| AAPA | American Association of Port Authorities, Americké združenie prístavných úradov (angl.skr.) |
|---|---|
| ABA | Australian Broadcasting Authority |
| ADS | Authoritative Data Sources |
| AEA | Atomic Energy Authority (skr.) |
| APOLLO | postava v komikse The Authority od Wildstorm Comics |
| BSA | Broadcasting Standards Authority |
| BSA | Building Services Authority |
| CASA | Civil Aviation Safety Authority |
| CPA | Coalition Provisional Authority |
| EPA | Environment Protection Authority |