| AACO | AIDS Activities Coordinating Office |
|---|---|
| AAS | Australian Accounting Standard |
| AAT | Association of Accounting Technicians |
| ABA | Australian Broadcasting Authority |
| ABC | Agent Based Computing |
| ABC | American Broadcasting Company, americká rozhlasová a televízna spoločnosť, televízna stanica v USA |
| ABC | Australian Broadcasting Commission |
| ABN | African Broadcasting Network |
| ABP | Alternating Bit Protocol |
| ABS | Army Broadcasting Service |