ATL

ATL may refer to:

Places

Atlanta, the capital and most populous city of the U.S. state of Georgia
- Hartsfield–Jackson Atlanta International Airport (IATA airport code)
- Peachtree station (Amtrak station code)
Attleborough railway station, in Norfolk, England (National Rail code)

Advanced Tactical Laser, a US military program to mount a laser weapon on an aircraft for use against ground targets
Americans for Technology Leadership, an organization that advocates limited government regulation of technology
Active Template Library, from Microsoft
ATLAS Transformation Language, a QVT model transformation language for model-driven engineering
A retired US Navy hull classification symbol: Atlantic tank landing ship (ATL)

Adult T-cell leukemia, a rare cancer of the immune system's own T-cells
Air Atlantic, ICAO code ATL
Alternating-time Temporal Logic, a branching-time temporal logic that naturally describes computations of multi-agent system and multiplayer games
ATL (Amperex Technology Limited), a Chinese battery manufacturing company
Anti-Terrorism Law, a law that aims to prevent, prohibit, and penalize terrorism in the Philippines
The Appropriate Technology Library, a library on 29 subject areas of small scale, do-it-yourself technology
Association of Teachers and Lecturers, an education union in the UK
Atlanta, Georgia's major professional sports teams:
- Atlanta Braves, the city's Major League Baseball team
- Atlanta Falcons, the city's National Football League team
- Atlanta Hawks, the city's National Basketball Association team
- Atlanta United FC, a Major League Soccer team
Avion Très Léger or Robin ATL, a light aircraft manufactured by Avions Pierre Robin
The ATL proposed rebrand of Metropolitan Atlanta Rapid Transit Authority (MARTA)
Azienda Trasporti Livornese, former Livorno bus transport company