| Acronym | Definition |
|---|
| EFK | Evangeliska FriKyrkan (Swedish denomination) |
| EFK | Evangeliska Frikyrkan (Swedish: Evangelical Free Church) |
| EFK | Écoles Françaises de Karting (French: French Karting School) |
| EFK | École Française de Kite (French: French Kite School) |
| EFK | École Française du Kansaï (French: French School of Kansai) |
| EFK | Extended Fisher-Kolmogorov (mathematical equation) |
| EFK | Eesti Filharmoonia Kammerkoor (Estonian: Estonian Philharmonic Chamber Choir) |
| EFK | Elasticsearch Fluentd +Kibana (data) |
| EFK | Electrified (Grid) Fly Killers |
| EFK | Enskede Frisbee Klubb (Swedish: Enskede Frisbee Club; Enskede, Sweden) |