| Abbreviation | Definition |
|---|---|
| EFCS | European Federation of Cytology Societies |
| EFCT | European Federation of Conference Towns |
| EFDF | Earth Federation Defense Force |
| EFDF | Estonian Flying Disc Federation |
| EFDS | English Federation of Disability Sport |
| EFEE | European Federation of Education Employers |
| EFEO | European Federation of Essential oils |
| EFET | European Federation of Energy Traders |
| EFF | Elite Federation Force |
| EFHA | European Federation Historic Aviation |
| EFHK | Employers Federation of Hong Kong |
| EFI | Equestrian Federation of Indonesia |
| EFI | European Federation for Immunogenetics |
| EFIA | Egyptian Federation of investors Associations |
| EFIC | European Federation of IASP Chapters |
| EFIM | European Federation of Internal Medicine |
| EFLA | European Federation for Landscape Architecture |
| EFLA | European Federation of Liberian Associations |
| EFLS | European Federation of Local Solidarity |
| EFMD | European Federation for Management Development |