| ATPA | Addiction Treatment Providers Association 
| Others |
| ATPA | Adolescent To Parent Abuse
| Others |
| ATPA | Alabama Transportation Planners Association
| Others |
| ATPA | Alberta Tractor Pullers Association
| Others |
| ATPA | American Technology Pre-eminence Act of 1991
| Others |
| ATPA | American Tractor Pullers Association
| Others |
| ATPA | Andean Trade Preference Act
| Others |
| ATPA | Arkansas Timber Producers Association
| Others |
| ATPA | Associated Third Party Administrators
| Others |
| ATPA | Australian Tractor Pullers Association
| Others |
| ATPA | Automobile Theft Prevention Authority
| Others |
| ATPA | Automobile Theft Protection Authority
| Others |
| ATPA | Automotive Technology Partnership Academy
| Others |