| Acronym | Definition |
|---|
| ECAC | Eastern College Athletic Conference |
| ECAC | European Civil Aviation Conference |
| ECAC | Enhanced Call Admission Control |
| ECAC | Exceptional Children's Assistance Center (Davidson, NC, USA) |
| ECAC | Evasion Conduct after Capture (US DoD) |
| ECAC | Electromagnetic Compatibility Analysis Center |
| ECAC | Expertise Comptable Commissariat aux Comptes (French: Chartered Accountant Statutory Auditors) |
| ECAC | East Coast Australian Current |
| ECAC | Estimated Cost At Completion |
| ECAC | East Coast Armaments Complex |
| ECAC | Energy Cost Adjustment Charge |
| ECAC | Electromagnetic Compatibility and Analysis Center |
| ECAC | Executive Committee for Academic Computing |
| ECAC | Enhanced Counterair Capability (Army) |