| อักษรย่อ | คำเต็ม | รายละเอียด |
| A /C | Air Conditioner / -ing | |
| A-X | ASEAN Minus X | |
| A.C | account | |
| A.M. | Ante Meridiem | |
| a.o.b. | any other business | |
| a.s.a.p | as soon as possible | |
| A/C | account | |
| A/C No. | account number | |
| AAC | Advanced Audio CODEC | |
| AADCP | ASEAN-Australia Development Cooperation Programme | |
| AAF | ASEAN-Australia Forum | |
| AASROC | Asian-African Sub-Regional Organizations Conference | |
| AATCC | American Association Of Textile Chemists And Colorists | |
| ABAC | APEC Business Advisory Council | |
| ABC | Australian Broadcasting Corporation | |
| Abd | Abdomen | |
| ABS | Antilock Braking System หรือ Acrylonitrile Butadiene Styrene | |
| ABTC | APEC Business Travel Card | |
| ACB | ASEAN Committee in Beijing | |
| ACBC | ASEAN-Canada Business Council | |
| ACCSM | ASEAN Conference on Civil Service Matters | |
| ACCSQ | ASEAN Consultative Committee on Standards and Quality | |
| ACE | ASEAN Centre for Energy | |
| ACF | ASEAN Cultural Fund | |
| ACL | Asia Credit Public Company Limited | |
| ACMECS | Ayeyawady - Chao Phraya - Mekong Economic Cooperation Strategy | |
| Ad. | Advertisements | |
| ADB | Asian Development Bank | |
| ADF | ASEAN Development Fund | |
| ADMI | Advanced Data Mining International | |
| admin. | administration | |
| ADPC | Asian Development Preparedness Center | |
| Ads. | Advertisements | |
| ADSL | Asymmetric Digital Subscribers Line | |
| AE | Acute exaerbation | |
| AEC | ASEAN Economic Community | |
| AECC | ASEAN Economic Community Council | |
| AEGDM | ASEAN Experts Group on Disaster Management | |
| AEM | ASEAN Economic Ministers Meeting | |
| AF | Atrial Fibrillation | |
| AFTA Council | ASEAN Free Trade Area Council | |
| Agcy. | Agency | |
| AGE | Acute Gastroenteritis | |
| AGM | Annual General Meeting | |
| AHIA | ASEAN Heads of Investment Agencies | |
| AIA | ASEAN Investment Area | |
| AICO | ASEAN Industrial Cooperation Scheme | |
| AIDS | Acquired Immunodeficiency Syndrome | |
| AIPO | ASEAN Inter-Parliamentary Organization | |
| ALS | Amyotrophic Lateral Sclerosis | |
| AMAF | ASEAN Ministerial Meeting on Agriculture and Forestry | |
| AMBDC | ASEAN-Mekong Basin Development Cooperation | |
| AMD | Advanced Micro Devices, Inc. | |
| AMEM | ASEAN Ministers on Energy Meeting | |
| AMI | Acute Myocardial Infarction | |
| AMM | ASEAN Ministerial Meeting | |
| AMME | ASEAN Ministerial Meeting on the Environment | |
| AMMH | ASEAN Ministerial Meeting on Haze | |
| AMMRDPE | ASEAN Ministers Meeting on Rural Development and Poverty Eradication | |
| AMMST | ASEAN Ministerial Meeting on Science and Technology | |
| AMMTC | ASEAN Ministerial Meeting on Transnational Crime | |
| ANC | Ante natal care | |
| Ans. | Answer | |
| AOL | American Online, Inc. | |
| AOT | Airports of Thailand Public Company Limited | |
| AP | Associated Press | |
| APEC | Asia-Pacific Economic Cooperation | |
| APHA | American Public Health Association | |
| API | Application Programming Interface | |
| Apps. | Applications | |
| Apr. | April | |
| ARF | Acute Renal Failure | |
| ASAP | As Soon As Possilbe | |
| ASEAN | Asian-Pacific Economic Cooperation | |
| ASEM | Asia Europe Meeting | |
| ASL | Age/ Sex/ Location | |
| assoc. | association | |
| Asst. | Assistant | |
| Asst. / Assist. | Assistant | |
| ASTM | American Society for Testing and Materials | |
| ATDP | The Association of Thai Textile Bleaching Dyeing Printing and Finishing Industries | |
| ATM | At the moment | |
| ATN | Acute Tubular Necrosis | |
| ATP | Association of Tennis Professionals | |
| Attn. | For the attention of | |
| Aug. | August | |
| Ave | Avenue | |
| Ave. | Avenue | |
| AVI | Audio Video Interleave | |
| AWS | Alcohol Withdrawal score | |
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