| AARC |
Aruba Amateur Radio Club 
|
| AARC |
Accra Amateur Radio Club |
| AATiS |
Arbeitskreis Amateurfunk und Telekommunikation in der Schule
|
| AAW |
Antarctic Activity Week |
| AB |
All Band (Contest) |
| ABC |
Australian Broadcasting Corporation |
| ACG |
Alabama Contest Group |
| ACMA |
Australian Communications and Media Authority |
| ADIF |
Amateur Data Interchange Format |
ADL
|
Austrian District Locator |
| Admiralty |
Admiralty List of Lights and Fog Signals |
| ADXB |
Austrian DX Board
|
| AFVL |
Amateur Funk Verein Liechtenstein
|
| AGCW |
Arbeitsgemeinschaft Telegraphie
|
| AGDX |
Arabian Gulf DX group |
| ALARA |
Australian Ladies Amateur Radio Association
|
| AMISOM |
African Union Mission in Somalia |
| AMRA |
Association Mosellane des Radio Amateurs
|
AMRS
|
Austrian Military Radio Society
|
| AMSAT |
Radio Amateur Satellite Corporation |
| ANARE |
Australian National Antarctic Research Expeditions |
| ANZAC |
Australian and New Zealand Army Corps |
AOTA
|
Airfields on the Air |
| ARA |
Amateurs Radio Algeriens
|
| ARAF |
Associação dos Radioamadores de Florianopolis |
| ARAL |
Almaty Amateur Radio League |
| ARAM |
Associação de Radioamadores do Alto Minho |
| ARARM |
Asociacion de Radio Aficionados de la Republica Mexicana
|
| ARAT |
Association des Radio Amateurs Tunisiens |
| ARBA |
Associação de Radioamadores da Beira Alta |
| ARBB |
Associação de Radioamadores da Beira Baixa |
| ARC |
Associação Radioamadores de Coimbra |
| ARDF |
Amateur Radio Direction Finding |
| AREG |
Amateur Radio Experimenters Group |
| ARES |
Amateur Radio Emergency Service |
| ARFI |
Associazione Radioamatori Finanzieri Italiani |
| A.R.I. |
Associazione Radioamatori Italiani
|
| ARISS |
Amateur Radio on the International Space Station
|
| ARL |
Almaty Radio Amateur League |
| ARLHS |
Amateur Radio Lighthouse Society
|
| ARM |
Amateur Radio Society of Moldova |
| ARMI |
Associazione Radioamatori Marinai Italiani
|
| ARRAM |
Association Royale des Radio Amateurs du Maroc
|
| ARRL |
Amateur Radio Relay League
|
| ARSATC |
Amateur Radio Satellite Community |
| ART |
Amateur Radio Taipei |
| ARU |
Algerian Radio Amateur Union |
| ATNO |
All Time New One |
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