ATL
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ATL may stand for:
- Microsoft's Active Template Library
- Aero Tec Labs company
- Algar Telecom Leste
- Association of Teachers and Lecturers, a teachers' union in the UK
- the city of Atlanta, Georgia, USA
- the IATA airport code for Atlanta's Hartsfield-Jackson Atlanta International Airport
- Azienda Trasporti Livornese
- Alternating time Temporal Logic
- Meanings and uses related to the phrase "Above the line".
- Above the line film costs/expenditures
- Above the line advertising techniques
- In contract bridge "bonus" points that don't count toward the 100 points needed to win the game are recorded "above the line".
ATL is also the name of a boy band (see ATL (boy band)).