| 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) |