| ETSA | Electricity Trust of South Australia
| Others |
| ETSA | Electronics Technician Seaman Apprentice
| Others |
| ETSA | Elmhurst Teaching School Alliance
| Others |
| ETSA | Enriched Tryptic Soy Agar
| Others |
| ETSA | European Telecommunication Services Association
| Others |
| ETSA | European Television Services Association
| Others |
| ETSA | European Textile Services Association
| Others |
| ETSA | European Thermal Spray Association
| Others |
| ETSA | European Training and Simulation Association
| Others |
| ETSA | Eye Tracking South Africa
| Others |
| ETSA | Landsberg Air Base, S-Germany
| Others |