| Acronym | Definition |
|---|
| APA | American Psychological Association |
| APA | American Psychiatric Association |
| APA | Automobile Protection Association (Canada) |
| APA | American Planning Association |
| APA | Administrative Procedure Act (US) |
| APA | Asian Pacific American |
| APA | American Philosophical Association |
| APA | Austria Presse Agentur (Austrian National News Agency) |
| APA | American Plywood Association (now the Engineered Wood Association) |
| APA | American Payroll Association |
| APA | Adirondack Park Agency (Ray Brook, NY) |
| APA | American Philological Association |
| APA | Allied Pilots Association |
| APA | Asia Pacific Arts |
| APA | Advertising Photographers of America |
| APA | Advance Pricing Agreement |
| APA | Alpha Phi Alpha (fraternity) |
| APA | American Poolplayers Association |
| APA | Asset Purchase Agreement (acquisitions) |
| APA | Australian Postgraduate Awards |
| APA | Association of Police Authorities |
| APA | Adapted Physical Activity |
| APA | American Polygraph Association |
| APA | Allied Professional Association |
| APA | Auto Port Aggregation |
| APA | Ambulatory Pediatric Association |
| APA | Alabama Pharmacy Association |
| APA | American Psychotherapy Association |
| APA | Asociación Psicoanalítica Argentina |
| APA | Associate in Premium Auditing (insurance) |
| APA | Alabama Press Association |
| APA | Amateur Press Association (amateur fantasy & science fiction writers group) |
| APA | All Points Addressable |
| APA | Audio Publishers Association |
| APA | American Pyrotechnics Association |
| APA | American Pharmaceutical Association (Washington, DC) |
| APA | Asphalt Pavement Alliance |
| APA | Auto Pixel Alignment |
| APA | Asociación de Padres de Alumnos (Spain) |
| APA | Antiphospholipid Antibody |
| APA | American Poultry Association |
| APA | Alkaline Phosphatase Activity |
| APA | Association Pour l'Autobiographie |
| APA | American Paralysis Association |
| APA | Amerindian Peoples Association |
| APA | Anglican Province of America |
| APA | American Protective Association |
| APA | America's Promise Alliance |
| APA | Amphibious Transport |
| APA | Aldosterone-Producing Adenoma |
| APA | Architectural Precast Association |
| APA | American Pilots Association |
| APA | Accredited Pension Administrator (National Institute of Pension Administrators) |
| APA | Adaptive Packet Assembly |
| APA | American Pulpwood Association |
| APA | ASEAN People's Assembly |
| APA | American Publishers Association |
| APA | Arithmetic Processing Accelerator |
| APA | Alaska Power Administration |
| APA | Alabama Psychological Association |
| APA | Asociación Paleontológica Argentina |
| APA | Academy for the Performing Arts |
| APA | Acolyte Protection Agency (WWF tag team) |
| APA | Arizona Planning Association |
| APA | Auditors of Public Accounts |
| APA | Association of Paediatric Anaesthetists |
| APA | ASEAN Ports Association |
| APA | Arkansas Pharmacists Association |
| APA | Assistant Political Agent (Pakistan) |
| APA | Academic Practice Assembly |
| APA | Amalgamated Printers Association |
| APA | Amputee Coalition of America |
| APA | Afghanistan Peace Association |
| APA | Aromatics Producers Association |
| APA | American Podiatry Association |
| APA | Automotive Press Association (Detroit, MI) |
| APA | Adolf and the Piss Artists (band) |
| APA | Aircraft Procurement, Army |
| APA | Adaptive Phased Array |
| APA | African Paddling Association (South Africa) |
| APA | Active Phased Array |
| APA | Agrupaciones de Productores Agrarios (Spain) |
| APA | Army pre-positioned afloat (US DoD) |
| APA | Allowance for Program Adjustment |
| APA | Adaptive Power Allocation |
| APA | antipolymer antibody (assay) |
| APA | Army Procurement Agency |
| APA | African Potato Association |
| APA | Air Pathway Analysis |
| APA | Agricultural Publishers Association |
| APA | Advanced Performance Algorithm |
| APA | Antagonist Perpetrated Aggression |
| APA | Aircraft Parking Area |
| APA | American Protestant Association |
| APA | American Pinzgauer Association (Cedar Hill, TN) |
| APA | American Physiotherapy Association |
| APA | Airline Pilot's Association |
| APA | Always Pounding Ass |
| APA | Annular Phased Array |
| APA | Appalachian Pagan Alliance |
| ApA | Application Portfolio Architecture |
| APA | Appropriation Purchase Account |
| APA | American Philatelic Association |
| APA | Americanist Phonetic Alphabet |
| APA | Acid Precipitation Act |
| APA | Advanced Profit Analysis (analysis of production data for determining rate per minute of profitability) |
| APA | Accurate Premium Audits, Inc. |
| APA | Amplified Piezoelectric Actuator (Cedrat Technologies, France) |
| APA | Army Procurement Appropriations |
| APA | Air Patrol Area |
| APA | Association for the Prevention of Accidents (UK) |
| APA | Alien Port Adapter (Cisco 7200 router) |
| APA | American Parquet Association, Inc. |
| APA | American Particleboard Association |
| APA | Air Products Association |
| APA | American Pancreatic Association, Inc. |
| APA | Allowance for Project Adjustment |
| APA | Approvisionneur Professionnel Agree |
| APA | Advanced Processor Assembly |
| APA | Anti-Penguin Association |
| APA | Avionics Planning Activity |
| APA | Arrival-Point Analysis |
| APA | American Penguins Association (gaming clan) |
| APA | Asociación de Protección a las Adolescentes (Association for Protection of Adolescents, Guatemala) |
| APA | Air Preprocessing/Preamplifier Assembly |
| APA | Airborne Power Adapter |
| APA | Advanced Pilot's Aid |
| APA | Army Propositioned Afloat |
| APA | Antenna Pointing Angles |
| APA | Advance Procurement Authorization |
| APA | Azimuth Power Assembly |
| APA | Advance of Pay & Allowances |
| APA | Adiabatic Perturbation Approximation |
| APA | Accident Prevention Advisor (Airline) |
| APA | Assistant Planner Analyst |
| APA | After Print Approval (metals industry) |