| DBF Solutions GmbH | Baden-Württemberg |
| dbh Logistics IT AG | Bremen |
| dblp | |
| dblp Computer Science Bibliography | |
| Dbsc Ruban GmbH | Baden-Württemberg |
| DbSchema | |
| DBW Werbeagentur GmbH | North Rhine-Westphalia |
| DC-Software Doster Christmann GmbH | Bavaria |
| dc-systeme Informatik GmbH | |
| DCC Global GmbH | Lower Saxony |
| DCC.RUHR | |
| DCD GmbH Computerentwicklung | |
| DCE Computer Service GmbH | North Rhine-Westphalia |
| DCM Digital Claim Management GmbH | |
| DCMN | |
| DCMN GmbH | |
| DCom Systems KG | |
| DCS Netzwerktechnik GmbH | North Rhine-Westphalia |
| DCT Delta AG | |
| DD Handelsgesellschaft mbH | Schleswig-Holstein |
| DD NetService | Lower Saxony |
| dd-media.de | Hesse |
| DdD Retail Germany GmbH | Baden-Württemberg |
| DDG AG | |
| DDS DäggelmannSysteme GmbH | Baden-Württemberg |
| de burna.com | North Rhine-Westphalia |
| De Causmaecker GmbH | |
| DE Software & Control GmbH | Bavaria |
| de-bit Computer-Service GmbH | |
| DE-CIX Management GmbH | North Rhine-Westphalia |
| Dealcode GmbH | |
| Dealfront Group GmbH | |
| Deaxo GmbH | |
| Debilsoft Software Engineering | Rhineland-Palatinate |
| DeBIT Elektronik Bauelemente Vertriebs GmbH | North Rhine-Westphalia |
| Deborate GmbH | Bavaria |
| DEBUS TK-Service GmbH | Bavaria |
| Deca Live Operations GmbH | |
| DECAF GmbH & Co. KG | North Rhine-Westphalia |
| Decision-Computer Jürgen Merz e.K. | North Rhine-Westphalia |
| Deckard.AI GmbH | |
| Deckarm AG | Saarland |
| Decodon Software UG (haftungsbeschränkt) | Mecklenburg-Vorpommern |
| Decon | Hamburg |
| Decondia | |
| DeCoSeo GmbH | |
| Dectel International GmbH | Baden-Württemberg |
| DeDeNet GmbH | |
| Deep Content GbR | |
| Deep Digital | |