| Abbreviation | Definition |
|---|---|
| ACE | Atmospheric Collection Equipment |
| ACES | Atlantic Coral Ecosystem Study |
| ACFK | Aquaculture Center of the Florida Keys |
| ACFM | Advisory Committee for Fisheries Management |
| ACFR | Advisory Committee on Fishery Research |
| ACG | Advanced Computing Group |
| ACIC | Aeronautical Charting and Information Center |
| ACME | Advisory Committee on the Marine Environment |
| ACMP | Advisory Committee on Marine Pollution |
| ACMRR | Advisory Committee of Experts on Marine Resources Research |
| ACO | Association of Commissioned Officers |
| ACOH | Advisory Committee for Operational Hydrology |
| ACOM | Australian Community Ocean Model |
| ACOMR | Advisory Committee on Oceanic Meteorological Research |
| ACOPS | Advisory Committee on Protection of the Sea |
| ACPF | Atlantic Coastal Plain Flora |
| ACSPO | Advanced Clear-Sky Processor for Oceans |
| ACSYS | Arctic Climate System Study |
| ACWG | Asian Carp Work Group |
| ACWS | Adelaide Coastal Waters Study |