- ADEG stands for Antiarrhythmic Drug Evaluation Group (cardiology)
- ADEG stands for Advanced Decentralised Energy Generation Systems in Western Balkans (Bosnia and Herzegovina)
- ADEG stands for Arbeitsgemeinschaft der EinkaufsGenossenschaften
- (German/Austrian retailer cooperative and supermarket franchise)
- ADEG stands for Asociación de Damas Españolas Guatemaltecas (Spanish-Guatemalan Ladies’ Association)
- ADEG stands for Auxiliary Display Equipment Group
ADEG