| Abbreviation | Definition |
|---|---|
| ACG | Association Canadienne du Gaz |
| ACG | Canadian Academy of Engineering |
| ACG | Canadian Association of Gastroenterology |
| ACG | Canadian Association of Geographers |
| ACG | Canadian Gas Association |
| ACGS | Alachua County Genealogical Society |
| ACGS | Alcorn County Genealogical Society |
| ACGS | American Canadian Genealogical Society |
| ACHCCS | ATLANTIC CANADA HEALTH CARE COALITION SOCIETY |
| AChemS | Association for Chemoreception Sciences |
| ACHS | Adams County Historical Society |
| ACHS | Alachua County Humane Society |
| ACHS | Association of Collegiate Honor Societies |
| ACI | Association Canadienne de l'Informatique |
| ACI | Association Cartographique Internationale |
| ACI | Canadian Information Processing Society |
| ACI | International Cartographic Association |
| ACIEM | Asociacin Colombiana de Ingenieros |
| ACIEM | Asociación Colombiana de Ingenieros |
| ACIEM | Colombian Association of Engineers |