| DEC | Daily Effective Circulation 
| Others |
| DEC | Daimler Enthusiasts Club
| Others |
| DEC | Dallas Entrepreneur Center
| Others |
| DEC | Dana Energy Company
| Others |
| DEC | Darico Ecosystem Coin
| Others |
| DEC | Darn Expensive Component
| Others |
| DEC | Data Entry Clerk
| Others |
| DEC | Data Exchange Center
| Others |
| DEC | Dead End Cruisers
| Others |
| DEC | Deaf Emergency Calling
| Others |
| DEC | Decatur Airport
| Others |
| DEC | Decatur Airport, Decatur, Illinois USA
| Others |
| DEC | Deceased
| Others |
| DEC | December
| Month |
| DEC | DECiduous
| Others |
| DEC | Decimal
| Mathematics, Number, Number System |
| DEC | Declination
| Others |
| DEC | Decoded file
| Others |
| DEC | Decoding Circuit
| Others |
| DEC | DECompose
| Others |
| DEC | Decomposer
| Others |
| DEC | Decompressor
| Others |
| DEC | Decrease
| Others |
| DEC | Decrement
| Others |
| DEC | Decryption
| Others |
| DEC | Defects Expiration Contamination
| Others |
| DEC | Delaware Electric Cooperative
| Others |
| DEC | Delco Electronics Corporation
| Others |
| DEC | Delhi Cantt
| Others |
| DEC | Dell EMC Certified
| Others |
| DEC | Delphi Encryption Compendium
| Others |
| DEC | Delta Epsilon Chi
| Others |
| DEC | DEME Environmental Contractors
| Others |
| DEC | Dendritic Epidermal Cell
| Others |
| DEC | Dental Education Clinic
| Others |
| DEC | Department Emergency Coordinator
| Others |
| DEC | Department Evaluation Committee
| Others |
| DEC | Department of Engineering Cybernetics
| Others |
| DEC | Department of Environment and Conservation
| Others |
| DEC | Department of Environmental Conservation
| Others |
| DEC | Department of Environmental Control
| Others |
| DEC | Dependable Economical and Capable
| Others |
| DEC | Desiccative Evaporative Cooling
| Others |
| DEC | Design Educators Community
| Others |
| DEC | Design Estimating and Construction
| Others |
| DEC | Design Execution Council
| Others |
| DEC | Design, Execute, Control
| Others |
| DEC | Designed and Engineered Composites
| Others |
| DEC | Desquamated Epithelial Cell
| Others |
| DEC | Detroit Economic Club
| Others |
| DEC | Development and Evaluation Committee, subsumed by NICE
| Others |
| DEC | Development Experience Clearinghouse
| Others |
| DEC | Di Ethyl Carbamazine
| Others |
| DEC | Diagnostic Episode Cluster
| Others |
| DEC | Diagnostic Evaluation Center
| Others |
| DEC | Diesel Electronic Control
| Others |
| DEC | Diesel Emissions Control
| Others |
| DEC | Diethyl Carbonate
| Others |
| DEC | Diethylcarbamazine Citrate
| Others |
| DEC | Different Error Costs
| Others |
| DEC | Digital Electronic Computer
| Others |
| DEC | Digital Electronic Controller
| Others |
| DEC | Digital Engine Control
| Others |
| DEC | Digital Entertainment Center
| Others |
| DEC | Digital Epistemological Cycles
| Others |
| DEC | Digital Equipment Company
| Others |
| DEC | Digital Equipment Corp
| Others |
| DEC | Digital Equipment Corporation
| Others |
| DEC | Digital Ethernet Personal Computer
| Others |
| DEC | Direct Energy Conversion
| Others |
| DEC | Direct Evaporative Cooling
| Others |
| DEC | Directory Entry Code
| Others |
| DEC | Directory Expert Conference
| Others |
| DEC | Directory Experts Conference
| Others |
| DEC | Disability Empowerment Center
| Others |
| DEC | Disaster Emergency Committee
| Others |
| DEC | Disasters Emergencies Committee
| Others |
| DEC | Disasters Emergency Committee
| Others |
| DEC | Discounted Eligible Costs
| Others |
| DEC | Display Energy Certificate
| Others |
| DEC | Display Energy Certificates
| Others |
| DEC | Distance Education Centre
| Others |
| DEC | Distance Education Consortium
| Others |
| DEC | Distance Education Council
| Others |
| DEC | District Effectiveness and Compliance
| Others |
| DEC | District Emergency Coordinator
| Others |
| DEC | District Executive Committee
| Others |
| DEC | District Export Council
| Others |
| DEC | Diversified Education Curriculum
| Others |
| DEC | Division for Early Childhood
| Others |
| DEC | Division of Education and Communication
| Others |
| DEC | Do Expect Cuts
| Others |
| DEC | Dolphin Energy Club
| Others |
| DEC | Domiciled European Community
| Others |
| DEC | Domina Easter Convention
| Others |
| DEC | Dominion Executive Committee
| Others |
| DEC | Donnellson Entertainment Committee
| Others |
| DEC | Doppler echocardiography
| Others |
| DEC | Double Error Correction
| Others |
| DEC | Douglas Education Center
| Others |
| DEC | Downhill, Etc., Crew
| Others |
| DEC | Downtown Event Center
| Others |
| DEC | Driver Education Center
| Others |
| DEC | Driver Education Certificate
| Others |
| DEC | Driver Education Completion
| Others |
| DEC | Driver Education Course
| Others |
| DEC | Driver Eligibility Certificate
| Others |
| DEC | Driving Experience Centre
| Others |
| DEC | Driving Experience Control
| Others |
| DEC | Drug Endangered Children
| Others |
| DEC | Drug Enforcement Commission
| Others |
| DEC | Drug Evaluation and Classification
| Others |
| DEC | Dublin Entrepreneurial Center
| Others |
| DEC | Duct Epithelial Cells
| Others |
| DEC | Ductible Employee Contribution
| Others |
| DEC | Dynamic Event Creator
| Others |