| Acronym | Definition |
|---|
| ECAS | Escuela de Contadores Auditores de Santiago (Spanish: Auditors Accountants School of Santiago; Santiago, Chile) |
| ECAS | Epidemiological Catchment Area Study (psychiatric study) |
| ECAS | Electronically Controlled Air Suspension |
| ECAS | Environmental Compliance Assessment System |
| ECAS | Emergency Committee of Atomic Scientists (est. 1946) |
| ECAS | Eberly College of Arts and Sciences (West Virginia University) |
| ECAS | Eight Color Asteroid Survey |
| ECAS | Executive Committee of the Academic Senate (various schools) |
| ECAS | Emergency Close Air Support |
| ECAS | Entreprise de Chauffage Automatique et Sanitaire (French: Automatic Heating and Sanitary Company) |
| ECAS | Expressions Culture et Art Scénique (French: Scenic Art and Culture Expressions) |
| ECAS | East Coast Aviation Supply |
| ECAS | European Center of Adaptive Systems |
| ECAS | Euro-Citizens' Action Service |
| ECAS | Electronic Commerce Authentication System (Verisign, Inc.) |
| ECAS | ESSX Customer Administration Service |
| ECAS | Enhanced Cost Accounting System |
| ECAS | External Compliance and Assessment System |
| ECAS | Elmira-Corning Astronomical Society |
| ECAS | Engine/System Crew Alerting System |
| ECAS | Eddie Cantor Appreciation Society |
| ECAS | Expertise Conseil Audit Stratégie (French: Audit Strategy Expertise Council) |
| ECAS | Electronic Customs Automation System (Bahrain) |
| ECAS | Eisenhower Center for American Studies (University of New Orleans) |
| ECAS | East Coast All Stars (band) |