| Abbreviation | Definition |
|---|---|
| ACSE | Association of Chinese Scientists and Engineers |
| ACSE | Association of Consulting Structural Engineers |
| ACSEC | Association Culturelle et Sportive Euro Chinoise |
| ACSES | Association of Computational Science and Engineering Students |
| ACSFP | Association of Chartered Senior Financial Planners |
| ACSG | Association canadienne des |
| ACSG | Association Canadienne des Surintendants de Golf |
| ACSMA | Atlantic Coast Sports Media Association |
| ACSOL | Association Canine du Sud Ouest Lyonnais |
| ACSOS | Association Culturelle Sociale Ou Sportive |
| ACSP | Association of Closet and Storage Professionals |
| ACSUS | Association for Canadian Studies in the United States |
| ACSV | Association of Consulting Surveyors Victoria |
| ACSYA | Assyrian Cultural & Social Youth Association Inc. |
| ACT | Association for Commuter Transportation |
| ACT | Association for Contract Textiles |
| ACTA | Association of Canadian Travel Agencies |
| ACTA | Auckland Coffee and Tea Association |
| ACTA | Australian Clay Target Association |
| ACTAA | Arkansas Communication and Theatre Arts Association |