- ADEF stands for Association pour le Développement des Foyers (French: Home Development Association)
- ADEF stands for Apprentissage, Didactique, Evaluation, Formation (French: Learning, Teaching, Assessment, Training)
- ADEF stands for Association des Exportateurs de Films (French: Film Exporters Association)
- ADEF stands for Ambulatory Diabetes Education and Follow-Up (health education program; Maine)
- ADEF stands for African Development and Education Foundation
- ADEF stands for Asian Development Equity Fund
ADEF