| Acronym | Definition |
|---|
| ATMC | Advanced Technology and Manufacturing Center (University of Massachusetts Dartmouth) |
| ATMC | Automotive Training Managers Council |
| ATMC | Ante Todo Mucha Calma (Spanish: Above All Very Calmly; album) |
| ATMC | Atlantic Telephone Membership Corporation (Shallotte, North Carolina) |
| ATMC | An Teallach Mountaineering Club (Scotland) |
| ATMC | Air Transport Movement Control Center |
| ATMC | Admiralty Transmitting Magnetic Compass |
| ATMC | Asynchronous Transfer Mode Chip |
| ATMC | According To My Calculations |
| ATMC | Automação e Telecomunicação Ltd (Portugese: Automation and Telecommunication) |
| ATMC | Altitude - Training and Management Consultants (Australia) |
| ATMC | Alternative to Meds Center (San Francisco, CA) |