| Acronym | Definition |
|---|
| ATL | Atlanta, GA, USA - Hartsfield International (Airport Code) |
| ATL | Atlantic |
| ATL | Atlanta Thrashers (NHL hockey) |
| ATL | Association of Teachers and Lecturers (UK) |
| ATL | Active Template Library |
| ATL | Above the Law (gaming clan; rap group; blog) |
| ATL | Ann Taylor Loft |
| ATL | All Time Low (band) |
| ATL | Adult T-cell Leukemia |
| ATL | Above The Line (advertising) |
| ATL | Hartsfield International Airport (Atlanta, Georgia) |
| ATL | Advanced Technology Labs (Sprint) |
| ATL | Advanced Tactical Laser |
| ATL | Automated Tape Library |
| ATL | Approach To Learning (educational term) |
| ATL | Americans for Technology Leadership |
| ATL | ATLAS Transformation Language |
| ATL | Algar Telecom Leste (cellular operator, Brazil) |
| ATL | Attempt to Locate (police) |
| ATL | A Tu Lado (Spanish TV program) |
| ATL | Assistant Team Leader |
| ATL | Abgasturbolader (German: turbocharger) |
| ATL | Almost Too Late |
| ATL | Automatic Tape Library |
| ATL | Actual Total Loss |
| ATL | Assistive Technology Lab |
| ATL | Alternate Timeline |
| ATL | Adaptive Threshold Learning |
| ATL | Academy for Teaching and Learning |
| ATL | Audit Team Leader |
| ATL | Artificial Transmission Line |
| ATL | Accelerated Trade Liberalization (World Trade Organization) |
| ATL | Aviation Traders Limited |
| ATL | Adaptive Technologies Limited (Brighton & Hove, East Sussex, UK) |
| ATL | Archer Technicoat Ltd (High Wycombe, UK) |
| ATL | Aerosol Technology Laboratory (Autonomous Research Laboratory at Texas A&M University; College Station, Texas) |
| ATL | Accenture Technology Lab |
| ATL | Acronimo de Tres Letras (Spanish: Three Letter Acronym) |
| ATL | Acquisitions, Logistics, and Technology |
| ATL | Aircraft Technical Library |
| ATL | ActiveX Library Template (Microsoft) |
| ATL | Adjustable Travel Limiter |
| ATL | Automated Tax Law |
| ATL | Automated Test Library |
| ATL | Accumulated Time of Leave (Australia) |
| ATL | ADSL Transmission Line |
| ATL | Account Technical Lead |
| ATL | ATWCS Training Laboratory |
| ATL | Angle Technology Ltd (UK) |