CEF may stand for:
- Caixa Econômica Federal
- Canadian Equestrian Federation, now known as Equine Canada
- Canadian Expeditionary Force
- Central Experimental Farm, Ottawa, Canada
- Centre d'Étude de la Forêt
- Chick Embryo Fibroblast (sometimes used for vaccine production)
- Child Evangelism Fellowship
- Cisco Express Forwarding
- Closed-end fund
- Common European Framework of Reference for Languages
- Conférence des évêques de France
- Czech Air Force ICAO airline code
- Westover Air Reserve Base/Metropolitan Airport in Massachusetts (IATA Airport Code CEF)
- Cheat Engine Forums
- Charles Edward Flower
- Chromium Embedded Framework