| Abbreviation | Definition |
|---|---|
| ACAS | Advisory Conciliation and Arbitration Service |
| ACAS | Advisory Counselling and Arbitration Service |
| ACAWS | Advisory Caution and Warning System |
| ACB | Advisory Committee on Biologicals |
| ACCA | Advisory Committee on Colleague Assistance |
| ACCD | Advisory Committee on Communicable Diseases |
| ACCM | Advisory Council for the Church's Ministry |
| ACCO | Advisory Committee of Commission Officers |
| ACCTS | Advisory Committee on Clinical and Translational Science |
| ACD | Advisory Committee to the Director |
| ACDP | Advisory Committee for Data Policy |
| ACDP | Advisory Committee on Dangerous Pathogens |
| ACEC | Advisory Committee on Electromagnetic Compatibility |
| ACET | Advisory Council for the Elimination of Tuberculosis |
| ACFAC | Adult Cystic Fibrosis Advisory Committee |
| ACFR | Advisory Committee on Fisheries Research |
| ACFR | Advisory Committee on Fishery Reasearch |
| ACFS | Advisory Council of Faculty Senates |
| ACHAC | Aboriginal Cultural Heritage Advisory Committee |
| ACHP | Advisory Council on Historic Preservation |