| Tencent (Thailand) Co., Ltd | Bangkok |
| Terabyte Plus Public Co., Ltd | Bangkok |
| Terrabit Co., Ltd | Bangkok |
| TH Web Space | Bangkok |
| Thai Credit Bank | Bangkok |
| Thai e-Commerce Association | Bangkok |
| Thai Fintech Association | Bangkok |
| Thai SCADA Co., Ltd | Bangkok |
| Thai Webmaster Association | Bangkok |
| Thai Wonderful Wire Cable Co., Ltd | Chonburi |
| Thai-Domain.com | Bangkok |
| Thai-Nichi Institute of Technology | |
| Thai-Server.com | Bangkok |
| Thaicom Public Co., Ltd | Bangkok |
| ThaiCyberGames | Bangkok |
| ThaiDhost | Bangkok |
| ThaiDomainHosting.com | Bangkok |
| Thaidreamhost | Bangkok |
| ThaiEasyHost.com | Bangkok |
| Thaiger Dot Net Co., Ltd | Bangkok |
| Thaihosting Communication Co., Ltd | Bangkok |
| ThaiHostServe | Bangkok |
| ThaiHostUnlimited | Bangkok |
| Thailand Board of Investment | Bangkok |
| Thailand Science Park | Pathum Thani |
| ThaiNetDesign.Net | Bangkok |
| ThaiOpenSource.org | Bangkok |
| ThaiQuest | Bangkok |
| thairegister | Bangkok |
| Thaisite.net | Bangkok |
| ThaiWebHost | Bangkok |
| ThaiWebpro.com | Bangkok |
| ThaiZone | Bangkok |
| Thammasat University - Department of Computer Science | Bangkok |
| The Far Eastern University | |
| The Hive Thonglor Bangkok | Bangkok |
| theBoy.in.th | Bangkok |
| Think Blue Data Co., Ltd | Nonthaburi |
| Thongsook College | |
| Throughwave (Thailand) Co., Ltd | Bangkok |
| TIME Consulting Co., Ltd | Bangkok |
| TISCO Bank Public Co., Ltd | |
| TMBThanachart Bank Public Co., Ltd | Bangkok |
| TMD Space Co., Ltd | Bangkok |
| TNT Media and Network Co., Ltd | Bangkok |
| Transcosmos Thailand | Bangkok |
| True Corporation Public Co., Ltd | Bangkok |
| True Internet | Bangkok |
| TTB Bank | |
| TukTukDomain.com | Bangkok |