| DAA | Data Access Arrangement |
| DAB | Designated Audit Body |
| DAC | Digital-to-Analog Converter |
| DAM | Digital Asset Management |
| DAP | Donor Acceptor Pairs (recombination) |
| DARPA | Defense Advanced Research Projects Agency (now ARPA) |
| DART | Dual Asynchronous Receiver Transmitter |
| DAS | Dimer-Adatom Stacking; Direct Absorption Spectroscopy; Digital Audio System |
| DASSL | Differential Algebraic System SoLver |
| DATALEED | LEED w/ extremely fast data acquisition&computer processing |
| DATC | Design Automation Technical Committee (IEEE) |
| DAV | Distributed Authoring and Versioning |
| D/B | Die Bonding |
| dBa | Adjusted decibel |
| DBE | Donor Bound Exciton (process) |
| DBMS | DataBase Management System |
| DBR | Distributed Bragg Reflector |
| DBRT | Double Barrier Resonant Tunneling |
| DBS | Direct Broadcast Satellite |
| DC | Direct Current; Dielectric Constant |
| DCA | Direct Chip Attachment |
| DCAS | Defense Contract Administration Service |
| DCATS | Double-Contained Acid Transfer System |
| DCC | Dynamic Channel Change |
| DCCF | Discounted Cumulative Cash Flow |
| DCD | DC Demagnitization (as opposed to AC) |
| DCE | Distributed Computer Environment |
| DCFL | Direct Coupled FET Logic |
| DCG | Domain Coordination Group |
| DCL | Digital Command Language; Display Communication Log |
| DCMA | Defense Contract Management Agency |
| DCMC | Defense Contract Management command |
| DCMI | Dublin Core Metadata Initiative |
| DCOM | Distributed Component Object Model |
| DCPAT | Dual CEPT Primary Access Transceiver |
| DCS | DiChloroSilane |
| DCX | Zsoft multipage Paintbrush image format |
| DD | Deformation Donor; Double Donor; Dislocation Density; Double Density |
| DDL | Device Description Language |
| DDMS | Defect Data Management System |
| DDR | Double Data Rate |
| DDS | Direct Digital Synthesis |
| deci | 1.00E-1 (1/10; symbolized by the prefix d) |
| DECT | Digital Enhanced Cordless Telephone |
| DEDS | Discrete Event Dynamic Simulation |
| DEG | Dimensional Electron Gas |
| deka | 1.00E+1 (10/1; symbolized by the prefix da) |
| DEMS | Digital Electronic Messaging Service |
| DEMUX | Demultiplexer |
| DES | Data Encryption Standard; Display Equipment Status |
| DESC | Defense Electronics Supply Center |
| DF | DarkField |
| DFB | Distributed FeedBack |
| DFESH | Design For Environment, Safety, and Health |
| DFLP | Design For Low Power |
| DFM | Design For Manufacturability |
| DFR | Design For Reliability |
| Density Functional Theory; Digital Fourier Transform; Design For Testability; Design |
| DFT | Density Functional Theory; Digital Fourier Transform; Design For Testability; Design For Test |
| DGF | Dynamic Gradient Freeze |
| DHBT | Double Heterostructure Bipolar Transistor |
| DHCP | Dynamic Host Configuration Protocol |
| DHF | Dilute Hydrofluoric Acid |
| DHTML | Dynamic HTML |
| DI | De-Ionized; Dielectric Isolation |
| D/I | Develop Inspect |
| DIB | Windows or OS/2 DIB image format |
| DIC | Differential Interference Contrast |
| DICE | DARPA Initiative in Concurrent Engineering |
| DIL | Dual InLine |
| DIM | Data Information Record |
| DIMM | Dual-In-Line Memory Module |
| DIN | Deutsches Institute fuer Normen (German standards institute) |
| DIP | Dual Inline Package |
| Dk | Dielectric constant |
| DLA | Defense Logistics Agency (DoD) |
| DLBI | Device Level Burn-In |
| DLC | Diamond-Like Carbon |
| DLD | Dark Line Defects |
| DLNC | Diamond-Like Nano-Composites |
| DLOC | Developed source Lines Of Code |
| DLS | Display Lot Status |
| DLT | Device Level Test |
| DLTS | Deep Level Transient Spectroscopy |
| DM | Defect Management |
| DMA | Direct Memory Access; Dynamic Mechanical Analysis |
| DMAC | Direct Memory Access Controller |
| DMH | Display Message Helps |
| DMIC | Digital Monolithic Integrated Circuit |
| DML | Data Manipulation Language; Display Message Log |
| DMM | Digital MultiMeter; Diffuse Mismatch Model |
| DMOS | Diffused Metal-Oxide Semiconductor |
| DMR | Display Move Requests |
| DMS | Data Management Standard; Diluted Magnetic Semiconductors; Dynamic Mechanical Spectroscopy |
| DMSA | Defense Manufacturers and Suppliers Association |
| DMTF | Distributed Management Task Force |
| DNC | Distributed Numerical Control; Direct Numerical Control |
| DNS | Direct Numerical Simulation; Domain Name System |
| DO | Dynamic optimization |
| DOA | Dead-On Alignment; Dead On Arrival |
| DOAS | Differential Optical Absorption Spectroscopy |
| DOCSIS | Data Over Cable Service Interface Specification |
| DoD | Department of Defense |
| DOD | Dissolved Oxygen Demand |
| DOE | Design Of Experiments |
| DOF | Depth Of Field; Depth Of Focus |
| DOI | Digital Object Identifier |
| DOM | Document Object Model |
| DOP | DiOctylPhthalate |
| DOS | Disk Operating System; Density Of States |
| DOTS | Digital-Optical Technology System |
| DPA | Displacement Per Atom; Destructive Physical Analysis |
| DPB | Double Positioning Boundary |
| DPDT | Double Pole, Double Throw (switch) |
| DPI | Dots Per Inch |
| DPI | Dots Per Inch |
| DPM | Digital Panel Meter |
| DPS | Display Process Status |
| DPSRAM | Dual-Port Static Random Access Memory |
| DPSSL | Diode-Pumped Solid State Lasers |
| DPST | Double Pole, Single Throw (switch) |
| DPT | Dynamic Packet Transport |
| DPW | Die Per Wafer |
| DR | Differential Reflectometry |
| DRAM | Dynamic Random Access Memory |
| DRAPAC | Design Rule and Process Architecture Council |
| DRC | Design Rule Check; Dynamic Range Control |
| DRE | Destruction Removal Efficiency |
| DRIFTS | Diffuse Reflectance Infrared Fourier Transform Spectroscopy |
| DRM | Drawing Requirements Manual; Digital Rights Management |
| DRPL | Digital Property Rights Language |
| DRT | Defect Review Tool |
| DRW | Micrografx Draw image format |
| DS | Double Sided (floppy disk) |
| DSA | Display System Activity; Digital Signature Algorithm |
| DSC | Differential Scanning Calorimetry |
| DSCP | Differentiated Services Code Point |
| DSD | Direct Stream Digitial |
| DSDP | Double Source Differential Photocapacitance |
| DSF | Dead Space Free |
| DSL | Digital Subscriber Line |
| DSMC | Direct Simulation Monte Carlo |
| DSM-CC | Digital Storage Media Command And Control |
| DSML | Directory Services Markup Language |
| DSP | Differential Signal Processing; Digital Signal Processing |
| DSQ | DownStream Quartz |
| DSR | Dynamic Shift Register |
| DSS | Display Stocker Status; Digital Signature Standard |
| DSU | Digital Service Unit |
| DSVD | Digital Simultaneous Voice and Data |
| DSW | Direct Step-on-Wafer |
| DT | Dynamic Test |
| DTA | Differential Thermal Analysis |
| DTC | Direct Thermocouple Control |
| DTCP | Digital Transmission Content Protection |
| DTD | Document Type Definition |
| DTH | Direct To Home |
| DTL | Diode Transistor Logic |
| DTM | Defect Test Monitor; Delay Time Multiplier; Device Test Module; Digital Terrain Map; Dynamic Synchronous Transfer Mode |
| DTMF | Dual Tone Multi-Frequency |
| DTMPN | Defect Test Monitor Phase Number |
| DTP | Diameter True Position |
| DTS | Digital Tuning System |
| DTTB | Digital Terrestrial Television Broadcasting |
| DTTV | Digital Terrestrial TV |
| DTV | Digital Television |
| DUART | Dual Universal Asynchronous Receiver Transmitter |
| DUF | Diffusion Under epitaxial Film |
| DUT | Device Under Test |
| DUV | Deep UltraViolet |
| DV | Design Verification |
| DVB-T | Digital Video Broadcasting – Terrestrial |
| DVD | Digital Video Disc; Digital Versatile Disc |