| #SC | Southern California | |
| +94 | country code denoting Sri Lanka | |
| +977 | code denoting Nepal | |
| 00 | Emergency/Maximum Priority (Birmingham, AL Radio Code) | |
| 223 | East-West US 223 (not an acronym) | |
| 23412 | 234FUCKYOU | |
| 3 E’S | (Of Sustainability) Environmental Ethical Economic | |
| 3RP | Regional, Resilience and Response Plan | |
| 4C | Four Corners (AZ, CO, NM, UT) | |
| 68212 | Postal code for Moernach, France | |
| A | Artificial | |
| AA | Aquele Abraco | |
| AAAI | Advertising Agencies Association of India | |
| AABS | African American Bold Savor | |
| AAD | Australian Antarctic Division | |
| AADP | Association of Applying and Developing Pharmacy | |
| AAFA | Association of Accountants, Financial Workers and Auditors | |
| AAG | Galatasaray Sports Club | |
| AAGS | Asia Association for Global Studies | |
| AAIP | Afghanistan Agricultural Inputs Project | |
| AAOI | Architects’ Alliance of Ireland | |
| AARL | Addis Ababa Regional Laboratory | |
| AARM | ASEAN Armies Rifle Meet | |
| AASDA | Asante Akim South District Assembly | |
| AASF | Alcoholics Anonymous San Francisco |
| AATWIN | Alliance Against Trafficking of Women and girls In Nepal | |
| AAUF | African American United Fund | |
| AAY | Antyodaya Anna Yojana | |
| ABERD | Aberdeen (Scotland) | |
| ABRHS | Acton-Boxborough Regional High School | |
| ABRSD | Acton-Boxborough Regional School District | |
| ABSG | Abia State Government | |
| ACAA | Afghan Civil Aviation Authority | |
| ACBAR | Agency Coordinating Body for Afghan Relief & Development | |
| ACE | African, Caribbean, and European | |
| ACE | American, Canadian, and English | |
| ACGRC | Analytical Center on Globalization and Regional Cooperation | |
| ACGRC | Analytical Centre on Globalisation and Regional Cooperation | |
| ACGRC | Analytical Centre on Globalization and Regional Cooperation | |
| ACME | Advisory Committee on Mathematics Education | |
| ACP | African, Caribbean, and Pacific | |
| ACRC | Alta California Regional Center | |
| ACRC | Alta California Regional Center’s | |
| ACRD | Alberni Clayoquot Regional District | |
| ACRD | Alberni-Clayoquot Regional District | |
| ACRF | Atlantic Coast Regional Fund | |
| ACRJ | Albemarle Charlottesville Regional Jail | |
| ACRONYM | Anti-Cronyism Movement | |
| ACRSS | Archbishop Carney Regional Secondary School | |
| ACRTA | Allen County Regional Transport Authority |
| ACRTA | Allen County Regional Transportation Authority | |
| ACSUS | Association for Canadian Studies in the United States | |
| ACTA | Afghan Coalition for Transparency and Accountability | |
| ACTD | Afghanistan Center for Trainings and Development | |
| ADFN | Akaitcho Dene First Nations | |
| ADSG | Adamawa State Government | |
| AE | Almost European | |
| AE-AJ | ‘Ajmān, United Arab Emirates | |
| AE-AZ | Abū Z̧aby, United Arab Emirates | |
| AE-DU | Dubayy, United Arab Emirates | |
| AE-FU | Al Fujayrah, United Arab Emirates | |
| AE-RK | Ra’s al Khaymah, United Arab Emirates | |
| AE-SH | Ash Shāriqah, United Arab Emirates | |
| AE-UQ | Umm al Qaywayn, United Arab Emirates | |
| AEELS | Association of English Education and Literature Students | |
| AEP | Asia, Europe, Pacific | |
| AFDI | Annual Foreign Direct Investment | |
| AFPAK | Afghanistan-Pakistan | |
| AFRSAF | Asia-Pacific Regional Space Agency Forum | |
| AFTA | Asean Free Trade Area | |
| AG | Arabian Gulf | |
| AGREA | Analysis Group for Regional Energy Alternatives | |
| AGS | Austria, Germany, and Switzerland | |
| AHIC | Almaguin Highlands Information Centre | |
| AIHRC | Afghanistan Independent Human Rights Commission |
