| Abbreviation | Definition |
|---|---|
| ATC | Austrian Technology Corporation |
| ATC | Authorized Training Center |
| ATC | Authorized Training Centre |
| ATCI | Antenna Technology Communications Inc |
| ATCL | Air Tanzania Company Limited |
| ATCL | Air Tanzania Corporation Limited |
| ATCO | Advanced Techniques Corporation |
| ATCO | Arain Trading Corporation |
| ATCR | Accurate Translation Company - Rwanda |
| ATD | Apricot Trading And Distribution |
| ATDC | Assam Tourism Development Corporation |
| ATDL | Atlantica Tender Drilling Ltd |
| ATEC | Advanced Test Equipment Corporation |
| ATEL | Atlantic Transportation Equipment Ltd |
| ATF | American Type Founders |
| ATF | American Type Foundry |
| ATF | Australian Temporary Fencing |
| ATFA | American Telephone Fundraisers Association |
| ATFC | Atlantic Tooling and Fabricating Company |
| ATFI | Adirondack Technologies Furniture Inc |