- Atlanta, Georgia , United States
- --- Hartsfield-Jackson Atlanta International Airport (IATA airport code: ATL)
- --- '' ATL '', a 2006 film set in the city
- ATLAS Transformation Language , a QVT model transformation language for Model Driven Engineering
- Across The Line , a radio programme
- Active Template Library , from Microsoft
- Aero Tec Labs company
- Advanced Tactical Laser
- Algar Telecom Leste
- Alternating Time Temporal Logic
- Americans For Technology Leadership , a coalition of technology professionals, companies and organizations that advocates limited government regulation of technology.
- Association Of Teachers And Lecturers , a teachers' union in the UK
- ATL (boy Band)
- Attleborough Railway Station , its National Rail code
- Azienda Trasporti Livornese
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