| ATTC | Accounting Training and Testing Center 
| Others |
| ATTC | Addiction Technology Transfer Center
| Others |
| ATTC | Addiction Technology Transfer Centers
| Others |
| ATTC | Adolescent Trauma Training Center
| Others |
| ATTC | Advanced Teachers' Training Course
| Others |
| ATTC | Advanced Technology Training Center
| Others |
| ATTC | Advanced Transportation Technology Center
| Others |
| ATTC | Alameda Table Tennis Club
| Others |
| ATTC | All Terain Tracked Carrier
| Others |
| ATTC | All Terrain Tracked Carrier
| Others |
| ATTC | American Torch Tip Company
| Others |
| ATTC | American Tug and Transit Company
| Others |
| ATTC | American Type Culture Collection [microbiology]
| Others |
| ATTC | Arabic Teacher Training Course
| Others |
| ATTC | Arizona Traffic Ticket and Complaint
| Others |
| ATTC | Assistive Technology Training Center
| Others |
| ATTC | Associated Truck and Trailer Company
| Others |
| ATTC | Auto Table To Chart
| Others |
| ATTC | Automatic Transmission Test and Control Circuit
| Others |
| ATTC | Aviation Technical Test Center
| Others |
| ATTC | Aviation Technical Training Center
| Others |