| Abbreviation | Definition |
|---|---|
| ACHS | Association of Collegiate Honor Societies |
| ACHS | Association of Critical Heritage Studies |
| ACI | Association des Chercheurs Iraniens |
| ACI | Association for Conservation Information |
| ACIA | Alabama Concrete Industries Association |
| ACIA | Arizona Court Interpreters Association |
| ACIC | Association Congolaise des Ingénieurs Civils |
| ACIH | Association Chrétienne des Invalides et Handicapés |
| ACIPF | Association Cooperative Industrielle du Pied de la Falaise |
| ACIS | Association for Computer and Information Science |
| ACISA | Auckland Cook Islands Sports Association |
| ACIT | Association for Critical and Interdisciplinary Thinking |
| ACIT | Association of Chemical Industry of Texas |
| ACJ | Association for Contemporary Jewellers |
| ACJA | All China Journalists Association |
| ACJA | All-China Journalists Association |
| ACJA | American Criminal Justice Association |
| ACJA | Association of Crypto Jews of the Americas |
| ACJA | Atlantic City Jitney Association |
| ACJCS | Association |