| Acronym | Definition |
|---|
| ECSD | Enhanced Csd |
| ECSD | Edmonton Catholic School District (Edmonton, Alberta, Canada) |
| ECSD | Enhanced Circuit Switched Data |
| ECSD | East China School District (Michigan) |
| ECSD | Elko County School District (Nevada) |
| ECSD | Essex County Sheriff's Department (Massachusetts) |
| ECSD | Eagle County School District (Colorado, USA) |
| ECSD | Ellenville Central School District (New York) |
| ECSD | Environmental and Conservation Services Department (Texas) |
| ECSD | Enlarged City School District |
| ECSD | Escrime Club Saint-Doulchard (French fencing club) |
| ECSD | East Coast Sour Diesel |
| ECSD | Ecumenical Council of San Diego County |
| ECSD | Estonian Central Securities Depository |
| ECSD | Electronic Communication System Design, LLC (Purcellville, VA) |