| Acronym | Definition |
|---|
| ATTC | American Type Culture Collection (biological product contract; University of Pennsylvania) |
| ATTC | Addiction Technology Transfer Center (Kansas City, MO) |
| ATTC | Aviation Technical Test Center |
| ATTC | Advanced Television Test Center |
| ATTC | Aviation Technical Training Center |
| ATTC | Austrian Traffic Telematics Cluster |
| ATTC | Aboriginal Tourism Team Canada (now Aboriginal Tourism Canada) |
| ATTC | ASEAN Timber Technology Centre |
| ATTC | Automatic Transmission Test and Control Circuit |
| ATTC | Advanced Television Technology Center, Inc. |
| ATTC | American Telephone and Telegraph Communications |
| ATTC | Advanced Technology Transition Council |
| ATTC | Arabic Teacher Training Course (Allama Iqbal Open University; Pakistan) |