| Acronym | Definition |
|---|
| EFSS➣Enterprise File Sync & Share (software) |
| EFSS➣Expeditionary Fire Support System (USMC) |
| EFSS➣Expeditionary Force Support Squadron (US DoD) |
| EFSS➣E. F. Schumacher Society (economic development; Great Barrington, MA) |
| EFSS➣Europe Fermetures Sécurité Systèmes (France) |
| EFSS➣Économie et Finance Sociales et Solidaires (French: Economy and Finance and Social Solidarity) |
| EFSS➣English Folk Song Society (now English Folk Dance and Song Society; est. 1898) |
| EFSS➣Electronic Filing and Service System (district court; Georgia) |
| EFSS➣Elizabeth Fry Society of Saskatchewan (Canada) |
| EFSS➣Experimental Flight Systems Section (NASA) |