| Abbreviation | Definition |
|---|---|
| ACAF | Asia Computer Animation Festival |
| ACB | anonymous conference board |
| ACB | Anonymous Confession Board |
| ACBC | Atlanta Catholic Business Conference |
| ACBC | Australian Catholic Bishops Conference |
| ACBS | Auckland Confederation of Billiard |
| ACC | All Conference Cheer |
| ACC | Almost College Conference |
| ACC | American Conference of Cantors |
| ACC | Antlanctic Coast Conference |
| ACC | Asthmatic Children's Conference |
| ACCAC | Atlantic Coast Christian Athletic Conference |
| ACCC | Alabama Community College Conference |
| ACCC | Atlantic Collegiate Cycling Conference |
| ACCE | Automotive Composites Conference and Exhibition |
| ACCE | Automotive Composites Conference Exhibition |
| ACCESS | Alagappa Chettiar College of Engineering Students Symposium |
| ACDR | Asian Conference on Disaster Reduction |
| ACES | Annual Conference For Engineering Students |
| ACFA | Asian Committee for Future Accelerators |