AEF may refer to:

• Aboriginal Evangelical Fellowship, Australia
• Afrique Équatoriale Française or French Equatorial Africa
• Agricultural Industry Electronics Foundation
• Air Experience Flight
• Allied Expeditionary Force in World War II
• American Eagle Foundation
• American Expeditionary Forces, in World War I
• Asia Education Foundation
• Asian Pacific American Bar Association Educational Fund
• Association de l'enseignement français
• Astana Economic Forum
• Aviation Environment Federation
• Agence d'Essais Ferroviaires (in English: Railway Testing Agency), a SNCF division of laboratory and facilities to carry out testing in a variety of areas: mechanics, electrics, industrial hygiene, and the environment