| Acronym | Definition |
|---|
| APSA | American Political Science Association |
| APSA | African Peace and Security Architecture (African Union) |
| APSA | Airline Pilots' Security Alliance |
| APSA | American Pediatric Surgical Association |
| APSA | Asia Pacific Screen Academy (Australia) |
| APSA | Arizona Private School Association (Phoenix, AZ) |
| APSA | Advanced Photovoltaic Solar Array |
| APSA | Asia and Pacific Seed Association |
| APSA | Above Ground Petroleum Storage Act (California) |
| APSA | ASEAN Petroleum Security Agreement |
| APSA | American Planning Student Association (California) |
| APSA | Asian Pacific Student Association |
| APSA | A Production Sharing Agreement (resource contract) |
| APSA | Australian Peak Shippers Association |
| APSA | Asian Pacific Student Alliance |
| APSA | Automotive Parts & Services Association (Austin, TX) |
| APSA | Automotive Parts and Service Alliance (formerly Automotive Aftermarket Industry Association and the Automotive Warehouse Distributors Association) |
| APSA | Aerospace Professional Staff Association |
| APSA | Adult Protective Services Act |
| APSA | American Polypay Sheep Association |
| APSA | Ammunition Procurement Supply Agency |
| APSA | Analysis of Product Support Alternatives (US Army) |
| APSA | Animal Protection Society Albox (Almería, Spain) |
| APSA | Aceros Prefabricados Sociedad Anónima (Spanish, Guatemala) |
| APSA | Australian Professional Selling Association |