| Acronym | Definition |
|---|
| ECSL | East Coast School of Languages (Canada) |
| ECSL | European Centre for Space Law |
| ECSL | Earth Charter Sierra Leone |
| ECSL | Embedded Control Systems Language (distributed processing) |
| ECSL | Espoir Cycliste de Sainte Luce (French cycling club) |
| ECSL | End Customer Service Level |
| ECSL | Espace Culturel Sud Loire (French: Cultural Center South Loire) |
| ECSL | Equivalent Continuous Sound Level (electronic controled transmission) |
| ECSL | Étoile Cycliste Sud Luberon Rognes (French cycling club) |
| ECSL | European Counter-Strike League |
| ECSL | Edmonton Christian Soccer League (Canada) |
| ECSL | Enforcement Compliance Schedule Letter |
| ECSL | Experimental Computer Systems Laboratory |
| ECSL | Emulation Code Security Logic |
| ECSL | East Citrus Soccer League (Inverness, FL) |