| Acronym | Definition |
|---|
| ECSS | European College of Sport Science |
| ECSS | European Cooperation for Space Standardization |
| ECSS | European Computer Science Summit |
| ECSS | Expeditionary Combat Support System |
| ECSS | En Community Services Society (est. 2003; Singapore) |
| ECSS | European Coronary Surgery Study |
| ECSS | Electro Control Supervisory System |
| ECSS | Exalted Carrier Single Sideband |
| ECSS | EOS Common Spacecraft Specification |
| ECSS | Enhanced Cruise Support Systems |
| ECSS | Evolving Complex Software Systems (France) |
| ECSS | Equipment Communication Subsystem |
| ECSS | Economics and Commerce Student Society (Australia) |