ATCL
| Acronym | Definition |
|---|---|
| ATCL | Associate of Trinity College London |
| ATCL | Automobile et Touring Club du Liban (French: Automobile and Touring Club of Lebanon) |
| ATCL | Appeals Team Case Leader (US IRS) |
| ATCL | Adult T-Cell Leukemia (illness) |
| ATCL | Automatic Transfer Control Logic (electric power system) |
| ATCL | Air Traffic Control Line |
| ATCL | Air Traffic Controller License (various countries) |
| ATCL | Association for Teacher-Librarianship (Canada) |