| AAR | Association of American Railroads, Asociácia amerických železničných spoločností (angl.skr.) |
|---|---|
| ABA | Australian Broadcasting Authority |
| ABC | American Broadcasting Company, americká rozhlasová a televízna spoločnosť, televízna stanica v USA |
| ABC | Australian Broadcasting Commission |
| ABN | African Broadcasting Network |
| ABN | Alarm Broadband Network |
| ABS | Army Broadcasting Service |
| ARSI | Automated Roadside Safety Inspection |
| ASSOS | mesto v starovekej Troade |
| BSA | Broad Spectrum Antibiotics |