| Acronym | Definition |
|---|
| ADEC | Alaska Department of Environmental Conservation |
| ADEC | Abu Dhabi Education Council |
| ADEC | Action de Développement de l'Emploi et des Compétences (French: Employment and Skills Development Action) |
| ADEC | Advanced Digital Entertainment Corporation |
| ADEC | American Distance Education Consortium |
| ADEC | Australian Drug Evaluation Committee |
| ADEC | Association of Death Education and Counseling |
| ADEC | Autonomous Decentralized Traffic Control System (Japan) |
| ADEC | African Development Economic Consultants (South Africa) |
| ADEC | Advocacy Disability Ethnicity Community (Australia) |
| ADEC | Aylesbury Development Education Centre (UK) |
| ADEC | Aviation Digital Exploitation Capability |
| ADEC | Associate Degree Equivalency Certificate |
| ADEC | Asociación de Exportadores de Café (Coffee Exporters' Association, Guatemala) |
| ADEC | Astronomy Data Centers Executive Committee |
| ADEC | Airborne Defensive Electronic Countermeasures |
| ADEC | Association of Distance Education Colleges of South Africa (RSA) |
| ADEC | Adaptive Detection Estimation Correlation |
| ADEC | Arab Architectural Design and Engineering Consultancy (stock symbol) |
| ADEC | Advanced Diesel Electronic Controls |