| Do Ingenia | Alpes-Maritimes |
| Dobeuliou | Bouches-du-Rhône |
| Docaposte | Moselle |
| Docaposte Fast | |
| Docline | Paris |
| Docndoc | |
| Docteur Micro | Paris |
| Docteur Ordinateur S.A.R.L. | Paris |
| Doctolib | |
| Doctor Web France | |
| Doctrine | |
| Documalis Express | Loire-Atlantique |
| Doers | |
| Dogami | |
| Doing | Loire |
| Doinsport | |
| DojoGroup | Paris |
| DolceVista | |
| Dole Solus Informatique | Jura |
| Dolead | Paris |
| DOLFI | Val-d'Oise |
| Doliam | |
| DoliCloud | |
| Dolist.net | Gironde |
| Dolmen | |
| Dolphin Design S.A.S. | |
| DOM Informatique | Rhône |
| Domadoo S.A.S. | Métropole de Lyon |
| Domain Therapeutics | |
| Domaine Des Noms | Var |
| Domaine.fr | Alpes-Maritimes |
| Domainium | Haute-Savoie |
| Domainoo.com S.A.S. | Paris |
| DomRaider | Puy-de-Dôme |
| DomWest | Loire-Atlantique |
| DONOS Conseil | |
| Dontnod Entertainment | Paris |
| Dood | |
| DooHit | |
| Doptim | |
| Doranco | Paris |
| Dorima | |
| Dot Technologie | |
| Dotfile | |
| DotRiver | Métropole de Lyon |
| Dotsafe | Gironde |
| DotVision | Seine-et-Marne |
| DotVision S.A.S. | Seine-et-Marne |
| Doubango Telecom | |
| DoubleTrade | Hauts-de-Seine |