| Abbreviation | Definition |
|---|---|
| DAV | Deerlick Astronomy Village |
| DCT | Discrete Cosine Transform |
| DDA | Division on Dynamical Astronomy |
| DDAS | Derby and District Astronomical Society |
| DE | Dwarf Elliptical |
| DEcam | Dark Energy Camera |
| DES | Dark Energy Survey |
| DHI | Diffuse Horizontal Irradiation |
| DIB | Diffuse Interstellar Band |
| DIG | Dwarf Irregular Galaxy |
| DIN | Day Into Night |
| DIN | Deutsches Institut für Normung |
| DISCO | Domestic International Satellite Consolidation Order |
| DIST | DISTance |
| DLR | Deutschen Zentrum für Luft- und Raumfahrt |
| DM | Dark Matter |
| DNI | Direct Normal Irradiance |
| DOS | Dark Object Subtraction |
| DOS | Degrees Of Separation |
| DPAC | Double Path Auto-Collimation |