| Corecell Technology Co., Ltd | Bangkok |
| Craftpix | Surat Thani |
| Crea Co., Ltd | |
| CreationThai | Bangkok |
| Creatus Corporation Ltd | Bangkok |
| Crème Academy | |
| Criclabs | |
| CSL | Bangkok |
| CSME Marketing | |
| CSmileDev | Bangkok |
| Cybersec Asia | Bangkok |
| Cybertron Co., Ltd | Bangkok |
| D.T.C. Enterprise Public Company Ltd | Bangkok |
| Data Design Solutions Thailand Co., Ltd | Bangkok |
| Data Farm Co., Ltd | Bangkok |
| Data In Motion Co., Ltd | Bangkok |
| Data Wow Co., Ltd | Bangkok |
| DataGrid Co., Ltd | Bangkok |
| DataOne Asia (Thailand) Co., Ltd | Bangkok |
| Datatel | Bangkok |
| dbQwikSite | Bangkok |
| Debuz Co., Ltd | Bangkok |
| DeeMoney | Bangkok |
| Deeple Co., Ltd | Bangkok |
| Deepscope | Bangkok |
| Deeserver | Bangkok |
| Demeter ICT | Bangkok |
| Designally Co., Ltd | |
| Dev X (Thailand) Co., Ltd | |
| Deverhood HT | Bangkok |
| Dhurakij Pundit University | |
| Digio (Thailand) Co., Ltd | Bangkok |
| digital Age Magazine | Bangkok |
| Digital Base | Bangkok |
| Digital Broker Ventures | Phuket |
| Digital Metrix | Bangkok |
| Digital Search Group Co., Ltd | |
| Digitalmedia Outsource Solution Co., Ltd | Nonthaburi |
| Digitopolis Studio | |
| Digix Technology Co., Ltd | Khon Kaen |
| DINSOW | Bangkok |
| Ditgital Design Automation Co., Ltd | Bangkok |
| Divertise Asia Co., Ltd | Bangkok |
| Dochost | Bangkok |
| Dotarai | Bangkok |
| Dragon Hispeed Co., Ltd | Bangkok |
| DriteStudio Co., Ltd | Samut Sakhon |
| Drupal Thailand | Bangkok |
| DTAC | Bangkok |
| Dusit Thani College | |