| Software Computer Co., Ltd | Bangkok |
| Software Park Phuket | Phuket |
| Software Park Thailand | Nonthaburi |
| Solomon Thailand | Nonthaburi |
| SomTamLabs | |
| Sone | Bangkok |
| Songkhla Rajabhat University | |
| Sony Thai Co., Ltd | Bangkok |
| SourceCode in Thailland | Bangkok |
| Southeasdt Asia Network Co., Ltd | Bangkok |
| Southeast Asia University | |
| Southeast Bangkok University | |
| Southern College of Technology | |
| Space-F | Bangkok |
| Spacely.AI | |
| SpaComputer | Bangkok |
| Spotwerkz Thailand | Bangkok |
| Srinakharinwirot University | |
| Sripatum University International College | |
| Stamford International University | |
| Standhost.com | Bangkok |
| Star PR | |
| Startup Thailand | Bangkok |
| Stream I.T. Consulting Ltd | Bangkok |
| Streaming Co., Ltd | Bangkok |
| Suan Dusit University | |
| Suan Sunandha Rajabhat University | |
| Sukhothai Thammathirat Open University | |
| Sundae | Bangkok |
| Sunday Ins Co., Ltd | Bangkok |
| SUPERNAP Thailand | Bangkok |
| Suranaree University of Technology | |
| Suranaree University of Technology School of Mathematics | Nakhon Ratchasima |
| Surathani Rajabhat University | |
| Surindra Rajabhat University | |
| Suzaku Productions Co., Ltd | |
| SVOA | Bangkok |
| Swiftlet | |
| Symphony Communication Public Co., Ltd | Bangkok |
| Syndacast | Bangkok |
| Syndome | Bangkok |
| Synnex | Bangkok |
| SYNsCON | Bangkok |
| Sys2u | Bangkok |
| T A Soft Co., Ltd | Bangkok |
| T&B Media Global (Thailand) Co., Ltd | |
| T-BOX (Thailand) Co., Ltd | |
| T-Sign Solution | Bangkok |
| T.H.NIC Co., Ltd | Bangkok |
| Tangerine Co., Ltd | Bangkok |