- ADEC stands for Alaska Department of Environmental Conservation
- ADEC stands for Abu Dhabi Education Council
- ADEC stands for Action de Développement de l’Emploi et des Compétences (French: Employment and Skills Development Action)
- ADEC stands for American Distance Education Consortium
- ADEC stands for Australian Drug Evaluation Committee
- ADEC stands for Association of Death Education and Counseling
- ADEC stands for Autonomous Decentralized Traffic Control System (Japan)
- ADEC stands for African Development Economic Consultants (South Africa)
- ADEC stands for Advocacy Disability Ethnicity Community (Australia)
- ADEC stands for Aylesbury Development Education Centre (UK)
- ADEC stands for Aviation Digital Exploitation Capability
- ADEC stands for Associate Degree Equivalency Certificate
- ADEC stands for Asociación de Exportadores de Café (Coffee Exporters’ Association, Guatemala)
ADEC