| Acronym | Definition |
|---|
| PTAC | Procurement Technical Assistance Center (US DoD) |
| PTAC | Poids Total Autorisé en Charge |
| PTAC | Parent Teacher Advisory Council (various locations) |
| PTAC | Public Transit Advisory Committee (various locations) |
| PTAC | Packaged Terminal Air Conditioning |
| PTAC | Petroleum Technology Alliance of Canada |
| PTAC | Poid Total en Charge (France) |
| PTAC | Printing Technology Association of China |
| PTAC | Postal and Telecommunication Appliances Corporation (China) |
| PTAC | PhotoTelesis Tactical Communications (image exchange protocol) |
| PTAC | Preparedness Technical Assistance Center (Dynamis) |