| Acronym | Definition |
|---|
| CMAC | Cipher-Based Message Authentication Code |
| CMAC | Centralized Maintenance and Administration Center |
| CMAC | Cipher Based Mac |
| CMAC | Compression Mac |
| CMAC | Certified Management Accountants of Canada |
| CMAC | Cerebellar Model Articulation Controller |
| CMAC | Christian and Missionary Alliance in Canada |
| CMAC | Cambodia Mine Action Centre |
| CMAC | Canadian Marine Advisory Council |
| CMAC | Confectionery Manufacturers Association of Canada |
| CMAC | Capital Military Assistance Command |
| CMAC | Contemporary Medical Archives Centre |
| CMAC | Centre Meteorologique Aeronautique du Canada (French: Aeronautical Meteorological Center of Canada) |
| CMAC | Columbia Marine Aquarium Club |
| CMAC | Cerebella Model Arithmetic Computer |
| CMAC | Conference & Meeting Assistance Corporation |
| CMAC | Christian Mission Aid Canada |
| CMAC | CHAMPUS Maximum Allowable Cost |
| CMAC | Cryptomaterial Management and Assistance Centre (Canadian government) |
| CMAC | Central Management Army Commissaries |
| CMAC | Chemical & Molecular Analysis Centre |
| CMAC | CHAMPUS (Civilian Health and Medical Program of the Uniformed Services) Maximum Allowable Charges (healthcare; US DoD) |