Administration System
- Partido Alianza Social , a former Mexican political party.
- PAS (political Party) (''Parti Islam SeMalaysia'' or Islamic Party of Malaysia), a Malaysian political party
- Periodic Acid-Schiff reaction, a Staining method for Carbohydrate s in Light Microscopy .
- Proceedings Of The Aristotelian Society , a philosophical journal.
- ''para''-aminosalicylic Acid , an old treatment for Tuberculosis
- paraaortic (or para-aortic) Splanchnopleura
- Personal Access System wireless telephone standard
- Pas Ioannina , a Greek football club
- FC Pas Tehran , an Iranian football club
- Parental Alienation Syndrome
- Physician-assisted Suicide
- Percussive Arts Society
- Pioneer Academy Of Science
- Polish Academy Of Sciences
- Post-abortion Syndrome
- Pump Action Shotgun
- PepsiAmericas
- Power Assisted Steering in automobiles.
- Priorities Action Statement , a strategic plan for recovery of threatened species in NSW, Australia
- Polyarylsulfone, a Thermoplastic
- A common file extension (.pas) for the Pascal Programming Language
- PAS peripheral anterior synechiae (ophthalmology term)
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