| Acronym | Definition |
|---|
| APT | Apartment |
| APT | Airport |
| APT | American Public Television |
| APT | Aptitude |
| APT | Advanced Package Tool (Linux) |
| APT | Action for Public Transport (Australia) |
| APT | Advanced Persistent Threat (intelligence security) |
| APT | Appellant |
| APT | Auburn Public Theater (Auburn, NY) |
| APT | Australian Pacific Touring (est. 1927) |
| APT | Association for the Prevention of Torture |
| APT | Atom-Probe Tomography |
| APT | Advanced Passenger Train |
| APT | Arbitrage Pricing Theory |
| APT | Association for Preservation Technology |
| APT | Abuse Prevention Training (various organizations) |
| APT | Association for Political Theory (est. 2000) |
| APT | Artist Pension Trust |
| APT | Access to Professional Training (disabilities) |
| APT | Asia-Pacific Telecommunity |
| APT | Advances in Psychiatric Treatment |
| APT | Aquatic Physical Therapy |
| APT | Alabama Public Television |
| APT | Automatically Programmed Tools |
| APT | Advanced Package Tool |
| APT | Analog Proprietary Telephone |
| APT | Application Process Title |
| APT | Advanced Printing Technology |
| APT | Application Programmer'S Toolkit |
| APT | Annotation Processing Tool |
| APT | Adjustable Power Trip |
| APT | Azienda Promozione Turistica (Italian: Tourist Promotion Company) |
| APT | Advanced Power Technology (Richardson Electronics) |
| APT | Alliance for Public Technology |
| APT | Automatic Picture Transmission |
| APT | Ammonium Paratungstate (tungsten refining) |
| APT | ASEAN Plus Three |
| APT | Asset Protection Trust |
| APT | Alliance of Professional Tattooists |
| APT | Autorisation Provisoire de Travail (French: Temporary Work Permit) |
| APT | Advanced Positioning Technology (various companies) |
| APT | Andhra Pradesh Technology (India) |
| APT | Accredited Permaculture Training (Australia) |
| APT | Attached Proton Test (chemistry) |
| APT | Association of Polysomnographic Technologists |
| APT | Academic Part Time |
| APT | Automated Performance Testing (computing) |
| APT | Accelerator Production of Tritium |
| APT | Automatically Programmed Tool |
| APT | Administrative, Professional and Technical (staff) |
| APT | Address Pass Through |
| APT | Advanced Platform Technology |
| APT | Administrative Payment Team (various agencies) |
| APT | Automated Pit Trading |
| APT | Accelerated Pavement Test |
| APT | Apartamiento (apartment; postcode use, Puerto Rico) |
| APT | American Players Theater (Spring Green, WI) |
| APT | Applied Potential Tomography |
| APT | Accelerated Part-Time (education; various schools) |
| APT | Automatic Public Toilet |
| APT | Automatic Photometric Telescope |
| APT | Attention Processing Training (cognitive rehabilitation) |
| APT | Advanced Photoscale Technology (Brother) |
| APT | Accounting Production Transfers (oil & gas) |
| APT | Accelerated Planning Technique |
| APT | Aircrew Procedures Trainer |
| APT | Alliance for Photonic Technology |
| APT | Amide Proton Transfer |
| APT | A Practical Transit-Mapping Service |
| APT | Association of Pensioneer Trustees |
| APT | Anesthesiology Pharmacology Therapeutics (medical field) |
| APT | Aquaculture Production Technology, Ltd (Israel) |
| APT | Atomic Polar Tensor |
| APT | Acquisition Pointing and Tracking |
| APT | Awesome Piece Theatre (gaming) |
| APT | Association for Public Transportation, Inc |
| APT | Advanced Pirate Technology |
| APT | Advanced Plume Treatment |
| APT | Arranged Passenger Transport |
| APT | Analytic Perturbation Theory |
| APT | Automatic Programming of Tools |
| APT | Alliance for Productive Technology (insurance, SEMCI) |
| APT | Application Productivity Tool |
| APT | Advanced Personnel Testing |
| APT | Air Passenger Tariff |
| APT | Association of Professional Tattooists |
| APT | American Pneumatic Tool, Inc. (Gardena, California) |
| APT | Asia Pacific Transport Pty Ltd (Australian rail-building consortium) |
| APT | Air Passenger Terminal |
| APT | Advanced Predictive Technology |
| APT | Active Process Table |
| APT | Associated Pharmacists and Toxicologists |
| APT | Awaiting Pilot Training (US Air Force) |
| APT | American Phone Terrorists |
| APT | Advanced Power Technologies Center (multi-university consortium) |
| APT | Adaptive Phase Tracking |
| APT | Automatic Program Tool |
| APT | American Portable Telecommunications |
| APT | AT&T Pre-Paid Technology (pre-paid long distance, wireless, etc) |
| APT | Antarctic Passenger Terminal (New Zealand) |
| APT | All-Purpose Tire |
| APT | Augmented Programming Training |
| APT | Annular Proton Telescope |
| APT | Active Pulse Train |
| APT | Academy for Power & Transportation |
| APT | Aspirin Provocation Test |
| APT | Automatic Picture Test |
| APT | Annual Planning Table |
| APT | Adaptive Polling Technique |
| APT | Automatic Progression Trunk |
| APT | Advanced Passive Technology (BMDO) |
| APT | Aunis Poker Tour (France) |
| APT | All-Purpose Terminal |
| APT | Advanced Personnel Training |
| APT | All Purpose Tape |
| APT | Automatic Parameter Test |
| APT | Airborne Pointing & Tracking |
| APT | Automatic Planning and Technology |
| APT | Acoustic Proficiency Trainer |
| APT | Alumprecipitated Toxoid |
| APT | Accident Prevention Team |