| Chaopraya University | |
| Chiang Mai University | |
| Chiang Mai University - Department of Mathematics | Chiang Mai |
| Chiangrai College | |
| Chulalongkorn University | Bangkok |
| Chulalongkorn University - Department of Computer Engineering | Bangkok |
| Chulalongkorn University - Department of Mathematics | Bangkok |
| Clicksee Network | Bangkok |
| ClickseeDesign | Bangkok |
| Clockwork Media Co., Ltd | Bangkok |
| Cloud HM Co., Ltd | Bangkok |
| CloudCommerce | Bangkok |
| CMKL University | Bangkok |
| Code Gears Co., Ltd | Bangkok |
| Coins.co.th | Bangkok |
| ColorPack Creations Co., Ltd | Bangkok |
| Com7 International Co., Ltd | Bangkok |
| Comp Trading Co., Ltd | Bangkok |
| Computer Union Co., Ltd | Bangkok |
| Computer Union Co., Ltd | Bangkok |
| Computerlogy Co., Ltd | Bangkok |
| ComSeven | Bangkok |
| Corecell Technology Co., Ltd | Bangkok |
| Craftpix | Surat Thani |
| CreationThai | Bangkok |
| Creatus Corporation Ltd | Bangkok |
| Crème Academy | |
| CSL | Bangkok |
| CSME Marketing | |
| CSmileDev | Bangkok |
| Cybersec Asia | Bangkok |
| Cybertron Co., 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 |
| Deverhood HT | Bangkok |
| Dhurakij Pundit University | |
| Digio (Thailand) Co., Ltd | Bangkok |
| digital Age Magazine | Bangkok |