| ETCS | East Tennessee Chinese School 
| Others |
| ETCS | East Tennessee Computer Society
| Others |
| ETCS | East Texas Christian School
| Others |
| ETCS | Educating Though Care Scotland
| Others |
| ETCS | Electrolytic Tin Coated Steel
| Others |
| ETCS | Electronic Throttle Control System
| Others |
| ETCS | Electronic Toll Collection System
| Others |
| ETCS | Electronic Traction Control System
| Others |
| ETCS | Electronics Technician Senior Chief Petty Officer
| Others |
| ETCS | Elementary Theory of the Category of Sets
| Others |
| ETCS | Endurance Touring Car Series
| Others |
| ETCS | Engine Throttle Control System
| Others |
| ETCS | Engineering Technology and Computer Science
| Others |
| ETCS | Epoch Technology Consulting Services
| Others |
| ETCS | European Train Control System
| Others |
| ETCS | Extension Technology and Computer Services
| Others |