| Abbreviation | Definition |
|---|---|
| APT | Athens Party Telephone |
| APTA | Association for the Promotion of Tourism to Africa |
| APTC | Atlantic Pacific Tea Company |
| APTC | Atlantic Physical Therapy Center |
| APTC | Authorized Prometric Testing Center |
| APTECH | Applied Pavement Technology, Inc. |
| APTG | American Pacific Technology Group |
| APTG | Asia Pacific Telecom Group |
| APTI | Accelerated Performance Technology International |
| APTI | Access Physical Therapy, Inc. |
| APTI | Advanced Power Technologies Inc. |
| APTI | Alaska Public Telecommunications, Inc |
| APTI | Applied Petroleum Technology, Inc. |
| APTL | Advanced Packaging Technology Labs |
| APTL | Andhra Pradesh Tanneries Ltd |
| APTL | Artech Power Trading Ltd |
| APTL | Automotive Production Technologies Ltd |
| APTM | Asian Pacific Timber Marketing |
| APTM | Asoka Putra Teknik Metalindo |
| APTMA | All Pakistan Textile Mills Association |