| Oracle Thailand | Bangkok |
| Orange Technology Solution Co., Ltd | |
| ORDIS Co., Ltd | |
| Oriental Motor (Thailand) Co., Ltd | |
| Outsourcify | Bangkok |
| P&T Hosting | Bangkok |
| Panyapiwat Institute of Management | |
| Paocloud Co., Ltd | Chumphon |
| Paper & Page (Thailand) Co., Ltd | |
| Pathumwan Institute of Technology | |
| PattayaMedia.com | Bangkok |
| Pay Solutions Asia | Bangkok |
| Payap University | |
| Phanomwan College of Technology | |
| Phetchabun Rajabhat University | |
| Phetchabury Rajabhat University | |
| Phoenix Media | Bangkok |
| Phramongkutklao College of Medicine | |
| Phranakhon Rajabhat University | |
| Phranakornsoft Co., Ltd | Bangkok |
| Phuket Rajabhat University | |
| Phuket Solution Co., Ltd | Phuket |
| Pibulsongkram Rajabhat University | |
| Pichaya Solutions Co., Ltd | Bangkok |
| Picohosting | Bangkok |
| Piesoft Co., Ltd | Bangkok |
| Pixel Planet Design Co., Ltd | Bangkok |
| Placeworks Co., Ltd | |
| Planet Communications Asia plc | |
| Plusma Infotech Co., Ltd | Bangkok |
| Pohang University of Science and Technology | |
| Poise Technology Co., Ltd | Bangkok |
| Police Nursing College | |
| Porar | Bangkok |
| Postech Group International Co., Ltd | Bangkok |
| POSware | Bangkok |
| Powell Computer Manufacturing Co., Ltd | Bangkok |
| PowerGREP | Phuket |
| Praboromarajchanok Institute | |
| Predictive Co., Ltd | Bangkok |
| Premier Technology plc | Bangkok |
| Primo World Co., Ltd | Bangkok |
| Prince of Songkla University | |
| Princess of Naradhiwas University | |
| Proactive Marketing Solutions Co., Ltd | Chonburi |
| PROEN Corporation Public Co., Ltd | Bangkok |
| Prompt Design | Bangkok |
| Pronto Marketing | |
| Prosoft Creative | Bangkok |
| Proteus Group | Bangkok |