| Abbreviation | Definition |
|---|---|
| ATA | Alternatives To Aggression |
| ATAC | American Teens Against Crime |
| ATAK | Android Tactical Assault Kit |
| ATC | Addicted To Coke |
| ATC | Australian Tax Cases |
| ATCA | Alien Tort Claims Act |
| ATCI | Advanced Traffic Crash Investigation |
| ATCL | Accounting Tax Corporate Legal |
| ATCU | Anti Transnational Crime Unit |
| ATDC | Adult Treatment Drug Court |
| ATEU | Automated Traffic Enforcement Unit |
| ATJ | Access to Justice |
| ATJF | Access to Justice Foundation |
| ATJF | Access to Justice Fund |
| ATL | Above Tha Law |
| ATL | Antitrust Law |
| ATLA | American Trial Lawyers Assoc |
| ATLA | American Trial Lawyers Association |
| ATLAS | Access To Legal Aid Services |
| ATM | All Time Murder |