| Acronym | Definition |
|---|
| EFCI | Explicit Forward Congestion Indication |
| EFCI | External Function Call Interface |
| EFCI | Evangelical Free Church of India (Christianity) |
| EFCI | Electrical Fault Circuit Interrupter (safety device) |
| EFCI | École Française de Commerce International et d'Informatique (French: French School of International Business and Computing; Morocco) |
| EFCI | European Federation of Cleaning Industries (est. 1988; Brussels, Belgium) |
| EFCI | Evangelical Formosan Church of Irvine (religious organization; Irvine, CA) |
| EFCI | Estuarine Fish Community Index (multimetric fish index) |
| EFCI | Eligible Fixed Capital Investment (finance; India) |