| Acronym | Definition |
|---|
| ECSO➣Etowah County Sheriff's Office (Gadsden, AL) |
| ECSO➣Emergency Communications of Southern Oregon (Medford, OR) |
| ECSO➣Eastern Connecticut Symphony Orchestra (New London, CT) |
| ECSO➣European Council of Skeptical Organizations |
| ECSO➣Educational Career Services Office (University of Illinois) |
| ECSO➣Environmental Civil Society Organization |
| ECSO➣Économie et Coordination du Sud Ouest (French: Economy and Coordination of the Southwest) |
| ECSO➣Emerald City Swing Orchestra (Dublin, OH) |
| ECSO➣Enterprise Computing Solutions Organisation |
| ECSO➣English and Communication Student Organization (Potsdam University; New York) |
| ECSO➣Eton College Symphony Orchestra |