| Acronym | Definition |
|---|
| ECST | Electro Convulsive Shock Therapy |
| ECST | European Carotid Surgery Trial |
| ECST | Engineering, Computer Science, and Technology (California State University; Los Angeles, CA) |
| ECST | École de Coiffure Ste-Thérèse (French: Hairdressing School of Ste-Thérèse; Ste-Thérèse, Canada) |
| ECST | Enhanced Configuration Summary Tool (software) |
| ECST | Entreprise de Chaudronnerie-Soudure et Tuyauterie (French: Welding and Boiler Piping Company) |
| ECST | Expeditionary Combat Skills Training |
| ECST | European Charter for Sustainable Tourism |
| ECST | Exercise Cardiac Stress Testing (cardiology) |