| Acronym | Definition |
|---|
| EFCN | Elder Friendly Community Network (Canada) |
| EFCN | Evangelical Free Church of Naperville (Naperville, IL) |
| EFCN | Explicit Forward Congestion Notification (Internet traffic) |
| EFCN | Environmental Finance Center Network (US EPA) |
| EFCN | Escondido First Church of the Nazarene (Escondido, CA) |
| EFCN | Étude et Fabrication à Commande Numérique (Tunisian manufacturing company) |
| EFCN | Engelse Ford Club Nederland (Dutch: English Ford Club Netherlands; est. 1985; Netherlands) |
| EFCN | European Forum of Cultural Networks |
| EFCN | Efficiency of Power Generation for Commercial Use with Nuclear |