| Defense Data Architecture | Academic & Science |
| Discrete Dipole Approximation | Academic & Science |
| Dembling + Dembling Architects, P.C. | Academic & Science |
| Danish Data Archive | Academic & Science |
| Demand-driven acquisition | Academic & Science |
| Diesel Driving Academy | Academic & Science |
| Division on Dynamical Astronomy | Academic & Science |
| Dance Academy | Academic & Science |
| Demand Deposit Account | Accounts and Finance |
| Depreciation, Depletion and Amortizatinon | Business |
| Demand Deposit Accounting | Business |
| Dividend Disbursing Agent | Business |
| Demello D'entremont Associates | Business |
| Doha Development Agenda | Business |
| Developmental Disabilities Association | Community |
| Decentralized Derivatives Association | Community |
| Discuss, Do, and Achieve | Community |
| Disabled Drivers Association | Community |
| Delhi Development Authoritydefault | Community |
| Dogs for Disabled Americans | Community |
| Dallas Darts Association | Community |
| Dairy Development Authority | Community |
| Dallas Diagnostic Association | Community |
| Developer Distribution Agreement | Computing |
| Design Data Analysis | Computing |
| Dual Display Architecture | Computing |
| Distributed Data Access | Computing |
| Direct Directional Antenna | Computing |
| Due Data Availability | Computing |
| Digital Data Acquisition | Computing |
| Dynamic Digital Advertising | Computing |
| Digital Dealers Association | Computing |
| Disk Drive Adapter | Computing |
| Database Driven Applications | Computing |
| Delhi Development Authority | Delhi Government |
| Digital Differential Analyzer | Electronics |
| Design Discussion Archive | General |
| Demand Deposit Accounts | General |
| Day by Day Agape | General |
| Digestive Disorders Associates Digestive Disorders Associates | General |
| Download Dynamic Applications | General |
| Department for Disarmament Affairs | General |
| Dattner Dispoto and Associates | General |
| Digital Differential Analyser | General |
| Direct Debit Authorization | General |
| Direct Device Assignment | General |
| Direct Deposit Advice | General |
| Dynamic Data Authentication | General |
| Data Dependent Acquisition | General |
| Domain Defined Attribute | General |
| Ding Dongs Anonymous | General |
| Deaf Dog Advocate | General |
| Discrete Device Assignment | General |
| Dynamic Difficulty Adjustment | General |
| Dual Disorders Anonymous | General |
| Direct Deposit Account | General |
| Design Distinction Awards | General |
| Detroit Diesel Allison | General |
| Direct Drive Axle | General |
| Daf Driver Academy | General |
| Defensive Driving Academy | General |
| Drowsy Driver Alert | General |
| Driver Drowsiness Alert | General |
| Designated Drivers Association | General |
| Designated Driver Alternative | General |
| Dual Diagnosis Anonymous | General |
| Directory Distributing Associates | General |
| Delaware Department of Agriculture | General |
| Digestive Disorders Associates | General |
| Demand Driven Acquisitions | General |
| Dansk Data Arkiv | General |
| Direct Debit Authority | Governmental |
| Death with Dignity Act | Governmental |
| Developmental Disabilities Administration | Governmental |
| Don't Defy America | Governmental |
| Deputy District Attorney | Governmental |
| Division of Drug Analysis | Governmental |
| Disability Discrimination Act | Governmental |
| Downtown Development Authority | Governmental |
| DURAUNDHA JN | Indian Railway Station |
| Dutch Direct Auction | International |
| Digital Display Advertising | Internet |
| Dangerous Drug Act | Medical |
| Depressed Drug Addict | Medical |
| Dispensing Doctors' Association | Medical |
| Dangerous Drug Act (U.K.) | Medical |
| Dangerous Drugs Act | Medical |
| Descriptive Data Analysis | Medical |
| dideoxyadenosine | Medical |
| Digital Differential Analysis | Medical |
| Disability Discrimination Act 1995 | Medical |
| DNA dependent ATPase | Medical |
| Developmental Disabilities Agencies | Medical |
| Department of Drug Administration | Medical |
| Deputy Director for Administration | Military and Defence |
| Designated Development Activity | Military and Defence |
| Division Design Analysis | Military and Defence |
| Digital Directional Antenna | Radio Science |
| Data Driven Application | Softwares |
| Document (interface Control Document) Departure Authorization | Space Science |
| Data Delivery Acknowledgement | Space Science |
