| ECSA | East Central and Southern African 
| Others |
| ECSA | East Coast of South America
| Others |
| ECSA | Eastern Carolina Soccer Association
| Others |
| ECSA | Eastern Central and Southern Africa
| Others |
| ECSA | Eastern Christian School Association
| Others |
| ECSA | Eastern Connecticut Sailing Association
| Others |
| ECSA | EC CouncilCertified Security Analyst
| Others |
| ECSA | EConomics and Statistics Administration
| Others |
| ECSA | Edinburgh College Student Association
| Others |
| ECSA | Edinburgh College Students Association
| Others |
| ECSA | Edinburgh College Students' Association
| Others |
| ECSA | Electoral Commission of South Australia
| Others |
| ECSA | Emerald City Softball Association
| Others |
| ECSA | Emerald Coast Sailing Association
| Others |
| ECSA | Engineering Council of South Africa
| Others |
| ECSA | Engineering Council South Africa
| Others |
| ECSA | Essex County Soccer Association
| Others |
| ECSA | Estuarine and Coastal Science Association
| Others |
| ECSA | Estuarine and Coastal Sciences Association
| Others |
| ECSA | Estuarine Coastal Sciences Association
| Others |
| ECSA | European Chlorinated Solvent Association
| Others |
| ECSA | European Citizen Science Association
| Others |
| ECSA | European Community Shipowners Associations
| Others |
| ECSA | European Community Shipowners' Associations
| Others |
| ECSA | European Community Studies Association
| Others |
| ECSA | European Composer and Songwriter Alliance
| Others |
| ECSA | European Conference on Software Architecture
| Others |
| ECSA | European Corporate Security Association
| Others |
| ECSA | European Customs Sports Association
| Others |
| ECSA | Evangelical Congregational Soteriological Adventist
| Others |
| ECSA | Exchange Carriers Standards Association
| Others |
| ECSA | Expedition to Circumnavigate South America
| Others |
| ECSA | Extended channel switch announcement
| Others |
| ECSA | Extended Common Service Area
| Others |
| ECSA | Extended Common Storage Areas
| Others |
| ECSA | Extended Common System Area
| Others |