| ECS | Environmental Control System | - | Atmospheric Research Center |
| ECS | Electro-Chemical Society | - | Computer Acronyms(common) |
| ECS | Electroconvulsive Shock | - | Computer Acronyms(common) |
| ECS | Energy-corrected Sudden (scaling Theory In Mol. Collisions) | - | Computer Acronyms(common) |
| ECS | Engine Control SYstem | - | Organizations |
| ECS | Environmental Control System (Subsystem) | - | Organizations |
| ECS | Emergency Contact System - Enhanced Chip Set (computing) - EOSDIS Core System - Extended Chip Set (computing) | - | Astronomy |
| ECS | EOSDIS Core System | - | Business and Finance |
| ECS | Electronic Commerce Service
| - | Human Genome |
