| AAP | Alternate Access Provider |
|---|---|
| AAS | Alternate Architecture Study |
| ABC | Alternative Birth Center |
| ABP | Alternating Bit Protocol |
| ABS | Alternative Bank Schweiz, švajčiarska banka so sídlom v Oltene |
| ABS | Alternative Billing Service |
| AC | alternating current (skr.), striedavý prúd (angl.skr.) |
| ACI | alliance Cooperative Internationale (skr.) |
| ACT | Alternative Control Technology |
| ADA | Alternative Distribution Alliance |