| Abbreviation | Definition |
|---|---|
| ASR | American Sociological Review |
| AST | A Short Tale |
| ASW | American Skating World |
| AT&T | American Telephone and Telegraph Company |
| ATA | Also Translated As |
| ATC | American TV and Communications |
| ATF | All Things Forgotten |
| ATF | All Time Favorite |
| ATHF | Aqua Teen Hunger Force |
| ATM | Aakash Times Magazine |
| ATO | Are They On? |
| ATSC | Advanced Television Systems Committee |
| ATT | Alabama Technology Today |
| ATTK | A Time to Kill |
| ATU | Automated Transmission Unit |
| ATZ | ADVO Targeting Zone |
| AU | Annotation Unit |
| AuBC | Australian Broadcasting Corporation |
| AuBD | Aurelia Bold font type |
| AUBK | Audio Book |