| Acronym | Definition |
|---|
| ATSI➣Aboriginal and Torres Strait Islander (Australia) |
| ATSI➣Association of TeleServices International |
| ATSI➣American Technology Solutions International |
| ATSI➣Advanced Technology Solutions, Inc. |
| ATSI➣Advanced Technology Services, Inc. (Arizona) |
| ATSI➣Association of Thai Software Industry |
| ATSI➣American Transmission Systems, Inc. |
| ATSI➣Anderson Trucking Service, Inc. (various locations) |
| ATSI➣Association of Telemessaging Services International |
| ATSI➣Asosiasi Telekomunikasi Seluler Indonesia (Association of Indonesian Cellular Operators) |
| ATSI➣Alias TETRA (Terrestrial Trunked Radio) Subscriber Identity (telecommunications) |
| ATSI➣Aero Transcription Service, Inc. (Baltimore, MD) |
| ATSI➣Arcus Technology Services Inc |