| Abbreviation | Definition |
|---|---|
| ACCT | Arab Community Centre of Toronto |
| ACCTS | Association For Christian Conferences Teaching And Service |
| ACCTS | Association for Christian Conferences, Teaching, and Service |
| ACCW | Americans Caring for Children Worldwide |
| ACDA | African Cultural and Development Association |
| ACDF | Abilities Car Donation Foundation |
| ACDF | African Citizens Development Foundation |
| ACDF | American Committee for Devastated France |
| ACDO | American Cellular Donation Organization |
| ACDS | American Contact Dermatitis Society |
| ACE | Accessing Creative Expression |
| ACE | Advocacy and Communication for Everyone |
| ACE | American Cultural Exchange |
| ACE | Association of Communication Excellence |
| ACEEE | American Council for an Energy Efficient Economy |
| ACEEE | Association of Computer Electronics and Electrical Engineers |
| ACEHSA | Accrediting Commission on Education for Health Services Administration [later became CAHME] |
| ACES | Another Chance for English Setters |
| ACES | Association For Children For Enforcement Of Support |
| ACES | Association for Children for the Enforcement of Support |