| Abbreviation | Definition |
|---|---|
| ACDM | Africa Community Development Media |
| ACE | Advanced Computer Entertainment |
| ACE | American Cinema Editors |
| ACE | American Classic Edition |
| ACE | Assistant Community Editor |
| ACE | Awards For Cablecasting Excellence |
| ACFC | Angela Cartwright Fan Club |
| ACFF | American Conservation Film Festival |
| ACFF | Animal Crossing Fanitics Forum |
| ACFF | Asian Children's Film Festival |
| ACFG | Animal Crossing Friends Gathering |
| ACFK | Asociace Ceskych Filmovych Klubu |
| ACFW | American Christian Fiction Writers |
| ACG | Armed Cute Girls |
| ACIP | Asian Classics Input Project |
| ACJU | All Ceylon Jemmiyyathul Ulma |
| ACLU | American Civil Liberties Union |
| ACMC | Asian Congress for Media and Communication |
| ACMI | Arlington Community Media Inc |
| ACMP | Association of Comics Magazine Publishers |