| Acronym | Definition |
|---|
| ACCO | ASCO (American Society of Clinical Oncology) Core Curriculum Outline |
| ACCO | Association of Climate Change Officers (Washington, DC) |
| ACCO | American Chain Company (est. 1904) |
| ACCO | American College of Chiropractic Orthopedists |
| ACCO | American Cyanamid Company |
| ACCO | Association of County Commissioners of Oklahoma |
| ACCO | Adenoid Cystic Carcinoma Organization |
| ACCO | American Clip Company |
| ACCO | Asian Canadian Cultural Organization (University of British Columbia; Canada) |
| ACCO | Autocross Club of Central Oregon (Bend, OR) |
| ACCO | Assistant Central Control Officer |