| Acronym | Definition |
|---|
| DET | Detective |
| DET | Department of Education and Training (Australia) |
| DET | Detroit |
| DET | Detail |
| DET | Detector |
| DET | Detachment |
| DET | Division of Employment and Training (various locations) |
| DET | Direction de l'Exécution des Contrats de Travaux (French: Directorate for the Execution of Work Contracts) |
| DET | Determinant (mathematics) |
| DET | Detonator |
| DET | Detach(ed) |
| DET | Distributed Energy Technologies |
| DET | Detonate |
| DET | Detainee |
| DET | Differential Terminated |
| DET | Detection Error Tradeoff |
| DET | Dynamic Execution Technology |
| DET | Directory Entry Table |
| DET | Disability Equality Training (various locations) |
| DET | Department of Employment and Training |
| DET | Décentralisation et Économie des Territoires (French: Decentralization and the Economy of Territories) |
| DET | Data Entry Terminal |
| DET | Distortion Energy Theory |
| DET | N,N-Diethyltryptamine |
| DET | Departamento de Educación Teológica |
| DET | Data Element Type (function point analysis) |
| DET | Directory Entry Table (Novell NetWare) |
| DET | Direct Energy Transfer |
| DET | Depletion-Layer-Extended Transistor (circuits) |
| DET | Diffusion Électro Thermique (French: Electro Thermal Diffusion) |
| DET | Detached Duty (overtime forms) |
| DET | Detection Error Trade-Off |
| DET | Device Execute Trigger |
| DET | Division of Enterprise Technology (Utah and Wisconsin) |
| DET | Distributed Explosive Technology |
| DET | Digital Emotional Technology (JVC) |
| DET | Diplôme d'Etudes Théâtrales (French: Theatre Studies Diploma; various universities) |
| DET | Displaced Equipment Training |
| DET | Double End Trimmed (lumber) |
| DET | Data Event Table (PSIP, HDTV broadcasting) |
| DET | Determination of Equivalent Treatment |
| DET | Domestic Emission Trading |
| DET | Decomposition Event Tree |
| DET | Dynamic Environment and Terrain |
| DET | Diversity Education Team |
| DET | Directed Enforcement Team |
| DET | Development Error Tracer |
| DET | Dynamically Extensible Transfer |
| DET | Design Evaluation Test |
| DET | Date Entered Training |
| DET | Detailed Electrical Test |
| DET | Directorate of Educational Technology (US Army) |
| DET | Detroit City Airport, Detroit, Michigan (Airport Code) |
| DET | Director of Event Technology |
| DET | Displaced Equipment Team |