| Abbreviation | Definition |
|---|---|
| ASB | Alianza Socialista de Baleares |
| ASDC | Association of State Democratic Committees |
| ASEAN | Association of Southeast Asian Nations |
| ASPECT | Alliance for Social Political Ethical and Cultural Thought |
| ASPP | Association for Social and Political Philosophy |
| ASSR | Autonomous Soviet Socialist Republic |
| ASTAK | The Anti-Stalinist Action Normannenstraße |
| ASWG | Abortion Services Working Group |
| ATHL | At The Highest Level |
| ATI | Activist Times Incorporated |
| ATICM | Arab Telecommunications and Information Council of Ministers |
| ATR | After The Revolution |
| ATS | Automate The Schools |
| ATTF | All Tripura Tiger Force |
| AUD | Association for Union Democracy |
| AUDF | All India United Democratic Front |
| AUDF | Assam United Democratic Front |
| AUG | Arab United Group |
| AV | Alternative Vote |
| AWPC | Agearizona Womens Political Caucus |