| Acronym | Definition |
|---|
| ECSA | Engineering Council of South Africa |
| ECSA | European Community Shipowners’ Associations (Belgium) |
| ECSA | Eastern, Central and Southern Africa |
| ECSA | Extended Common Service Area |
| ECSA | Extended Common System Area |
| ECSA | European Community Studies Association |
| ECSA | Electoral Commission of South Australia |
| ECSA | Exchange Carriers Standards Association |
| ECSA | European Conference on Software Architecture |
| ECSA | European Corporate Security Association (est. 2005) |
| ECSA | European Customs Sports Association (est. 1992) |
| ECSA | Essex County Soccer Association (Canada) |
| ECSA | Eastern Christian School Association (New Jersey) |
| ECSA | European Chlorinated Solvent Association |
| ECSA | Estuarine & Coastal Sciences Association |
| ECSA | Eastern Carolina Soccer Association |
| ECSA | Extended Common Storage Areas (IBM and other mainframe systems) |
| ECSA | Error-Constrained Sparse Approximation |