| ADEC | Abu Dhabi Education Council 
| Others |
| ADEC | Adjacent Double Bit Error Correcting
| Others |
| ADEC | Adult Driver Education Course
| Others |
| ADEC | Advanced Design Engineering Consultancy
| Others |
| ADEC | Advanced Diesel Engine Control
| Others |
| ADEC | Advanced Digital Entertainment Corporation
| Others |
| ADEC | Advocacy Disability Ethnicity Community
| Others |
| ADEC | Alaska Department of Environmental Conservation
| Others |
| ADEC | Alliance for Distance Education in California
| Others |
| ADEC | American Distance Education Consortium
| Others |
| ADEC | Arts Development in East Cambridgeshire
| Others |
| ADEC | Associate Degree Equivalency Certificate
| Others |
| ADEC | Association Des Etudiants de Chimie
| Others |
| ADEC | Audi Driving Experience Center
| Others |
| ADEC | Audio Decoder
| Others |
| ADEC | Australian Drug Evaluation Committee
| Others |
| ADEC | Autism Detection in Early Childhood
| Others |
| ADEC | Aviation Machinist's Mate (engine Mechanic) Chief Petty Officer
| Others |