| Abbreviation | Definition |
|---|---|
| ACGA | American Cut Glass Association |
| ACGA | Asian Corporate Governance Association |
| ACGA | Association of Chinese Geneticists in America |
| ACGA | Australian Commonwealth Games Association |
| ACGB | Association cantonale genevoise de badminton |
| ACGCM | Association des Collectionneurs de Guides et Cartes Michelin (French: Collectors of Michelin Guides |
| ACGR | Association Cantonale Genevoise de Rugby |
| ACGS | Association for Clinical Genetic Science |
| ACGS | Association for Clinical Genomic Science |
| ACGS | Association of Chemistry Graduate Students |
| ACGS | Association of Communication Graduate Students |
| ACH | Association for Computers and the Humanities |
| ACHA | Adult Congenital Heart Association |
| ACHA | American Catholic Historical Association |
| ACHA | American Collegiate Horsemen's Association |
| ACHA | American Cutting Horse Association |
| ACHA | Association for Communal Harmony in Asia |
| ACHD | Association of California Healthcare Districts |
| ACHDR | Association du Centre Historique de la Diffusion Radiophonique |
| ACHS | Association of College Honor Societies |