| Dr. Netik GmbH | Baden-Württemberg |
| Dr. Rack Consulting GmbH | North Rhine-Westphalia |
| Dr. Sander GmbH | North Rhine-Westphalia |
| Dr. šonje webconsult GmbH | Baden-Württemberg |
| Dr.-Ing. Stefan Schwarzer | Hesse |
| Dr.-Ing. Thomas Kühn Software Engineering Services | Hesse |
| Dr.DOC GmbH | Bavaria |
| Dr.Web | Baden-Württemberg |
| Drag and Bot GmbH | |
| Dräger Electronic & Audio GmbH | Baden-Württemberg |
| DRAGO Automation GmbH | Berlin |
| Draw.io | |
| DrawerJS | Rhineland-Palatinate |
| Dredesign.de | Hesse |
| Dreger IT GmbH | Hesse |
| DrehPunkt GmbH | Mecklenburg-Vorpommern |
| Drela GmbH | Hesse |
| Dresden Elektronik Ingenieurtechnik GmbH | Saxony |
| Dresden Informatik GmbH | Saxony |
| Dresden International University | |
| DResearch Digital Media Systems GmbH | Berlin |
| DResearch Fahrzeugelektronik GmbH | |
| Drews Electronic GmbH | North Rhine-Westphalia |
| drews informatik | |
| DRG Deutsche Realitäten GmbH | |
| DRIS Deutsche Renten Information Services GmbH | |
| dritte-etage | Lower Saxony |
| driveblocks GmbH | |
| DriverLab | Baden-Württemberg |
| Drone Industry Insights | Hamburg |
| Drooms | |
| DropFriends GmbH | |
| drSoniX Webdesign | Hesse |
| druckerfachmann.de | Berlin |
| Druckertinte.de GmbH | Schleswig-Holstein |
| druckerzwerge-shop.de | Bavaria |
| Drupal e.V. | North Rhine-Westphalia |
| DrupalCenter.de | North Rhine-Westphalia |
| Dryad Networks GmbH | |
| DS Deutsche Systemhaus GmbH | Bavaria |
| DS Digitale Seiten | |
| DS Vida GmbH & Co. KG | |
| dsb it services GmbH | |
| DSC GmbH | North Rhine-Westphalia |
| DSC pro system | Bavaria |
| DSC Schönrath Computersysteme | North Rhine-Westphalia |
| DSC Software AG | Baden-Württemberg |
| DSD Data Service Damm GmbH | Bavaria |
| dsgn.de | Hesse |
| DSHG Deutsche Software systemHaus AG | Berlin |